UK Corporation Tax Calculator

The UK Corporation Tax Calculator is a free, no‑sign‑up online tool that helps UK limited companies compute their corporation tax liability for the 2026/27 tax year, including marginal relief for profits between £50,000 and £250,000.

• Instant calculation of tax payable, effective rate and profit after tax.
• Supports entry of accounting period length and associated companies to adjust thresholds.
• Scenario planner lets users compare up to three profit levels for salary vs dividend planning.
• Clear display of payment and filing deadlines based on year‑end date.
• Educational explanations of how corporation tax works, marginal relief formula, and associated‑company rules.

Targeted at entrepreneurs, finance directors, and accountants, the calculator delivers quick, accurate insights to support tax‑efficient decision‑making without any cost or registration.