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.
Plain-English guides to UK Corporation Tax and CT600 filing.
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.
Step-by-step guide to paying your Corporation Tax bill. Bank details, payment references, deadlines, and what happens if you pay late.
Your dormant company still needs to file a CT600 with HMRC. Learn what counts as dormant, how to file, and the fastest way to stay compliant for just £59.
Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.
Complete checklist of records and documents needed for CT600 filing. How long to keep them, what HMRC expects, and how to organize everything.
A jargon-free explanation of the CT600 Corporation Tax return — what it is, who needs to file one, what goes in it, and how to submit it to HMRC.
HMRC is shutting down its free CT600 filing service in March 2026. Here's what's changing, why it matters, and what your options are going forward.