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

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21 February 2026

How Are Dividends Taxed for Corporation Tax? A Complete Guide

How dividends interact with Corporation Tax — paying dividends, receiving dividends, the dividend exemption, franked investment income, and CT600 reporting for UK companies.

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21 February 2026

Do I Need an Accountant for Corporation Tax? When DIY Makes Sense

Find out whether you need an accountant for corporation tax or can file your CT600 yourself. Honest guide for UK limited company directors.

corporation-taxaccountantct600diylimited-companymicro-entity
21 February 2026

Small Company Corporation Tax Rates 2025/2026: Complete Guide

Understand corporation tax rates for small companies in 2025/2026, including the 19% and 25% thresholds, marginal relief calculation, and associated companies rules.

corporation tax ratessmall company2025/2026marginal reliefCT600
21 February 2026

First Year Corporation Tax: A Complete Guide for New Companies

New limited company? Learn when to register for corporation tax, your first accounting period, filing deadlines, and how to avoid common first-year mistakes.

first year corporation taxnew companyCT600company registrationHMRC
21 February 2026

How to Use HMRC Government Gateway to File Your CT600

Step-by-step guide to setting up and using your HMRC Government Gateway account to file your CT600 Corporation Tax Return online.

ct600hmrcgovernment-gatewaycorporation-taxfiling
21 February 2026

Corporation Tax for Investment Companies

How does corporation tax work for investment companies? Guide to holding investments through a limited company — dividends, capital gains, property, and filing your CT600.

corporation taxinvestment companyholding companydividendscapital gainsct600property investment
21 February 2026

Limited Company Expenses You Can Claim

Complete guide to allowable limited company expenses for Corporation Tax. Covers office costs, travel, staff, professional fees, and what HMRC disallows.

corporation-taxexpenseslimited-companyallowable-expensesct600
21 February 2026

R&D Tax Credits for SMEs: Complete Guide to Claiming

How UK small and medium-sized companies can claim R&D tax credits. Covers eligibility, qualifying costs, calculation examples, the merged scheme, and how to include R&D relief on your CT600.

R&D tax creditsresearch and developmentSMEcorporation taxCT600tax reliefHMRCinnovation
21 February 2026

Buy-to-Let Through a Company: Tax Guide

Should you hold buy-to-let property in a limited company? Complete guide to corporation tax on rental income, mortgage interest relief, and when a company structure makes sense.

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21 February 2026

Employer NIC: Corporation Tax Deduction Guide

Is employer NIC an allowable deduction for corporation tax? Yes. Learn how employer National Insurance works, current rates, the Employment Allowance, and how to claim on your CT600.

employer nicnational insurancecorporation taxallowable expensesemployment allowancect600payroll
21 February 2026

Corporation Tax on Rental Income: CT600 Guide

How is rental income taxed in a limited company? Learn how property income works on your CT600, allowable deductions, and when a property company makes sense.

corporation taxrental incomeproperty incomect600buy to letproperty companylimited company landlord
21 February 2026

CT600 Filing Agent Authorisation with HMRC

How to authorise an agent to file your CT600. Step-by-step guide to HMRC agent authorisation for corporation tax — online, by post, and what to do if things go wrong.

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