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.
Plain-English guides to UK Corporation Tax and CT600 filing.
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 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.
Understand corporation tax rates for small companies in 2025/2026, including the 19% and 25% thresholds, marginal relief calculation, and associated companies rules.
New limited company? Learn when to register for corporation tax, your first accounting period, filing deadlines, and how to avoid common first-year mistakes.
Understand how a director's loan account affects your corporation tax, including the S455 charge at 33.75%, repayment rules, and CT600 reporting.
Overpaid corporation tax? Learn how to claim a refund from HMRC, amend your CT600, and understand timelines for getting your money back.
Step-by-step guide to setting up and using your HMRC Government Gateway account to file your CT600 Corporation Tax Return online.
Is employer NIC an allowable deduction for corporation tax? Yes. Learn how employer National Insurance works, current rates, the Employment Allowance, and how to claim on your CT600.
Owe money to your company? Learn how an overdrawn director's loan account triggers S455 tax on your CT600, how much you'll pay, and how to get it back.
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.
Buy an electric car through your company and claim 100% first-year allowance. Learn about BIK rates, capital allowances, and CT savings for EVs in 2025/26.
Should you hold buy-to-let property in a limited company? Complete guide to corporation tax on rental income, mortgage interest relief, and when a company structure makes sense.