National Insurance number
The National Insurance number is used as a reference number in the Pay As You Earn system, and also by the self-employed. It is also used in applications for Individual Savings Accounts (ISAs), to check that an individual has opened only one ISA in a tax year.
Social Security Tribunal of Canada
Social Security Tribunal of Canada (formerly Canada Pension Plan / Old Age Security Review Tribunals) is a Canadian independent body that is mandated to hear quasi-judicial issues regarding the Canada Pension Plan (CPP), Old Age Security (OAS), and the Employment Insurance Act (EI).