If you run a company in the Netherlands and your team is building something technically new, such as software, hardware, or a production process, there is a good chance the Dutch government will help pay for it. The scheme that does this is called the WBSO.
This guide explains what WBSO is, who can use it, how much it is worth, and how the application and administration actually work. It is written for complete beginners. No prior WBSO knowledge needed.
What is WBSO?
WBSO stands for Wet Bevordering Speur- en Ontwikkelingswerk, which roughly translates to the Promotion of Research and Development Act. In practice, everyone simply says WBSO.
It is the main R&D tax incentive in the Netherlands. Instead of paying out a grant, the WBSO lowers the wage tax (payroll tax) you pay for the people doing research and development. Self-employed professionals get a fixed tax deduction instead.
The scheme is carried out by RVO, the Netherlands Enterprise Agency, on behalf of the Ministry of Economic Affairs. You apply to RVO, RVO assesses whether your work qualifies as R&D (in WBSO terms: speur- en ontwikkelingswerk, or S&O), and if approved you receive an S&O-verklaring (R&D declaration). That declaration is what lets you pay less payroll tax.
Strictly speaking the WBSO is a tax credit, not a subsidy. But you will hear people say “WBSO subsidy” all the time, and for a beginner the practical takeaway is the same: qualifying R&D work becomes significantly cheaper.
Who can apply for WBSO?
Two groups can use the WBSO.
Companies with employees. Any company that withholds Dutch payroll tax can apply for the R&D work its own employees perform, from a two-person startup to a large corporate. There is no minimum size and no requirement to be a “tech company”.
Self-employed professionals (zzp). If you are self-employed and spend at least 500 hours per year on qualifying R&D, you can apply for a fixed deduction on your income tax.
In both cases the R&D must be carried out by you or your own employees, within the European Union. Work you outsource to another company does not count for your own application.
What work qualifies as R&D under WBSO?
The WBSO recognizes two types of projects.
Development projects: the development of technically new products, production processes, or software. “Technically new” means new for your company. You do not need to be the first in the world, but there must be real technical uncertainty. You are solving technical problems whose solution is not readily available, and there is a genuine risk the chosen approach will not work.
Technical-scientific research: research that aims to explain phenomena in areas like physics, chemistry, biotechnology, or information technology.
For software teams, qualifying work often looks like this: designing a new architecture to meet performance constraints that existing components cannot handle, developing new algorithms or models, or solving integration problems where proven solutions fall short.
Just as important is what does not qualify: routine maintenance and bug fixing, configuring or implementing existing software, building a standard application with proven technology, and non-technical work such as design, marketing, or project management. The dividing line is always technical novelty and technical uncertainty.
How much is WBSO worth in 2026?
For companies with employees, the benefit is a percentage of your S&O base: the R&D wage costs plus other R&D costs and expenditures (or a flat rate per hour if you prefer not to track those separately).
In 2026 the rates are: 36% over the first €391,020 of the base, and 16% above that. Starters get 50% instead of 36% in the first bracket.
A simple example: one developer spends 1,000 approved hours on R&D at an S&O wage of €35 per hour. That is €35,000 in R&D wages, plus €10,000 using the flat rate of €10 per hour, so a base of €45,000. At 36% the company pays about €16,200 less payroll tax that year. A starter would save €22,500.
Self-employed professionals get a fixed S&O deduction of €15,979 in 2026, plus an additional €7,996 if they qualify as a starter.
Rates and thresholds change from year to year, so always check the current numbers with RVO before you build a business case on them.
How does applying for WBSO work?
You apply online through the RVO portal. Companies log in with eHerkenning (level 3); self-employed professionals use DigiD.
In the application you describe your R&D projects: what you are developing, why it is technically new, which technical bottlenecks you expect, and how you plan to solve them. This is the part beginners underestimate. RVO does not want a product pitch. It wants to understand the technical problem.
