Accounting Periods Explained — When Does Your Corporation Tax Year Start and End?
What is an accounting period for Corporation Tax? How to work out your dates, what happens in your first year, and how periods affect your CT600 deadlines.
Plain-English guides to UK Corporation Tax and CT600 filing.
What is an accounting period for Corporation Tax? How to work out your dates, what happens in your first year, and how periods affect your CT600 deadlines.
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 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.
Complete checklist of records and documents needed for CT600 filing. How long to keep them, what HMRC expects, and how to organize everything.
Honest assessment of when you need an accountant for CT600 filing vs when you can do it yourself. Costs, complexity, and decision factors explained.
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.
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.