The Forschungszulage is a legal entitlement, not a discretionary decision. That means a rejection can be challenged, and in many cases it can be turned into an approval through a revised description or cleaner documentation. The first step is to understand where the application failed.
Two bodies, two grounds for rejection
The Forschungszulage goes through two separate procedures. First the Bescheinigungsstelle Forschungszulage (BSFZ) assesses whether a project meets the substantive requirements of a qualifying R&D project. Second the tax office assesses the amount of the allowance and examines the assessment base: staff costs, own work, contract research.
Rejections at the first stage concern substantive eligibility. Rejections or reductions at the second concern the cost calculation and documentation. The distinction determines which remedy applies and how you have to proceed.
Rejection by the BSFZ
The BSFZ assesses every project against three criteria based on the OECD Frascati Manual: novelty, technical and scientific uncertainty, and systematic method. An application is rejected where one of those criteria isn't recognisably met.
The most common rejection pattern is confusing a product description with a research description. Anyone describing in the application what the product should ultimately do, or what benefit it brings customers, misses the BSFZ's question. The BSFZ doesn't ask about the result but about the technical challenge: which scientific and technical question was open? Why wasn't the solution foreseeable at the project start? How was the work carried out systematically?
Further grounds for rejection at BSFZ level:
- Routine product development: adapting known processes to new customer requirements without genuine advances in knowledge doesn't count as R&D within the meaning of § 2 FZulG.
- No systematic method: a project with no clearly defined work plan and milestones doesn't count as systematically planned.
- No delimitable project: standing themes such as "product maintenance" or "digitalising manufacturing" are not projects within the meaning of the Act; the BSFZ requires a self-contained scientific and technical objective.
- The project is already complete: a project already finished at the time of application can no longer be certified.
Rejection or reduction by the tax office
The tax office doesn't reassess the BSFZ certificate; it binds as a basic assessment notice. The tax office assesses only how high the eligible expenditure is. Reductions typically arise from four causes.
- Missing time records: without complete, contemporaneous evidence of which employees spent how many hours on which R&D project, the tax office won't recognise the staff costs. Reconstructions after the fact are regularly challenged.
- Non-delimitable cost items: mixed invoices showing development and series production elements together, or assets not used exclusively on the R&D project, drop wholly or partly out of the assessment base.
- The wrong SME status: anyone claiming a 35% rate without meeting SME status under GBER Annex I — because the group view includes an investor with a holding above 25%, for instance — risks a reduction to 25%.
- Overlooked double funding: staff expenditure already funded through ZIM, EXIST or another aid programme may not additionally feed into the Forschungszulage assessment base (§ 7 FZulG). The tax office reduces it to the portion not otherwise funded.
Remedies: objection and court action
An objection is admissible against a BSFZ refusal. Because the BSFZ certificate is an administrative act, the remedy procedure follows administrative law, specifically the rules set out in the FZulG and the relevant procedural code. The objection period is normally one month from notification of the decision. An action before the competent administrative court is possible against the decision on the objection.
Against a tax office assessment that refuses or reduces the allowance, the first remedy is an objection under § 347 AO. The objection period is one month from notification. If the objection fails, an action before the fiscal court is possible.
Practically important: an objection doesn't automatically suspend the limitation period for other open financial years. Anyone wanting to claim further financial years retroactively should check whether the deadlines under § 169 AO are still running.
A new application and revision
Alongside the remedy procedure, or instead of it, a revised new application to the BSFZ is possible as long as the project isn't complete. That route is often faster: where the rejection results from an inadequate description, the project can be reformulated substantively without waiting for the outcome of an objection.
One principle applies when revising: the BSFZ assesses the project, not the company and not the product. A successful new description answers three questions precisely:
- What was the state of the art at the start of the project, and where was the technical knowledge gap?
- Why wasn't the solution foreseeable, meaning what technical and scientific uncertainty was the team working with?
- How was the approach planned systematically: hypotheses, experiments, milestones, verification steps?
With the tax office a new application doesn't help; a revised cost breakdown with evidence does. Specifically: time records per employee and project, a clear boundary between R&D time and operational work, and a clean separation of contract research and series production in invoices and contracts.
Double funding and the ban on cumulation
One frequently overlooked ground for rejection is the ban on cumulation under § 7 FZulG. The same expenditure cannot be funded simultaneously through the Forschungszulage and another state aid programme. That applies in particular to staff hours funded by ZIM, EXIST funding for the same posts, and EU project money from Horizon Europe on identical cost centres.
The clean solution isn't a question of programme but of bookkeeping: anyone splitting R&D staff across several projects — part in ZIM, part in the Forschungszulage — has to evidence the separation at the level of hours and cost centres, not just at the level of project names. Then the combination is permitted. Putting a developer's whole undifferentiated post into both programmes is not.
FAQ
Why is a Forschungszulage application rejected by the BSFZ? The BSFZ refuses where the project doesn't meet the three Frascati criteria: novelty, technical and scientific uncertainty, and systematic method. The most common reason is a description that puts the market benefit ahead of the technical challenge.
What can I do if my application was rejected? An objection is admissible against a BSFZ refusal. Alternatively, or in addition, you can file a revised new application if the project isn't complete. With the tax office the remedy is an objection under § 347 AO, followed by an action before the fiscal court.
Can a rejected project be resubmitted to the BSFZ? Yes. A new application is possible where the project description has been fundamentally revised. The BSFZ assesses the new application independently of its rejected predecessor.
What does the tax office assess, and why does it reduce amounts? The tax office doesn't assess substantive eligibility but the level of the assessment base. Reductions arise from missing time records, non-delimitable cost items, double funding with ZIM or other programmes, and mistakes in SME classification.
How long does the BSFZ take, and what happens if it refuses before the deadline expires? Typical BSFZ processing time is two to four months. A running assessment period is suspended by the application (§ 171 AO). Anyone filing a BSFZ application shortly before the four-year deadline under § 169 AO thereby secures that financial year, regardless of whether the BSFZ initially refuses and an objection is still running.
Forschungszulage 2026: the complete guide
A €12m assessment base, a 35% SME rate, a two-stage procedure: an overview of the Forschungszulage in 2026, and where to find the detail.
The BSFZ certificate: process, criteria and processing time
No Forschungszulage without a BSFZ certificate. What the certification body assesses, how the application works, and why many descriptions start from the wrong point.
Forschungszulage: keeping time records properly
Without complete time records the tax office won't accept the staff costs. How the documentation has to be structured, which formats work, and what a tax audit looks for.
What counts as R&D? The Frascati criteria explained simply
Basic research, industrial research, experimental development, or routine work? The BSFZ assesses against the Frascati criteria. Three characteristics decide.
All the detail, eligibility and pitfalls:
- [1]Act on tax incentives for research and development (Research Allowance Act, FZulG)— Federal Ministry of Justice · gesetze-im-internet.de, 2026 Source
- [2]Assessment guide of the Bescheinigungsstelle Forschungszulage (as at October 2025)— Bescheinigungsstelle Forschungszulage (BSFZ), 2025 Source
- [3]FAQ — assessment criteria and application procedure for the Forschungszulage— BSFZ, 2026 Source
- [4]Fiscal Code § 169 — limitation of assessment— Federal Ministry of Justice · gesetze-im-internet.de, 2024 Source
- [5]Fiscal Code § 171 — suspension of the limitation period— Federal Ministry of Justice · gesetze-im-internet.de, 2024 Source
- [6]Frascati Manual 2015 — Guidelines for Collecting and Reporting Data on Research and Experimental Development— OECD, 2015 Source