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Calculio

Business calculators

Calculators for UK small business owners, sole traders and limited company directors, covering corporation tax, dividend versus salary planning, break-even and profit margin.

Business

Corporation Tax Calculator

Work out your Corporation Tax bill, including marginal relief, for any level of company profit.

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Business

Dividend vs Salary Calculator

Compare take-home pay from taking company profit as salary versus dividends, after Corporation Tax, Income Tax and National Insurance.

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Business

Break-Even Calculator

Work out how many units you need to sell, and at what revenue, to cover your fixed and variable costs.

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Business

Profit Margin Calculator

Work out your profit margin, markup percentage and profit from a cost price and selling price.

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Business

Late Payment Interest Calculator

Work out statutory interest and compensation you can claim on an overdue business invoice under UK late payment law.

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Business

Freelance Day Rate Calculator

Work out the day rate you need to charge to hit your income target, after expenses, non-billable time and downtime.

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Business guides

Calculio guide to UK Corporation Tax rates and marginal relief for 2026/27Business

Corporation Tax for Small UK Companies: Rates, Marginal Relief and a Worked Example

The 19% small profits rate, the 25% main rate, how marginal relief tapers the two together, and a worked example for a company on £100,000 profit.

21 August 20266 min read
UK limited company director reviewing salary and dividend paperwork for 2026/27Business

Salary vs Dividends: How UK Limited Company Directors Should Pay Themselves in 2026/27

How Income Tax, National Insurance and Corporation Tax interact when you pay yourself salary versus dividends, with a worked £10,000 example and the small-salary strategy most directors use.

20 August 20265 min read