Corporation Tax Losses: How to Carry Forward and Offset Against Future Profits
How to carry forward trading losses on your CT600 to reduce future corporation tax bills. Box references, time limits, and practical examples.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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Dormant Company Corporation Tax: Do You Need to File a CT600?
Find out if your dormant company must file a CT600 with HMRC. When you're exempt, when you must file, and how to submit a nil return.
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.
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.
Capital Allowances and Corporation Tax: How to Claim Tax Relief on Business Assets
How to claim capital allowances on your CT600 — AIA, writing down allowances, full expensing, first-year allowances, and which assets qualify for Corporation Tax relief.
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 Nil Return: How to File When Your Company Has No Trading Activity
Learn how and when to file a CT600 nil return for a dormant or non-trading company, including deadlines, penalties, and step-by-step guidance.
Corporation Tax on Bank Interest: How It Works
How is bank interest taxed for UK limited companies? Learn the CT600 treatment, reporting requirements, and how to reduce your corporation tax on savings interest.