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Class 4 National Insurance is one of the two types of National Insurance (NI) that you pay if you’re self-employed.
The other type is Class 2.
You start paying Class 4 NI once you earn over £9,501 a year (from all your combined income sources).
Class 4 NI is 9% for self-employment profits between £9,501 and £50,000, and 2% on anything above £50,000.
For more information, you can use this employed and self-employed calculator to see how much NI you should pay.