VAT Registration and Corporation Tax: How They Interact
Learn how VAT registration affects your Corporation Tax return, including input tax recovery, flat rate scheme profits, and what goes on your CT600.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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What Happens If Your Accounting Period Is Longer Than 12 Months?
HMRC splits accounting periods over 12 months into two, requiring two CT600 returns. Learn how to calculate tax for each period.
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.
R&D Tax Relief for SMEs: How the Merged Scheme Works and How to Claim on Your CT600
Understand the merged R&D tax relief scheme for SMEs from April 2024, qualifying expenditure, credit rates and reliefs, and which CT600 boxes to complete.
HMRC Rejected Your CT600? Common Errors and How to Fix Them
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.
iXBRL Tagging for Company Accounts and CT600: What You Need to Know
How iXBRL tagging works for CT600 filing — what gets tagged, HMRC requirements, common tagging errors, and how to generate iXBRL accounts without specialist software.
First Year Corporation Tax: A Complete Guide for New Companies
New limited company? Learn when to register for corporation tax, your first accounting period, filing deadlines, and how to avoid common first-year mistakes.
Corporation Tax Refund: How to Get Money Back If You Overpaid HMRC
Overpaid corporation tax? Learn how to claim a refund from HMRC, amend your CT600, and understand timelines for getting your money back.
How to Use HMRC Government Gateway to File Your CT600
Step-by-step guide to setting up and using your HMRC Government Gateway account to file your CT600 Corporation Tax Return online.
CT600 Filing Agent Authorisation with HMRC
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.
R&D Tax Credits for SMEs: Complete Guide to Claiming
How UK small and medium-sized companies can claim R&D tax credits. Covers eligibility, qualifying costs, calculation examples, the merged scheme, and how to include R&D relief on your CT600.
HMRC Corporation Tax Refund: How Long?
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.