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Plain-English guides to UK Corporation Tax and CT600 filing.

19 results for “mistakes”Clear search
21 February 2026

Corporation Tax for Startups: The Complete Guide for New Limited Companies

Corporation tax for startups. Registration, deadlines, expenses, R&D relief, first CT600 filing, and mistakes to avoid.

corporation taxstartuplimited companyCT600new business
20 February 2026

How to File Your CT600 Without an Accountant — Complete Guide

Step-by-step guide to filing your CT600 without an accountant. What you need, how to calculate tax, and how to avoid mistakes.

CT600self-filingcorporation taxno accountantDIY tax returnsave money
20 February 2026

Closing a Limited Company — Your Final CT600 and What to Do

Step-by-step guide to closing your limited company. Final CT600, capital distributions, strike-off vs MVL, and the mistakes that cost directors money.

closing companyfinal CT600strike offMVLcorporation taxlimited company
19 February 2026

Annual Investment Allowance (AIA): Claim Up to £1 Million in Tax Relief

How to claim AIA on your CT600 for plant and machinery purchases. What qualifies, what doesn't, and common mistakes that cost small companies money.

capital allowancesAIAplant and machineryCT600tax reliefcorporation taxfull expensing
19 February 2026

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.

CT600amendmentscorporation taxHMRCmistakes
19 February 2026

10 Common CT600 Mistakes (and How to Avoid Them)

The most frequent errors company directors make when filing their CT600. From wrong dates to missing boxes — and how to get it right first time.

ct600mistakescorporation taxfiling tips
12 February 2026

How to File a CT600 Online — Step by Step Guide

Learn how to file your CT600 corporation tax return online step by step. Plain English guide covering deadlines, common mistakes and what you need to start.

CT600GuideFiling
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