R&D tax relief administration, interaction with other reliefs and anti-avoidance

Produced by Tolley in association with Will Sweeney

Corporation Tax

Guidance

Autumn Budget 2026

R&D tax relief administration, interaction with other reliefs and anti-avoidance

Produced by Tolley in association with Will Sweeney

Corporation Tax

Guidance

Autumn Budget 2026

This guidance note provides details of the administration of research and development (R&D) tax relief claims, the interaction with other tax provisions and anti-avoidance rules. For further details of the operation of the schemes, see the Research and development SME tax reliefs and Research and development expenditure credit (RDEC) guidance notes.

As part of Budget 2026, the Government announced that the requirement to submit a claim notification form will be abolished for R&D claims made on or after 1 April 2027. The information required in the additional information form will also be simplified from autumn 2027. For further details, see ‘Requirement to notify HMRC’ and ‘Additional information form for R&D claims’ below.

Claims for R&D tax relief

Claims for R&D tax relief must be made by including the claim in the company’s tax return (CT600), either in the original submitted return or through an amended return. The time limit for submission of the claim is as follows:

•
for accounting periods beginning before 1 April 2023, the R&D claim must be submitted

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Will Sweeney

Senior R&D Manager, Menzies LLP , Corporate Tax

Will Sweeney is a Senior R&D Manager in the Innovation & R&D team at Menzies where he looks after many of their largest clients. He has extensive experience of helping entrepreneurial clients to optimise their tax position throughout the innovation lifecycle by advising on issues including R&D tax credits, RDEC, Creative Sector reliefs and the Patent Box.In addition to his tax knowledge, Will started his career as an engineer and has worked with numerous technology, manufacturing and property sector clients. He brings a wealth of industry experience to his clients, helping him to understand the specific technical details of work undertaken by clients.Will contributes to TolleyGuidance Corporate module.

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R&D tax relief administration, interaction with other reliefs and anti-avoidance