Construction Industry Scheme (CIS) & Corporation Tax: CT600 Guide
How CIS deductions work for limited companies, claiming CIS repayments on your CT600, and the interaction between CIS and Corporation Tax.
Plain-English guides to UK Corporation Tax and CT600 filing.
How CIS deductions work for limited companies, claiming CIS repayments on your CT600, and the interaction between CIS and Corporation Tax.
Guide to claiming creative industry tax reliefs on your CT600 — film, TV, video games, animation, theatre, orchestra, and museums.
How the Patent Box regime lets UK companies pay only 10% Corporation Tax on profits from patented inventions. Eligibility, calculation, and CT600 reporting.
Complete guide to claiming trading loss relief on your CT600 — carry back, carry forward, group relief, and terminal loss relief explained with examples.
How limited companies report capital gains on the CT600, including indexation allowance, the substantial shareholding exemption, and which boxes to complete.
Just incorporated a limited company? This plain-English guide covers everything new directors need to know about filing their first CT600 in 2026.
Got a dormant company? You still need to file a CT600. This 2026 guide shows you how to file a nil return in 15 minutes — even without HMRC's free service.
Marginal relief reduces your corporation tax if profits are between £50k and £250k. Step-by-step calculation with real examples for 2024-25 CT600 returns.
HMRC's free CT600 service closes March 2026. Step-by-step guide to filing your corporation tax return from April 2026 using commercial software.
HMRC's free CT600 filing service ends 31 March 2026. Here's exactly what to do if you've just found out — step-by-step, no panic required.
Just incorporated a UK limited company? Here's everything you need to know about filing your first CT600 Corporation Tax return — from registering with HMRC to submitting your return.
Miss your CT600 deadline and HMRC charges escalating penalties from £100 to 10% of unpaid tax. Learn the exact penalty structure, appeal options, and how to file on time.