WBSO glossary

Key terms around the WBSO and Dutch innovation subsidies, clearly explained.

Looking for the meaning of a WBSO term? This glossary explains the most important terms around the WBSO and innovation subsidies in the Netherlands.

Advance payment: An advance payment is an upfront payment of part of a granted subsidy, which you receive before the funding body makes the final determination. Advances are especially common for subsidies that reimburse costs afterwards based on a final report: by paying out part of the amount in advance, the company gets working capital to carry out the project without having to pre-finance the full costs itself. Not every scheme offers advances, and the way an advance is determined and paid out varies considerably by scheme and funding body. For the WBSO this concept does not play the same role: the benefit for companies with staff runs through a reduction on the payroll tax due during the application period itself, and sole traders receive their benefit via the income tax return. There is therefore no separate advance payment needed, because the benefit is already settled upfront rather than paid out afterwards. For project subsidies that do use advances, the definitive amount is usually only fixed after the final determination, based on the final report on the costs actually incurred and the results achieved. You may have to repay an advance you received in excess once the final determination is made.
Application period: The application period is the consecutive stretch of time for which you apply for WBSO, and over which RVO grants the approved R&D hours and tax benefit. For companies with staff, a period runs for a minimum of 3 and a maximum of 12 calendar months, and consecutive application periods may not overlap — so you cannot claim benefit twice over the same month. You may submit at most three applications per calendar year, for example spread across quarters, but many companies choose the simplest route: a single annual application covering the whole calendar year, submitted before 30 September of the preceding year. That choice also determines your administrative workload: with one annual application you file a realisation report only once a year, whereas several shorter periods mean reporting more often but also allow you to adjust sooner if actual hours diverge from the estimate. The application period is closely tied to the decision (beschikking): each period gets its own S&O declaration, and after each period ends you report the realised hours and costs via mijn.rvo.nl. For an ongoing project that runs over several years, you therefore apply for one or more application periods again every calendar year.
BSN (citizen service number): The citizen service number (BSN) is the unique personal number the Dutch government uses to identify individuals, similar to the number on your passport or ID card. For a WBSO application by a company with staff, you provide the BSNs of the employees who carried out the research and development (R&D) work. RVO uses this data, combined with the payroll tax return filed with the Dutch Tax Administration, to determine those employees' average R&D hourly wage — one of the building blocks of the R&D base over which the WBSO benefit is calculated. Without correct BSNs, RVO cannot link this hourly wage to your payroll administration, which can cause delays or an incorrect determination of your benefit. Sole traders who claim the WBSO via the self-employed deduction generally do not provide third-party BSNs, because that deduction is based on the hours criterion rather than on an R&D hourly wage for employees. Because the BSN is a sensitive personal data item, you handle it carefully within your hour administration and application file, in line with the GDPR. If an adviser or platform prepares your WBSO application on your behalf, it is common for them to process the BSNs of your R&D staff to submit the application correctly.
Chain authorisation (ketenmachtiging): A chain authorisation (ketenmachtiging) is a digital power of attorney within eHerkenning that lets you give an intermediary — for example an accountant, tax adviser, or a platform that guides WBSO applications — permission to act on behalf of your company with government services, without having to share your own login credentials. You arrange the authorisation through your eHerkenning supplier, which acts as the intermediate party (the 'chain' in chain authorisation) passing your company's authority on to the intermediary; the authorisation is valid for a maximum of five years and can be revoked earlier. In practice, this means your adviser can submit an application on mijn.rvo.nl on your behalf, view the decision, and handle the realisation report, while you remain the sole owner of your own eHerkenning or DigiD. This is especially useful for companies that outsource their entire WBSO process: without a chain authorisation, the adviser would need access to your personal login method, which is undesirable from a security standpoint. For most entrepreneurs, the chain authorisation is a one-time step arranged when setting up the collaboration with an adviser, after which the annual WBSO cycle can run without further intervention.
Co-financing: Co-financing (cofinanciering) is the share of a subsidised project's costs that a company must fund itself, alongside the subsidy it receives. Almost no Dutch subsidy scheme covers 100% of project costs; instead, each scheme sets a subsidy rate — for example 60% for SLIM or 35% for a MIT feasibility project — and the remaining share is the applicant's own contribution. This design serves two purposes: it keeps the applicant financially invested in the project's success, and it helps schemes stay within the state aid limits that cap the aid intensity — the percentage of costs that may be publicly funded — for a given category of aid. Co-financing does not have to come entirely from the company's own cash reserves; depending on the scheme, it can also take the form of financing arranged through a bank, an investor, or, in project consortia, contributions and co-financing letters from partner organisations. When budgeting a subsidy application, it is worth calculating the co-financing requirement early, since underestimating it is a common reason why otherwise well-prepared applications run into funding problems later in the project. Because the required percentage varies by scheme and sometimes by activity within a scheme, always check the specific subsidy rate that applies before assuming a standard co-financing share.
Costs and expenditure (WBSO): Costs and expenditure (kosten en uitgaven) is the WBSO term for the non-wage costs of an R&D project that companies with staff can add to their S&O wage base alongside the wage costs of employees doing research and development work. Typical examples include materials and consumables used in experiments or prototyping, and the purchase of capital assets (bedrijfsmiddelen) specifically needed for the R&D project. Including these costs matters because they enlarge the S&O wage base on which the WBSO benefit is calculated, which makes the scheme particularly attractive for capital-intensive development work, such as building a custom prototype machine or scaling up a production process. When applying, you choose between two ways of accounting for these costs: reporting the actual costs and expenditure, with full supporting documentation, or applying a flat rate (forfait) per R&D hour instead, which spares you from administering each cost item separately. This choice is made per calendar year and applies to the whole project — you cannot mix actual costs and the flat rate within the same year. Whichever option you choose, your administration of costs and expenditure needs to be complete and up to date by the time you submit your year-end realisation report, since RVO can request supporting evidence during an audit.
