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.
Federal Public Service Social Security
The FPS Social Security and Public Institutions of Social Security (, , ), more commonly known as the FPS Social Security, is a Federal Public Service of Belgium. It was created by Royal Order on May 23, 2001, as part of the plans of the Verhofstadt I Government to modernise the federal administration.