HMRC Free CT600 Filing Service Closing March 2026: What You Need to Do
HMRC is closing its free Corporation Tax filing service on 31 March 2026. What this means for your company and how to prepare.
Plain-English guides to UK Corporation Tax and CT600 filing.
HMRC is closing its free Corporation Tax filing service on 31 March 2026. What this means for your company and how to prepare.
How to claim Annual Investment Allowance on your CT600. £1 million limit, qualifying assets, how to calculate, and common mistakes.
Your Unique Taxpayer Reference (UTR) explained — what it is, where to find it, how it differs from your company number, and why you need it for CT600 filing.
What happens if HMRC opens an enquiry into your CT600. Your rights, the process, time limits, and how to respond.
All the ways to pay your Corporation Tax to HMRC — bank transfer, direct debit, online, and by post. Processing times and payment references explained.
The small profits rate, marginal relief band, and how to check which rate applies to your company. Updated for the 2025/26 tax year.
When to pay Corporation Tax, how to pay HMRC, payment reference numbers, and the consequences of late payment. Complete guide for limited companies.
Guide to filing your Companies House confirmation statement — what it is, when it's due, what information you need, and the difference from annual accounts.
How to file dormant company accounts with Companies House and a nil CT600 with HMRC. Step-by-step guide with deadlines and requirements.
Complete guide to HMRC penalties for Corporation Tax — late filing (£100 to £1,500+), late payment interest, and inaccuracy penalties. How to avoid them.
Complete guide to claiming trading loss relief on your CT600 — carry back, carry forward, group relief, and terminal loss relief explained with examples.
Got a dormant company? You still need to file a CT600. This 2026 guide shows you how to file a nil return in 15 minutes — even without HMRC's free service.