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UK corporation tax - ERIS: enhanced R&D relief for loss-making R&D-intensive SMEs from 1 April 2024 (eligibility, rates, intensity test, PAYE/NIC cap and claim requirements)

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Practice notes
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Enhanced relief for R&D-intensive loss-making SMEs (post-1 April 2024) FORTHCOMING CHANGE: R&D tax reliefs advance clearances:

Following a first announcement at Autumn Budget 2024 within the government’s Corporate Tax Roadmap, and a consultation issued at Spring Statement 2025, Budget 2025 set out the consultation outcome confirming a pilot of a targeted R&D advance assurance service. This will cover specified aspects of small and medium-sized enterprises’ R&D claims and is scheduled to commence from spring 2026. The pilot will run alongside the current R&D advance assurance.

This Practice Note covers the enhanced research and development (R&D)-intensive support (ERIS) for R&D‑intensive, loss-making SMEs, applying to accounting periods starting on or after 1 April 2024, subject to transitional provisions.

For details of the merged R&D expenditure credit generally applicable for accounting periods beginning on or after 1 April 2024 (the merged RDEC), see Practice Note: The merged R&D expenditure credit (post-1 April 2024). Alongside ERIS, these are referred to here as the post-1 April 2024 schemes. For information on the R&D expenditure credit that applies to accounting periods beginning before 1 April 2024, see Practice Note: R&D expenditure credit (pre-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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