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UK R&D tax relief: qualifying expenditure, contracted-out R&D and overseas restrictions under merged RDEC and ERIS (from 1 April 2024)

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Practice notes
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Qualifying R&D expenditure (post-1 April 2024) FORTHCOMING CHANGE: R&D tax reliefs advance clearances:

Following an initial announcement at Autumn Budget 2024 within the government’s Corporate Tax Roadmap, and a consultation released at Spring Statement 2025, Budget 2025 confirmed the consultation outcome: a targeted R&D advance assurance pilot for specified elements of R&D claims by small and medium-sized enterprises will commence from spring 2026. This pilot will operate alongside the existing R&D advance assurance. For further details, see News Analysis: Budget 2025—Tax analysis.

This Practice Note explains the scope of qualifying expenditure for the two R&D relief schemes below (both subject to detailed commencement and transitional rules):

  • the merged R&D expenditure credit (the merged RDEC) for accounting periods beginning on or after 1 April 2024—see Practice Note: The merged R&D expenditure credit (post-1 April 2024); and
  • the enhanced relief for loss-making R&D-intensive SMEs (the ERIS) for accounting periods beginning on or after 1 April 2024—see Practice Note: Enhanced relief for R&D-intensive loss-making SMEs (post-1 April 2024)

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David O’Keeffe
David O’Keeffe

I am an independent specialist adviser on the taxation of innovation, advising companies and other advisers on areas such as R&D tax relief, Patent Box and Creative Industry reliefs.  I am a member of the London Society of Chartered Accountants’ tax committee as well as CIOT’s Corporation Tax technical Committee (and chair the R&D Working Group of that committee)....

Web page updated on 22/05/2026

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