Self-Employed Tax Calculator

Turn turnover and expenses into a taxable profit. Then see Income Tax, Class 4 National Insurance and student loan repayments — plus what lands on your Self Assessment bill in January and July, and how much to set aside each month.

This calculator estimates an individual's UK tax on self-employment profits. It is not a limited-company or full tax-return calculator.

Your self-employment

Income Tax rates are devolved to Scotland. National Insurance and the Trading Allowance are the same across the UK.

How do you want to enter your profit?

All self-employment income before business expenses.

£

Business costs you expect to claim against this income.

£

Income taxed separately from your self-employment profit — for example PAYE salary or a taxable pension.

£
Enter pension contribution as

The cash you pay. Basic-rate relief is added by the provider using this tax year's relief-at-source rate.

£
Postgraduate Loan
First Self Assessment year

Choose Yes if this is the first tax year for which you expect a Self Assessment liability and you have not already made payments on account.

About this calculation

Calculator scope, assumptions and official sources.

Self-employment tax guide

Turnover versus profit

Turnover is everything the business invoiced or received. Profit is what is left after allowable business costs, and it is profit — not turnover — that is taxed. The money sitting in your business account is not a guide either: it still contains the tax you owe, and it may be missing costs you have incurred but not yet paid. Work from your figures for the year, not from the balance today.

Important limitations

This estimate is for sole-trader self-employment profits. It does not model partnership allocations, CIS deductions, VAT or limited-company extraction. For the wider topic set, start at the Self-Employed hub.

Frequently asked questions

What does this Self-Employed Tax Calculator estimate?

It estimates Income Tax, Class 4 National Insurance, Class 2 treatment where relevant, optional student loan repayments and Self Assessment payments on account for a UK sole trader.

Is tax charged on turnover or profit?

Tax is charged on taxable profit, not turnover. Profit is what remains after allowable business expenses or the Trading Allowance, depending on the option you choose.

Do I still pay Class 2 National Insurance?

The compulsory weekly Class 2 charge has been abolished from 2024/25. Where profits are at or above the Small Profits Threshold, Class 2 is treated as paid for State Pension purposes at no cost. Below that threshold you can pay voluntarily.

What are payments on account?

Payments on account are advance payments towards the next tax year. Where they apply, HMRC usually asks for two instalments — 31 January and 31 July — based on Income Tax and Class 4 left to collect through Self Assessment.

What does this calculator not include?

It is not a limited-company calculator, does not convert cash basis to traditional accounting, and does not compute detailed capital allowances. Enter final figures from your chosen accounting basis.

Official sources

Figures are estimates and may differ from your Self Assessment calculation. See the methodology page for how Sorvuna builds estimates. This is not tax, legal or financial advice.

Employed as well as self-employed? Open the Income Tax Calculator. Negotiating a salaried role on a take-home target? Open the Net to Gross Salary Calculator. Thinking about a limited company? Open the Director Salary and Dividend Calculator.

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