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Plain-English guides to UK Corporation Tax and CT600 filing.

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22 February 2026

HMRC Free CT600 Filing Service Has Closed: What Directors Must Do Now

HMRC's free CT600 filing service closed permanently on 31 March 2026. Here's your complete action plan — deadlines, penalties, and the most affordable alternative at £59.

CT600 HMRC corporation tax filing deadline HMRC closure