De-minimis aid: De-minimis aid is a category of state aid considered too limited to distort competition within the EU internal market, and is therefore exempt from the obligation to notify the European Commission that otherwise applies to state aid. A maximum amount applies per enterprise over a rolling period, and if a company receives aid from several de-minimis schemes, the amounts are added together and may not exceed that ceiling. Many smaller Dutch subsidy schemes fall under the de-minimis rules, including SIB and SLIM; when applying for these, you must submit a de-minimis declaration listing aid received earlier. This matters for subsidy planning: if you combine multiple de-minimis-based schemes within the same period, you need to track the cumulative aid carefully to avoid exceeding the ceiling and having to repay part of it. Not every scheme works this way, though — the WBSO and the innovation box, for instance, are tax schemes rather than subsidies and do not fall under the de-minimis rules, so they sit outside this accounting. Understanding whether a scheme is de-minimis-based is therefore an important first step before combining several subsidies, alongside checking whether a scheme instead relies on another state aid exemption such as the General Block Exemption Regulation (GBER).
Decision (beschikking): A decision (beschikking) is the formal, written ruling that an administrative body such as RVO issues on a submitted application, carrying legal effect for the applicant. For the WBSO, this decision is called the S&O declaration: the document in which RVO records how many R&D hours — and, where applicable, which costs and expenditure — have been approved, and what tax benefit follows from that. The decision comes after RVO assesses your application for a specific application period, and it forms the legal basis on which you may apply the reduction to your payroll tax or, as a sole trader, claim the deduction in income tax. If you disagree with the decision — for example because fewer hours were granted than requested — you can file an objection within six weeks of the date of the decision. An objection stands or falls on strong technical substantiation: you need to explain concretely why the work is technically new and which technical uncertainty you had to resolve. In practice, an objection isn't always the fastest route; it is often more effective to sharpen the project description and submit a new application for the remaining period instead. The decision is therefore not just an administrative endpoint but the starting point of your accountability: the hours and costs it states are what you later compare against your actual realisation.
DigiD: DigiD is the digital login tool individuals and sole traders use to identify themselves to the Dutch government, tied to their citizen service number (BSN). For the WBSO, DigiD matters because sole traders without staff can use it to log in to mijn.rvo.nl, submit an application themselves, view the decision, and report their realisation — the same steps companies with staff carry out via eHerkenning level EH3. The difference lies in the target group and the cost: DigiD is free and works immediately, while eHerkenning is issued by accredited private suppliers and level EH3 typically carries an annual fee. Once a company takes on staff or converts into a legal entity such as a BV, DigiD is no longer sufficient and eHerkenning becomes mandatory. Many founders therefore start with DigiD and only switch to eHerkenning once the company grows. For RVO, the login method itself makes no difference to the substantive assessment of a WBSO application — it only determines who gets access to the portal on behalf of which company. DigiD is thus mainly a practical threshold kept low for sole traders, so administrative burden does not stand in the way of access to the WBSO.
eHerkenning: eHerkenning is the digital login method companies and other organisations use to identify themselves to government portals, comparable to DigiD for individuals. To access mijn.rvo.nl and submit a WBSO application you need at least level eH3, with a specific authorisation for the WBSO service; a lower level such as eH2 does not grant access. Legal entities such as a bv, nv or foundation are required to use eHerkenning. Sole traders with a one-person business can choose between free DigiD, which works immediately based on your BSN, or eHerkenning eH3, which becomes more common once you take on staff. You apply for eHerkenning through a recognised supplier, via an identity check based on your Chamber of Commerce (KvK) extract. If you want an accountant, adviser or a platform such as Manna to submit a WBSO application on behalf of your company, you arrange that through an additional eHerkenning authorisation for the WBSO service, rather than sharing your own login credentials. Without the right eHerkenning level and authorisation, you cannot handle a WBSO application, realisation report, or any other RVO service via mijn.rvo.nl.
eLoket (RVO): The eLoket is RVO's digital environment in which entrepreneurs submit, track and manage certain subsidy applications. For access you log in with eHerkenning (for companies and other legal entities) or DigiD (for sole traders) — the same login means used for mijn.rvo.nl. The eLoket is not the same portal as mijn.rvo.nl: while the WBSO application, the S&O declaration and the realisation report run through mijn.rvo.nl, RVO uses a separate digital desk for part of its other subsidies and schemes. Which desk you need depends on the scheme you are applying for; RVO indicates this per scheme on the relevant information page. Make sure your authorisations are in order before you apply: if an adviser or accountant applies on behalf of your company, arrange this via an eHerkenning authorisation or a chain authorisation, so that person gets access to the right desk without you having to share your own login credentials. As with mijn.rvo.nl, start arranging your login means in good time, since requesting eHerkenning from an accredited provider takes some lead time. Make sure your access to the right RVO desk is arranged before an application period or opening begins.
