How to File a CT600 Online — Step by Step Guide
Learn how to file your CT600 corporation tax return online step by step. Plain English guide covering deadlines, common mistakes and what you need to start.
Plain-English guides to UK Corporation Tax and CT600 filing.
Learn how to file your CT600 corporation tax return online step by step. Plain English guide covering deadlines, common mistakes and what you need to start.
Complete checklist of records and documents needed for CT600 filing. How long to keep them, what HMRC expects, and how to organize everything.
Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.
When is your CT600 due? Your company tax return deadline is 12 months after the accounting period ends. Late filing means automatic penalties.
Honest assessment of when you need an accountant for CT600 filing vs when you can do it yourself. Costs, complexity, and decision factors explained.
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.