Do I Need to File a CT600 If My Company Made No Profit?
Yes — even if your company made no profit, you almost certainly need to file a CT600. Learn about nil returns, dormant companies, and how to file for £59.
Plain-English guides to UK Corporation Tax and CT600 filing.
Yes — even if your company made no profit, you almost certainly need to file a CT600. Learn about nil returns, dormant companies, and how to file for £59.
Missed your CT600 deadline? Learn the exact penalty amounts (£100, £200, 10%, 20%), how interest is calculated, and the steps to fix it fast. Plus how to appeal.
Never filed a CT600 before? This step-by-step guide explains everything first-time directors need to know — deadlines, documents, iXBRL, and how to file for £59.
HMRC's free filing service closes 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.
Full expensing lets your company deduct 100% of qualifying plant and machinery costs immediately. Here's who qualifies, what's included, and how to claim on your CT600.
Box 155 is the most important number on your CT600. Learn exactly what trading profits means, how to calculate it, and common mistakes to avoid.
Overpaid corporation tax? Learn how to claim a refund from HMRC, how long it takes, and what to do if your refund is delayed.
Filing your own CT600? Avoid these 12 costly mistakes that catch first-time filers. From wrong accounting periods to missed reliefs — save time and tax.
Just incorporated? Here's your complete guide to corporation tax in your first year — registration, deadlines, what to file, and how to pay.
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.
How to carry forward trading losses on your CT600 to reduce future corporation tax bills. Box references, time limits, and practical examples.