• Source: Social insurance number

A social insurance number (SIN) (French: numéro d'assurance sociale (NAS)) is a number issued in Canada to administer various government programs. The SIN was created in 1964 to serve as a client account number in the administration of the Canada Pension Plan and Canada's varied employment insurance programs. In 1967, Revenue Canada (now the Canada Revenue Agency) started using the SIN for tax reporting purposes. SINs are issued by Employment and Social Development Canada (previously Human Resources Development Canada).
The SIN is formatted as three groups of three digits (e.g., 123-456-789).
The top of the card has changed over the years as the departments that are responsible for the card have changed:

Manpower and Immigration
Employment and Immigration Canada
Human Resources Development Canada
Government of Canada
The 2012 Canadian federal budget contained provisions to phase out the Social Insurance Number cards because they lacked modern security features and could be used for identity theft. As of 31 March 2014, Service Canada no longer issues plastic SIN cards. Instead, an individual will receive a paper "Confirmation of SIN" letter.




Functionality


Through functionality creep, the SIN has become a national identification number, in much the same way that the Social Security number has in the United States. However, unlike in the US, in Canada there are specific legislated purposes for which a SIN can be requested. It is not an identity document.
Unless an organization can demonstrate that the reason it is requesting an individual's SIN is specifically permitted by law, or that no alternative identifiers would suffice to complete the transaction, it cannot deny or refuse a product or service on the grounds of a refusal to provide a SIN. Examples of organizations that legitimately require a SIN include employers, financial institutions that provide interest on deposits, and federal government agencies. Giving a SIN when applying for consumer credit, such as buying a car or electronics, or allowing it to be used as a general purpose identification number, such as by a cable company, is strongly discouraged.
The Canadian military used the SIN as a form of unique identifier from the 1960s until the 1980s, when service numbers were reintroduced. Military identification, including ID cards and identity discs were marked with the SIN during this period.




Temporary SINs


Social Insurance Numbers that begin with the number "9" are issued to temporary residents who are not Canadian citizens or Canadian permanent residents (e.g., foreign students, individuals on work visas). Often, these individuals must have an employment authorization in order to work in Canada. SINs beginning with a "9" are different from SINs assigned to citizens and permanent residents, because they have an expiry date (which usually coincides with the expiration of the holder's work permit). These SINs are invalid unless there is an expiry date listed on the card and the date has not passed.




Permanent resident SINs


Issued by the federal government to each Canadian citizen or permanent resident;
The SIN is unique and assigned to only one citizen




Validation


Social Insurance Numbers can be validated through a simple check digit process called the Luhn algorithm.

046 454 286 <--- A fictitious, but valid, SIN.
121 212 121 <--- Multiply every second digit by 2.

The result of the multiplication is:

0 8 6 8 5 8 2 16 6

Then, add all of the digits together (note that 16 is summed as the individual digits 1+6):

0 + 8 + 6 + 8 + 5 + 8 + 2 + 1+6 + 6 = 50

If the SIN is valid, this number will be evenly divisible by 10.




Geography


The first digit of a SIN usually identifies the province in which it was registered, as listed below. However, the government has found it necessary in the past to supply certain regions with SINs assigned to other regions.

1: Nova Scotia, New Brunswick, Prince Edward Island, and Newfoundland and Labrador; new Ontario SINs are now being issued with the 1 series
2–3: Quebec
4–5: Ontario (excluding Northwestern Ontario), and overseas forces
6: Northwestern Ontario, Manitoba, Saskatchewan, Alberta, Northwest Territories, and Nunavut
7: British Columbia, Yukon, and new business numbers.
8: Used exclusively for the BN (Business Number) assigned to business owners and corporations. Due to the limited number of BNs available, new BNs can start with a 7.
9: Temporary resident
0: CRA-assigned individual tax numbers, temporary tax numbers or adoption tax numbers




See also


National Insurance number (NINO) – British equivalent
Death Master File, a database of deaths maintained by the Social Security Administration in the US
Canada service numbers, military identification numbers for the Canadian Armed Forces introduced in the 1990s.




References






External links


Social Insurance Number – Overview at the Government of Canada
The Social Insurance Number (SIN) Code of Practice at the Government of Canada
Directive on Social Insurance Number at the Government of Canada
Social Insurance Number Regulations at Department of Justice
Best Practices for the use of Social Insurance Numbers in the private sector at the office of the Privacy Commissioner of Canada
Protecting your SIN at the Government of Canada
Protecting your Social Insurance Number at the office of the Privacy Commissioner of Canada
Fact Sheet: Social Insurance Numbers (SIN) (archived) at the office of the Privacy Commissioner of Canada

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