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Plain-English guides to UK Corporation Tax and CT600 filing.

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22 February 2026

Research & Development (R&D) Tax Credits on CT600: SME Guide 2026

Complete guide to claiming R&D tax credits on your CT600. Covers the merged R&D scheme, qualifying expenditure, CT600L supplementary page, HMRC compliance checks, and cash credits vs tax reduction.

ct600 R&D tax credits research and development CT600L corporation tax

21 February 2026

HMRC Enquiry Into Your CT600: What to Expect and How to Respond

Received an HMRC enquiry about your CT600? What triggers enquiries, your rights, what HMRC can ask, and how to respond.

ct600 hmrc enquiry tax investigation corporation tax hmrc compliance check