Dormant Company CT600: The 15-Minute Nil Return Guide (2026)
Got a dormant company? You still need to file a CT600. This 2026 guide shows you how to file a nil return in 15 minutes — even without HMRC's free service.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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CT600 Late Filing Penalties: How Much They Cost and How to Avoid Them
Miss your CT600 deadline and HMRC charges escalating penalties — from £200 on day one for filing dates from April 2026, rising to 10% of unpaid tax. Learn the full penalty structure, appeal options, and how to file on time.
HMRC Free CT600 Filing Has Closed: What Are Your Options?
HMRC withdrew its free CT600 filing service on 31 March 2026. Learn what this means for your company, your options for filing going forward, and how to switch to affordable software.
HMRC Business Tax Account: How to Access and Manage Your Corporation Tax Online
Complete guide to HMRC Business Tax Account for limited companies. Learn how to register, access your corporation tax records, check deadlines, view payments, and manage your CT600 obligations online.
Sage CT600 Filing: Can You File Corporation Tax Through Sage?
Sage Accounting does not file CT600 returns to HMRC. Learn what Sage does for corporation tax, its limitations, and how to pair it with Taxpipe for affordable CT600 filing.
Filing a CT600 for a Short Accounting Period: Complete Guide
Need to file a CT600 for a period shorter than 12 months? Learn when short periods happen, how tax is calculated, financial year splits, and how to avoid HMRC rejection errors.
Micro-Entity Accounts: What They Are and How to File with Your CT600
Complete guide to micro-entity accounts for UK limited companies. Learn the qualifying thresholds, what to include, FRS 105 requirements, and how they work with your CT600 filing.
QuickBooks CT600 Filing: Can You File Corporation Tax Through QuickBooks?
QuickBooks does not file CT600 returns to HMRC. Learn what QuickBooks does for corporation tax, its limitations, and how to pair it with Taxpipe for affordable CT600 filing.
Corporation Tax Loss Relief: How to Claim on Your CT600
Complete guide to corporation tax loss relief. Learn how to carry forward trading losses, carry back to previous years, claim group relief, and which CT600 boxes to use for each type of relief.
How to Correct a CT600 Mistake: Amending Your Corporation Tax Return
Made an error on your CT600? Learn exactly how to amend your corporation tax return, HMRC time limits, penalties for mistakes, and how to fix common CT600 errors step by step.
Filing CT600 Without an Accountant: Is It Safe? A Step-by-Step Guide
Can you safely file your CT600 without an accountant? Yes for simple companies. When DIY filing is safe, when to get help, and how to do it step by step.
Xero CT600 Filing: Can You File Corporation Tax Through Xero?
Xero does not file CT600 returns. Learn what Xero does for corporation tax and how to pair it with Taxpipe for affordable CT600 filing.