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File your UK Corporation Tax CT600 return online. Simple, affordable, HMRC-compliant.

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Plain-English guides to UK Corporation Tax and CT600 filing.

88 results for “Guide”Clear search
19 February 2026

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.

ct600new companyfirst tax returncorporation taxbeginners
12 February 2026

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.

CT600GuideFiling
12 February 2026

CT600 Penalties: What Happens If You File Late?

Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.

ct600penaltieslate filingHMRC
11 February 2026

What Is a CT600? The Plain English Guide for Company Directors

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.

ct600corporation taxbeginners
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