File CT600 After HMRC Free Service Closes (2026)
HMRC's free CT600 service closed on 31 March 2026. Step-by-step guide to filing your corporation tax return from April 2026 using commercial software.
Blog
Plain-English guides to UK Corporation Tax and CT600 filing.
112 results for “hmrc”Clear search
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.
HMRC Free CT600 Deadline March 2026: Action Plan
HMRC's free CT600 filing service closed on 31 March 2026. Here's exactly what to do if you haven't switched yet — step-by-step, no panic required.
Filing Your First CT600: A Step-by-Step Guide for New Companies
Just incorporated a UK limited company? Here's everything you need to know about filing your first CT600 Corporation Tax return — from registering with HMRC to submitting your return.
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.
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.
FreeAgent CT600 Filing: Can You File Corporation Tax Through FreeAgent?
FreeAgent can file CT600 returns for most micro-entities directly with HMRC. Learn what FreeAgent covers, where it falls short, and when Taxpipe is a better fit for your CT600 filing.
Research & Development (R&D) Tax Credits on CT600: SME Guide 2026
Complete guide to claiming R&D tax credits on your CT600. Covers the merged R&D scheme, qualifying expenditure, CT600L supplementary page, HMRC compliance checks, and cash credits vs tax reduction.