Netherlands R&D Tax Credits and WBSO Guide

WBSO — Wage Tax Credit for R&D

• 32% / 16% credit on R&D wages: The WBSO provides a reduction in the employer's payroll tax (loonheffing) equal to 32% of qualifying R&D wages up to €350,000, and 16% on the excess (2026 rates). For startups (first 5 years, the TANTO — Tegemoetkoming voor startende ondernemers), the first bracket is 40% (instead of 32%). The credit is calculated on a per-company basis — groups of companies must aggregate the R&D hours across the group (the concernregel). The maximum credit per year is approximately €14 million (the WBSO budget is annually capped — the credit is subject to the annual WBSO budget ceiling of ~€1.2 billion).
• Mechanics — payroll tax reduction: The WBSO credit is applied against the monthly payroll tax remittance (loonheffing). The company calculates the WBSO amount and reduces its monthly loonheffing payment to the Belastingdienst. If the WBSO credit exceeds the monthly payroll tax, the excess can be offset against other taxes (BTW, Vpb) or refunded. The WBSO credit does not affect the employee's personal income tax position — the employee still receives a full loonheffingskorting (payroll tax credit) on their personal income.

S&O-verklaring — R&D Declaration Application

• Apply before R&D starts: The company must apply for the S&O-verklaring (R&D declaration) from RVO before the R&D project begins. The application is filed quarterly: Q1 (apply by 31 March for activities Jan–Mar), Q2 (by 30 June for Apr–Jun), Q3 (by 30 September for Jul–Sep), Q4 (by 31 December for Oct–Dec). Late applications are only accepted for Q4 (the December window). The application must describe: the R&D project (technische R&D, software development, agriculturally oriented R&D, or AFAS — Applying Fundamental Research), the number of hours allocated, and the R&D employees (the S&O-medewerkers).
• Qualifying R&D activities: The RVO defines qualifying R&D as: (a) technisch-wetenschappelijk onderzoek (technical scientific research — developing new technical products, production processes, or software), (b) software development (developing new software that is technically complex and involves uncertainty — generic software development without technical novelty does not qualify), (c) agrarisch R&D (agricultural R&D — developing new plant varieties, agricultural processes), and (d) AFAS — Applying Fundamental Academic Research (fundamental research findings applied to a new product or process). Routine activities (testing, maintenance, production) do not qualify.

RDA — Research and Development Deduction

• 25% additional deduction (phased out): The RDA was an additional deduction of 25% of R&D costs other than wages (materials, consumables, outsourced R&D, and depreciation on R&D equipment). The RDA is being phased out: 2024 (12.5%), 2025 (4.3%), 2026 (0%) — fully eliminated. The RDA was claimed in the corporate tax return (aangifte Vpb) — it reduced taxable profit by 25% of qualifying non-wage R&D costs. With the phase-out, companies should focus on the WBSO for wage-related R&D and the innovatiebox for IP income.

Interaction with Innovation Box

• WBSO and innovatiebox — independent and additive: A company claiming WBSO for R&D wages can also benefit from the innovatiebox (9% rate on qualifying IP income). The WBSO credit is granted on the wage costs of the R&D activities; the innovatiebox applies to the income generated by the resulting IP. The two incentives are independent — claiming WBSO does not prevent the company from applying the innovatiebox, and vice versa. However, the S&O-verklaring (R&D declaration) is required for both: WBSO (to claim the wage tax credit) and innovatiebox (to establish that the IP was self-developed through qualifying R&D).

For the full innovatiebox regime, including the nexus approach and qualifying IP assets, see our Innovation Box and IP Tax Guide →. For the corporate tax rate structure and fiscal unity rules, see our Corporate Tax Guide →. For the payroll tax system through which the WBSO operates, see our Payroll Tax Guide →.