Business & Self-Employed Calculators
Profit, expenses, corporation tax, dividends and day rates for sole traders and limited companies. Model your numbers before you file.
Self-Employed Tax Calculator
See what tax and National Insurance you pay as a sole trader, and your profit after tax.
Use calculatorDividend Tax Calculator
Work out the tax on your dividends — the £500 allowance and the 8.75%, 33.75% and 39.35% rates.
Use calculatorCorporation Tax Calculator
See how much corporation tax your limited company owes on its taxable profits.
Use calculatorProfit Margin Calculator
See your profit margin and markup, and the price needed for a target margin.
Use calculatorFreelancer Day Rate Calculator
Turn a freelancer day rate into annual income, tax and take-home pay.
Use calculatorBreak-Even Calculator
See how many units and how much revenue you need to cover your costs.
Use calculatorPayroll Cost Calculator
See the full cost of employing someone — salary, employer NI, pension, benefits and bonuses — and what the employee takes home.
Use calculatorPayroll Run Calculator
Add your team and see the combined payroll picture — gross pay, take-home pay, HMRC payments and total employment cost for the whole run.
Use calculatorMileage Expenses Calculator
Work out what you can claim for business mileage at the official HMRC rates — cars, vans, motorcycles and bicycles.
Use calculatorSalary vs Dividends Calculator
Compare all-salary, salary-plus-dividends and all-dividends extraction strategies for a limited company director.
Use calculatorHoliday Entitlement Calculator
Calculate your statutory annual leave entitlement in days and weeks, pro-rated for part-time work or a part-year start.
Use calculatorRead up on business & self-employed
New to the topic? Start with a plain-English guide, then put the numbers into the calculators above.
How to become self-employed
Registering with HMRC, tax returns and what you need to do first.
Read the guide BusinessSole trader vs limited company
The pros, cons and tax differences of each trading structure.
Read the guide TaxSelf-employed tax explained
Income tax and Class 4 NI on your profits, simply explained.
Read the guide BusinessMileage allowances explained
The HMRC mileage rates — 55p per mile for cars and vans in 2026/27, plus motorcycles, bicycles and passenger claims.
Read the guide