Timing matters, because WBSO is never retroactive. You can submit up to four applications per calendar year. A period starts on the first day of the month after you submit and runs until the end of the calendar year, and 30 September is the last day to apply for the remainder of the year. Want WBSO from 1 January? Then your application has to be in before the deadline in December.
RVO reviews the application, may ask follow-up questions, and, if the work qualifies, issues the S&O-verklaring stating your approved hours. From that moment you can apply the tax reduction in your payroll tax return.
Your obligations after approval
Getting the S&O-verklaring is not the end of the process. The WBSO comes with administration duties, and this is where most teams get into trouble.
Hours administration. You must record the R&D hours per person, per project, per day. Not estimates at the end of the year, but an actual, current record.
Project administration. You must keep evidence of the R&D work itself: designs, test results, experiments, prototypes, technical decisions. The administration has to show the nature, content, and progress of the work, and RVO expects it to be kept up to date while the work happens, not reconstructed afterwards.
The mededeling. After the year ends, you report the hours (and costs, if applicable) you actually realized to RVO, no later than 31 March. Realized fewer hours than approved? Then part of the benefit is corrected.
RVO also performs company visits to check whether the administration matches the approved projects. If the records are missing or thin, the benefit can be reclaimed and fines are possible.
Common beginner mistakes
Applying too late. WBSO only covers work from the start of the application period. Hours you made before that are lost.
Describing the product instead of the technical problem. “We are building a platform for X” is not R&D. “We need sub-second search across millions of records and existing approaches fail because…” is.
Leaving the administration until December. The hours and evidence requirements are continuous. A year-end reconstruction is painful, unconvincing, and risky in an audit.
Claiming routine work. Mixing maintenance and standard implementation work into WBSO hours is the fastest way to problems during an RVO check.
Missing the mededeling. Forgetting the 31 March deadline for reporting realized hours creates entirely avoidable trouble.
Keep the dossier alive, not just the application
Most companies get the application right, often with help from an advisor. What goes wrong in practice is the year after: hours are not registered, evidence stays scattered across GitHub, Linear, documents, and people’s memories, and by the time the mededeling or an RVO visit comes around, someone has to reconstruct everything.
That is the problem R&Dossier focuses on. It keeps your WBSO projects, hours, and technical evidence organized in one review-ready workflow throughout the year, with integrations that pull relevant work from the tools your team already uses.
The WBSO is one of the most valuable incentives available to innovating companies in the Netherlands, and one of the easiest to lose value on through poor administration. Understand the scheme, apply on time, and keep the dossier alive while the work happens.
Frequently asked questions about WBSO
Is WBSO a subsidy or a tax credit?
Strictly speaking, WBSO is a tax credit: it reduces the payroll tax companies pay for R&D employees, or gives self-employed professionals a fixed income tax deduction. Many people still call it the “WBSO subsidy”, but no money is paid out; you simply pay less tax.
What does WBSO stand for?
WBSO stands for Wet Bevordering Speur- en Ontwikkelingswerk, the Dutch law that promotes research and development (speur- en ontwikkelingswerk, or S&O) by lowering its wage costs.
Who is eligible for WBSO?
Dutch companies that withhold payroll tax can apply for R&D performed by their own employees within the EU. Self-employed professionals qualify if they spend at least 500 hours per year on qualifying R&D. There is no minimum company size.
How much is WBSO worth in 2026?
In 2026 companies receive 36% of the first €391,020 of their R&D wage costs (plus other R&D costs or a flat rate) as a payroll tax reduction, and 16% above that. Starters receive 50% in the first bracket. Self-employed professionals get a fixed deduction of €15,979, plus €7,996 for starters.
When do I need to apply for WBSO?
Before the work you want covered, because WBSO is never retroactive. You can submit up to four applications per calendar year; each period starts on the first day of the month after you submit and runs until the end of the year. 30 September is the last day to apply for the remainder of the year.
What administration does WBSO require?
You must keep an hours administration (R&D hours per person, per project, per day) and a project administration with technical evidence showing the nature, content, and progress of the work. After the year ends you report realized hours to RVO in the mededeling, no later than 31 March.