UK tax estimates · Tax years 2025/26–2023/24 · Estimates only (not advice) · Tools include take‑home pay (PAYE), student loans, self‑employment (Class 2/4 NI), dividends and pensions.

Assumptions & sources
Tax Calculator 365

Tax Calculator 365

Self-employed tax calculator (UK)

Estimate Income Tax plus Class 2 and Class 4 National Insurance on self-employed profits. Select a tax year and nation (Scotland vs rest of UK).

Try the calculatorHow it works
Estimates only • No sign-up required • Tax years 2025/26–2023/24

Inputs

Estimate self-employed Income Tax and National Insurance for a sole trader (Class 2 and Class 4). This is an estimate only.

Last updated: 2025-04-06

Profit after allowable business expenses, before tax.

Profit is required.

Optional. If you also have employment income, enter it here to allocate Income Tax bands.

Optional. We estimate dividend tax separately and apply your Personal Allowance to non-dividend income first.

Optional. For this estimate, we assume pension contributions reduce annual income used in the calculation.

Results

Enter your profit to see an estimate.

Notes

This tool provides an estimate. Self Assessment calculations can differ based on your full circumstances (for example, multiple income types, reliefs, and deductions).

From the 2024/25 tax year onwards, Class 2 National Insurance is generally treated as paid when profits are at or above the Small Profits Threshold. You may choose to pay Class 2 voluntarily if profits are below the threshold.