Corporation Tax Quarterly Instalment Payments: Who Needs to Pay and When
Find out if your company must pay Corporation Tax in quarterly instalments (QIPs), including thresholds, payment dates, and calculation.
Plain-English guides to UK Corporation Tax and CT600 filing.
Find out if your company must pay Corporation Tax in quarterly instalments (QIPs), including thresholds, payment dates, and calculation.
Understand the merged R&D tax relief scheme for SMEs from April 2024, qualifying expenditure, enhanced rates, and which CT600 boxes to complete.
CT600 rejected by HMRC? Here are the most common rejection reasons — BVR errors, XML failures, mismatched data — and step-by-step instructions to fix and resubmit.
How iXBRL tagging works for CT600 filing — what gets tagged, HMRC requirements, common tagging errors, and how to generate iXBRL accounts without specialist software.
New limited company? Learn when to register for corporation tax, your first accounting period, filing deadlines, and how to avoid common first-year mistakes.
Overpaid corporation tax? Learn how to claim a refund from HMRC, amend your CT600, and understand timelines for getting your money back.
Step-by-step guide to setting up and using your HMRC Government Gateway account to file your CT600 Corporation Tax Return online.
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.
Complete guide to allowable limited company expenses for Corporation Tax. Covers office costs, travel, staff, professional fees, and what HMRC disallows.
How long does an HMRC corporation tax refund take? Typical timescales, what causes delays, how to chase a late repayment, and tips to get your refund faster.
Compare filing your CT600 through HMRC online vs commercial software. Learn the pros, cons, costs, and which option saves you time and money in 2026.
What are the penalties for filing your CT600 late? Understand HMRC penalty rates, interest charges, and how to avoid or appeal late filing penalties.