Social Insurance Number Canada: All You Need to Know 

The Social Insurance Number in Canada, also known as SIN, is a unique nine-digit number for your taxes, government benefits, processing income, employment insurance premiums, and retirement pension plans, issued by Service Canada. 

The Canadian SIN serves as a personal identifier available for Canadian citizens, permanent residents, or temporary residents with a valid permit. You need a SIN to work in Canada, submit taxes, access government programs, and earn interest on your bank account. 

You can apply for a SIN online or in person at a Service Canada Center. This guide covers everything you need to know about getting your Canadian SIN number, what it is, the required documents, and the step-by-step application process. 

Social Insurance Canada – Key Takeaways

A SIN is a nine-digit number required to work, file taxes, and access government benefits in Canada, permanent for citizens and permanent residents, temporary (starting with “9”) for temporary residents. 

You can apply in person (fastest), online, or by mail. Mail applications are reserved for those far from a Service Canada office or applying from outside Canada. 

Required documents depend on your status (citizen, permanent resident, or temporary resident). Always bring originals; never photocopies. 

SIN@Entry is a new update that lets newcomers get a SIN through IRCC before arrival, but it isn’t live yet. Applicants must use the existing routes for now. 

Treat your SIN like a password: Share it only with employers, the CRA, and financial institutions. 

There are two main types of Social Insurance Numbers in Canada: permanent SIN and temporary SIN. The permanent SIN is for Canadian citizens and permanent residents and is valid for life. The temporary SIN is for temporary residents and has an expiry date based on your immigration document, such as a work permit or a valid study permit with work authorization. 

Both are nine-digit numbers issued by Service Canada. The main difference is that temporary SINs always start with the digit “9”, while permanent SINs do not. Temporary residents must renew their SIN every time it expires.  

If they change their immigration status and gain permanent residency in Canada, they can apply for a permanent SIN. Examples of immigration programs that can lead to permanent resident status include the Start-up Visa, Express Entry, and Provincial Nominee Programs (PNPs). If you don’t plan on living in Canada full time but need to handle financial and legal matters, you will need a SIN to work there, file taxes, and access benefits like the Canada Pension Plan and Employment Insurance. 

A Canadian SIN is used for various activities in Canada, such as: 

• Processing income: You will need a SIN to report your employment income and passive income. Your employer can ask for it to process the payroll and report your earnings to the Canada Revenue Agency (CRA). 
• Employment insurance premiums: You must have a SIN to access Employment Insurance (EI) benefits, so your employer can deduct EI premiums based on your income. 
• Tax purposes: The CRA uses your SIN to process your tax records, income, deductions, and credits. 
• Access government programs and benefits: The SIN provides full access to Canada Pension Plan (CPP), Old Age Security (OAS), some provincial social assistance programs, and other government or federal programs. 
• Earning interest on your bank account:  The interest earned on bank accounts in Canada, like a savings account, is taxable income. Banks will need your SIN to report the interest income so that you can earn interest. 

Your nine-digit number can be found in three places:

• CRA-related documents: The SIN will be listed on the first page of most documents you submit to the Canada Revenue Agency (CRA), like T4 employment slips, tax slips for RRSP (Registered Retirement Savings Plan) contributions, and income tax returns.
• Confirmation of SIN letter: You will receive a SIN confirmation letter from Service Canada in a paper format. The SIN number is at the top of the document.
• Your personal MSCA account: You can find your SIN by signing up and registering for My Service Canada Account (MSCA). The number will be available after you’ve received the SIN confirmation letter.

Note: Canada no longer issues plastic SIN Cards, but if you already have one and it is still valid, you can keep using it.

To be eligible for a Social Insurance Number (SIN), you must be a Canadian citizen, permanent resident, or temporary resident with an authorized permit.

Canadian citizen 

As a citizen of Canada, you receive a permanent SIN that doesn’t expire. Canadian parents usually register their children at birth through their provincial Newborn Registration Service. 

Permanent resident 

After you gain permanent residency, you are eligible for a permanent SIN. The IRCC (Immigration, Refugees and Citizenship Canada) will issue a Permanent Resident Card (PR Card), which you can use to apply for a SIN. 

Temporary resident with authorized permit 

Temporary residents are eligible for a temporary SIN after receiving a valid permit. Those eligible are temporary foreign workers on a valid work permit, international students authorized for on or off-campus employment, and some refugee claimants. 

You can get a new SIN by applying through Service Canada in three ways: in person, online, or by mail.

In person 

Find a local Service Canada center. The application requires submitting original and valid identity documents, not photocopies. You will receive your new SIN in paper format, not on plastic cards, on the same day you file it. Some SIN services are also available at Toronto Pearson, Montréal-Trudeau, and Vancouver International airports during specific hours.  

