Which scheme applies.
For accounting periods beginning on or after 1 April 2024, most companies use the merged R&D scheme. Loss-making, R&D-intensive SMEs may qualify for enhanced R&D intensive support.
Older accounting periods can fall under the previous SME or RDEC rules, so the accounting-period start date matters.
What counts as qualifying work.
The project must seek an advance in science or technology and try to resolve a technological uncertainty that a competent professional could not readily resolve.
A new product or feature is not enough on its own. Describe the technical uncertainty, the work carried out and what the team learned.
Costs and records.
Review staff costs, externally provided workers, subcontractors, software, data and consumables against the current rules. Keep project notes, timesheets, invoices, payroll records and evidence of the technical decision-making.
Before you claim.
Check whether the company needs an advance notification, whether the claim deadline has passed and whether the figures reconcile to the accounts. HMRC can ask for a detailed explanation of the project and costs.
Official sources.
Check the current guidance before you rely on a rate, threshold, deadline or relief.
Have a project that may qualify for R&D relief?
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