Corporation Tax Deadlines 2026: When You Need to File and Pay
All corporation tax deadlines for 2026 — CT600 filing dates, payment due dates, and penalties for late filing. Key dates for UK limited companies.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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The Cheapest Way to File Your CT600 in the UK (2026)
Compare every option for filing your CT600 — from accountants to DIY software — ranked by cost. Find the cheapest way to file your company tax return.
Taxfiler vs Taxpipe: How They Compared (Taxfiler Now Discontinued)
Taxfiler was discontinued in March 2025. See how the two CT600 tools compared on price, features, and ease of use — and why Taxpipe is the natural replacement for directors filing their own returns.
First Year Corporation Tax: A Complete Guide for New Companies
New limited company? Learn when to register for corporation tax, your first accounting period, filing deadlines, and how to avoid common first-year mistakes.
How to Use HMRC Government Gateway to File Your CT600
Step-by-step guide to setting up and using your HMRC Government Gateway account to file your CT600 Corporation Tax Return online.
Close Company Rules & Corporation Tax Explained
Is your limited company a close company? Learn what it means for corporation tax, S455 tax on loans, and how it affects your CT600 filing.
Accountant vs DIY CT600 Filing: Honest Comparison
Should you pay an accountant or file your CT600 yourself? An honest comparison of costs, time, risks, and when each option makes sense for UK limited companies.
Company Formation & Corporation Tax Registration
Step-by-step guide to registering for Corporation Tax after forming a limited company. Covers CT41G, UTR numbers, deadlines, and first CT600 filing.
Corporation Tax Deadlines Calendar 2026
Full 2026 calendar of Corporation Tax deadlines — CT600 filing dates, payment due dates, penalty dates, and quarterly instalment dates month by month.
Corporation Tax for Investment Companies
How does corporation tax work for investment companies? Guide to holding investments through a limited company — dividends, capital gains, property, and filing your CT600.
Corporation Tax for Small Businesses: 2026
Complete 2026 guide to corporation tax for small businesses. Covers rates, allowable expenses, filing deadlines, payment dates, and tips to reduce your tax bill legally.
CT600 Filing Agent Authorisation with HMRC
How to authorise an agent to file your CT600. Step-by-step guide to HMRC agent authorisation for corporation tax — online, by post, and what to do if things go wrong.