Eurostars: Eurostars is part of the Eureka network and funds international, market-oriented R&D collaboration by innovative SMEs with partners — other SMEs, larger companies and/or knowledge institutions — from other participating countries. For Dutch participants, fixed subsidy rates apply to the eligible project costs: 50% for SMEs and knowledge institutions, and 40% for large companies and other participants, with a maximum of €500,000 in subsidy per project for the Dutch project share. The Dutch Ministry of Economic Affairs makes €22 million available each year for the Dutch share, split over two calls per year. The application procedure runs in two steps: first the international consortium submits a joint application to the Eureka secretariat, and only after approval by the international jury does the national subsidy application follow with RVO — Dutch participation requires at least one Dutch company in the consortium. Eurostars does not exclude the WBSO: the WBSO lowers your Dutch R&D wage costs, while Eurostars funds a specific cross-border project. Many innovative companies use the WBSO as their tax foundation and deploy Eurostars once their development gains an international collaboration component, as long as the same costs aren't funded twice.
Experimental development: Experimental development is the second European-defined research category within R&D aid, alongside industrial research. It involves acquiring and combining existing scientific, technological, business and other relevant knowledge and skills, with the aim of developing new or improved products, processes or services. Think of building and testing prototypes, demonstrations, pilot projects, or trial processes in an environment that approximates real-world practice. Experimental development sits closer to the market than industrial research: it does not primarily gather new knowledge, but applies existing knowledge to arrive at a working result. Many schemes group both categories together and cap them jointly. Under the MIT North Holland Feasibility Project, for example, industrial research and experimental development combined may make up at most 40% of project costs, while the remainder (at least 60%) must go to the feasibility study itself. For the WBSO this European split is not the basis for assessment: that scheme instead tests for technical novelty and technical uncertainty, distinguishing technical-scientific research from the development of software, products or processes. Understanding the distinction between industrial research and experimental development helps explain why some subsidies apply different aid percentages or cost ratios per category.
Feasibility study: A feasibility study maps the technical and economic feasibility of a planned innovation before a company invests at scale in development. You investigate, for example, whether an idea is technically achievable, what the risks are, and whether there is a viable business case behind it. A feasibility study forms the core of a MIT feasibility project, a regionally or nationally administered part of the MIT scheme. The MIT North Holland Feasibility Project 2026, for instance, consists mainly of a feasibility study, requiring at least 60% of the eligible costs to go to the study itself and at most 40% to limited additional industrial research or experimental development. Under that scheme, the province reimburses 35% of the eligible costs, with a maximum subsidy of €20,000 and a minimum subsidy of €5,000; the decision period is 16 weeks after receipt of the application. A feasibility study is attractive because it lets you test, at relatively limited risk, whether an idea is worth pursuing before moving to a larger, more expensive development track — often financed via the WBSO or another instrument within the MIT scheme. Note: the amounts, percentages and conditions of feasibility projects vary by region and year, so always check the current conditions of the administering province or RVO.
Final determination: The final determination is the formal decision by which a funding body sets the definitive amount of a subsidy. This usually happens after the subsidised project has been completed and the recipient has submitted a final report with the costs actually incurred and the results achieved. Until the moment of final determination, the granted amount — set out in the earlier decision — remains provisional: if an advance was paid, it can be adjusted upward or downward at final determination, depending on what was actually realised. If the realisation deviates significantly from the application, the funding body can set the amount lower or even reclaim it in full. For the WBSO this works slightly differently: instead of a separate determination procedure after a final report, you submit a realisation report after the calendar year ends stating the R&D hours actually spent, after which RVO — if necessary — issues a correction decision that adjusts the definitive benefit to the actual hours. The principle is similar: only after this step is the final benefit fixed. Companies should therefore keep good records throughout the project, so that the final report or realisation report is accurate and the final determination proceeds without surprises.
Final report: The final report is the account you submit to the funding body after a subsidised project ends, describing the results achieved and the costs actually incurred relative to what was stated in the original application. Based on this report, the funding body assesses whether the project was carried out as described and makes the final determination of the subsidy — possibly with a correction relative to an advance paid earlier. What exactly a final report must contain varies by scheme: it typically includes a substantive review of the project results, a financial account of the costs incurred, and sometimes supporting documents such as invoices or test results. The WBSO has no separate 'final report' in this form; instead, after the calendar year ends you submit a realisation report with the R&D hours actually spent and any costs and expenditure, which functions similarly as the basis for the final determination of your benefit. For project subsidies such as a MIT feasibility project, a careful final report is essential: if the report does not match the previously approved application, you risk the funding body setting the subsidy lower than the granted amount. Make sure you gather evidence throughout the project — progress reports, results and cost overviews — so the final report can be prepared smoothly.
Flat rate (WBSO): The flat rate (forfait) is a simplified way of accounting for the costs and expenditure of a WBSO project: instead of tracking and documenting every individual cost item, you apply a fixed surcharge of €10 per R&D hour on top of your wage costs. This flat rate is meant to cover costs and expenditure such as materials or small tools used during research and development, without the administrative burden of itemising each expense. The alternative is reporting the actual costs and expenditure, supported by full documentation — an approach that tends to pay off when a project's real material or equipment costs clearly exceed what the flat rate would produce, for example in capital-intensive manufacturing or biotech development. You must choose one of the two options per calendar year, and you cannot switch between the flat rate and actual costs within the same project year — mixing them is one of the more common mistakes companies make when calculating their WBSO benefit. Whichever option you pick becomes part of your S&O wage base, alongside your R&D wage costs, and is settled through the same payroll tax reduction or, for sole traders, the same fixed deduction. Choosing correctly between the flat rate and actual costs is therefore a small but consequential decision that is worth revisiting each year as your project's cost structure changes.
