Limited Company Tax
Limited company tax explained for 2026/27. Learn UK Corporation Tax rates, Marginal Relief, allowable expenses, dividends, deadlines and ways to reduce tax.
What is Tax Deductible
What is tax deductible? Learn which UK business expenses you can claim, what HMRC disallows and how allowable expenses can reduce your taxable profit.
Corporation Tax Payment Reference
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.
When is Corporation Tax Due?
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.
R&D Tax Credits
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.