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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Plain-English guides to UK Corporation Tax and CT600 filing.
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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.
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.
Non-UK Company Trading in the UK? When You Need to Pay Corporation Tax
Non-UK company with UK activities? When you must register for corporation tax, file a CT600, and what counts as a permanent establishment.
Free CT600 Filing Software: What Are Your Options in 2026?
Free CT600 filing software compared. HMRC's free filing service closed in March 2026 — here's what it offered and what to use instead.
HMRC Enquiry Into Your CT600: What to Expect and How to Respond
Received an HMRC enquiry about your CT600? What triggers enquiries, your rights, what HMRC can ask, and how to respond.
Corporation Tax Group Relief: How to Share Losses Between Companies
How to use corporation tax group relief to share losses between companies. 75% ownership test, consortium relief, and filing.
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.
CT600 Supplementary Pages Explained: Which Ones Does Your Company Need?
CT600 supplementary pages explained: CT600A through CT600P. Find out which ones your company needs and how to complete them.
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.
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.
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.