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

182 results for “CT600”Clear search
23 February 2026

TinyTax Alternative: Compare CT600 Filing Software for 2026

Looking for a TinyTax alternative? Compare features, pricing, and HMRC compliance. Taxpipe offers CT600 filing at £59 with full iXBRL support.

comparisonct600softwaretinytax
23 February 2026

Annual Investment Allowance (AIA): Claim £1M Tax Relief on Your CT600

How to claim Annual Investment Allowance on your CT600. £1 million limit, qualifying assets, how to calculate, and common mistakes.

ct600capital-allowancesaiatax-relief
23 February 2026

CT600 Filing Deadline Calculator: When Is Your Return Due?

Calculate your CT600 filing deadline and Corporation Tax payment deadline. Different deadlines explained with examples for various accounting periods.

ct600deadlinehmrccorporation-tax
23 February 2026

What Is a UTR Number? How to Find Yours for CT600 Filing

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.

utrhmrcct600getting-started
23 February 2026

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.

ct600hmrcenquirycorporation-taxcompliance
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

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

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
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