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

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22 February 2026

Company Director Tax Responsibilities: What You Must Do (and When)

Every UK company director has legal tax obligations. This checklist covers corporation tax, PAYE, VAT, confirmation statements, and key deadlines.

company directortax responsibilitiesHMRCPAYEVATcorporation tax
22 February 2026

HMRC Free CT600 Filing Is Ending March 2026: What Are Your Options?

HMRC's free Corporation Tax Online service closes 31 March 2026. Here's what happens next and the cheapest ways to file your CT600 after the deadline.

HMRCCT600free filing endingcorporation tax software2026
22 February 2026

UK Corporation Tax Rates 2025/26: Complete Guide with Examples

Corporation tax rates for 2025/26: 19% small profits rate, 25% main rate, and marginal relief in between. Includes worked examples and thresholds.

corporation tax rates2025/26marginal reliefsmall profits rateCT600
22 February 2026

What Is iXBRL? Inline XBRL Explained Simply for Company Directors

HMRC requires iXBRL for CT600 accounts and tax computations. What is it, why does it matter, and how do you create it? Plain English guide for directors.

iXBRLXBRLCT600HMRCaccounts filingcorporation tax
22 February 2026

How to Get a Corporation Tax Refund from HMRC (Overpayment Guide)

Overpaid corporation tax? Learn how to claim a refund from HMRC, how long it takes, and what to do if your refund is delayed.

corporation taxHMRC refundoverpaymenttax refundCT600
22 February 2026

Dividend vs Salary: The Most Tax-Efficient Split for 2025/26

How much salary and dividends should you take? We calculate the optimal split for UK limited company directors in 2025/26, including the impact on corporation tax.

dividendssalarycorporation taxtax planninglimited companyCT600
22 February 2026

12 Common CT600 Mistakes That Cost Directors Money (And How to Avoid Them)

Filing your own CT600? Avoid these 12 costly mistakes that catch first-time filers. From wrong accounting periods to missed reliefs — save time and tax.

CT600common mistakescorporation taxtax filing tipsdirectors
22 February 2026

First Year Corporation Tax: What New Limited Companies Need to Know

Just incorporated? Here's your complete guide to corporation tax in your first year — registration, deadlines, what to file, and how to pay.

corporation taxnew companyfirst CT600limited companyHMRC registration
22 February 2026

How to Pay Corporation Tax: Complete HMRC Payment Guide 2025/26

Step-by-step guide to paying your corporation tax bill. Covers all payment methods, deadlines, payment references, and what happens if you pay late.

corporation taxHMRC paymentpayment referenceCT600tax deadline
22 February 2026

How to Amend a CT600 Tax Return: Correcting Mistakes After Filing

Made an error on your CT600? Learn how to amend your corporation tax return within the 12-month deadline, what changes HMRC allows, and the step-by-step process.

CT600HMRCamendmentscorporation taxtax return corrections
22 February 2026

HMRC Free Filing Is Ending: What to Use Instead

HMRC's free CT600 filing service closes March 2026. Step-by-step guide to choosing a replacement and filing your Corporation Tax return.

hmrcct600free-filingreplacement2026
22 February 2026

Best Alternatives to HMRC's Free Filing Service in 2026

HMRC's free CT600 filing tool closes March 2026. Compare the best alternatives: Taxpipe (£59), accountants, and full accounting software for UK limited companies.

hmrcct600alternativessoftware2026
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