A Social Insurance Number (SIN) is a unique nine-digit number issued by the Government of Canada to all eligible individuals residing in the country, including citizens, permanent residents, and temporary workers.
It serves as an essential identifier for various purposes such as employment, taxation, and accessing government benefits and services. It helps track an individual’s contributions to the Canada Pension Plan (CPP) and Employment Insurance (EI) programs, which provide income support during retirement, unemployment, and other eligible life events.