Corporation Tax Allowable Expenses — The Complete List for Small Companies
Complete list of expenses your limited company can claim against Corporation Tax — from office costs to travel, with real examples.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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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.
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.
Corporation Tax Rates 2025/26 - Marginal Relief Calculator
UK corporation tax rates for 2025/26: 19% small profits rate, 25% main rate, and how marginal relief works for profits between £50,000 and £250,000.
HMRC Free Filing Ended March 2026 — What You Need to Know
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.
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.