Understanding Research and Development (R&D) Tax Credits
Research and Development (R&D) tax credits are a UK government incentive designed to encourage innovation. Companies that invest in developing new products, processes, or services — or improving existing ones — can claim enhanced tax relief or, if loss-making, a cash payment from HMRC. The relief can be substantial and is often unclaimed by businesses that do not realise they qualify.
Who Can Claim?
R&D tax credits are available to UK limited companies subject to Corporation Tax. Sole traders and partnerships do not qualify (though their associated limited companies may). The company must be carrying out qualifying R&D — this does not require a dedicated research laboratory. Software development, engineering improvements, new manufacturing processes, and product innovations can all qualify.
What Qualifies as R&D?
HMRC's definition is based on the Department for Science, Innovation and Technology (DSIT) guidelines. R&D occurs when a company seeks to achieve an advance in science or technology through a project that tries to resolve a scientific or technological uncertainty. The uncertainty must be one that a competent professional in the field could not readily resolve. Routine software updates, minor product modifications, or market research do not qualify. However, a company developing a new algorithm, creating a novel engineering solution, or undertaking clinical trials typically would.
The Two Schemes (Merged from April 2024)
Prior to April 2024, there were two separate schemes: the SME scheme (for companies with fewer than 500 employees and either turnover under €100m or balance sheet under €86m) and the Research and Development Expenditure Credit (RDEC) scheme (for large companies and SMEs subcontracting to large companies). From April 2024, these merged into a single enhanced RDEC scheme for most companies, with a retained SME intensive scheme for R&D-intensive SMEs spending at least 30% of total expenditure on R&D.
The Enhanced RDEC Scheme (from April 2024)
The merged scheme provides a taxable credit of 20% of qualifying R&D expenditure. This credit is offset against your Corporation Tax liability. If you are loss-making and the credit exceeds your CT liability, the excess is paid as cash, subject to a PAYE/NI cap. The effective benefit after Corporation Tax is approximately 15–16% of qualifying expenditure.
The SME Intensive Scheme
R&D-intensive SMEs (spending at least 30% of total expenditure on R&D) can claim under the enhanced SME scheme — an additional deduction of 86% of qualifying expenditure plus a credit of 10%, or for loss-making companies, a cash credit at an effective rate of approximately 26.97% of qualifying R&D spend.
What Counts as Qualifying Expenditure?
Staff costs (wages, employer NI, and pension contributions for employees directly engaged in R&D and their supervisors), subcontractor costs (65% of qualifying payments), software and data licences, consumables (materials and utilities used in R&D), cloud computing costs (from April 2023), and clinical trial volunteers' costs.
How to Claim
R&D tax credits are claimed through your Corporation Tax return (CT600) with a supplementary R&D report. HMRC introduced advance notification requirements from August 2023 — for accounting periods beginning on or after 1 April 2023, you must notify HMRC of your intention to claim within 6 months of the accounting period end if it is your first claim or you have not claimed in the previous 3 years.
