Plain-English guides to UK Corporation Tax and CT600 filing.
HMRC is withdrawing its free CT600 filing service on 31 March 2026. Learn what this means for your company, your options for filing after the deadline, and how to switch to affordable software before it closes.
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 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.
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.
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 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 does not file CT600 returns directly to HMRC. Learn what FreeAgent does for corporation tax, its limitations, and how to pair it with Taxpipe for affordable CT600 filing.
Complete guide to corporation tax loss relief. Learn how to carry forward trading losses, carry back to previous years, claim group relief, and fill in CT600A correctly.
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.
Complete guide to claiming capital allowances on your CT600. Covers Annual Investment Allowance (AIA), writing down allowances, first-year allowances, full expensing, and which CT600 boxes to fill in.
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.
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.