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

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

What Happens After You File Your CT600? HMRC Processing Timeline

Filed your CT600? Here's what happens next — HMRC processing times, status updates, potential enquiries, and when to expect confirmation.

CT600HMRCfilingprocessing timecorporation tax
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

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
22 February 2026

HMRC Free Filing Has Closed: What to Use Instead

HMRC's free CT600 filing service closed on 31 March 2026. Step-by-step guide to choosing a replacement and filing your Corporation Tax return.

hmrcct600free-filingreplacement2026
21 February 2026

CT600 Deadline: When to File Your Corporation Tax Return (and When to Pay)

When is your CT600 due? Filing deadlines, payment deadlines, and how they differ from Companies House deadlines. Avoid late penalties.

21 February 2026

CT600 Box-by-Box Guide: Every Core Box Explained (2025/26)

Complete walkthrough of every CT600 box from 1 to 620. Plain English explanations, what to enter, and which boxes most small companies actually use.

21 February 2026

Corporation Tax Losses: How to Carry Forward and Offset Against Future Profits

How to carry forward trading losses on your CT600 to reduce future corporation tax bills. Box references, time limits, and practical examples.

21 February 2026

Dormant Company Corporation Tax: Do You Need to File a CT600?

Find out if your dormant company must file a CT600 with HMRC. When you're exempt, when you must file, and how to submit a nil return.

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