Online 

Go to the official Service Canada website and follow the directions. Upload digital copies of original documents. Online applications are typically processed within a few business days. , Check canada.ca for the current timeline before applying 

If you choose to receive your SIN online, you can see it on your My Service Canada Account (MSCA) after your application has been processed. In this case, you won’t get a physical copy of your SIN confirmation letter by mail. 

By mail 

Submit original identity documents by mail and send them to the Social Insurance Registration office. By-mail applications take the longest to process, so confirm the current timeline on canada.ca before applying, as this can change.  

Note that Mail applications are intended for applicants who live more than 100 km from a Service Canada office, face extenuating circumstances, or are applying from outside Canada.  

The Canadian government is developing SIN@Entry, a program that will let newcomers request their SIN directly through their IRCC secure account before they arrive in Canada as part of their immigration application.  

Once live, applicants for streams like work permits or permanent residence will be able to request a SIN and access their SIN Confirmation Letter online, without a separate application or an in-person visit to a Service Canada Centre. 

SIN@Entry is different from SIN@Landing, which already exists and lets newcomers apply for a SIN in person at Service Canada centers located in select Canadian airports upon arrival.  SIN@Entry includes SIN issuance into the immigration process itself, before newcomers arrive Canada.  

A launch date has been announced, but has shifted since the program was first introduced. Until SIN@Entry is live, newcomers should continue using the existing SIN application routes (in person, online via eSIN, by mail, or at SIN@Landing airport locations). 

Your SIN is kind of like a “master key” and you should protect it. Sharing it with the wrong person could result in identity theft, privacy invasion, loss of bank credits, tax refunds, and government benefits.

It’s best to take general precautions to protect your SIN. Here are a couple of examples where you can give out your SIN and when you shouldn’t.

As a first-time applicant, the documents you need depend on your status in Canada. In every case, you need one primary document proving your identity and legal status, and one secondary document confirming your identity. 

For all applicants 

Supporting documents (if applicable): if your current legal name doesn’t match your primary or secondary document, for example, after marriage, divorce, or a legal name change, you’ll need a marriage certificate/statement, divorce decree, legal name change certificate, or adoption order to show the link. 

If applying by mail, you’ll also need to complete Form NAS2120. 

Canadian citizen 

• Primary document: a Canadian certificate of birth or birth certificate, a certificate of Canadian citizenship, or Registration of Birth Abroad (before 1977). 
• Secondary document: a passport, driver’s license, or provincial/territorial ID card. 

Permanent resident 

• Primary document: a Permanent Resident Card, a Confirmation of Permanent Residence (COPR) accepted within 1 year of becoming a permanent resident, after which the PR Card is required, or a Record of Landing (issued before June 28, 2002). 
• Secondary document: a passport, driver’s license, or provincial/territorial ID card. Note: if using a COPR, it must be accompanied by either a travel document (e.g., a foreign passport) or provincial/territorial photo ID. 

Temporary resident (student or worker) 

• Primary document: a valid work permit, or a study permit that states you “may work” or “may accept employment” (if your study permit doesn’t say this, you’ll need IRCC to amend it before applying), or a visitor record from IRCC authorizing you to work. 
• Secondary document: a passport or government-issued driver’s license. 

Note: Always bring your original documents – no photocopies. If any of your documents are not in English or French, you will need a certified translation. All non-English/French documents must be translated.  

The application process for a Canadian Social Insurance Number (SIN) comes in different stages. These include:

Step 1. Collect all the paperwork. When it is time to apply, you must provide original documents for identification, proof of legal status, and supporting documents. 

Step 2. Complete and sign the application form. The GC-NAS2120 Form is mandatory for applicants applying via mail, but it is not necessary if you apply online or in person at a local Service Canada Centre. However, you must sign the application form if you want to authorize someone else to apply in person and on your behalf. 

Step 3. Mail the application form. Send all your paperwork to the Service Canada Center via a reliable postal service that allows you to track your packages. 

Step 4. Wait for officials to review your application. Officials process online applications in a few business days, and mail applications take longer. Applying in person has the fastest processing time, since you get a SIN the same day. It is important to check canada.ca for the current timeline before applying.  

Step 5. Obtain your SIN. You will receive the nine-digit number online or on paper mailed to your address. 

To renew or replace your SIN in Canada, you must apply to Service Canada and update your record with a valid immigration document, such as an extended work permit or study permit. You can apply by mail, at a local office, or online.

If you applied to renew your work permit or study permit, but haven’t received a decision yet, you can continue working in Canada. However, you shouldn’t leave the country until you get a valid immigrant status.

Countless Americans moving to Canada decide to make this country their new home due to its investment potential. Although Canada doesn’t have a specific citizenship by investment program, like Turkey or Grenada, it offers many opportunities for permanent residency through investment.