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R&D Tax Credit Calculator

Last updated: April 2026

Company Details

SME definition: fewer than 500 employees and turnover under EUR100m (approximately £86m) or balance sheet under EUR86m.

Expenditure

All costs including salaries, rent, materials — used to calculate R&D intensity.

£

Gross salaries, employer NI and pension contributions for staff directly engaged in R&D.

£

Payments to third parties carrying out R&D on your behalf. Only 65% qualifies under post-2024 rules.

£

Software licences and subscriptions used directly in R&D.

£

Raw materials consumed or transformed in the R&D process.

£

Heat, light, and power used in R&D activities.

£

Cloud computing and data hosting costs for R&D, qualifying from April 2023.

£

Corporation Tax Rate

R&D Intensity

Total qualifying R&D spend£100,000
Total company expenditure£500,000
R&D intensity20.00%

Standard rate applies

Merged RDEC scheme

Estimated cash benefit

£5,000

Benefit Breakdown

Qualifying expenditure£100,000
Staff (100%)£100,000
Subcontractors (65%)£0
Other (100%)£0
Credit rate20%
R&D expenditure credit£20,000
Corporation tax saving£5,000
Effective rate5.00%

Scheme Comparison

Merged SchemeIntensive SME
Qualifying£100,000£100,000
Credit rate20%27% approx
Cash benefit£5,000£14,500

This is an estimate only.

R&D tax credit claims require a technical narrative describing qualifying activities, which must meet HMRC's definition of R&D under the guidelines. Incorrect or unsupported claims can result in penalties. We strongly recommend using a specialist R&D tax adviser for your claim.

We may receive a referral fee.

What changed in April 2024?

From 1 April 2024, the previous SME R&D scheme and the Research and Development Expenditure Credit (RDEC) scheme merged into a single scheme. The merged scheme pays a 20% credit on qualifying R&D expenditure. A separate enhanced scheme remains for R&D-intensive SMEs, those spending at least 30% of their total costs on R&D.

What qualifies as R&D for tax purposes?

HMRC uses a broad definition of R&D based on guidelines from the Department for Science, Innovation and Technology. Qualifying R&D must seek to achieve an advance in science or technology and involve overcoming scientific or technological uncertainty. This includes software development, product development, and process innovation, not just laboratory research.

What costs can I include?

Qualifying costs include staff salaries, employer NI and pension contributions for employees directly working on R&D, 65% of payments to subcontractors, software used in R&D, materials consumed in the R&D process, utilities, and cloud computing costs from April 2023 onwards. Costs must be revenue expenditure because capital costs do not qualify.

How do I make a claim?

R&D tax credit claims are made through your company tax return (CT600) submitted to HMRC. You must include a technical narrative describing the qualifying R&D activities. Claims can be made up to two years after the end of the accounting period. HMRC has increased scrutiny of R&D claims significantly since 2022, so ensure your claim is well documented.

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