I call it a stamp, but mostly when paid at the minimum level to count as a year's worth of contributions, such as a director taking about £7,500 of salary. For the most part I call the amounts NI contributions, NI, or NICs.
This will no doubt please my mum ("king_pellinor uses the word "stamp", and he's a CTA...") and denies me the opportunity to tease her for being old-fashioned.
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