GBER (General Block Exemption Regulation): The GBER (General Block Exemption Regulation), known in Dutch as the AGVV (Algemene Groepsvrijstellingsverordening), is a European regulation that allows member states to grant certain categories of state aid without first notifying the European Commission, provided the aid meets the conditions set out in the regulation. It exists to reduce administrative burden for both member states and the Commission: rather than reviewing every individual aid measure case by case, the Commission has pre-approved broad categories — such as aid for research, development and innovation, training, environmental protection, and support for SMEs — as long as the aid stays within defined limits on aid intensity and eligible costs. Many Dutch innovation and R&D subsidies are granted under the GBER rather than the de-minimis rule, which matters because the two exemptions work differently: de-minimis caps the total aid an enterprise may receive over a rolling period regardless of the project, while the GBER instead attaches conditions to the specific aid measure and project, such as maximum aid intensities as a percentage of eligible costs. For applicants, what matters most is which exemption a specific scheme falls under, since that determines which conditions, declarations and aid ceilings apply — information you can find in the scheme's own conditions or with RVO.
Hour administration (WBSO): The hour administration is the mandatory record of hours spent on research and development (R&D/S&O) work, logged per person, per project and per day. Once your WBSO application is granted, you must demonstrate that the hours on which the benefit is based — an estimate made at the time of application — were actually worked. RVO expects you to record at least the date, the employee, the approved project, the number of R&D hours and a brief description of the work, supplemented with supporting documents such as reports, designs or test results that show progress. Only genuine R&D hours count; meetings about planning, administration or commercial tasks do not. The hour administration forms the basis for the realisation report you submit to RVO after the calendar year ends — although sole traders who spent more than 500 R&D hours are exempt from this. If your hour administration is inaccurate or you cannot substantiate the hours, you miss out on WBSO benefit or risk a correction during an RVO audit. It is therefore best to record your hours daily, or shortly after the work is done: reconstructing them afterwards is error-prone and hard to substantiate during an audit.
Hours criterion: Within the WBSO, the hours criterion is the requirement that a sole trader spends at least 500 R&D hours per calendar year on research and development work to qualify for the R&D deduction in income tax. Unlike employers, who receive the WBSO benefit as a reduction on the payroll tax due over a calculated R&D base, sole traders who meet this hours criterion receive a fixed deduction instead of a base calculation. This deduction lowers taxable profit in income tax and is therefore independent of the exact R&D hourly wage or costs incurred. To demonstrate that you meet the hours criterion, you must keep proper hour records showing, per day and per project, how much time you spent on qualifying R&D — only hours spent on work that meets the requirements of technical novelty and technical uncertainty count. If you fall short of the 500 hours, the right to the R&D deduction lapses for that year, even if you did hold an S&O declaration. The hours criterion is therefore a separate, additional condition that applies specifically to sole traders, on top of the S&O declaration itself.
Industrial research: Industrial research is a European-defined research category: planned or critical research aimed at acquiring new knowledge and skills, with a view to developing new products, processes or services, or a significant improvement of them. It differs from experimental development in that its outcome is still further from the market: knowledge is gathered, but not necessarily yet built into a concrete, market-ready product. The category recurs across many European and Dutch R&D subsidies alongside experimental development, often with different maximum aid percentages or mandatory ratios between the two. Under the MIT North Holland Feasibility Project, for instance, industrial research and experimental development combined may account for at most 40% of project costs, while at least 60% must go to the feasibility study itself. Schemes outside the MIT also fund industrial research specifically: the MKB High-Tech call run by Holland High Tech, for example, made a total budget of €5 million available for industrial research into key technologies by SMEs. For the WBSO this classification is less relevant: that scheme uses its own categories — technical-scientific research and the development of software, products or processes — rather than the European split between industrial research and experimental development.
Innovation box: The innovation box is a scheme within corporate income tax (vpb) under which profit attributable to innovative activities is taxed at a reduced rate of 9%, instead of the regular corporate tax rate. Where the WBSO lowers wage costs during the development of an innovation, the innovation box applies once that innovation starts generating profit — together, the two schemes cover the entire life cycle of an R&D project. To apply the innovation box, you need an entry ticket: for most SMEs, that is an S&O declaration (WBSO) for the intangible asset in which the innovation is embodied. Larger companies often need an additional ticket alongside the S&O declaration, such as a patent. The WBSO is therefore valuable not only in its own right but also as the key to the innovation box. Because determining which share of profit is attributable to the innovation is complex, this is usually established together with an accountant or tax adviser, often in consultation with the Tax Administration. The innovation box is particularly relevant for companies with profitable products or software that stem from their own qualifying R&D work. Without a valid S&O declaration as a basis, access to the innovation box is not possible for most companies.
Innovation Credit: The Innovation Credit is an RVO financing scheme that lets companies obtain a loan for developing promising but high-risk new products, processes or services. The fundamental difference from the WBSO lies in the nature of the benefit: the WBSO is a tax scheme that lowers your wage costs through a reduction on payroll tax or a deduction in income tax, whereas the Innovation Credit is repayable financing — there is no lasting tax benefit, but funding your company eventually pays back. The instrument is meant for the phase in which the technical feasibility of an innovation is not yet established and regular financiers, such as banks, are reluctant because of the risk involved. The Innovation Credit is separate from the WBSO, but the two schemes can complement each other well within the same development trajectory: the WBSO lowers the ongoing wage costs of your R&D work, while the Innovation Credit funds the broader development investment. Combining it with the WBSO and other schemes such as the MIT is possible, as long as you don't claim the same hours or costs twice across different schemes. For companies that need capital, not just tax benefit, to actually bring an innovation to market, the Innovation Credit is therefore a logical complement to the WBSO.
