Plain-English guides to UK Corporation Tax and CT600 filing.
A plain-English guide to filling in your company balance sheet for Companies House filing. Covers micro-entity and dormant companies with real examples and what each field means.
How to claim capital allowances on your CT600 for equipment, vehicles, and machinery. Covers AIA, writing down allowances, full expensing, and which CT600 boxes to use.
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.
Marginal relief reduces corporation tax for companies with profits between £50,000 and £250,000. Learn how it works, how to calculate it, and how it appears on your CT600.
If HMRC has asked your dormant company for a return, you still need to file a CT600. Here's how to file a nil return quickly and avoid penalties — even if your company did nothing all year.
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 discontinued 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: from 1 April 2026, £200 on day one and £400 at 3 months — doubled from previous rates. Plus 10% tax-geared penalties and 7.75% late payment interest. How to minimise the damage.
Plain English explanation of iXBRL — the tagged format HMRC requires for CT600 accounts and tax computations. What it is, why it matters, and how to create it.
Step-by-step guide to setting up and using HMRC Government Gateway for Corporation Tax. How to register, enrol for CT, view your account, and manage your tax.
How SME R&D tax relief works for small companies. Qualifying activities, how to calculate the benefit, and reporting on your CT600.