The R&D Tax Credit PAYE Cap: How It Limits Your Payable Credit

Quick answer: The PAYE cap limits the payable element of an R&D tax credit to £20,000 plus 300% of the company's relevant PAYE and National Insurance contributions for the period. It exists to stop companies with little UK employment claiming large cash credits, and applies to both the merged scheme and ERIS.

The PAYE cap is one of the parts of an R&D claim that catches companies out most often, because it can restrict a payable credit even when the underlying R&D clearly qualifies. It is an anti-abuse rule that ties the cash you can receive to the amount of UK employment tax you actually pay. The formula is set out in HMRC's merged scheme guidance, and this guide explains how it works and who it affects.

What Is the R&D Tax Credit PAYE Cap?

The cap limits the payable, cash element of an R&D credit. It does not reduce the qualifying expenditure itself; it caps how much of the resulting credit a company can receive as a payment. The limit is £20,000 plus 300% of the company's relevant PAYE and National Insurance contributions liabilities for the period. A company with very little UK payroll therefore has a low cap, which is the point of the rule.

How Is the PAYE Cap Calculated?

The calculation starts from the company's relevant PAYE and NIC for the accounting period, multiplies that figure by three, and adds a fixed buffer. In formula terms, the cap is the £20,000 fixed amount plus three times the relevant PAYE and NIC liabilities. Working out the "relevant" PAYE and NIC figure is the part that needs care, because it can include amounts relating to workers provided by connected companies who are engaged in the R&D, rather than only the claimant's own payroll [own-analysis]. Our guide to qualifying expenditure covers which staff costs feed into a claim in the first place.

Which Claims Does the PAYE Cap Affect Most?

The cap bites hardest on loss-making companies that surrender losses for a cash credit but carry little UK payroll, for example an early-stage company that outsources most of its work or pays founders through dividends rather than salary [own-analysis]. Profitable companies using the credit against a Corporation Tax bill are less exposed, because they are not relying on the payable route. Our guide for loss-making companies and our pre-revenue R&D claim guide explain those situations in more detail.

What Happens if My Claim Exceeds the Cap?

If the payable credit works out higher than the cap, the excess is restricted rather than simply paid, and the rules for the merged scheme set out how the restricted amount is treated. Because the £20,000 buffer sits on top of the payroll-based part, many smaller claims never hit the cap at all. If you want to sanity-check the figures, our free R&D tax relief calculator gives an indicative range to start from.

Get a Written View, No Call Required

If you are worried the PAYE cap could restrict your payable credit, reply and we will send a free written eligibility assessment within 48 hours, no call involved [own-analysis].