Calculkating NI contributions

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Enigmaman
Enigmaman Posts: 271 Forumite
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I have obtained the following calculation on gov.uk in respect of Tax and NI deductions on presumed income of $400.40 per week.

https://www.tax.service.gov.uk/guidance/self-employed-ready-reckoner/outcome/calculation-result

One assumes it is correct as it is gov.uk, but I was wondering what was going on with NICs?

The result does not differentiate between Class 2 and Class 4...so I have two questions:

(1) is this calculation correct?

(2) Are pension contributions taken into account when calculating NICs?    

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