The Forschungszulage has been in force since 1 January 2020 and is now the largest instrument of direct R&D funding for companies in Germany by volume. Unlike grant programmes there is no committee, no quota and no deadline: anyone who meets the criteria has a legal entitlement. The 2025 immediate tax investment programme widened the framework again from 1 January 2026[4]. This guide gives an overview of eligibility, amounts, procedure and the typical failure patterns, and points to the deeper articles in the cluster for the detailed calculations.
What is the Forschungszulage?
The Forschungszulage is a tax incentive for research and development under the Research Allowance Act (FZulG). Qualifying are R&D projects in the categories of basic research, industrial research and experimental development within the meaning of § 2 FZulG. The allowance doesn't attach to a single project with an application deadline but to the eligible expenditure of a financial year[1].
The decisive difference from grant programmes such as ZIM lies in its legal character: the Forschungszulage is a tax incentive credited against income or corporation tax under § 10 FZulG. Where it exceeds the tax liability, the excess is paid out, so for a loss-making startup the allowance is in effect a cash payment[1]. We have broken the detailed calculation down for an early-stage engineering team in our article Forschungszulage 2026 for startups.
Who is entitled?
All businesses taxable in Germany carrying out qualifying R&D are entitled, regardless of legal form, size and sector, from sole traders through a GmbH to a group company. Size doesn't decide access, only the funding rate: SMEs under Annex I of the General Block Exemption Regulation (GBER) receive ten percentage points more[3][9].
The SME definition in GBER Annex I requires fewer than 250 employees and either annual turnover up to €50 million or a balance sheet total up to €43 million[9]. What is decisive, and often overlooked in practice, is the group view: for partner and linked companies, employees, turnover and balance sheet total are attributed pro rata or in full. A nominally small startup majority-held by an investor can lose SME status through the group calculation even though it is far below all the thresholds itself. The article Forschungszulage 2026 for SMEs covers the mechanics of size classes, reference dates and public shareholdings in detail.
Amount and calculation
The rate is 25 per cent of the assessment base under § 4 FZulG, and 35 per cent with the SME uplift[3]. What matters, therefore, is the assessment base, and that was noticeably widened on 1 January 2026. Three changes from the immediate tax investment programme are central.
First, the maximum assessment base under § 3 (5) FZulG rises for expenditure after 31 December 2025 from €10m to €12m per financial year[2][4]. Second, overheads and other operating costs may be claimed as a flat 20 per cent of the remaining eligible expenditure, with no itemised evidence[5]. Third, the notional hourly rate for own work by sole traders and co-entrepreneurs rises from €70 to €100 per working hour, capped at 40 hours a week[5].
The assessment base itself is made up of staff expenditure (gross wages plus the employer's social security contributions, to the extent the work is R&D), own work, contract research (70 per cent of the fee for contracts awarded after 27 March 2024) and depreciation on assets used exclusively on the R&D project[2]. Important: the €12m limit applies per group of companies, not per entity; linked companies share the ceiling under § 3 (6) FZulG. For most mid-sized firms and almost all startups that ceiling isn't the constraint anyway; what matters is what share of the expenditure is demonstrably R&D.
The process: BSFZ and the tax office
The Forschungszulage goes through two separate procedures. At the first step you apply to the Bescheinigungsstelle Forschungszulage (BSFZ) for a certificate that a project meets the definition of qualifying research and development. That certificate is a basic assessment notice under § 171 (10) AO and binds the tax office[8]. The BSFZ assesses only substantive eligibility, not the level of costs.
Assessment is against three criteria named in the BSFZ's assessment guide (version 10/2025) and drawn from the OECD Frascati Manual: novelty, technical and scientific uncertainty, and systematic method[6][10]. At the second step, on the basis of that certificate, the company applies to the tax office for assessment of the Forschungszulage. The tax office assesses the assessment base — staff costs, own work, external services — independently[7]. A positive BSFZ decision is therefore a necessary but not sufficient condition for payment.
One feature that is rarely used: because the application to the tax office is a request to amend the tax assessment, the Fiscal Code's deadlines apply. Under § 169 (2) no. 2 AO the assessment period is four years; with the suspension of the start of that period, four full past financial years are recoverable in practice[9]. How that produces the largest rarely claimed cash flow lever in the German funding catalogue is shown in the article Forschungszulage retroactively.
Common mistakes
Six years of BSFZ files allow a sober look at the recurring failure patterns. The most common is confusing a product description with a research description: anyone describing the market benefit in the application instead of the technical challenge and the advance in knowledge misses at least two of the three criteria, however innovative the result is in the market[6].
