Can a previous R&D tax credit claim be reused?

It is common for research and development projects to continue over more than one accounting period. A project doesn’t need to be completed before a company decides to claim R&D tax credits. If qualifying activity continues into later accounting periods, you may be able to include the relevant activities and eligible expenditure in each year’s claim. 

Each R&D tax relief claim is assessed independently. You cannot simply repeat or recycle information from a previous submission. For each accounting period, companies must be able to demonstrate that the qualifying research and development activities undertaken during that accounting period meet the legislative definition of R&D for tax purposes. The eligible expenditure incurred within that accounting period must also be clearly identified. 

Where a project continues over several years, HMRC expects businesses to explain how the work progressed. This includes describing the technological or scientific uncertainties that remained, the advances being sought, and the qualifying activities carried out to resolve those uncertainties. If the uncertainty has already been resolved, routine development, optimisation or commercial rollout would not normally qualify for further R&D tax relief. 

It is also important to understand that R&D claim eligibility can change as a project progresses. Early stages may involve genuine technological uncertainty and qualifying R&D activities. Later stages may consist mainly of testing, production, maintenance or implementation. Those activities are not automatically eligible simply because they form part of the same commercial project. 

For this reason, each claim should be supported by contemporaneous project records, technical evidence where available, and a clear breakdown of qualifying expenditure for the relevant accounting period. This allows HMRC to assess each claim on its own merits, while recognising that a single R&D project may legitimately span multiple years.