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

182 results for “CT600”Clear search
21 February 2026

Company Tax Return (CT600) vs Annual Accounts: What's the Difference?

CT600 vs annual accounts: one goes to HMRC, one to Companies House. What each is, when they are due, and how they relate.

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21 February 2026

How to Appeal a CT600 Late Filing Penalty from HMRC

Got a CT600 late filing penalty? You may be able to appeal. Step-by-step guide to HMRC penalty appeals, reasonable excuses, and time limits.

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21 February 2026

How to File Your CT600 Yourself in 2026 (Complete DIY Guide)

File your CT600 without an accountant in 2026. What you need, how to prepare accounts, calculate tax, and submit to HMRC.

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21 February 2026

CT600 for Contractors: Filing When You're Inside or Outside IR35

How IR35 status affects your CT600. Practical guide for contractors filing corporation tax — inside IR35, outside IR35, or mixed.

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21 February 2026

Do I Need to File a CT600? When Your Company Must Submit a Tax Return

Find out whether your limited company needs to file a CT600 Corporation Tax return with HMRC. Covers dormant companies, new companies, losses, and exemptions.

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21 February 2026

CT600 vs Self Assessment: What's the Difference? (Company vs Personal Tax)

CT600 vs Self Assessment: the key differences between company tax returns and personal tax returns. Who files which and why.

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21 February 2026

Corporation Tax for Startups: The Complete Guide for New Limited Companies

Corporation tax for startups. Registration, deadlines, expenses, R&D relief, first CT600 filing, and mistakes to avoid.

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21 February 2026

Changing Your Company's Accounting Period: How It Affects Your CT600

What happens to your CT600 when you change your accounting period? Guide to the rules, restrictions, and filing implications.

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21 February 2026

Corporation Tax Refund: How to Claim Back Overpaid Tax from HMRC

How to claim a corporation tax refund from HMRC. Covers overpayment, amended returns, loss carry-back, and how long refunds take.

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21 February 2026

Marginal Relief for Corporation Tax: How It Works (With Calculation Examples)

How marginal relief works for Corporation Tax in 2025/26. Step-by-step calculation for profits between £50,000 and £250,000.

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21 February 2026

HMRC Free CT600 Filing Ends March 2026: Your 5 Best Alternatives

HMRC free CT600 filing ends 31 March 2026. Compare the best alternatives by price, features, and ease of use.

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21 February 2026

Corporation Tax on Cryptocurrency: How to Report Bitcoin & Crypto on Your CT600

How UK companies pay corporation tax on crypto. Buying, selling, mining, staking, DeFi, and NFTs — what goes on your CT600.

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