← Free tools · 2026/27 rates
Corporation tax calculator
Corporation tax at 19% to 25%, with marginal relief and your key dates.
More free tools
Self-employed tax & NI
Income tax and Class 4 National Insurance on your profits, plus payments on account.
Salary vs dividends
The most tax-efficient mix of salary and dividends for a limited company director.
Sole trader vs limited company
Would you take home more by going limited? Both options side by side.