How to apply for a SIN in Canada

What a SIN is and who needs one

Your Social Insurance Number is a personal number used by the Government of Canada. You need a SIN to work for an employer, to be paid, and to file your taxes. You also need one to receive benefits and services such as Employment Insurance, the Canada Pension Plan, and certain credits.

Almost everyone who lives and works in Canada needs a SIN, including Canadian citizens, permanent residents, and temporary residents with a valid permit that allows them to work. Parents often apply for a SIN for a newborn as well, so the child can be listed for certain benefits.

This is a general guide, not legal or government advice. Rules and details can change, so confirm the current process on Canada.ca before you apply.

There is no application fee

Applying for a SIN is free. Service Canada does not charge for a first number or for a confirmation of an existing one. If a website asks you to pay for a SIN, treat it as a warning sign and go to the official Government of Canada pages instead.

The three ways to apply

You can apply for a SIN in three ways. Pick whichever suits your situation.

• Online. You submit your application and upload clear photos or scans of your documents through the official Government of Canada service. This is often the fastest option when your documents are ready.
• By mail. You send a completed application form along with your original documents to the address listed on Canada.ca. Sending originals by mail takes longer, so plan ahead if you choose this route.
• In person. You visit a Service Canada centre with your documents. Staff can review your application on the spot, which is helpful if you have questions or an unusual situation.

Documents you need

To apply you generally need a primary identity document that proves your status in Canada, plus proof of your name if the primary document does not show it. The primary document depends on your status:

• Canadian citizens usually provide a birth certificate or a Canadian citizenship document.
• Permanent residents usually provide their permanent resident card or the confirmation of permanent residence.
• Temporary residents usually provide a valid work permit, study permit, or other document that allows them to be in Canada.

A passport is often used as supporting identification, especially for newcomers. Make sure the documents are valid, not expired, and match the name you are applying under. If your name has changed, bring a supporting document such as a marriage certificate or a legal name change record.

How newcomers apply

If you are new to Canada, you can usually apply for a SIN as soon as you arrive and have a document that authorizes you to work or study. Many newcomers apply in person at a Service Canada centre so staff can check the documents right away, but the online option works well too when your permit and passport are clear and easy to scan.

A SIN on its own does not change your immigration status. It simply lets employers pay you correctly and lets the government track your contributions and benefits. Once you have your number, you can move on to other setup tasks, such as arranging CRA direct deposit so refunds and benefits land in your bank account, and giving your employer a completed TD1 tax credits form so the right amount of tax is deducted from your pay.

After you apply

When your application is approved you will receive your SIN. Service Canada no longer issues plastic SIN cards, so you get a confirmation letter or a number to record instead. Write it down somewhere private and do not carry the number around with you.

If any government or employer form asks for your SIN, you can type it into the file cleanly using an online tool. You can fill a PDF in your browser and download it without printing. For other Canadian forms and guides, the Canada forms hub is a good starting point.

Protecting your SIN

Your SIN is a key to your identity, so guard it carefully.

• Only share it when it is truly required, such as with your employer, your bank for tax reporting, or a government program.
• Do not use it as a general piece of ID, and do not give it out over the phone or by email unless you started the contact and trust the recipient.
• Store any letter that shows your SIN in a safe place, not in your wallet.
• If you think your SIN has been lost, stolen, or misused, report it to Service Canada right away and watch your accounts for unusual activity.

With your number in hand and stored safely, you are set up to work, get paid, and receive the benefits you qualify for.

Common mistakes to avoid

A few small errors slow down SIN applications more than anything else. Knowing them ahead of time saves you a second trip or a returned envelope.

• Expired documents. A work or study permit that has expired cannot be used to prove your status. Check the dates before you apply and renew first if needed.
• Name mismatches. If the name on your primary document does not match the name you use day to day, include a supporting document that explains the change, such as a marriage certificate.
• Unclear copies. When you apply online, blurry or cropped photos of your documents are a common reason for delays. Use good light and capture the whole page.
• Sending photocopies by mail. The mail route usually requires original documents, not copies. Read the instructions on Canada.ca so you send the right thing.

Applying for a child

Parents and legal guardians can apply for a SIN on behalf of a child. This is often done so the child can be included in benefit and savings programs, or so a teenager can start a first job. The process is similar to an adult application, but you provide the child's identity document, such as a birth certificate, along with proof of your own identity and your relationship to the child. If you registered the birth in your province or territory, you may have been offered a SIN application at the same time, which is the simplest route.

Keeping your record up to date

Your SIN itself does not change over your lifetime, but the status attached to it can. If you move from a temporary permit to permanent residence or citizenship, you do not get a new number, but you should let Service Canada know so your record reflects your current status. Keeping this current helps make sure your employer and the tax system treat your income correctly and that your benefits are calculated properly. When these updates call for a form, you can complete it online with the same fill a PDF tool rather than printing anything.