Company Year End: 31 March vs Other Dates — How It Affects Your CT600
Does your company year end matter for corporation tax? Yes. Here's how 31 March simplifies your CT600 filing, and what happens with other year-end dates.
Plain-English guides to UK Corporation Tax and CT600 filing.
Does your company year end matter for corporation tax? Yes. Here's how 31 March simplifies your CT600 filing, and what happens with other year-end dates.
The CT600 has over 200 boxes but most companies only use a fraction. Here are the key boxes you need to know, what goes in each one, and common mistakes to avoid.
The CT600 has 200+ boxes but most companies only need about 30. Here's exactly which boxes matter for your company type — micro-entity, small, or dormant.
HMRC charges escalating penalties for late CT600 filing, starting at £100. Here's exactly what happens, how to avoid penalties, and what to do if you've already missed the deadline.
New company director? This beginner-friendly guide explains CT600 corporation tax returns: what they are, when to file, what you need, and how to do it yourself.
Step-by-step guide to filing your CT600 corporation tax return online using commercial software after HMRC discontinues its free filing service in March 2026.
Complete guide to filing a dormant company CT600. Even if your company did nothing, you still need to file. Here's exactly how.
Late CT600 filing penalties explained: £100 at 1 day late, £200 at 3 months, plus interest and tax-geared penalties. How to avoid them.
HMRC is closing its free Corporation Tax filing service on 31 March 2026. Here's what this means for your company and the cheapest alternatives.
HMRC is shutting down its free CT600 filing service on 31 March 2026. Here's what it means for your company and the cheapest alternatives.
Legitimate strategies to reduce your Corporation Tax bill before your year-end. Pension contributions, capital allowances, salary timing, and more.
The most common CT600 filing mistakes that cause HMRC rejections. Learn what to avoid so your Corporation Tax return gets accepted first time.