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You need to pay Class 4 National Insurance contributions if you’re self-employed and earning over £9,501 a year (in 2020/21).
Most people pay it through your Self Assessment tax return bill.
In the 2022/23 tax year, your Class 4 National Insurance contributions are:
This is on top of your Class 2 National Insurance contributions (about £3.15 a week).
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As a self-employed you have to pay your National Insurance contributions yourself during your annual Self Assessment, together with any income tax you might owe.
You pay no NI contributions on the first £9,500 that you make.
You will need to pay Class 2 NI worth £159.
You will also have to pay £3,555 (9%) on your income between £9,500 and £49,000.
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