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Gov Owed
Open nowR&D & innovationVerified 31 Oct 2026

R&D Tax Relief (merged RDEC scheme)

HM Revenue & Customs

Check if you qualifyFree to check · no sign-up · full report £19.95

Worth

No set amount

Tax relief

Deadline

Rolling - no fixed deadline

Type of funding

Tax relief

Where

UK-wide

What it is

Taxable credit on qualifying R&D — 20% above-the-line (~15% net benefit at 25% CT).

Checked 31 Oct 2026 on GOV.UK: the merged R&D expenditure credit is still 20% and is claimed through your Company Tax Return. The 28 Oct 2026 Budget did not change the rate, and the claim notification form will no longer be required for claims made from 1 April 2027.

Official source

Who can apply

A summary of the main rules, not the full list. HM Revenue & Customs decides who is eligible, so read their guidance before you apply. The free scan checks these against your own business.

  • You're doing qualifying R&D
  • A UK Corporation-Tax-paying company
Read the full rules at the official source

How to apply, in brief

Your accountant (or whoever files your Corporation Tax) claims it inside the CT600 Company Tax Return via HMRC online services — but only after HMRC's online Additional Information Form has been submitted first.

  1. 1Check the work actually qualifies
  2. 2Send a claim notification if you're new or lapsed
  3. 3Optional: get advance assurance on tricky areas
  4. 4Gather and apportion qualifying costs
  5. 5Submit the Additional Information Form (AIF) before the return
  6. 6File the CT600 with the claim in it
  7. 7Wait for payment or questions

How long a decision takes: HMRC aims to pay or make contact on 85% of claims within 40 days of receiving the return (electronic claims with BACS details); compliance checks can add months

The full guide, with what to do at each step, the official link for it and a draft to work from, is part of the £19.95 report.

Common questions

Is R&D Tax Relief (merged RDEC scheme) open for applications?
Yes. It is open for applications, with no fixed deadline.
How much is R&D Tax Relief (merged RDEC scheme) worth?
There is no single published figure: what you get depends on your project and the funder's assessment. It is a tax relief.
Who runs R&D Tax Relief (merged RDEC scheme), and where is it available?
HM Revenue & Customs runs it. It is available across the UK.
How do I apply for R&D Tax Relief (merged RDEC scheme)?
Your accountant (or whoever files your Corporation Tax) claims it inside the CT600 Company Tax Return via HMRC online services — but only after HMRC's online Additional Information Form has been submitted first.

Does your business qualify?

Eligibility rules are where schemes get fiddly. Gov Owed checks your business against R&D Tax Relief (merged RDEC scheme) — and every other UK scheme we track — in about two minutes, free. The £19.95 report then explains exactly why you qualify, drafts your answers and walks you through the real application step by step.

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Information, not financial advice; eligibility is decided by the funder. Contains public sector information licensed under the Open Government Licence v3.0. Schemes change — confirm details on the official page before applying.