Self Employed Tax Calculator
Estimate self employed tax from profit, expenses, other PAYE income, National Insurance, and payments on account.
Taxable profit
£47,000.00
Income tax on profit
£6,886.00
Class 2 NI
£179.40
Class 4 NI
£3,098.70
Total tax bill
£10,164.10
Net profit after tax
£36,835.90
Monthly take-home equivalent
£3,069.66
Payment on account
£5,082.05
Payments on account are normally two instalments of half the previous tax year bill, due 31 January and 31 July.
What this tool includes
- Income
- Allowable expenses
- PAYE income
- Class 2 NI
- Class 4 NI
- Payments on account
What this tool calculates
This calculator estimates self employed tax from income, allowable expenses and any other PAYE income. It shows taxable profit, income tax, Class 2 NI, Class 4 NI, total bill and payment-on-account estimates.
How to use it
- Enter self employed income and allowable expenses.
- Add PAYE income if relevant.
- Review the tax bill, net profit and monthly equivalent.
Worked example
If self employed income is GBP55,000 and allowable expenses are GBP8,000, taxable profit is GBP47,000 before income tax and National Insurance are estimated.
Key assumptions
- Uses 2026/27 tax and NI figures from the brief.
- Payments on account are simplified as half the bill.
- Does not replace Self Assessment or accountant advice.
Last updated: July 2026
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