Calculate UK National Insurance contributions (Class 2 and Class 4) for self-employed workers based on net profits.
Last updated: February 23, 2026
Enter your net taxable profits from self-employment.
Self-employed workers in the UK pay National Insurance contributions (NICs) on their profits. There are two classes that apply: Class 2 and Class 4.
Class 2 contributions help you qualify for the State Pension and certain benefits. Class 4 is a profit-based charge collected through your Self Assessment tax return.
Calculate UK National Insurance contributions (Class 2 and Class 4) for self-employed workers based on net profits. This tool runs in-browser for fast results without account setup.
Yes. UK Self-Employment Tax Calculator is free to use on ConvertCrunch.
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