Calculators and tools
Five tools we built because we needed them ourselves, using the rates for accounting periods beginning on or after 1 April 2024. Each is free, runs entirely in your browser, and gives an illustration rather than advice — real positions turn on details a calculator cannot see. Our guides cover the same ground in depth, starting with which scheme applies.
R&D eligibility checker
Is our work likely to qualify at all?
Seven short questions on the tests that decide most claims: what you were aiming at, what was genuinely unknown, who can explain it and who commissioned it. It tells you plainly when the answer is no.
Seven questions → a reasoned verdict, not a score →Claim notification deadline checker
Do we have to tell HMRC before we can claim?
Enter your period of account and claim history. It gives you the notification deadline, whether the window is still open, and whether the rule catches you at all.
Year to 31 Mar 2026 → notify by 30 Sep 2026 →R&D deadline calculator
When does every date in our claim fall?
Enter your accounting dates. It returns every deadline: filing, claim, notification, AIF, enquiry and discovery.
Year to 31 Dec 2025 → claim by 31 Dec 2027 →Claim value calculator
What would a claim actually be worth?
Enter your qualifying spend and profit position. It shows the after-tax value under the merged scheme, or ERIS if you are a loss-making, R&D-intensive SME.
£100,000 qualifying spend → up to £26,970 →ERIS intensity calculator
Do we clear the 30% intensity threshold?
Enter your relevant R&D spend and total relevant expenditure. It gives your intensity ratio and how much headroom — or shortfall — you have against the threshold.
£450k R&D of £1.4m total relevant expenditure → 32.1% →
Want the real number, not the estimate?
A first conversation costs nothing and commits you to nothing. You will speak to a qualified adviser, not a salesperson.