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.
Blog
Plain-English guides to UK Corporation Tax and CT600 filing.
Corporation Tax for Startups: The Complete Guide for New Limited Companies
Corporation tax for startups. Registration, deadlines, expenses, R&D relief, first CT600 filing, and mistakes to avoid.
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 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.
Company Struck Off or Dissolved? You May Still Need to File a CT600
Company struck off or dissolved? You may still owe corporation tax. When a final CT600 is required and how to restore a company.
Corporation Tax on Cryptocurrency: How to Report Bitcoin & Crypto on Your CT600
How UK companies pay corporation tax on crypto. Buying, selling, mining, staking, DeFi, and NFTs — what goes on your CT600.
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.
Making Tax Digital for Corporation Tax: What Your Company Needs to Know
HMRC cancelled Making Tax Digital for Corporation Tax in July 2025. Here's what happened, what it means for your company, and what filing changes do affect you now.
Corporation Tax Interest: Late Payment Rates, Repayment Interest & How to Avoid Charges
HMRC charges interest on late corporation tax at base rate + 4% — currently 7.75%. Learn current rates, how interest is calculated, and how to avoid it.
HMRC Enquiry Into Your CT600: What to Expect and How to Respond
Received an HMRC enquiry about your CT600? What triggers enquiries, your rights, what HMRC can ask, and how to respond.
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.
Marginal Relief for Corporation Tax: How It Works (With Calculation Examples)
How marginal relief works for Corporation Tax in 2025/26. Step-by-step calculation for profits between £50,000 and £250,000.