How to Correct a CT600 Mistake: Amending Your Corporation Tax Return
Made an error on your CT600? Learn exactly how to amend your corporation tax return, HMRC time limits, penalties for mistakes, and how to fix common CT600 errors step by step.
Plain-English guides to UK Corporation Tax and CT600 filing.
Made an error on your CT600? Learn exactly how to amend your corporation tax return, HMRC time limits, penalties for mistakes, and how to fix common CT600 errors step by step.
Missed your CT600 deadline? Learn the exact HMRC penalty structure — £200 initial then 10% and a further 10% for filing dates from April 2026 — how late payment interest works at 7.75%, and the steps to fix it fast. Plus how to appeal.
Compare CT600 filing costs in 2026: Taxpipe at £59 vs accountants at £200-500+ vs HMRC's free service (closed 31 March 2026). Real prices, real scenarios, real savings.
HMRC's free CT600 filing service closed permanently on 31 March 2026. Here's your complete action plan — deadlines, penalties, and the most affordable alternative at £59.
HMRC's free filing service closed on 31 March 2026. Here's exactly how to file your CT600 corporation tax return online in 2026 — step by step, with tips and common mistakes to avoid.
HMRC's free Corporation Tax Online service closed 31 March 2026. Here's what changed and the cheapest ways to file your CT600 now that the free option is gone.
HMRC requires iXBRL for CT600 accounts and tax computations. What is it, why does it matter, and how do you create it? Plain English guide for directors.
Overpaid corporation tax? Learn how to claim a refund from HMRC, how long it takes, and what to do if your refund is delayed.
Filed your CT600? Here's what happens next — HMRC processing times, status updates, potential enquiries, and when to expect confirmation.
Step-by-step guide to paying your corporation tax bill. Covers all payment methods, deadlines, payment references, and what happens if you pay late.
Made an error on your CT600? Learn how to amend your corporation tax return within the 12-month deadline, what changes HMRC allows, and the step-by-step process.
HMRC's free CT600 filing service closed on 31 March 2026. Step-by-step guide to choosing a replacement and filing your Corporation Tax return.