Best CT600 Filing Software UK 2026 — Compared
HMRC's free filing tool closes March 2026. Compare the best CT600 filing software options — prices, features, and which one suits your company.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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What Happens If You Don't File Corporation Tax? Penalties, Interest, and How to Fix It
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.
How to Register for Corporation Tax: Step-by-Step Guide for New Companies
Complete guide to registering your limited company for corporation tax with HMRC. Deadlines, what you need, UTR numbers, and what happens after registration.
How to Amend a CT600 — Correcting Mistakes on Your Corporation Tax Return
Filed your CT600 and spotted an error? Here's how to amend your Corporation Tax return, the time limits, and what happens if HMRC finds the mistake first.
Dormant Company CT600 Filing: Do You Still Need to File? (Yes — Here's How)
Your dormant company still needs to file a CT600 with HMRC. Learn what counts as dormant, how to file, and the fastest way to stay compliant for just £59.
How to Pay Corporation Tax to HMRC — All Payment Methods Explained
Step-by-step guide to paying your Corporation Tax bill. Bank details, payment references, deadlines, and what happens if you pay late.
What Records Do I Need for My Company Tax Return?
Complete checklist of records and documents needed for CT600 filing. How long to keep them, what HMRC expects, and how to organize everything.
CT600 Penalties: What Happens If You File Late?
Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.
What Is a CT600? The Plain English Guide for Company Directors
A jargon-free explanation of the CT600 Corporation Tax return — what it is, who needs to file one, what goes in it, and how to submit it to HMRC.
HMRC Free Filing Ended March 2026 — What You Need to Know
HMRC shut down its free CT600 filing service on 31 March 2026. Here's what changed, why it matters, and what your options are going forward.