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

109 results for “how to”Clear search
21 February 2026

HMRC Corporation Tax Online Account: How to Set Up and Use It

Step-by-step guide to setting up your HMRC Corporation Tax online account. Register, activate, and manage your company tax — including how to file your CT600.

HMRCcorporation taxonline accountGovernment Gateway
21 February 2026

Corporation Tax Penalties & Interest Charges

Understand HMRC corporation tax penalties for late filing and payment, how interest is calculated, and how to appeal. Complete guide for UK company directors.

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21 February 2026

Director's Loan Account: Tax Implications

Complete guide to director's loan account tax implications. Covers overdrawn DLAs, S455 tax, bed and breakfasting rules, and how to stay compliant with HMRC.

directors loan accountDLAs455corporation taxoverdrawnbed and breakfastinglimited company
20 February 2026

CT600 Box by Box Guide: Every Section Explained in Plain English

A complete walkthrough of every CT600 box and section. Understand what each field means, which boxes apply to your company, and how to fill them in correctly.

CT600HMRCcorporation taxtax returnguide
20 February 2026

How to Reduce Corporation Tax Legally: 12 Strategies for UK Companies

Discover 12 legal ways to reduce your corporation tax bill. From capital allowances to pension contributions, learn how to minimise what your company pays HMRC.

corporation taxtax planninglimited companyallowable expenses
20 February 2026

Associated Companies — How They Affect Your Corporation Tax Rate

How associated companies change your Corporation Tax thresholds. What counts, what doesn't, dormant company exemption, and how to report them on your CT600.

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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.

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20 February 2026

Corporation Tax Payment Reference — How to Pay HMRC Correctly

How to construct your Corporation Tax payment reference, HMRC bank details, payment methods, and what to do if you use the wrong reference.

payment referencecorporation taxHMRCUTRpaymentdeadline
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

Dividends vs Salary: The Tax-Efficient Way to Pay Yourself

How to optimise your salary and dividends mix as a limited company director. Save thousands in tax with the right strategy — and how it affects your CT600.

corporation taxdividendssalarytax planninglimited companyCT600NIPAYE
19 February 2026

What Happens If You Don't File Corporation Tax? Penalties, Interest, and How to Fix It

Missed your CT600 deadline? Learn about HMRC penalties (£100 to 10% surcharges), interest charges, how to appeal, and the fastest way to get back on track.

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19 February 2026

R&D Tax Relief for Small Companies: What to Claim on Your CT600

R&D tax credits for SMEs: what qualifies, how to calculate the relief, and which CT600 boxes to complete. Plain English guide.

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