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.
Plain-English guides to UK Corporation Tax and CT600 filing.
Find out whether your limited company needs to file a CT600 Corporation Tax return with HMRC. Covers dormant companies, new companies, losses, and exemptions.
How IR35 status affects your CT600. Practical guide for contractors filing corporation tax — inside IR35, outside IR35, or mixed.
Received an HMRC enquiry about your CT600? What triggers enquiries, your rights, what HMRC can ask, and how to respond.
New limited company timeline: when to register for corporation tax, your first accounting period, CT600 deadline, and payment date.
HMRC free CT600 filing ends 31 March 2026. Compare the best alternatives by price, features, and ease of use.
What happens to your CT600 when you change your accounting period? Guide to the rules, restrictions, and filing implications.
How to use corporation tax group relief to share losses between companies. 75% ownership test, consortium relief, and filing.
CT600 supplementary pages explained: CT600A to CT600E. Find out which ones your company needs and how to complete them.
Free CT600 filing software compared. What happens when HMRC stops free filing in March 2026 and what to use instead.
HMRC charges interest on late corporation tax at base rate + 2.5%. Learn current rates, how interest is calculated, and how to avoid it.
Making Tax Digital is coming for corporation tax. Learn what changes to expect, likely timelines, and how to prepare your company.
How UK companies pay corporation tax on crypto. Buying, selling, mining, staking, DeFi, and NFTs — what goes on your CT600.