Why the cap exists
Payable credits hand out cash, and cash attracts structures. The cap ties the payable amount to the company’s own UK payroll so that credits flow to businesses with real UK employment substance rather than to shells routing R&D spend. That policy intent explains its shape: a fixed buffer so genuinely small companies are not strangled, plus a multiple of payroll taxes so the cap scales with real headcount.
The formula
For both the merged scheme and ERIS, the cap is £20,000 plus 300% of the company’s relevant PAYE and National Insurance liabilities for the period. “Relevant” carries a statutory definition, broadly built from the company’s PAYE and Class 1 NIC position with adjustments for connected-company arrangements, and the computation deserves care rather than a payroll-report shortcut.
The two consequences, and why ERIS is stricter
The merged scheme treats the cap as a flow restriction: what cannot be paid this year becomes expenditure credit for the next period, so value defers rather than dies. ERIS treats the cap as a validity condition: a claim for credit above the cap is invalid. That asymmetry makes cap modelling a pre-claim task for ERIS companies, because an invalid claim is a compliance event, not a rounding error.
The exemption
A company is exempt from the cap where, in broad terms, it is engaged in creating or managing relevant intellectual property through its own staff. Its spending with connected parties on EPWs and subcontracting must also stay within set limits. The test’s purpose is to spare genuine IP-creating businesses with thin payrolls, early-stage, founder-led, laboratory-light companies, while keeping the anti-abuse teeth for routed structures.
Whether you meet it is a facts question worth settling early: it is also one of the specific areas HMRC’s targeted advance assurance pilot can cover for eligible SMEs.
The planning honesty note
The cap rewards one thing: real UK payroll. If the cash credit matters to your runway, the structural answers are employment substance and timing, not creative definitions of “relevant”. And if this year’s payment is capped under the merged scheme, the carry-forward means the value is deferred, not lost, which changes the cash-flow conversation rather than the claim decision. Where the cap bites hardest, loss-making companies, the wider picture is on R&D relief for loss-making companies.
- HMRC, CIRD140000 (the PAYE cap), Corporate Intangibles Research and Development Manual, gov.uk
- HMRC, Research and Development (R&D) tax relief: the merged scheme and enhanced R&D intensive support, gov.uk
- HMRC, Apply for targeted advance assurance (PAYE cap exemption listed as a coverable area), gov.uk
Frequently asked questions
Does the cap reduce our claim?
It limits the payable amount, not the claim itself. Under the merged scheme an excess carries forward as credit for the next period; under ERIS a claim above the cap is invalid, so the claim has to be made within it in the first place.
Whose PAYE counts, just the R&D team's?
No, the cap is built on the company's relevant PAYE and NIC liabilities as defined, which is broader than the R&D staff alone, with adjustments in connected-company situations. The precise definition is one to work through with the computation, not to assume.
We have almost no payroll. Is the cash claim dead?
Not automatically. The £20,000 buffer exists precisely for small cases, an exemption exists for companies creating or managing intellectual property without excessive connected-party subcontracting, and the merged scheme's carry-forward preserves value even where this year's payment is capped.
Can we get certainty on the exemption in advance?
The PAYE cap exemption is one of the areas HMRC's targeted advance assurance pilot can cover for eligible SMEs, which is worth knowing if the exemption is the difference between claiming and not.