KvK (Chamber of Commerce): KvK stands for Kamer van Koophandel, the Dutch Chamber of Commerce, which maintains the Handelsregister (trade register) in which every Dutch business — from sole traders to multinationals — must be registered. Registration gives your company a unique KvK number, which functions as its primary identifier in dealings with Dutch government bodies, banks and business partners. In the context of subsidies, your KvK number is one of the first pieces of information requested on almost every application form, including the WBSO, SLIM and SIB: it lets RVO verify your legal form, registered activities (via your SBI code) and registration date, all of which can affect eligibility and applicable rates — for example, whether a company qualifies as a starter. For applications submitted through mijn.rvo.nl, your KvK number also needs to be correctly linked to your eHerkenning login, and for recently founded companies this link can take some time to sync, so it is worth checking well before a deadline. Beyond subsidies, the KvK extract (uittreksel) is often required as supporting evidence during identity verification or an authorised-representative check. In short, the KvK registration is the administrative foundation on which almost every Dutch subsidy or tax application rests, which is why it is one of the first things to have in order before starting an application.
mijn.rvo.nl: mijn.rvo.nl is the secure online portal of the Netherlands Enterprise Agency (RVO) where you handle every step of your WBSO process digitally: submitting the application for a chosen application period, viewing the decision (the S&O declaration) once RVO has ruled, and, after the calendar year ends, reporting the R&D hours and costs actually realised. You access it with eHerkenning level EH3 if you are a legal entity such as a BV, or with DigiD if you are a sole trader. If an adviser or accountant applies on your behalf, you arrange this through an authorisation — for example a chain authorisation (ketenmachtiging) — so that person can reach the WBSO service without your own login credentials. The portal also shows, per application period, how much you may deduct from your payroll tax each month. Because you may submit at most three applications per calendar year, and many companies therefore choose a single annual application before 30 September of the preceding year, mijn.rvo.nl is not just the submission point but also the central overview of your running and completed WBSO periods. Without a correctly working login method on this portal, you cannot submit a WBSO application or report your realisation.
MIT scheme: The MIT scheme (Mkb-innovatiestimulering Regio en Topsectoren — SME innovation stimulation for Regions and Top Sectors) is, alongside the WBSO, one of the best-known innovation instruments for Dutch SMEs, but with a fundamentally different character: where the WBSO is a tax scheme that lowers your own R&D wage costs, the MIT is a subsidy — a payment — aimed at specific projects and collaboration. The scheme has several instruments. The heaviest are R&D collaboration projects, in which multiple SMEs jointly develop a product, production process or service, and a variant of that aimed specifically at developing artificial intelligence. There are also knowledge vouchers, which let you have an innovation question answered by a knowledge institution for a contribution of up to a maximum of 70% of the bill, and feasibility projects, which let you investigate the technical and economic feasibility of an innovation beforehand; the latter instrument is now largely administered regionally. The MIT is offered partly nationally via RVO and partly provincially, with its own opening windows and deadlines per region and top sector. For companies that both do their own R&D and collaborate with partners or a knowledge institution, the WBSO and MIT complement each other well: the WBSO covers your own development, the MIT covers collaboration or exploration — provided the same costs aren't declared twice.
Payroll tax (loonheffing): Loonheffing is the collective Dutch term for the payroll tax and national insurance contributions an employer withholds from employees' gross wages and remits to the Tax Administration via the payroll tax return. For the WBSO, loonheffing is the fiscal channel through which the benefit is delivered: companies with staff don't receive a cash payout, but a reduction on the payroll tax due — officially called the S&O-afdrachtvermindering (R&D remittance reduction). To submit a WBSO application you therefore need a payroll tax number (loonheffingsnummer), alongside your Chamber of Commerce details. The benefit flows through monthly: once RVO has issued the S&O declaration, you remit less with every payroll tax return. Sole traders without staff have no payroll tax number and no payroll tax to reduce; for them the WBSO instead works through a fixed deduction in income tax. Loonheffing also marks the boundary with adjacent schemes: the WBSO acts on payroll tax, while the innovation box lowers corporate income tax once R&D work turns a profit. Because these are different taxes, combining both schemes does not amount to double funding. In practice, this means an accurate, timely payroll tax return is a precondition for actually realising the WBSO benefit.
R&D base (S&O-grondslag): The R&D base (S&O-grondslag) is the amount over which RVO calculates your WBSO benefit. It consists of the granted R&D hours multiplied by the R&D hourly wage — either the average hourly wage of your R&D staff or the flat-rate wage — plus any additional costs and expenditure attributable to the R&D project, such as materials or equipment. A tiered rate applies to this base: in 2026 you receive 36% on the first €391,020 and 16% on the remainder, with an increased 50% rate in the first bracket for starters. The higher the base, the larger the absolute benefit, even though the percentage drops above the first bracket. The base is estimated at the time of application and, after the calendar year ends, compared with the hours and costs actually realised through the realisation report, after which RVO determines the final benefit. Because the base is directly tied to both the number of R&D hours and the R&D hourly wage used, accurate hour tracking is essential: underestimating costs you benefit unnecessarily, while overestimating leads to a correction afterwards. Employers and sole traders are treated differently: employers have the benefit settled against payroll tax over the full base, while sole traders who meet the hours criterion receive a fixed deduction instead of a base calculation.
