Research Allowance Retroactive Germany 2026

What a Retroactive Research Allowance Claim Actually Means

The Research Allowance as a Tax Credit

The Research Allowance (Forschungszulage) is the R&D tax incentive created by the Research Allowance Act (FZulG), and it pays out as a tax credit. The BSFZ, the certification body for the programme, rules on whether a project counts as research and development; the tax office then assesses the amount and sets it against income or corporation tax. Anything left over is paid out in cash, which is why loss-making companies benefit as much as profitable ones.

Why the Year You Are Claiming Decides the Amount

How much a closed year is worth depends entirely on when the work happened. For expenditure incurred after 31 December 2025, an SME claims 35 percent on an assessment basis of up to EUR 12 million, so at most EUR 4.2 million in one fiscal year. Go back to 2022 or 2023 and the same company is on 25 percent of a cap of EUR 4 million, a maximum of EUR 1 million. A smaller number, but still cash that nobody has to repay.

No reliable public figure exists for how much of this goes unclaimed, and we would not trust one if it did. In our client work the pattern is duller than any statistic: the research happened, the payroll data exists, and the year closed without anyone asking whether it qualified.

How Far Back Can You Claim?

The assessment deadline sets the outer edge of what can still be claimed, and it cannot be extended. Once it has run out, the entitlement is simply gone, and the tax office has no discretion left to give you.

How the Four-Year Deadline Works

A claim stays open until 31 December of the fourth year after the fiscal year in question, so every year carries its own clock and has to be checked on its own. The substantive conditions have to be evidenced for that year specifically, and material written while the work was running carries far more weight than anything reconstructed afterwards.

Specific Deadlines for Fiscal Years 2020 to 2023

Fiscal year / Deadline / Rate and cap / Status in 2026

2020 / 31.12.2024 / no longer relevant / expired

2021 / 31.12.2025 / no longer relevant / expired

2022 / 31.12.2026 / 25 percent on up to EUR 4 million / action required

2023 / 31.12.2027 / 25 percent on up to EUR 4 million / still time, but not much

What Is the Filing Deadline for the 2020 Research Allowance?

For 2020 the deadline ran out on 31 December 2024, and nothing brings that year back. Of the years in the table, 2022 and 2023 are the ones still open, and for a company that has never looked at them, 2026 is the year that decides it. Fiscal years 2024 and 2025 run on until 31 December 2028 and 31 December 2029, and they carry the better terms. Whichever year you reconstruct, check the Research Allowance parameters that applied back then, because they have moved twice since.

What If the Old Tax Assessment Is Already Final?

A final tax assessment does not block the claim, and this is where a lot of bad advice circulates. The Research Allowance is assessed in a procedure of its own, and under section 10 FZulG the assessed amount is credited at the next initial assessment of income or corporation tax, with any excess refunded. A 2022 assessment that became final years ago is no obstacle. Only the four-year assessment deadline itself closes the door.

Who Can Claim Retroactively, and What Counts

Which Companies Qualify?

Any company with unlimited or limited tax liability in Germany qualifies, whatever its size or legal form: GmbH, AG, SE, partnerships, sole traders and startups all fall within the scope. Size decides only the rate. An SME under Annex I of the General Block Exemption Regulation gets 35 percent and larger companies 25 percent, but for work carried out up to 27 March 2024 everyone is on 25 percent.

Which Projects Count as R&D?

The FZulG funds basic research, industrial research and experimental development, and nothing beyond that. Product maintenance, customising for a single client and routine updates fall outside it, however much effort they took. Going back through a closed year, the same four areas turn up again and again:

• Software and AI: new model architectures, training methods and data pipelines built under real technical uncertainty
• Deep tech and hardware: prototypes, sensor systems, embedded control, new material combinations
• Biotech and pharma: assay development, process development, analytical validation
• Automotive, mechanical engineering and energy: control logic, test series, test rigs, new manufacturing processes

Two rules catch retroactive claims out. Depreciation on movable fixed assets is eligible only for assets acquired after 27 March 2024 and used exclusively in the eligible project. It also reaches only fiscal years after 31 December 2023, so for 2022 and 2023 there is nothing to claim. With contract research the rate turns on a single date: 70 percent of the fee for contracts awarded after 27 March 2024, and 60 percent for anything awarded earlier. The award date decides, not the start of the work.

The overhead flat rate of 20 percent on the remaining eligible expenditure came in with the Investitionssofortprogramm, the investment stimulus act, and it applies only to projects that begin after 31 December 2025. For a retroactive claim it is therefore beside the point, and quoting it in an application for 2022 or 2023 does more harm than good.

