R&D tax relief calculators
Three 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.
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 →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 expenditure. It gives your intensity ratio and how much headroom — or shortfall — you have against the threshold.
£450k R&D of £1.4m total → 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.