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Quick answer
R&D Tax Relief is a retrospective HMRC corporation-tax claim — not a grant — that returns roughly 15–27p in the £ on qualifying staff, subcontractor, software and consumables spend on genuine R&D projects. Claimable annually within two years of the accounting period end. Best suited to UK companies running technically uncertain projects with credible competent professionals. Often combined with Innovate UK Smart Grants, though grant-funded spend cannot be double-claimed under the same scheme.
Funding amount
Up to ~27p per £1 of R&D spend
Region
United Kingdom
Stage
Any stage
Provider
HMRC
Advisor view
Treat R&D Tax Relief as a finance-and-engineering co-owned process, not a year-end accounting exercise. The companies that withstand HMRC enquiry are those whose engineers can describe the uncertainty in their own words.
Frequently asked questions
- Who is R&D Tax Relief really for?
- It works best for organisations that already meet the eligibility test on paper and have the operational maturity to deliver — not for businesses hoping the application will force them to formalise.
- What are the most common reasons applications are rejected?
- Weak evidence, eligibility misses, and applications that read as business as usual rather than the specific intent of the scheme. Most rejections are avoidable with earlier preparation.
- Can early-stage startups apply?
- Sometimes — but the strongest applicants usually have at least minimum trading history, a defined plan and the team to deliver. If you are pre-revenue with no plan, expect to be too early.
- How competitive is it?
- Demand routinely outstrips supply for the high-profile UK programmes. Treat any competitive call as a serious bid that needs four to six weeks of preparation, not a weekend.
- What should I prepare before I apply?
- A short written summary of what you are doing and why it qualifies, your latest accounts or forecasts, and any partner or evidence the scheme expects. Get adviser sign-off before submission.
- What happens after a successful application?
- Expect monitoring, reporting and milestone evidence. Plan the reporting cadence and internal owner before the funding lands, not afterwards.
Who it's for
UK limited companies of any size that incur direct cost on projects seeking an advance in science or technology that a competent professional could not readily deduce.
Probably not for you if…
Sole traders and partnerships, projects that are purely commercial or aesthetic, routine software configuration, or work fully funded by a non-qualifying grant or customer.
Usually too early when
Advisor signal
You have no incorporated UK company, no payroll, or the work is design/configuration rather than genuine technological problem-solving.
Eligibility
UK-incorporated company; subject to UK corporation tax; qualifying R&D activity seeking a technological or scientific advance; qualifying expenditure on staff, subcontractors (subject to new rules), externally provided workers, software, data, cloud, and consumables.
Evidence you'll need
Technical narrative for each project (uncertainty, advance, competent professional), CT600 with the new Additional Information Form, R&D claim notification (for first-time or lapsed claimants), payroll records, subcontractor invoices, time-allocation evidence.
Application timeline
Claims must be filed within 2 years of the end of the accounting period. Claim notification (where required) within 6 months of period end. HMRC processing currently 4–12 weeks, with rising volume of enquiries.
Common reasons applications fail
No technical uncertainty (just commercial novelty), inflated subcontractor cost, missed claim-notification deadline, weak project narratives, double-counting of grant-funded expenditure, or using a contingent-fee adviser whose methodology HMRC distrusts.
What improves your odds
A named competent professional, contemporaneous project notes, clear separation of qualifying vs non-qualifying staff time, and a conservative cost basis prepared by a chartered accountant rather than a commission-only boutique.
Typical successful applicant
A 5–250-employee UK software, engineering, biotech or hardware company with a clear technical roadmap, a named CTO or lead engineer, and £100k+ of annual qualifying R&D spend.
Common misconceptions
R&D Tax Relief is not free money and is not a grant — it is a corporation-tax relief subject to HMRC enquiry. It does not compete with Innovate UK funding; the two are designed to coexist.
What happens next
HMRC either pays the credit / repays tax, opens an enquiry (increasingly common), or rejects. Companies under enquiry typically need 3–9 months and specialist defence support to resolve.
What comes next
Companies that claim R&D Tax Relief consistently usually progress to Patent Box (for patented income), Innovate UK Smart Grants (for new R&D), and Innovation Loans for late-stage scale-up.
Funding context
R&D Tax Relief is the most-claimed UK innovation incentive and is almost always combined with Innovate UK Smart Grants, Innovation Loans and EIS-backed equity to fund the full R&D lifecycle.
Related routes
- Innovate UK Innovation Loans vs R&D Tax Relief
- R&D Tax Relief vs Innovate UK Smart Grants
- Patent Box or R&D Tax Relief?
- Which R&D funding route is best for my business?
- R&D Tax & Reliefs Pathway
- ICURe (Innovation-to-Commercialisation of University Research)
- Farming Equipment and Technology Fund
- Medicines Discovery Catapult Programmes
Objectives
Regions