[identity profile] king-pellinor.livejournal.com 2012-11-27 05:03 pm (UTC)(link)
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.

[identity profile] philmophlegm.livejournal.com 2012-11-27 06:59 pm (UTC)(link)
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.