R&D tax relief calculator
R&D tax relief calculator: estimate first, evidence second
A calculator helps you decide whether a claim is worth taking further, but the final number depends on the company position and scheme rules.
Start with the R&D tax credit calculator if you need a quick claim-value estimate before reading the detail.
What to enter
Start with qualifying R&D expenditure, total relevant expenditure, whether the company is loss-making, and the Corporation Tax assumption. The better the cost estimate, the more useful the output.
What the output means
The result is a planning estimate. It helps with prioritisation, budgeting, and deciding whether to speak to an adviser before the Company Tax Return is filed.
Why the estimate can move
The final benefit can change when costs are excluded, apportionment is revised, ERIS conditions are not met, or evidence shows a project was commercial development rather than qualifying R&D.
Important note
R&D tax relief depends on scheme rules, company facts, accounting periods, and HMRC evidence standards. Treat this page as research support, not tax advice.