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A Plain-English Guide to Filing Your CT600

TaxCorn Team10 April 20267 min read

Every active limited company must file a CT600 Company Tax Return, usually within 12 months of your accounting period end, with Corporation Tax paid within 9 months and 1 day.

You'll need your statutory accounts, a tax computation, and any claims for reliefs (like R&D or capital allowances). TaxCorn lets you upload your accounts and walks you through the rest.

Missing the deadline triggers an automatic £100 penalty, rising the longer it's left outstanding, so it pays to file early.

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