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Live tool
Self-Assessment Tax Estimator
Estimates tax owed on self-employed or side-hustle income.
Income Tax on total income
Class 4 National Insurance (on profit)
Estimated amount to set aside
A simplified estimate using standard tax bands and Class 4 NI (6% then 2%). It doesn't account for allowable expenses, the trading allowance, or Class 2 NI voluntary contributions — an accountant or HMRC's own tools will give a more precise figure.