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

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21 February 2026

Corporation Tax Refund: How to Claim Back Overpaid Tax from HMRC

How to claim a corporation tax refund from HMRC. Covers overpayment, amended returns, loss carry-back, and how long refunds take.

corporation taxHMRCrefundoverpaymentCT600
21 February 2026

Corporation Tax Interest: Late Payment Rates, Repayment Interest & How to Avoid Charges

HMRC charges interest on late corporation tax at base rate + 2.5%. Learn current rates, how interest is calculated, and how to avoid it.

corporation taxinterestlate paymenthmrcrepayment interestct600penalties
21 February 2026

Every Corporation Tax Relief Available to UK Companies (2025/26 Complete List)

Every corporation tax relief for UK companies in 2025/26 — R&D, creative industry, patent box, capital allowances, and more.

corporation taxtax reliefallowancesr&dpatent boxcreative industriesct600hmrc
21 February 2026

Non-UK Company Trading in the UK? When You Need to Pay Corporation Tax

Non-UK company with UK activities? When you must register for corporation tax, file a CT600, and what counts as a permanent establishment.

ct600non-uk companypermanent establishmentcorporation taxhmrcoverseas companyinternational tax
21 February 2026

Company Cars & Corporation Tax: Capital Allowances, BIK, and CT600 Treatment

How company cars affect corporation tax. Capital allowances for cars, benefit in kind rules, and CT600 treatment.

corporation taxcompany carbenefit in kindcapital allowancesct600electric vehiclelease
21 February 2026

Sole Trader vs Limited Company: Full Tax Comparison (2025/26)

Should you incorporate? Tax comparison between sole trader and limited company at every profit level — income tax, NI, dividends.

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21 February 2026

CT600 vs Self Assessment: What's the Difference? (Company vs Personal Tax)

CT600 vs Self Assessment: the key differences between company tax returns and personal tax returns. Who files which and why.

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21 February 2026

Can't Pay Your Corporation Tax? How to Set Up an HMRC Payment Plan

Can't afford your corporation tax bill? Learn how to set up an HMRC Time to Pay arrangement and avoid penalties.

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21 February 2026

CT600 for Contractors: Filing When You're Inside or Outside IR35

How IR35 status affects your CT600. Practical guide for contractors filing corporation tax — inside IR35, outside IR35, or mixed.

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21 February 2026

Just Incorporated? Your First CT600 Timeline: Key Dates You Can't Miss

New limited company timeline: when to register for corporation tax, your first accounting period, CT600 deadline, and payment date.

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21 February 2026

Corporation Tax Group Relief: How to Share Losses Between Companies

How to use corporation tax group relief to share losses between companies. 75% ownership test, consortium relief, and filing.

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21 February 2026

Working from Home Tax Relief for Limited Companies: What You Can Claim

How to claim work-from-home expenses through your limited company. Flat rate method, actual costs, and allowable expenses.

corporation taxworking from homeallowable expenseslimited companytax relief
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