R&D hourly wage: The R&D hourly wage is the hourly rate that, together with the number of granted R&D hours, RVO uses to calculate the R&D base — and thus the basis for the WBSO benefit. RVO sets the R&D hourly wage based on the company's payroll administration from two years earlier: the average hourly wage of the employees who performed R&D work in that reference year. If you did not hold an S&O declaration in that reference year, or lacked usable wage data — for instance because you had just started out — RVO instead applies the flat-rate R&D hourly wage, set at €29 for 2026. The R&D hourly wage therefore works with a two-year lag: changes to this year's salaries only show up in your R&D hourly wage two years from now. For companies that are growing or hiring higher-paid technical staff, this can mean the applied hourly wage (temporarily) diverges from current wage costs. The R&D hourly wage is one of the two building blocks of the R&D base, alongside the number of R&D hours; both need to be accurate to correctly calculate the WBSO benefit and to avoid issues at the realisation report stage.
Realisation report: The realisation report, also called the mededeling van realisatie, is the report you submit to RVO via mijn.rvo.nl after the calendar year ends. In it, you state how many R&D hours you actually spent per project and which costs and expenditure you actually incurred, for comparison with the estimate on which your S&O declaration was based. RVO uses this data to determine the final WBSO benefit: if the realised figures differ from the earlier estimate, the benefit is corrected accordingly. Sole traders who realised more than 500 R&D hours do not need to submit a realisation report, because they are entitled to the fixed R&D deduction in income tax instead of a base calculation. To submit the realisation report correctly and on time, it is important to keep accurate hour records and project documentation throughout the year — not only afterwards. Many companies underestimate this part of the WBSO and, as a result, miss out on benefit or face a correction. The realisation report is thus the final step in the WBSO cycle, coming after the application and the S&O declaration and before any audit by RVO.
Research and development (R&D): Research and development (S&O) is the type of work covered by the WBSO, for which you can receive reimbursement for R&D hours and costs. It covers developing technically new software, products or production processes, or carrying out technical-scientific research — always involving technical uncertainty about the outcome. RVO assesses an application using four questions you must answer for each project: what are you developing or researching, why is this technically new for your company, which technical problems do you expect, and how do you intend to solve them? Only when there is a genuine technical development challenge — not the routine application of existing technology — does the work qualify as R&D. Software development and AI/machine-learning projects form a large and growing share of WBSO applications, provided there is genuine technical uncertainty, for example a new algorithm or a model with uncertain feasibility; merely applying an existing model or an AI API generally does not qualify. Technical novelty and technical uncertainty together are the core conditions that determine whether work qualifies as R&D.
RVO: RVO, the Netherlands Enterprise Agency, is the implementing body of the Ministry of Economic Affairs that manages numerous subsidy and tax schemes for entrepreneurs on the government's behalf, including the WBSO, as well as schemes such as the MIT and Eurostars. For the WBSO, RVO does not collect or pay out money itself, since the benefit runs through the Tax Administration; RVO assesses applications, issues S&O declarations, and later checks the realisation reports. All communication runs through the mijn.rvo.nl portal: this is where you submit your WBSO application, track its status, download your decision, and send in your realisation report. Access requires eHerkenning level eH3 (legal entities) or DigiD (sole traders). For entrepreneurs new to subsidies, RVO is usually the first point of contact: alongside the WBSO, RVO also points to complementary schemes that can be combined with an S&O declaration, such as the innovation box for profit from innovation.
S&O declaration: The S&O declaration is the RVO decision issued once a WBSO application is approved. It states exactly how many research-and-development hours (R&D hours) are granted, for which projects and which period, and which financial benefit follows: a reduction on the payroll tax employers remit, or a fixed R&D deduction in income tax for sole traders who meet the hours criterion. Without an S&O declaration you cannot cash in the WBSO benefit — the declaration is the supporting document you process in your payroll tax return or income tax return. The declaration covers the application period you requested, typically between 3 and 12 months, and is based on an estimate of the R&D hours and costs you expect to make. After the calendar year ends, you compare that estimate with the hours actually realised through the realisation report, unless you qualify as a sole trader for the exemption from that requirement. Throughout the project you must also keep proper hour records and project documentation to substantiate the declaration in case of an audit. For companies that also want to use the innovation box, the S&O declaration is usually the entry ticket: without it, there is no access to the reduced 9% corporate-tax rate on innovation profit.
SIB (Support International Business): SIB (Support International Business) is a Dutch subsidy programme that helps SMEs take their first steps into foreign markets. It bundles two instruments that are most relevant for individual entrepreneurs: SIB Market Entry, a contribution towards engaging a local expert in your target market, and SIB Individual Trade Fair Participation, a contribution towards the costs of exhibiting at an international trade fair. Market Entry reimburses 50% of the costs of a local expert, up to a maximum of €2,500; the expert must have at least HBO-level education, sector expertise and an existing network in the target market. Trade Fair Participation reimburses 50% of eligible costs — stand rental and stand construction — up to €2,500 per fair, rising to 80% for a 'green' fair with a sustainability objective, with an annual stacking cap of €6,500. Applications for Trade Fair Participation must be submitted before the fair begins. Both instruments fall under the European de-minimis state aid rules, so applicants must declare any other de-minimis aid received earlier. SIB sits alongside schemes such as the WBSO, MIT and SLIM as part of the broader Dutch innovation and growth-support landscape: where those focus on R&D or staff development, SIB specifically supports the internationalisation step.
