Does Your Business Qualify for R&D Tax Relief? The Tests HMRC Applies

Your business qualifies for R&D tax relief if it is a UK limited company that sought an advance in science or technology by resolving scientific or technological uncertainty that a competent professional could not readily deduce. That single test, drawn from HMRC's BEIS guidelines, decides most claims, and getting it right is the difference between a valid claim and an enquiry. R&D tax credits SME UK 2026 claims now run through the merged scheme, which replaced the separate SME and RDEC routes for accounting periods beginning on or after 1 April 2024. Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice, helps company owners test their projects against HMRC's criteria and prepare robust claims. This article explains the qualifying tests, the eligible activities and costs, the merged scheme rates, and how the claim process and advance assurance work.

Key Takeaways

• R&D tax relief requires a project that seeks an advance in science or technology by resolving scientific or technological uncertainty, tested against HMRC's definition.
• The merged R&D scheme applies a single 20% gross credit on qualifying expenditure for accounting periods beginning on or after 1 April 2024.
• The merged scheme's 20% credit is taxable, giving a net benefit of about 15% for a company paying 25% corporation tax.
• Loss-making R&D-intensive SMEs that spend at least 30% of total expenditure on qualifying R&D can claim Enhanced R&D Intensive Support worth up to about 27%.
• Qualifying costs include staff, subcontractors, externally provided workers, software, data, cloud computing and consumable items used in the R&D.
• Most claims must be filed within two years of the end of the accounting period and supported by an additional information form submitted to HMRC.

What are the qualifying tests HMRC applies to R&D?

HMRC applies a four-part test: the project must seek an advance in science or technology, encounter scientific or technological uncertainty, show that the uncertainty could not be readily resolved by a competent professional, and explain how the team tried to overcome it. Commercial novelty alone does not qualify; the advance must be in the underlying science or technology, and it must extend overall knowledge or capability in the field, not just the company's own knowledge.

Uncertainty exists where a competent professional working in the field cannot say in advance whether something is technologically feasible, or how to achieve it in practice. Routine work, applying existing techniques, and simply using off-the-shelf technology do not qualify. The advance can still count even if a competitor has already achieved it privately, provided the knowledge is not publicly available. Framing the project against these tests, in the language HMRC uses, is what makes a claim defensible.

Which activities and costs qualify for research and development tax relief?

Qualifying activities are those that directly contribute to resolving the scientific or technological uncertainty, plus certain qualifying indirect activities that support them. Directly qualifying work includes design, testing, prototyping, and the analysis needed to overcome the uncertainty. Qualifying indirect activities can include some support functions such as maintaining R&D equipment and certain administrative work that underpins the project.

The costs a company can claim are defined by category. Eligible research development tax relief costs include a proportion of staff salaries, employer's National Insurance and pension contributions for staff working on the R&D, payments to subcontractors and externally provided workers, consumable items such as materials and a fair share of power, software licences, and, since April 2023, data and cloud computing costs. For accounting periods beginning on or after 1 April 2024, most subcontracted R&D can be claimed by the company that decides to carry out the work and bears the risk, which is a significant change from earlier rules.

How much is an R&D claim worth under the merged scheme in 2026/27?

The merged scheme gives a single 20% gross credit on qualifying R&D expenditure, and because the credit is itself taxable, a profit-making company keeps roughly 15% after 25% corporation tax. This above-the-line credit replaced the old SME enhancement and the separate RDEC scheme HMRC previously operated in parallel. For loss-making companies, the credit can produce a payable cash amount subject to a PAYE and NIC cap.

A worked example shows the value. A profitable company with £200,000 of qualifying R&D spend receives a 20% credit of £40,000. As the credit is taxable at 25%, the net benefit is £30,000, an effective 15% of the spend. A loss-making R&D-intensive SME spending the same £200,000, with at least 30% of its total expenditure on qualifying R&D, may instead claim under Enhanced R&D Intensive Support, which can be worth up to around 27%, or roughly £54,000, reflecting the higher support Parliament targeted at the most research-focused small companies. For the full picture of how the schemes interact, see our guide to R&D tax credits for small businesses.

