HMRC can open a compliance check on any R&D tax claim after it has been submitted. If your claim is selected, HMRC will write to you (or your agent) requesting further information. This typically includes detailed questions about the technical nature of the R&D, the people involved, the costs claimed, and the supporting documentation.
You will need to respond within the timeframe HMRC sets. Enquiries can involve multiple rounds of correspondence, meetings, and written submissions, and commonly take several months to resolve. The outcome can range from HMRC accepting the claim as submitted, to adjusting the claim value, to rejecting it entirely with repayment demands and interest.
The quality of the original claim, particularly the technical narrative and the traceability of the costs, largely determines how straightforward the enquiry process is.
For more detail on the enquiry process, read our guide to what happens during an HMRC R&D compliance check.