SLIM subsidy: The SLIM subsidy (Stimulating Learning and Development in SMEs) is aimed at strengthening skills, career development and a learning culture within Dutch SMEs — where the WBSO focuses on R&D, SLIM focuses on people. It reimburses 60% of eligible costs, up to a maximum of €24,999, for one or more of three activities: a company scan that results in advice on training and development needs (Activity A), career or development advice for staff (Activity B), or developing or introducing a method that stimulates learning and development, such as a company academy or a system of periodic development conversations (Activity C). Applications are only open during fixed windows — March and September 2026 — and must be submitted before the activities start; the maximum project duration is 12 months, and a minimum of €5,000 in eligible costs applies to Activities A and C. To qualify, you must be an SME registered with the KvK, not be in financial difficulty, and provide an own contribution (co-financing) alongside the subsidy. SLIM falls under the European de-minimis state aid rules, so a de-minimis declaration is required. Because it addresses staff development rather than R&D, SLIM combines well with schemes such as the WBSO, MIT and SIB as part of a broader growth strategy.
SME (small and medium-sized enterprise): MKB is the Dutch abbreviation for midden- en kleinbedrijf, the small and medium-sized enterprise (SME) segment that forms the backbone of the Dutch economy and the target group for many Dutch innovation and growth subsidies. Under the EU definition used by RVO and other Dutch authorities, an enterprise qualifies as an SME if it has fewer than 250 employees and either an annual turnover of up to €50 million or a balance-sheet total of up to €43 million; enterprises above these thresholds are considered large companies (grootbedrijf) and are excluded from SME-specific schemes, or receive a lower subsidy rate. The SME status is not just a label — it is a hard eligibility criterion woven into the design of many schemes: MIT (SME innovation stimulation) and SLIM are explicitly restricted to SMEs, and SIB likewise targets SMEs expanding internationally. Even where a scheme is open to all company sizes, such as the WBSO, SME status can still affect the applicable rate, for example the increased first-bracket rate for young, small companies (starters). Because ownership and partnership structures can affect how the thresholds are calculated — for instance, a company partly owned by a larger group may have to include that group's figures — it is worth checking your exact SME status with RVO or an advisor before relying on it in an application.
Software (WBSO): Programmatuur is the WBSO's term for software you develop yourself, as a counterpart to the categories of technically new products and production processes. Qualification isn't about what you build — an app, an algorithm, a backend system — but about whether there is technical novelty for your company and technical uncertainty that you have to resolve yourself. What matters is whether a genuine technical development question exists: did you have to devise a new approach because existing solutions fell short, and was it uncertain in advance whether and how that would work? Merely configuring, setting up, or applying existing software or standard platforms is explicitly excluded, even if that takes considerable effort. Software development is now one of the largest categories within the WBSO, with a growing share of projects in AI and machine learning — provided there too there is demonstrable technical uncertainty in the development, for instance around accuracy, scalability, or combining techniques that haven't previously been brought together in this way. Programmatuur is described in the application as a separate project or as part of a broader development project, and counts toward the same R&D hours and the same tax benefit as other qualifying WBSO work.
Starter (WBSO): Within the WBSO, a starter is a company that has received an S&O declaration at most twice in the preceding five years. This status is separate from the usual definition of a starting company used by, for example, the Chamber of Commerce or the Tax Administration, and is defined specifically for the WBSO. The significance of starter status lies in the rate: in the first bracket of the R&D base, starters receive an increased rate of 50% in 2026, compared with 36% for other applicants. Above the threshold of the first bracket (€391,020), the same 16% rate applies to everyone, so the starter benefit is limited to the first part of the base. Once a company receives its third S&O declaration within five years, starter status lapses and the regular rate applies. Starter status is intended to give young, innovative companies — often with limited cash flow — a larger tax benefit at the stage when they first invest in R&D.
State aid: State aid (staatssteun) is the EU legal term for any advantage that a government grants to a company using state resources, in a way that is selective and that could distort competition or affect trade between EU member states. Because state aid can undermine a level playing field within the internal market, European rules place strict limits on it and generally require member states to notify the European Commission before granting it. In practice, however, most Dutch innovation and growth subsidies do not go through individual notification, because they are designed to fall under a recognised exemption. The two most common exemptions are the de-minimis rule, which covers aid so limited that it is assumed not to distort competition, and the General Block Exemption Regulation (GBER), which pre-approves broader categories of aid — including many forms of R&D, training and environmental support — subject to conditions on aid intensity and eligible costs. Whether a Dutch scheme relies on de-minimis or the GBER affects what you need to declare when applying: de-minimis schemes require a declaration of aid received earlier, while GBER-based schemes instead require proof that the scheme's specific conditions are met. Understanding which exemption a subsidy falls under is therefore essential background when combining multiple schemes, since it determines how the aid is tracked and capped.
