CT600 Filing Agent Authorisation with HMRC
How to authorise an agent to file your CT600. Step-by-step guide to HMRC agent authorisation for corporation tax — online, by post, and what to do if things go wrong.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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Limited Company Expenses You Can Claim
Complete guide to allowable limited company expenses for Corporation Tax. Covers office costs, travel, staff, professional fees, and what HMRC disallows.
HMRC Penalties for Late Corporation Tax Filing
What are the penalties for filing your CT600 late? Understand HMRC penalty rates, interest charges, and how to avoid or appeal late filing penalties.
Company Tax Return (CT600) vs Annual Accounts: What's the Difference?
CT600 vs annual accounts: one goes to HMRC, one to Companies House. What each is, when they are due, and how they relate.
How to Appeal a CT600 Late Filing Penalty from HMRC
Got a CT600 late filing penalty? You may be able to appeal. Step-by-step guide to HMRC penalty appeals, reasonable excuses, and time limits.
How to File Your CT600 Yourself in 2026 (Complete DIY Guide)
File your CT600 without an accountant in 2026. What you need, how to prepare accounts, calculate tax, and submit to HMRC.
Free CT600 Filing Software: What Are Your Options in 2026?
Free CT600 filing software compared. HMRC's free filing service closed in March 2026 — here's what it offered and what to use instead.
HMRC Free CT600 Filing Ends March 2026: Your 5 Best Alternatives
HMRC free CT600 filing ends 31 March 2026. Compare the best alternatives by price, features, and ease of use.
Can't Pay Your Corporation Tax? How to Set Up an HMRC Payment Plan
Can't afford your corporation tax bill? Learn how to set up an HMRC Time to Pay arrangement and avoid penalties.
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.
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.
Do I Need to File a CT600? When Your Company Must Submit a Tax Return
Find out whether your limited company needs to file a CT600 Corporation Tax return with HMRC. Covers dormant companies, new companies, losses, and exemptions.