HMRC Enquiry Into Your Corporation Tax Return: What to Expect
What happens if HMRC opens an enquiry into your CT600. Your rights, the process, time limits, and how to respond.
Blog
Plain-English guides to UK Corporation Tax and CT600 filing.
Corporation Tax Rates 2025/26: Small Company Guide (19% vs 25%)
Complete guide to Corporation Tax rates for 2025/26. How the 19% small profits rate and 25% main rate work, marginal relief explained with examples.
How to Pay Corporation Tax: Every Payment Method Explained
All the ways to pay your Corporation Tax to HMRC — bank transfer, direct debit, online, and by post. Processing times and payment references explained.
CT600 Box by Box Guide 2025/26: Every Box Explained
Comprehensive CT600 box-by-box guide for 2025/26. What goes in each box, common mistakes, and worked examples for every section of the Corporation Tax return.
UK Company Tax Return: The Complete Beginner's Guide (2025)
Everything a new limited company director needs to know about filing a company tax return (CT600) with HMRC. From registration to submission, step by step.
Small Company Corporation Tax Rate 2025/26: Everything You Need to Know
The small profits rate, marginal relief band, and how to check which rate applies to your company. Updated for the 2025/26 tax year.
Corporation Tax Payment: Deadlines, Methods & What Happens If You're Late
When to pay Corporation Tax, how to pay HMRC, payment reference numbers, and the consequences of late payment. Complete guide for limited companies.
CT600 Tax Calculation Section (Boxes 430-525): How Your Tax Is Computed
Understanding the CT600 tax calculation boxes — Corporation Tax rates, marginal relief, tax payable, and payments on account. Every box explained.
CT600 Box by Box: The Income Section (Boxes 145-205) Explained
Detailed guide to every box in the CT600 income section. What goes where — turnover, trading profits, property income, chargeable gains, and total profits.
Employer National Insurance & Corporation Tax: What You Can Deduct
How employer NI contributions affect your Corporation Tax bill. What's deductible, Employment Allowance, and reporting on your CT600.
Confirmation Statement (Annual Return): What It Is & How to File
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.
Dormant Company Accounts & CT600: Filing Guide for Companies That Aren't Trading
How to file dormant company accounts with Companies House and a nil CT600 with HMRC. Step-by-step guide with deadlines and requirements.