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

3 results for “amendments”Clear search
22 February 2026

How to Correct a CT600 Mistake: Amending Your Corporation Tax Return

Made an error on your CT600? Learn exactly how to amend your corporation tax return, HMRC time limits, penalties for mistakes, and how to fix common CT600 errors step by step.

ct600amendmentshmrccorporation taxpenalties
22 February 2026

How to Amend a CT600 Tax Return: Correcting Mistakes After Filing

Made an error on your CT600? Learn how to amend your corporation tax return within the 12-month deadline, what changes HMRC allows, and the step-by-step process.

CT600HMRCamendmentscorporation taxtax return corrections
19 February 2026

How to Amend a CT600 — Correcting Mistakes on Your Corporation Tax Return

Filed your CT600 and spotted an error? Here's how to amend your Corporation Tax return, the time limits, and what happens if HMRC finds the mistake first.

CT600amendmentscorporation taxHMRCmistakes