Does HMRC need to know before you claim R&D tax relief?

For some accounting periods, HMRC must be notified within six months of the period ending, miss the window and the claim for that period is normally lost. This checker gives you a definitive answer for your period, the exact deadline, and how long you have left.

This is guidance based on the answers given, not tax advice. PSS confirms every notification position against the legislation before anything is filed.

We use the information you enter to work out your notification deadline and to follow up with you about it. The result is a guide only — it is not advice, and no decision about your claim is made automatically. See our Privacy Notice for full details.