Corporation Tax for Contractors: IR35 and Your CT600
How IR35 affects your Corporation Tax return. Inside vs outside IR35, deemed payments, and guidance for contractor companies.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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R&D Tax Relief for Small Companies: What to Claim on Your CT600
R&D tax credits for SMEs: what qualifies, how to calculate the relief, and which CT600 boxes to complete. Plain English guide.
Corporation Tax Losses: How to Carry Forward and Carry Back Losses
How to use trading losses on your CT600 return. Carry forward, carry back, group relief, and which CT600 boxes to complete for loss relief claims.
How to Amend a CT600 — Correcting Mistakes on Your Corporation Tax Return
Filed your CT600 and spotted an error? Here's how to amend your Corporation Tax return, the time limits, and what happens if HMRC finds the mistake first.
Capital Allowances for Small Companies — AIA, Full Expensing & Cars
How to claim capital allowances on your CT600. AIA, full expensing, car rules, and writing down allowances for small companies.
Your First Company Tax Return — A New Director's Guide to CT600 Filing
Just set up a limited company? Everything you need to know about your first CT600 — when it is due, what to include, and how to file.
Dormant Company CT600 Filing: Do You Still Need to File? (Yes — Here's How)
Your dormant company still needs to file a CT600 with HMRC. Learn what counts as dormant, how to file, and the fastest way to stay compliant for just £59.
10 Common CT600 Mistakes (and How to Avoid Them)
The most frequent errors company directors make when filing their CT600. From wrong dates to missing boxes — and how to get it right first time.
Accounting Periods Explained — When Does Your Corporation Tax Year Start and End?
What is an accounting period for Corporation Tax? How to work out your dates, what happens in your first year, and how periods affect your CT600 deadlines.
How to File a CT600 Online — Step by Step Guide
Learn how to file your CT600 corporation tax return online step by step. Plain English guide covering deadlines, common mistakes and what you need to start.
CT600 Penalties: What Happens If You File Late?
Complete guide to CT600 late filing penalties and charges. How much you'll pay, when penalties apply, and how to appeal HMRC penalty decisions.
CT600 Deadline: When Is Your Company Tax Return Due?
When is your CT600 due? Your company tax return deadline is 12 months after the accounting period ends. Late filing means automatic penalties.