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Limited company tax explained for 2026/27. Learn UK Corporation Tax rates, Marginal Relief, allowable expenses, dividends, deadlines and ways to reduce tax.

Reclaiming S455 tax after repaying a director’s loan? Learn when you can claim S455 back, the 9-month rule, CT600A, L2P and HMRC refund rules.

Find your 17-character Corporation Tax payment reference, where to locate it in your HMRC account and what to do if you use the wrong reference.

How to Reduce Corporation Tax: 12 Legal Ways (2026/27).

When is Corporation Tax due? Learn the 9 months and 1 day payment rule, CT600 filing deadlines, examples and key dates for UK limited companies.

Learn how to file company accounts with Companies House and HMRC, including deadlines, CT600 filing, Corporation Tax, costs and common mistakes.

R&D tax credits allow UK limited companies to reduce Corporation Tax or receive a cash repayment for developing new or improved products, software or processes where scientific or technological uncertainty existed. Claims must now follow strict HMRC compliance rules, including advance notification, a detailed technical narrative, an Additional Information Form and correct reporting on the CT600 tax return.