The Numbers for a 10-Person AI Company

Take an SME with six people on R&D, EUR 540,000 in eligible wages including employer contributions, and EUR 200,000 of contract research awarded in 2023. Back then contract research counted at 60 percent, so EUR 120,000 is claimable and the assessment basis is EUR 660,000. At the 25 percent rate for that year the allowance is EUR 165,000. Had the identical costs fallen in 2026, contract research would count at 70 percent, EUR 140,000 instead of EUR 120,000, the rate would be 35 percent, and a basis of EUR 680,000 would produce EUR 238,000. The overhead flat rate stays out of both figures: it hangs on when the project began.

Why This Is Not a Grant

There is no call to win and no pre-approval, which is what separates the Research Allowance from the classic grant route through BMFTR programmes or Horizon Europe. That matters most for a retroactive claim: you are not asking for permission after the fact, you are claiming an entitlement that already existed while the work was running. For a company without a grants department, that is often the difference between claiming a closed year and losing it. We usually see it used alongside grants and bank finance, as one more line in the same mix.

Filing a Retroactive Claim, Step by Step

Filing late is a sequencing problem rather than a forms problem. Open ELSTER, the tax administration's online portal, before the projects are defined and you will spend weeks working backwards, which is exactly the time a December deadline does not leave you.

Step 1: Identify and Document the Projects

Work through one fiscal year at a time and look for technical novelty, genuine uncertainty at the outset, and a systematic approach to resolving it. Evidence here means the working material, and the pitch deck does not count. What the team produced while the project ran will carry far more weight than a summary written today:

• Project descriptions, specifications, test plans, git histories and ticket boards
• Time records, or any personnel allocation that can be traced back to a source
• Contracts for external development, with the scope of work clearly separated
• For fiscal years from 2024 onwards, evidence that machinery or laboratory equipment was used exclusively in the project, for the depreciation share

Three mistakes account for most rejections we see: routine development declared as research, personnel costs claimed without a defensible allocation, and contract research submitted without anyone reading what was commissioned. Not every external development contract qualifies, and it is the tax office that checks what you actually bought.

Step 2: Get the BSFZ Certificate

The BSFZ decides whether the project qualifies at all, and its certificate is a binding basis decision (Grundlagenbescheid) that the tax office cannot go behind. Write the application the way an engineer would explain the work to another engineer: the problem, the state of the art you were up against, the uncertainty, the work programme, and what you expected to learn from it.

Four questions are worth answering internally before anything is submitted, because thin answers here produce a thin certificate:

• What could you not solve with existing knowledge when the project started?
• Which hypotheses or technical risks were tested, and in what order?
• How does the approach go beyond routine engineering?
• Which results, dead ends and iterations were written down at the time?

Step 3: File the Assessment Application

With the certificate in hand, the application for assessment goes to the tax office through Mein ELSTER, one application per fiscal year, and this is where the eligible expenditure is actually quantified. In a group or a larger GmbH it is worth timing that against the corporation tax return, the cash forecast and the annual accounts, because the credit lands in all three.

Whatever else the file contains, four things have to be in it:

• Eligible wage costs including employer social security contributions
• Contract research at 60 or 70 percent, depending on when the contract was awarded
• The depreciation share on eligible movable fixed assets, for fiscal years from 2024
• The boundaries between fiscal years, between projects, and between this claim and any other funding received for the same work

Recognising the Research Allowance in the Accounts

When Should the Research Allowance Be Recognised?

Recognition becomes possible once the substantive conditions were met at the reporting date and the claim can be estimated reliably, whether or not the application has gone in. How firm that judgement is depends on where the application stands, how solid the documentation is, and which accounting standard the company reports under.

For a fast-growing company the allowance moves EBITDA-adjacent metrics, covenants and what you tell investors, so settle the treatment early with tax, accounting and the auditor, well before the week the accounts close. There is no generic answer to how the Research Allowance is recognised: HGB and IFRS lead to different places, and a retroactive claim covering several fiscal years has to be judged separately for each reporting period it touches.

Conclusion: The Years That Are Still Open

For 2026 the question is a narrow one: a company that has not yet filed for fiscal year 2022 has until 31 December 2026, and after that the year is gone. That year is worth 25 percent on an assessment basis of up to EUR 4 million. The Wachstumschancengesetz, the growth opportunities act, raised the SME rate to 35 percent, but only for work after 27 March 2024. The EUR 12 million cap arrived later still, with the Investitionssofortprogramm, and it reaches only expenditure after 31 December 2025. The risk was never the law. It is project delineation started too late, and uncertainty nobody wrote down at the time. Prepare the projects, the wage data, the contract research and, from 2024, the depreciation, and the year pays out as a non-dilutive tax credit that nobody has to award you. It sits alongside other funding, as long as the same costs are not claimed twice.