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

23 February 2026

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.

corporation-taxhmrcpaymentguide
23 February 2026

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.

ct600guidehmrccorporation-taxboxes
23 February 2026

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.

ct600beginnerscorporation-taxhow-tolimited-company
23 February 2026

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-taxsmall-businesstax-rates2025-26
23 February 2026

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.

corporation-taxpaymentdeadlineshmrchow-to
23 February 2026

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.

ct600boxestax-calculationcorporation-taxmarginal-relief
23 February 2026

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.

ct600boxesincomecorporation-taxhow-to
23 February 2026

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.

ct600national-insuranceemployercorporation-taxpaye
23 February 2026

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.

companies-houseconfirmation-statementannual-returncompliance
23 February 2026

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.

ct600dormantcompanies-housecorporation-tax
23 February 2026

Company Dissolution & Strike Off: Do You Still Need to File a CT600?

What happens to your Corporation Tax obligations when closing a limited company. Final CT600 filing, strike-off timing, and common mistakes to avoid.

ct600dissolutionstrike-offcorporation-tax
23 February 2026

HMRC Penalties for Corporation Tax: Late Filing, Late Payment & Errors

Complete guide to HMRC penalties for Corporation Tax — late filing (£100 to £1,500+), late payment interest, and inaccuracy penalties. How to avoid them.

ct600hmrcpenaltiescorporation-tax
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