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.
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Plain-English guides to UK Corporation Tax and CT600 filing.
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What Records Do I Need for My Company Tax Return?
Complete checklist of records and documents needed for CT600 filing. How long to keep them, what HMRC expects, and how to organize everything.
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.
HMRC Free Filing Ended March 2026 — What You Need to Know
HMRC shut down its free CT600 filing service on 31 March 2026. Here's what changed, why it matters, and what your options are going forward.