Las cifras se refieren a beneficios (profits) y no a ingresos, tal como se explica en Gov.uk:
You usually pay 2 types of National Insurance if you’re self-employed:
Class 2 if your profits are £5,965 or more a year
Class 4 if your profits are £8,060 or more a year
You work out your profits by deducting your expenses from your self-employed income.
How much you pay
Class Rate for tax year 2016 to 2017
Class 2 £2.80 a week
Class 4 9% on profits between £8,060 and £43,000, 2% on profits over £43,000
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