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.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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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.
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.
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.
How Are Dividends Taxed for Corporation Tax? A Complete Guide
How dividends interact with Corporation Tax — paying dividends, receiving dividends, the dividend exemption, franked investment income, and CT600 reporting for UK companies.
Corporation Tax Deadlines 2026: When You Need to File and Pay
All corporation tax deadlines for 2026 — CT600 filing dates, payment due dates, and penalties for late filing. Key dates for UK limited companies.
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.
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.
CT600 Nil Return: How to File When Your Company Has No Trading Activity
Learn how and when to file a CT600 nil return for a dormant or non-trading company, including deadlines, penalties, and step-by-step guidance.
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 Tax Year-End Planning: 12 Tips
Reduce your corporation tax bill before year end. 12 practical planning tips for UK limited companies — from pension contributions to capital allowances and loss relief.
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.