How to get a Social Insurance Number in Canada

What is a Social Insurance Number and why do you need one?

The Social Insurance Number is the number that connects you to Canada's payroll, tax and benefits systems. Service Canada, part of Employment and Social Development Canada (ESDC), describes it plainly: to work in Canada or access government programs and benefits, you need a 9-digit identifier known as a SIN (source: canada.ca, read September 2026). Without one, an employer cannot put you on payroll properly, and the Canada Revenue Agency has no way to match your earnings to you.

For newcomers it is usually the second or third errand after landing, alongside a bank account and, in Alberta, registering for your Alberta health care card. Service Canada lists four things a SIN is required for: working legally in Canada, getting paid and paying taxes, accessing programs such as Employment Insurance (EI) and the Canada Pension Plan (CPP), and filing your income tax return.

Who needs a SIN, and who can apply?

Anyone who works in Canada needs one, whether they are a citizen, a permanent resident or a temporary resident with work authorisation. Service Canada says anyone aged 12 or over can apply for their own SIN. For children below the age of majority in their province or territory, a parent or legal guardian applies on their behalf, and a legal guardian or representative can apply for adults in their care.

You must apply, and provide all required documents even if you already hold a SIN, when you need a first-time SIN, want to confirm a SIN for yourself or your child, need to correct or update your SIN record, or need to extend the expiry date of a temporary SIN starting with 9. Newborns in the provinces are usually registered through the provincial Newborn Registration Service rather than directly with Service Canada.

The trigger is work, not status alone. A visitor with no work authorisation has nothing to apply with. A student who will never take a job does not need one either, though most eventually do: see our guide to work while studying in Canada for when a study permit carries the condition that allows it. A spouse or partner arriving on an open work permit applies exactly as the principal applicant does, using their own permit as the primary document.

What documents do you need for a Social Insurance Number application?

The document rule is simple in structure: one primary document that proves your status in Canada, and one secondary document that confirms your identity. If your name has changed since the primary document was issued, you also need a supporting document showing the link between the old name and the new one, for every change.

Two details catch people out. The secondary document must be valid, not merely genuine, so an expired passport will be refused even though it is unmistakably yours. And a permanent resident card works as a primary document at any point in its life, while a Confirmation of Permanent Residence only works within a year of landing, which is why new permanent residents are told to get the SIN errand done early.

How to apply for a Social Insurance Number, step by step

Online is the fastest of the three channels and the one Service Canada recommends. Whichever you choose, gather the documents first: an incomplete application cannot be corrected part way through, you have to start a new one with every document attached again.

1. 01

   Check you have the right permit

   Temporary residents need a work permit, study permit or visitor record that authorises work. Permanent residents use a PR card, COPR or Record of Landing.

2. 02

   Gather one primary and one secondary document

   Plus supporting documents for any name change. Translations are needed for anything not in English or French.

3. 03

   Choose your channel

   Online for about 5 business days, by mail to the Social Insurance Registration Office in Bathurst, New Brunswick, for about 20, or in person at a Service Canada office.

4. 04

   Submit everything at once

   If a document is missing you cannot return to the application. You must submit a fresh one with the full set included.

5. 05

   Watch for the confirmation emails

   If you provide an email address you get one when Service Canada receives the application and another when it has been processed.

6. 06

   Retrieve your Social Insurance Number

   View and print it in My Service Canada Account, or receive a SIN confirmation letter by post if you prefer or are not eligible for an account.

7. 07

   Give it to your employer

   You can start work as soon as you have applied; pass the number on as soon as it arrives.

How does a SIN work for temporary residents?

This is where most newcomers trip up. A SIN issued to a temporary resident always starts with 9 and expires on the same date as the permit that authorised the work, whether that is a work permit, a study permit or a visitor record. It is not a one-off errand: the record has to keep pace with your immigration status.

Service Canada says you must apply or update your SIN record when you are legally authorised to work and will be working, when you need confirmation of your SIN, when you receive a new permit with a new expiry date, when your immigration status changes (for example from temporary resident to permanent resident), when your legal name changes, or when you are correcting an error.

The maintained status rule is worth underlining, because it is the one that saves jobs. If you applied to extend your permit before it expired, you are on maintained status, and Service Canada confirms you may continue working with the expired SIN until IRCC makes a decision. Employers who do not know this sometimes take people off payroll unnecessarily. A short note from you, pointing to the Service Canada page and your extension receipt, usually settles it.

Your SIN, payroll and your first tax return

Once you hand the number over, it does most of its work quietly. Your employer uses your Social Insurance Number to run payroll, to withhold income tax, EI premiums and CPP contributions, and to issue the T4 slip that reports your earnings for the year. If a job ends, the Record of Employment (ROE) that supports an Employment Insurance claim is filed against the same number.

It follows you into the Canada Revenue Agency side of life as well. Your T1 income tax return, any GST/HST credit, the Canada Child Benefit and registered accounts such as an RRSP or a TFSA are all tied to the SIN. That is also why a bank asks for it when you open an interest-bearing account: the institution has a legal obligation to report that income. Where there is no such obligation, you are entitled to say no, and Service Canada makes the point that you should not treat the number as general-purpose ID.

What if you lose your SIN, or someone else uses it?

You do not need to reapply simply because you cannot remember the number. Service Canada suggests checking an income tax return, a T4 or other tax slip, a Record of Employment, or an RRSP contribution receipt. You can also sign in to My Service Canada Account to view and print it at any time.

If your old plastic card is lost or damaged, request a Confirmation of SIN instead: plastic cards are no longer issued but existing ones remain usable, and the confirmation arrives as a letter in paper or digital form. Keep the number somewhere secure rather than in a wallet. Service Canada is explicit that you are responsible for protecting your Social Insurance Number and that it is illegal for anyone else to use it, and it runs a separate process for fraud, misuse or identity theft, including exposure in a data breach. Share the number only where it is legally required, which in practice means your employer, your bank for interest reporting, and government programs.

Warning signs are worth knowing: a T4 slip for a job you never held, a CRA notice about income you did not earn, or an EI claim you did not make. If any of those appear, contact the SIN Program and the CRA, and ask about the steps Service Canada takes in confirmed misuse cases. A new SIN is issued only in narrow circumstances, and having one does not erase the old record.

Where does the SIN fit in your first weeks in Canada?

The SIN is one item on a short list of practical tasks that follow landing. Our guide to the first steps after landing in Canada sets out the order most newcomers find works: confirm your status documents, apply for your SIN, open a bank account, register for provincial health coverage, then sort a driving licence and school registrations. If you are still in the packing stage, our moving to Canada checklist covers what to bring so those first errands go smoothly. In Alberta the health registration is AHCIP, and our guide to healthcare for newcomers in Canada explains the waiting periods that apply elsewhere.

Working under a licensed RCIC (CICC #R706497), we advise on the work permit routes that get you to Canada in the first place, and on how to become a permanent resident of Canada once you are here. We do not issue SINs and cannot apply for one on your behalf: that is a free Service Canada process you complete yourself. What we can do is make sure the permit underneath it is right, because a Social Insurance Number is only ever as good as the status it is attached to, and an expired or mismatched permit is what turns a five-minute errand into a payroll problem. We never guarantee an outcome on any application.