No. Payment means your return was processed, not that your claim was examined and agreed. HMRC works on a process-now, check-later basis: most R&D claims are paid when they are filed, and the questions come afterwards, if they come at all.
Why HMRC pays first and checks later
The sequence is deliberate, and HMRC describes it itself. Its published account of its approach to the R&D reliefs records that it opens some compliance checks after payment — which gets money to companies quickly, while leaving open the possibility that a claim is later found non-compliant and the payment recovered.
So the payment run and the compliance work are two separate processes running on two different timescales. Around one in six claims was checked in 2023-24, the most recent year HMRC has published, and those checks are not all made before the money goes out. A claim can be paid in weeks and read properly a long time afterwards.
What payment does and does not tell you
It tells you the return reached HMRC’s systems and the figures were processed. That is the whole of it.
It does not tell you that anyone tested whether the work meets the statutory definition of R&D, whether the advance was framed at the level of the field rather than of your own company, whether the costs sit in the categories they were put in, whether the Additional Information Form answered the questions an officer would actually ask, or whether the procedure was right — a missed notification or a missing AIF invalidates a claim whatever its technical merit.
The expensive version of the misunderstanding is the run of paid claims. Several years of payments feel like several years of confirmation. They are several years of processing, and where the same defect sits under each claim, it is not one problem waiting to be found. Silence is not evidence that the claims were sound; it is evidence that nobody has read them.
How long the exposure lasts
Longer than most companies assume, and measured in years rather than weeks. How far back HMRC can reach depends on the return, the period and — where an error was careless or deliberate — on behaviour. The enquiry and discovery windows are set out in can HMRC make me pay back an R&D tax credit?, and the amendment windows that run alongside them in backdated R&D claims. What a check involves once one is opened is in our HMRC enquiries guide.
The consequence is what makes the timing matter. If the claim contained errors, relief can be repaid with interest, and in some cases with penalties, years after the money was received and spent.
What a company that wants certainty can do
Keep the evidence while it still exists. Records made at the time — who worked on which project, what was not known and why, cost workings that reconcile to the accounts — are what separates a claim that holds up under a check from one reconstructed under pressure two years later. They are also far easier to keep than to recreate.
Then get an independent view of what has already been filed. If your claims have always been paid without questions and nobody outside the process has read them, our free claim review is a confidential second opinion on your most recent claim, under a mutual NDA, including claims prepared by another adviser. Where a problem does surface, finding it yourself is the cheaper outcome: an unprompted disclosure materially reduces any penalty, and HMRC runs a route for making one. For claims we prepare, enquiry support is included as standard.
Sources
- HMRC’s approach to R&D tax reliefs 2023 to 2024 — compliance checks opened after payment, the recovery of payments on claims later found non-compliant, and 9,700 checks against 61,000 claims received in 2023-24.
- Tell HMRC if you’ve claimed too much R&D tax relief — the disclosure route for an overclaim a company finds itself.
This page describes the rules as they stood at the review date above, as general information rather than advice on your circumstances. For how that distinction works, see our terms; for an answer on your own facts, talk to us.