The 2024 Budget introduced a significant restriction on R&D tax credits for loss-making SMEs. From 1 April 2024, payable tax credits are capped at £20,000 plus 3x the company’s total PAYE and NIC liabilities. If your company is loss-making and claiming R&D credits as a cash repayment, this cap could reduce what you receive.
This article explains exactly how the r&d tax credit cap loss making sme works, who it affects, and what you can do about it. We are ICAEW qualified accountants based in Manchester, and we deal with R&D claims regularly. This is practical guidance, not theoretical.
What Is The R&D Tax Credit Cap For Loss-making SMEs?
Before April 2024, a loss-making SME could surrender its R&D trading loss for a payable tax credit at 14.5% of the qualifying R&D expenditure surrendered. There was no cap on the cash repayment. Companies could receive hundreds of thousands of pounds regardless of their payroll size.
From 1 April 2024, that changed. The payable credit is now capped at the lower of:
- £20,000, plus
- 3x the company’s total PAYE and Class 1 NIC liabilities for the period
This cap applies to accounting periods beginning on or after 1 April 2024. For a company with a 31 March year-end, the first affected period is the year ending 31 March 2025. For a company with a 31 December year-end, it is the period starting 1 January 2025.
The cap targets companies that claim large R&D repayments but employ few people. HMRC’s concern was that some businesses were subcontracting all their R&D activity and claiming credits without meaningful UK payroll costs. The cap ties the credit to genuine UK employment.
Who Is Caught By The Cap?
Not every loss-making SME is affected. The cap only applies where the company is claiming a payable tax credit rather than carrying the loss forward. If your company is profitable and using R&D credits to reduce corporation tax, the cap does not apply.
The companies most likely to be caught are:
- Early-stage startups spending heavily on R&D before generating revenue
- Companies that subcontract most of their R&D activity to third parties
- Single-director companies with minimal payroll
- Companies claiming R&D credits of £50,000 or more as a cash repayment
If your company employs five full-time staff and spends £200,000 on qualifying R&D, your PAYE and NIC might total around £100,000. Your cap would be £20,000 plus 3x £100,000, so £320,000. That is unlikely to bite. But if you are a solo director with £20,000 of PAYE and NIC, your cap is £80,000. A £100,000 claim would be reduced.
How Is The Cap Calculated?
The formula is straightforward. Take the company’s total PAYE and Class 1 NIC liabilities for the accounting period. Multiply by 3. Add £20,000. That is your maximum payable credit.
Example: A loss-making software consultancy in Shoreditch with one director and two contractors has total PAYE and NIC of £45,000. The cap is £20,000 plus 3x £45,000, so £155,000. If the company’s R&D claim generates a payable credit of £200,000, only £155,000 can be paid in cash. The remaining £45,000 is lost unless the company has other options (see below).
The cap applies before the 14.5% credit rate is applied. So the maximum credit is 14.5% of qualifying R&D expenditure, but that amount is then capped by the formula. You cannot get more than the cap, even if your qualifying expenditure would otherwise generate a higher credit.
What Counts As PAYE And NIC For The Cap?
Only Class 1 employer and employee NIC counts. Class 1A NIC on benefits in kind does not. The PAYE figure includes tax, but the cap uses the total PAYE and NIC liabilities, not just the tax.
HMRC looks at the full amount of PAYE and NIC that the company reported to HMRC for the period, including any amounts that were not actually paid. If you had a time-to-pay arrangement, the liabilities still count.
The cap uses the liabilities for the accounting period, not the payments made in that period. So if your year runs January to December 2025, you use the PAYE and NIC liabilities for that 12-month period, even if some payments fell outside it.
What If Your Claim Exceeds The Cap?
If your payable credit is capped, you have three options:
1. Accept the reduced payment. You receive the capped amount. The excess credit is lost. You cannot carry it forward or claim it in a later period.
2. Carry the loss forward instead. Instead of surrendering the R&D loss for a payable credit, you can carry the loss forward against future profits. This defers the benefit but avoids the cap entirely. If your company expects to become profitable within the next few years, this may be the better option.
3. Restructure your R&D activity. If the cap is a recurring problem, consider bringing R&D work in-house. Hiring employees rather than subcontractors increases your PAYE and NIC base, which raises the cap. This is a long-term strategy, not a quick fix.
We have seen clients choose option 2 more often since the cap was introduced. The cash is useful, but losing part of the credit permanently is worse than waiting a year or two for the benefit.
Does The Cap Apply To The Enhanced R&D Intensive Scheme (ERIS)?
Yes. The cap applies to the ERIS (the intensive scheme for loss-making SMEs with at least 30% R&D spend). The same formula applies: £20,000 plus 3x PAYE and NIC.
The ERIS rate is higher (27% payable credit for expenditure before 1 April 2024, then 14.5% for expenditure from 1 April 2024 onwards). But the cap is the same. So a loss-making intensive company with minimal payroll is still caught.
