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

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23 February 2026

Creative Industry Tax Relief: Film, TV, Video Games & More on Your CT600

Guide to claiming creative industry tax reliefs on your CT600 — film, TV, video games, animation, theatre, orchestra, and museums.

ct600creative-industrytax-reliefcorporation-tax
23 February 2026

Patent Box: Pay Just 10% Corporation Tax on Patent Profits

How the Patent Box regime lets UK companies pay only 10% Corporation Tax on profits from patented inventions. Eligibility, calculation, and CT600 reporting.

ct600patent-boxcorporation-taxtax-relief
23 February 2026

Trading Losses & Corporation Tax: How to Claim Relief on Your CT600

Complete guide to claiming trading loss relief on your CT600 — carry back, carry forward, group relief, and terminal loss relief explained with examples.

ct600lossescorporation-taxtax-relief
23 February 2026

Company Capital Gains & Corporation Tax: Complete CT600 Guide

How limited companies report capital gains on the CT600, including indexation allowance, the substantial shareholding exemption, and which boxes to complete.

ct600capital-gainscorporation-taxtax-guide
23 February 2026

CT600 Marginal Relief Calculator 2024-25 Examples

Marginal relief reduces your corporation tax if profits are between £50k and £250k. Step-by-step calculation with real examples for 2024-25 CT600 returns.

marginal reliefCT600corporation taxtax calculation2024-25worked examples
23 February 2026

File CT600 After HMRC Free Service Closes (2026)

HMRC's free CT600 service closes March 2026. Step-by-step guide to filing your corporation tax return from April 2026 using commercial software.

CT600corporation taxHMRCfiling guideApril 2026step by step
23 February 2026

Filing Your First CT600: A Step-by-Step Guide for New Companies

Just incorporated a UK limited company? Here's everything you need to know about filing your first CT600 Corporation Tax return — from registering with HMRC to submitting your return.

CT600new companyfirst returncorporation taxHMRCguidelimited company
23 February 2026

CT600 Late Filing Penalties: How Much They Cost and How to Avoid Them

Miss your CT600 deadline and HMRC charges escalating penalties from £100 to 10% of unpaid tax. Learn the exact penalty structure, appeal options, and how to file on time.

CT600penaltieslate filingHMRCcorporation taxdeadlinescompliance
23 February 2026

HMRC Business Tax Account: How to Access and Manage Your Corporation Tax Online

Complete guide to HMRC Business Tax Account for limited companies. Learn how to register, access your corporation tax records, check deadlines, view payments, and manage your CT600 obligations online.

HMRCBusiness Tax Accountcorporation taxGovernment GatewayCT600online serviceslimited company
23 February 2026

Sage CT600 Filing: Can You File Corporation Tax Through Sage?

Sage Accounting does not file CT600 returns to HMRC. Learn what Sage does for corporation tax, its limitations, and how to pair it with Taxpipe for affordable CT600 filing.

CT600Sagecorporation taxaccounting softwaretax filinglimited companySage 50
23 February 2026

Filing a CT600 for a Short Accounting Period: Complete Guide

Need to file a CT600 for a period shorter than 12 months? Learn when short periods happen, how tax is calculated, financial year splits, and how to avoid HMRC rejection errors.

CT600short accounting periodcorporation taxfinancial year splitHMRCnew companyyear-end change
23 February 2026

QuickBooks CT600 Filing: Can You File Corporation Tax Through QuickBooks?

QuickBooks does not file CT600 returns to HMRC. Learn what QuickBooks does for corporation tax, its limitations, and how to pair it with Taxpipe for affordable CT600 filing.

CT600QuickBookscorporation taxaccounting softwaretax filinglimited company
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