Subsidy ceiling: The subsidy ceiling is the maximum amount that a funding body — RVO, a province, or another authority — makes available for a specific scheme or opening. Once the total of the applications granted reaches this amount, the body rejects all further applications, even if they otherwise meet every condition. For schemes handled in order of receipt (first-come-first-served), it therefore pays to apply as early as possible; if several applications arrive on the same day, a lottery often decides the order. The MIT North Holland Feasibility Project 2026, for example, had a subsidy ceiling of €2,570,400 for the entire opening from 7 April to 15 September 2026, allocated in order of receipt. Not every scheme works this way: the WBSO does have an annual total budget set by the government (€1,817 million for 2026), but this budget feeds into the scheme's rates rather than causing individual applications to be rejected once a ceiling is exceeded. Knowing a scheme's subsidy ceiling helps you estimate how likely your application is to be honoured and how quickly you need to act. The subsidy ceiling is closely tied to the application period and the way applications are assessed — in order of receipt versus on quality in a tender system.
Technical novelty: Technical novelty is one of the two core conditions work must meet to qualify as research and development (S&O) under the WBSO, alongside technical uncertainty. It means that the solution you develop — a piece of software, a product or a production process — is technically new for your own company; it does not need to be new to the world or something no other company has ever built. What matters is whether your company itself does not yet have an off-the-shelf technical solution for the problem. RVO assesses technical novelty based on the project description in your application, where you explain what you are developing and why it is technically new for your company. Simply configuring or purchasing existing software, or combining off-the-shelf SaaS components without your own technical development, does not count as technically new. Technical novelty on its own is not enough, either: there must also be technical uncertainty about the outcome, otherwise the work does not qualify for the WBSO. Together, these two conditions form the core of every assessment RVO makes, whether the project involves software, AI, biotech or manufacturing.
Technical-scientific research (TWO): Technical-scientific research (TWO) is, alongside the development of technically new products, production processes or software, the second main category of work that qualifies for the WBSO. Where development projects revolve around building something new, TWO is about explanatory research: you try to understand a technical phenomenon or mechanism, aiming to acquire new technical knowledge, with an outcome that is uncertain in advance. That research doesn't have to lead directly to an applicable product — the point is the increase in knowledge itself. TWO is common in sectors where deep technical understanding is a precondition for later product development, such as biotech and life sciences, for instance research into a mechanism of action. Because TWO is less tangible than a development project, RVO's application requires an explicit description of the research design: which research question you're posing, how you approach it, and why the outcome is uncertain. An application combining TWO and development work — for example first researching a mechanism of action, then developing a product based on it — is entirely possible within a single WBSO application. The distinction from software and product development is therefore mainly methodological: TWO explains, development builds.
Top sectors: The top sectors are the economic sectors on which Dutch innovation policy concentrates, such as high-tech, life sciences & health, agri & food and energy. The idea behind this policy is that targeted collaboration between businesses, knowledge institutions and government within these sectors strengthens the Netherlands' innovative capacity and competitive position. Schemes such as MIT (SME innovation stimulation for Regions and Top Sectors) are explicitly geared towards innovation within the top sectors and their associated missions: SMEs qualify if their project aligns with a top sector and its related societal challenges. Targeted calls within a top sector, such as the MKB High-Tech call run by Holland High Tech for industrial research into key technologies, also show how top-sector policy works in practice: budgets and focus areas are tailored to specific domains within a top sector. For the WBSO, alignment with a top sector is not a requirement — that scheme assesses each R&D project on its own technical novelty and uncertainty, regardless of sector. If you want to know whether your company qualifies for top-sector-linked subsidies such as the MIT, it is therefore important to first determine which top sector and mission your project fits.
WBSO: The WBSO (Wet Bevordering Speur- en Ontwikkelingswerk) is the main Dutch tax incentive for companies carrying out research and development (R&D). It reimburses part of the wage costs of staff performing research and development (S&O) work — developing technically new software, products or production processes, or technical-scientific research with an uncertain outcome. Companies with staff receive the benefit as a reduction on the payroll tax they remit; sole traders who meet the hours criterion of 500 R&D hours per year receive a fixed deduction in income tax instead. For 2026, a rate of 36% applies to the first €391,020 of the R&D base, and 16% above that; starters receive 50% in the first bracket. You apply for the WBSO with RVO via mijn.rvo.nl, for an application period of 3 to 12 months. Once approved, you receive an S&O declaration stating the granted hours and benefit; after the calendar year ends, you file a realisation report with the hours actually spent. The WBSO can often be combined with other schemes such as the innovation box, MIT or Eurostars.
Withholding agent (S&O): An S&O withholding agent (S&O-inhoudingsplichtige) is the legal term RVO uses for an employer that withholds payroll tax on its employees' wages and that applies for the WBSO on behalf of employees carrying out research and development (S&O) work. The term matters because it marks the dividing line in how the WBSO benefit is settled: withholding agents receive their WBSO benefit as a reduction on the payroll tax they remit to the Belastingdienst, processed through the regular payroll tax return (loonaangifte), rather than as a direct payment. This is different from the route for sole traders without staff, who instead receive a fixed deduction against their income tax if they meet the hours criterion. In practice, being the S&O withholding agent for a project means you are the party named on the S&O declaration (S&O-verklaring) that RVO issues after approving a WBSO application, and you are responsible for making sure your payroll administrator applies the granted benefit correctly in the payroll tax return. It is also the withholding agent's responsibility to keep hour records for the S&O staff and to file the year-end realisation report once the calendar year has ended. Larger companies with multiple legal entities or payroll administrations should check carefully which entity is the correct withholding agent before applying, since the WBSO benefit can only be settled through that specific entity's payroll tax return.