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

85 results for “Guide”Clear search
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

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

Corporation Tax for Small Businesses: 2026

Complete 2026 guide to corporation tax for small businesses. Covers rates, allowable expenses, filing deadlines, payment dates, and tips to reduce your tax bill legally.

corporation taxsmall business2026limited companyCT600small profits ratetax guide
21 February 2026

Corporation Tax on Overseas Income: Guide

How UK companies pay corporation tax on overseas income. Covers foreign trading profits, dividends, rental income, double taxation relief, and CT600 reporting.

corporation taxoverseas incomeforeign incomedouble taxation reliefCT600UK companyinternational tax
21 February 2026

Company Formation & Corporation Tax Registration

Step-by-step guide to registering for Corporation Tax after forming a limited company. Covers CT41G, UTR numbers, deadlines, and first CT600 filing.

corporation-taxcompany-formationregistrationct600hmrcnew-company
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

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.

buy-to-letcorporation taxproperty companyrental incomemortgage interestlimited companysection 24
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
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