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R&D Tax Credits for Small Businesses

GrantsLast reviewed: 1 April 20257 min

Research and Development (R&D) tax credits are a government incentive encouraging UK businesses to invest in innovation. From April 2024, most businesses use the merged R&D expenditure credit (RDEC) scheme, while loss-making SMEs with very high R&D intensity can access enhanced relief under the ERIS (Enhanced R&D Intensive Support) scheme. Both can significantly reduce your tax bill or generate a cash payment.

Key points

  • From April 2024, a merged R&D scheme replaced the previous SME and RDEC schemes for most businesses.
  • The merged scheme provides a 20% above-the-line credit on qualifying R&D expenditure.
  • R&D-intensive loss-making SMEs can claim Enhanced R&D Intensive Support (ERIS) at a higher rate.
  • HMRC has significantly increased compliance checks — ensure claims are well-documented and accurate.

What Qualifies as R&D

For tax purposes, R&D must seek to achieve an advance in science or technology by resolving a scientific or technological uncertainty. This is a broader definition than many businesses realise — it is not limited to laboratory research or high-tech sectors. R&D can occur in manufacturing, construction, software development, food production, and many other industries.

Qualifying activities include developing new products, processes, or services, or appreciably improving existing ones where the outcome is not readily deducible by a competent professional in the field. Qualifying costs include staff costs (salaries, NIC, pension), consumables used in R&D, software used directly in R&D, and from April 2023, data licences and cloud computing costs. Subcontracted R&D costs are partially qualifying under the merged scheme.

The Merged R&D Scheme from April 2024

For accounting periods beginning on or after 1 April 2024, most companies use the merged R&D expenditure credit (RDEC) scheme. This provides a 20% above-the-line credit on qualifying R&D expenditure. The credit is taxable, so the net benefit for a profitable company paying 25% Corporation Tax is approximately 15% of qualifying spend. For loss-making companies in the merged scheme, the credit can be surrendered for a cash payment after tax.

The Enhanced R&D Intensive Support (ERIS) scheme applies to SMEs where qualifying R&D expenditure is at least 30% of total expenditure (40% for periods before 1 April 2024). ERIS provides a 45% enhanced deduction plus a 14.5% payable credit for loss-making companies, giving a net cash benefit of around 27% of qualifying R&D spend. This is particularly valuable for pre-revenue or early-stage companies with significant R&D costs.

Making an R&D Tax Credit Claim

R&D tax credit claims are made through your Company Tax Return (CT600) submitted to HMRC. Since August 2023, all first-time claimants and those with a gap in claiming must submit an Additional Information Form (AIF) before the CT600, providing details of projects, qualifying costs, and the advance in science or technology being sought.

HMRC has increased its scrutiny of R&D claims following a significant rise in fraudulent and inflated claims. Ensure your claim is based on contemporaneous project documentation, accurately calculated costs, and a genuine technical narrative. Using an R&D specialist accountant can help, but you remain responsible for the accuracy of your claim. HMRC can open compliance checks up to four years after a claim and can investigate further back if it suspects fraud. Keep detailed records of all R&D activity and expenditure.

Frequently asked questions

Can a sole trader claim R&D tax credits?
No. R&D tax credits are only available to companies subject to Corporation Tax. Sole traders and partnerships pay Income Tax rather than Corporation Tax and cannot claim R&D tax credits. If you are a sole trader doing significant R&D, consider whether incorporation makes sense for your business.
Can I claim for R&D done by contractors or subcontractors?
Yes, partially. Under the merged scheme, 65% of qualifying subcontracted R&D costs are eligible where the subcontractor is unconnected to the claimant. Where the subcontractor is connected (such as a subsidiary or parent company), costs are calculated differently. Contractor costs where you are engaged as an R&D subcontractor are not eligible.
How long does HMRC take to process an R&D claim?
HMRC's published processing time is 28 days for straightforward claims. In practice, claims subject to additional information requests or compliance checks take longer — often 3–6 months. HMRC has invested in additional compliance resources, and the AIF requirement means more data is reviewed before payment.

What to do next

  1. 1
    Read HMRC's R&D guidance

    Official HMRC guidance on R&D tax relief for companies.

  2. 2
    Submit your Additional Information Form

    Required for all new and lapsed R&D claimants before submitting a CT600.

  3. 3
    Find an R&D specialist accountant

    ICAEW guidance on choosing a specialist to support your R&D claim.

Official bodies and resources

HM Revenue & Customs

Government

Responsible for collecting taxes, paying some forms of state support, and administering national insurance.

Companies House

Government

Incorporates and dissolves limited companies, registers company information, and makes it available to the public.

Citizens Advice

Charity

Provides free, confidential, and independent advice on a wide range of issues including benefits, housing, debt, and employment.

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Disclaimer

This information is for general guidance only and does not constitute legal advice. You should seek qualified legal help if your situation requires it.