VAT Registration and Corporation Tax: How They Interact
Learn how VAT registration affects your Corporation Tax return, including input tax recovery, flat rate scheme profits, and what goes on your CT600.
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Plain-English guides to UK Corporation Tax and CT600 filing.
What Happens If Your Accounting Period Is Longer Than 12 Months?
HMRC splits accounting periods over 12 months into two, requiring two CT600 returns. Learn how to calculate tax for each period.
Corporation Tax Quarterly Instalment Payments: Who Needs to Pay and When
Find out if your company must pay Corporation Tax in quarterly instalments (QIPs), including thresholds, payment dates, and calculation.
R&D Tax Relief for SMEs: How the Merged Scheme Works and How to Claim on Your CT600
Understand the merged R&D tax relief scheme for SMEs from April 2024, qualifying expenditure, credit rates and reliefs, and which CT600 boxes to complete.
HMRC Rejected Your CT600? Common Errors and How to Fix Them
CT600 rejected by HMRC? Here are the most common rejection reasons — BVR errors, XML failures, mismatched data — and step-by-step instructions to fix and resubmit.
iXBRL Tagging for Company Accounts and CT600: What You Need to Know
How iXBRL tagging works for CT600 filing — what gets tagged, HMRC requirements, common tagging errors, and how to generate iXBRL accounts without specialist software.
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.
Capital Allowances and Corporation Tax: How to Claim Tax Relief on Business Assets
How to claim capital allowances on your CT600 — AIA, writing down allowances, full expensing, first-year allowances, and which assets qualify for Corporation Tax relief.
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.
Do I Need an Accountant for Corporation Tax? When DIY Makes Sense
Find out whether you need an accountant for corporation tax or can file your CT600 yourself. Honest guide for UK limited company directors.
The Cheapest Way to File Your CT600 in the UK (2026)
Compare every option for filing your CT600 — from accountants to DIY software — ranked by cost. Find the cheapest way to file your company tax return.
Taxfiler vs Taxpipe: How They Compared (Taxfiler Now Discontinued)
Taxfiler was discontinued in March 2025. See how the two CT600 tools compared on price, features, and ease of use — and why Taxpipe is the natural replacement for directors filing their own returns.