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

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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

Corporation Tax Rates 2025/26 - Marginal Relief Calculator

Current UK corporation tax rates and marginal relief.

Corporation TaxTax Rates
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.

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