Does HMRC possess the authority to retain or withhold the tax repayment for R&D purposes?

Yes, HMRC has the authority to delay reimbursement of R&D tax credits to ensure that your claim is up to their standards.

If HMRC have queries about your claim, they may investigate which places your reimbursement on hold until the investigation is complete. Unfortunately, there isn’t an exact timescale for how long an investigation into your R&D tax credit claim may be.

If HMRC identifies areas of uncertainty within an R&D tax credit claim, they may open an enquiry to source further data and information to support the claim further. When an enquiry is opened, any payable credit is usually put on hold while HMRC assesses the qualifying R&D activity, supporting evidence, and eligible expenditure included in the submission.

While there is no fixed timeframe for the process of enquiry, the duration will depend on the complexity of the claim and how quickly communication is addressed.

During an enquiry, HMRC may accept certain elements of a claim while continuing to review others. In these cases, it is sometimes possible to request a partial payment for the agreed apportioned amount. This will depend on how HMRC views the R&D tax credit claim, but it is not guaranteed.

HMRC also has the authority to recover completed payments. This can occur if an R&D claim is later found to be inaccurate or if an enquiry is opened after the tax relief has been paid to the business. In practice, this means that receiving a payment does not represent a final agreement from HMRC.

For this reason, R&D tax credit claims must be prepared with a clear technical narrative, accurate cost treatment and supporting documentation that demonstrates how the work undertaken clearly meets the definition of qualifying R&D activity. A well-supported claim reduces uncertainty and allows HMRC to reach a decision in a more efficient manner.