UK Company Tax Return: The Complete Beginner's Guide (2025)
Everything a new limited company director needs to know about filing a company tax return (CT600) with HMRC. From registration to submission, step by step.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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File CT600 After HMRC Free Service Closes (2026)
HMRC's free CT600 service closes March 2026. Step-by-step guide to filing your corporation tax return from April 2026 using commercial software.
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.
Filing CT600 Without an Accountant: Is It Safe? A Step-by-Step Guide
Can you safely file your CT600 without an accountant? Yes for simple companies. When DIY filing is safe, when to get help, and how to do it step by step.
How to File CT600 Online in 2026: Complete Step-by-Step Guide
HMRC's free filing service closes March 2026. Here's exactly how to file your CT600 corporation tax return online in 2026 — step by step, with tips and common mistakes to avoid.
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.