Plain-English guides to UK Corporation Tax and CT600 filing.
HMRC charges escalating penalties for late CT600 filing, starting at £200 for filing dates on or after 1 April 2026. Here's exactly what happens, how to avoid penalties, and what to do if you've already missed the deadline.
Complete guide to HMRC penalties for Corporation Tax — late filing (from £100 fixed, rising to £200 for deadlines from April 2026, plus up to 20% of unpaid tax), late payment interest, and inaccuracy penalties. How to avoid them.
Miss your CT600 deadline and HMRC charges escalating penalties — from £200 on day one for filing dates from April 2026, rising to 10% of unpaid tax. Learn the full penalty structure, appeal options, and how to file on time.
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.
All corporation tax deadlines for 2026 — CT600 filing dates, payment due dates, and penalties for late filing. Key dates for UK limited companies.
What are the penalties for filing your CT600 late? Understand HMRC penalty rates, interest charges, and how to avoid or appeal late filing penalties.
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.
Understand HMRC corporation tax penalties for late filing and payment, how interest is calculated, and how to appeal. Complete guide for UK company directors.
Missed your CT600 deadline? Learn about HMRC late filing penalties (fixed penalties escalating to 10% tax surcharges), interest charges, how to appeal, and the fastest way to get back on track.
Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.
When is your CT600 due? Your company tax return deadline is 12 months after the accounting period ends. Late filing means automatic penalties.