You're talking about the UK? It's not 12.5%: http://www.hmrc.gov.uk/ni/intro/basics.htm#4 http://www.hmrc.gov.uk/ni/intro/basics.htm#4 "If you earn more than

You're talking about the UK? It's not 12.5%: http://www.hmrc.gov.uk/ni/intro/basics.htm#4 http://www.hmrc.gov.uk/ni/intro/basics.htm#4 "If you earn more than £149 a week and up to £797 a week, you pay 12 per cent of the amount you earn between £149 and £797. If you earn more than £797 a week, you also pay 2 per cent of all your earnings over £797"