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.
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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.
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.
CT600 for Amazon/eBay Sellers: E-commerce Corporation Tax Guide 2026
Complete guide to filing CT600 for Amazon, eBay, and e-commerce sellers operating through a limited company. Covers stock valuation, platform fees, VAT interaction, international sales, FBA considerations, and step-by-step filing instructions.
CT600 for Property Companies: Landlord Corporation Tax Guide 2026
Complete guide to filing CT600 for property investment companies. Covers rental income reporting, mortgage interest deductions, capital allowances on furnishings, property disposal gains, and step-by-step filing instructions for buy-to-let landlords.
CT600 for Contractors and Freelancers: Complete Tax Filing Guide 2026
Complete guide to filing your CT600 as a contractor or freelancer operating through a PSC. Covers IR35 implications, dividend vs salary tax efficiency, expense claims, and step-by-step filing instructions.
TaxCalc vs Taxpipe: Which CT600 Software Is Better in 2026?
Honest head-to-head comparison of TaxCalc vs Taxpipe for CT600 filing. Features, pricing, ease of use — which is right for your company?
What Happens If You Miss the CT600 Deadline? Penalties, Interest & How to Fix It
Missed your CT600 deadline? Learn the exact HMRC penalty structure — £200 initial then 10% and a further 10% for filing dates from April 2026 — how late payment interest works at 7.75%, and the steps to fix it fast. Plus how to appeal.
How Much Does CT600 Filing Cost? Accountant vs Software vs DIY (2026 Prices)
Compare CT600 filing costs in 2026: Taxpipe at £59 vs accountants at £200-500+ vs HMRC's free service (closed 31 March 2026). Real prices, real scenarios, real savings.
HMRC Free CT600 Filing Service Has Closed: What Directors Must Do Now
HMRC's free CT600 filing service closed permanently on 31 March 2026. Here's your complete action plan — deadlines, penalties, and the most affordable alternative at £59.
Best CT600 Software for Limited Companies (2026 Comparison)
Comparing the best CT600 corporation tax software for UK limited companies in 2026. Pricing, features, and which one is right for your business.