The second pattern is incomplete time records. The BSFZ requires no receipts, but during assessment the tax office requires evidence that the working hours claimed can be attributed to the relevant project[7]. Anyone reconstructing only after the year end rarely discharges that burden reliably. Third, project delimitation: standing themes such as "product maintenance" or "digitalising manufacturing" are not projects within the meaning of the Act[6]. Fourth, the ban on cumulation under § 7 FZulG: expenditure already funded through ZIM or another aid scheme may not additionally feed into the assessment base; the same person-hour is only funded once[1].
FAQ
How much is the Forschungszulage in 2026? The rate is 25 per cent of the assessment base, and 35 per cent for SMEs on application. Since 2026 the maximum assessment base has been €12 million per financial year, giving SMEs a maximum allowance of €4.2 million a year per group of companies[3].
Is the Forschungszulage paid out? Under § 10 FZulG it is credited against the assessed tax; the excess over the tax liability is paid out as a tax refund. For loss-making companies it therefore works like a cash payment[1].
How long does it take to be paid? There is no statutory processing deadline. In practice twelve to eighteen months regularly pass between the end of the financial year and the assessment.
Can I claim the Forschungszulage retroactively? Yes. Through the assessment period under § 169 AO, four past financial years are recoverable in typical situations, provided staff records and BSFZ decisions are in place[9].
The Forschungszulage isn't an application form, it's a procedure that has to hold up beyond a tax audit: on the substance, in the accounts and across the years. That is exactly what upsmart is building the AI infrastructure for innovation management for: projects, documents and approvals live in one place, and we track the status of every application item from the project through the BSFZ certificate to the tax office assessment. Beyond consultants: a procedure that stays structured instead of being handled once.
- [1]Act on tax incentives for research and development (Research Allowance Act, FZulG)Federal Ministry of Justice · gesetze-im-internet.de · 2026Open source
- [2]§ 3 FZulG — eligible expenditure and the assessment basegesetze-im-internet.de (BMJ) · 2026Open source
- [3]§ 4 FZulG — the amount of the Forschungszulagegesetze-im-internet.de (BMJ) · 2026Open source
- [4]Act on an immediate tax investment programme to strengthen Germany as a business location (BGBl. I no. 161, 18 July 2025)Bundesgesetzblatt · 2025Open source
- [5]The immediate tax investment programme and its effect on the ForschungszulageBescheinigungsstelle Forschungszulage (BSFZ) · 2026Open source
- [6]Assessment guide of the Bescheinigungsstelle Forschungszulage (as at October 2025)Bescheinigungsstelle Forschungszulage (BSFZ) · 2025Open source
- [7]FAQ — assessment criteria and application procedure for the ForschungszulageBSFZ · 2026Open source
- [8]Ministry of Finance circular of 7 February 2023 on granting the Forschungszulage under the FZulG (AEFZulG)Federal Ministry of Finance · 2023Open source
- [9]Annex I of the General Block Exemption Regulation (Regulation (EU) No 651/2014) — the SME definitionEUR-Lex / European Commission · 2014Open source
- [10]Fiscal Code § 169 — limitation of assessmentFederal Ministry of Justice · gesetze-im-internet.de · 2024Open source
- [11]Frascati Manual 2015 — Guidelines for Collecting and Reporting Data on Research and Experimental DevelopmentOECD · 2015Open source
- Forschungszulage 2026 for startups: what the €4.2m ceiling really means
- Forschungszulage 2026: a €12m assessment base, €4.2m for SMEs — what applicants need to know now
- Forschungszulage retroactively: four years of cash flow almost nobody claims
- Calculating the Forschungszulage: what you actually get
- Forschungszulage: which staff costs are eligible
- Forschungszulage for sole traders: costing your own work correctly
- The BSFZ certificate: process, criteria and processing time
- What counts as R&D? The Frascati criteria explained simply
- Forschungszulage for contract research: the 60% rule and what has applied since 2024
- Forschungszulage rejected: reasons and what you can do
- Forschungszulage: keeping time records properly
- Forschungszulage for software development and AI: what counts and what doesn't
- The Forschungszulage in a tax audit: what the tax office checks
- Forschungszulage 2026: amounts, rates, caps
- Forschungszulage or ZIM? A direct comparison
Forschungszulage 2026 for startups: what the €4.2m ceiling really means
A €12m assessment base, a 35% SME rate on application, plus 20% overheads: a worked example for an eight-person engineering team.
Forschungszulage 2026: a €12m assessment base, €4.2m for SMEs — what applicants need to know now
The immediate tax investment programme raises the cap again. Which documentation mistakes are surfacing in the first BSFZ wave, and how to be ready for them.
Forschungszulage retroactively: four years of cash flow almost nobody claims
§ 169 AO allows closed financial years to be reopened. What the typical bootstrapped founder overlooks.
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