Your First Company Tax Return — A New Director's Guide to CT600 Filing
Just set up a limited company? Everything you need to know about your first CT600 — when it is due, what to include, and how to file.
Plain-English guides to UK Corporation Tax and CT600 filing.
Just set up a limited company? Everything you need to know about your first CT600 — when it is due, what to include, and how to file.
The most frequent errors company directors make when filing their CT600. From wrong dates to missing boxes — and how to get it right first time.
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.
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.
Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.
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 shut down its free CT600 filing service on 31 March 2026. Here's what changed, why it matters, and what your options are going forward.