HMRC has not introduced a separate cap for ERIS. The policy rationale is the same: tie the credit to UK employment.
What About Companies With No Employees?
If your company has zero PAYE and NIC liabilities, the cap is just £20,000. That is the absolute minimum. A company with no payroll can claim a maximum payable credit of £20,000 per accounting period.
This catches single-director companies where the director takes dividends only. If you are in this position and claiming R&D credits above £20,000, you need to review your approach. Paying yourself a salary through payroll would increase your cap, but the salary itself has tax and NI costs. The maths needs to stack up.
We worked with a Bristol-based tech startup that had one director on dividends only. Their R&D claim was £85,000. The cap was £20,000. They lost £65,000 of the credit. We restructured the director’s remuneration to include a salary of £30,000, which raised the cap to £110,000. The salary cost them about £3,500 in employer NI, but they recovered the full £85,000 credit. The net gain was significant.
Does The Cap Apply To RDEC Claims?
No. The RDEC (Research and Development Expenditure Credit) scheme for large companies is not affected by this cap. RDEC has its own rules and is not a payable credit in the same way. The cap only applies to the SME scheme’s payable tax credit.
If your company is too large for the SME scheme (more than 500 employees or turnover above €100m or gross assets above €86m), you are on RDEC anyway. The cap does not touch you.
How Does This Fit With The Merged R&D Scheme?
From 1 April 2024, the SME and RDEC schemes were merged into a single scheme for accounting periods starting on or after that date. But the merged scheme is essentially the RDEC structure, not the SME structure. The payable credit cap is a transitional rule that applies to loss-making SMEs claiming under the old SME scheme rules for periods starting before 1 April 2024.
For periods starting on or after 1 April 2024, the old SME scheme no longer exists. Companies that would have been SMEs now claim under the merged scheme, which has a different credit rate (15% for RDEC-style credits) and different rules on surrendering losses. The cap on payable credits for loss-making companies is built into the merged scheme’s structure, not as a separate cap.
This is complex. If your accounting period straddles 1 April 2024, you need to apportion your claim between the old and new rules. We handle this regularly and can advise on your specific situation.
What Should You Do If Your Claim Is Capped?
First, calculate whether the cap affects you. Use your actual PAYE and NIC liabilities for the period. Do not estimate. HMRC will check.
Second, decide whether to take the capped credit or carry the loss forward. This depends on your cash flow needs and your profit forecast. If you need the cash to survive, take the capped amount. If you can wait, carry the loss forward.
Third, review your R&D subcontracting arrangements. If you rely heavily on subcontractors, consider whether bringing work in-house makes financial sense. The cap is designed to encourage UK employment. If you can hire staff instead of subcontracting, your cap rises and your claim is more secure.
Fourth, talk to your accountant. This is not a DIY area. The R&D tax credit rules are detailed, and the cap adds another layer of complexity. We have seen companies lose thousands because they did not understand the interaction between the cap and the loss carry-forward rules.
Can You Avoid The Cap Altogether?
Strictly, no. If you are loss-making and claiming a payable credit, the cap applies. But you can structure your affairs to minimise its impact.
One approach is to ensure your company is not loss-making. If you have other income or can defer R&D expenditure, you might generate a profit and claim the credit against corporation tax instead. That avoids the cap entirely because the cap only applies to payable credits.
Another approach is to time your R&D expenditure. If you can accelerate or delay spending to fall into a period where your PAYE base is higher, you may increase the cap. This is legitimate tax planning, not avoidance.
We have also seen companies use the group relief provisions to surrender losses to a profitable group company, avoiding the need for a payable credit. This is only available if you have a group structure, but it can be effective.
What About Claims For Periods Before 1 April 2024?
Claims for accounting periods ending before 1 April 2024 are not affected by the cap. If you have a year ending 31 March 2024, you claim under the old rules. The cap starts from periods beginning on or after 1 April 2024.
If you have a claim outstanding for a pre-April 2024 period, file it as normal. The cap does not apply.
But be aware that HMRC is scrutinising R&D claims more closely across the board. The additional information form (AIF) is now mandatory for all claims, and HMRC is rejecting claims that do not meet the technical and accounting requirements. The cap is just one part of a wider crackdown.
Final Thoughts
The 2024 Budget cap on R&D tax credits for loss-making SMEs is a significant change. It directly affects companies that rely on cash repayments to fund their R&D activity. If you are a startup or a single-director company with a large R&D claim, you need to understand how the cap works and plan accordingly.
The key numbers are simple: £20,000 plus 3x your PAYE and NIC. If your claim exceeds that, you lose the excess unless you carry the loss forward or restructure your operations.
We recommend reviewing your R&D claim position now, especially if your accounting period starts on or after 1 April 2024. Speak to your accountant or contact us to discuss your specific situation. The rules are complex, and getting it wrong can cost you thousands.
For more on how R&D credits interact with other tax reliefs, see our fundamentals guide or the glossary of R&D terms.