R and D tax relief merged scheme UK - where the rules landed
For accounting periods beginning on or after 1 April 2024 - so effectively all 2026 claims - the r and d tax relief merged scheme UK operates as a single RDEC-style credit replacing the old SME and RDEC schemes:
- A 20% above-the-line credit on qualifying expenditure - taxable, netting to roughly 15–16p per £1 for most profitable companies
- Enhanced R&D intensive support (ERIS) - loss-making companies spending 30%+ of total costs on R&D claim a payable credit worth up to ~27p per £1
- Subcontracting follows the decision-maker - broadly, the company that decides to do the R&D claims it, ending years of ambiguity
- Overseas costs largely excluded - subcontracted work and externally provided workers must generally be UK-based to qualify
- PAYE cap - payable credits are capped at £20,000 plus 300% of the company’s PAYE/NIC bill
What actually qualifies - the two-part test
Qualifying R&D must seek an advance in science or technology by resolving scientific or technological uncertainty - meaning a competent professional in the field could not readily deduce the solution. Routine development, cosmetic changes, and commercial innovation without technical uncertainty do not qualify, and claims built on them are precisely what HMRC’s compliance teams now reject wholesale.
Qualifying r and d expenditure UK rules then admit these cost categories:
- Staff costs - gross pay, employer NIC, and pension for time on qualifying activity (apportioned honestly)
- Subcontracted R&D - generally at 65% for unconnected UK subcontractors under the new rules
- Externally provided workers - agency technical staff, again UK-based and usually at 65%
- Software, cloud and data costs - licences and computation directly employed in the R&D
- Consumables - materials, prototypes consumed, and an apportionment of power and water
HMRC R and D claim process UK - the six steps in order
The hmrc r and d claim process UK now runs to a strict sequence - and two of the steps carry hard deadlines that kill claims outright when missed.
The claim sequence for 2026:
- 1. Pre-notify within 6 months of period end - mandatory for first-time claimants and lapsed claimants (3+ years)
- 2. Scope the projects against the advance-and-uncertainty test with your competent professionals
- 3. Compile and apportion qualifying costs with a defensible methodology
- 4. File the Additional Information Form (AIF) - project narratives and cost breakdowns - before the CT600
- 5. Submit the claim in the CT600 within 2 years of the period end
- 6. Retain evidence - technical records, timesheets, and the uncertainty narrative - for enquiry defence
The HMRC R and D claim process UK - pre-notification and the AIF are mandatory gates; miss either and the claim fails regardless of merit.
The enquiry environment - and how not to trigger one
HMRC now checks roughly one claim in five, and the tribunal record is unforgiving of thin claims. The reliable protections: write the technical narrative in the language of uncertainty (what was unknown, what was tried, what failed) rather than commercial benefit; keep contemporaneous records rather than year-end reconstructions; apportion staff time defensibly; and use advisers who will defend the claim at enquiry, not volume shops paid on percentages. A well-documented £80,000 claim beats an aggressive £150,000 claim that collapses under enquiry with penalties attached. If HMRC does open an enquiry, respond through advisers who wrote the claim - consistency between the AIF narrative and the enquiry answers is what closes cases quickly.
The cash flow angle - funding against your claim
Between filing and payment sits a 3–9 month gap - longer under enquiry - and for R&D-heavy businesses that money is next year’s development budget. R&D claim advances bridge it: specialist lenders advance 60–80% of a well-prepared claim within weeks of filing, repaid when HMRC pays. For companies claiming annually, some funders advance against the accruing claim in-year - effectively converting the relief into quarterly working capital. Pricing reflects claim quality, which is one more return on building the claim properly.
Worked example
A profitable software company spends £400,000 on qualifying development: £310,000 staff (apportioned), £52,000 UK subcontractors at 65% (£33,800 qualifying), £38,000 cloud and licences, £18,000 consumables - total qualifying spend £399,800. Merged scheme credit: £79,960 above the line; net benefit after tax roughly £62,000. Filed with a robust AIF in month 1 after year end, paid in month 5 - or advanced at 70% (£56,000) within three weeks of filing against next quarter’s hiring.
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