How do you claim R&D tax relief and use advance assurance?

You claim R&D tax relief through the company tax return, supported by a mandatory additional information form filed with HMRC before or at the same time as the return. The additional information form sets out the projects, the scientific or technological advance and uncertainty, a breakdown of qualifying costs, and details of the agent and a named company officer. Many first-time claimants must also submit a claim notification form in advance, generally within six months of the period end, or the claim is invalid.

The deadline to make a claim is normally two years after the end of the relevant accounting period, so a company with a 31 March 2026 year end usually has until 31 March 2028. Advance assurance is available to some smaller companies making a first claim, giving HMRC's agreement in principle that R&D activity qualifies for up to three accounting periods, which reduces the risk of a later enquiry. Given HMRC's increased compliance activity on R&D, precise record-keeping and a well-evidenced technical narrative are essential.

Frequently Asked Questions

What counts as R&D for tax relief purposes?

R&D for tax purposes is work that seeks an advance in science or technology by resolving scientific or technological uncertainty that a competent professional could not readily overcome. It is not limited to laboratories; software development, engineering and manufacturing process improvements can all qualify if they meet HMRC's tests. Commercial innovation without a technological advance does not count.

How much can an SME claim in R&D tax credits in 2026?

Under the merged scheme, a company receives a 20% gross credit on qualifying R&D spend, worth about 15% net after 25% corporation tax. A loss-making R&D-intensive SME that spends at least 30% of total expenditure on qualifying R&D can claim Enhanced R&D Intensive Support worth up to around 27% of the qualifying costs.

Is the SME R&D scheme still separate from RDEC in 2026?

No. For accounting periods beginning on or after 1 April 2024, the separate SME scheme and the RDEC scheme HMRC previously ran have merged into a single 20% credit. The only distinct route that remains is Enhanced R&D Intensive Support for loss-making SMEs that spend at least 30% of their expenditure on qualifying R&D.

What costs can I include in an R&D tax relief claim?

You can include staff costs, employer's National Insurance and pension contributions, payments to subcontractors and externally provided workers, consumable materials, a share of utilities, software licences, and data and cloud computing costs used in the R&D. Capital costs such as buildings are excluded, though separate R&D capital allowances may apply.

How long do I have to make an R&D claim?

You normally have two years from the end of the accounting period to make an R&D claim. Many first-time claimants must also file a claim notification form within six months of the period end, and every claim must include the additional information form. Missing these deadlines usually makes the claim invalid.

How Blue Tick Can Help

Blue Tick Accountants tests your projects against HMRC's qualifying criteria, identifies every eligible cost, and prepares the technical narrative and additional information form that a robust claim now demands. With HMRC scrutinising R&D claims more closely than ever, expert preparation protects both your relief and your peace of mind. Head to our website and book a meeting now.

Conclusion

R&D tax relief rewards companies that resolve real scientific or technological uncertainty, and the qualifying tests, not the industry label, decide whether a project counts. Under the merged scheme a valid claim is worth about 15% of qualifying spend, rising to as much as 27% for the most R&D-intensive loss-making SMEs. Document the technical advance clearly, capture every eligible cost, and file the required forms on time to secure the relief and withstand HMRC scrutiny.

About the Author

This guide was written by Leon, founder of Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice that helps limited company owners, landlords and the self-employed across the UK claim the reliefs they are entitled to. It was last reviewed for the 2026/27 tax year.

This article is intended for general informational purposes only and does not constitute tax, legal, or financial advice. Tax rules are subject to change and their application will depend on your individual circumstances. You should always seek advice from a qualified professional before taking action. Blue Tick Accountants accepts no liability for decisions made on the basis of this content.

Related reading: R&D Tax Credits: How Much Could Your Limited Company Claim?.

Related reading: The Merged R&D Relief Scheme: What Changed in April 2024.