Corporation tax

Corporation Tax in 2026: the 19% and 25% rates, deadlines, penalties and the Marginal Relief trap

In the UK, companies work out their own profit tax — HMRC will never send you a bill. The rate depends on profits: 19% up to £50,000, 25% above £250,000, and a sliding Marginal Relief scale in between. The tax is due before the return, and a late return now costs £200 from day one. Here are the rules, in order.