SIN Number Canada (2026): Documents, How to Apply, and the 9-Series Expiry Trap

How do you apply for a SIN online, by mail, or in person?

Short answer: Three routes. Online, you upload clear digital copies of both sides of each document, showing the whole document including its borders. In person at a Service Canada Centre, you bring originals and receive your SIN during the visit without leaving your documents behind. By mail, you send original documents, which is the slowest route and the one that puts your documents in transit.

In person is the fastest and the safest for anyone starting a job imminently. Service Canada's own guidance is that if everything is in order you get your number during the visit and keep your documents. You can request an appointment through the online service request form, and many centres also take walk-ins.

Online suits people whose documents photograph cleanly. Most rejected uploads fail on the same things: glare, cropped edges, and images that cut off a border. Photograph the document flat, in even light, with all four edges visible.

Mail is the fallback when neither of the other two works. Sending original identity documents through the post carries obvious risk, so treat it as a last resort. Start at Apply for a SIN, which routes you by status and situation.

How do you find your SIN if you already have one?

Short answer: Sign in to My Service Canada Account to view and print your number. If you cannot get into the account, your SIN appears on your income tax return, on tax slips such as a T4, on a Record of Employment, and on Registered Retirement Savings Plan contribution receipts. You do not need to apply again, and there is no fee to confirm a number you already hold.

This is the single most common reason people search for SIN information, and the answer is almost never a new application. The number is issued once. If you have worked in Canada or filed a return, the number already exists in documents you hold.

If you need something official to hand an employer or a bank, request a Confirmation of SIN. Service Canada issues it as a letter in paper or digital format, at no cost, and you can request one through your account or at a Service Canada Centre. Register or sign in at My Service Canada Account.

Employers who need to verify an employee's number contact the SIN program directly rather than asking the employee to reapply.

What happens when a 9-series SIN expires?

Short answer: A 9-series SIN expires on the same date as the immigration document that supported it. Service Canada requires the two expiry dates to match. If your SIN has expired, you may keep working while you wait for your new immigration document as long as you maintained your status, and once IRCC authorizes you to continue working you apply to Service Canada with the new document to update the expiry date.

This is where payroll problems start. Many payroll systems flag an expired 9-series number and suspend an employee automatically, even though the person is legally entitled to keep working under maintained status. The rule and the software disagree, and the employee absorbs the consequence.

Service Canada publishes the temporary-resident rules separately, and the SIN for temporary residents in Canada page is the one to check when your permit situation is unusual.

The sequence that avoids it:

1. Apply to extend your work or study permit before the current one expires, so you hold maintained status.
2. When the new permit arrives, take it to Service Canada and ask them to extend the expiry date on your SIN record.
3. Give your employer the updated Confirmation of SIN showing the new expiry date.

If payroll challenges you during the gap, the point to make is that maintained status preserves your authorization to work while the application is in progress. Bring the documentation. Do not let a pay cycle lapse while you argue the point, and get the SIN record updated as soon as the permit is issued.

What should you do after you get your SIN?

Short answer: Give the number to your employer, who is required to record it within three days of your start date. Open or upgrade your bank account, since banks ask for a SIN on anything beyond a basic chequing account and on any registered investment account. Then register for My Service Canada Account so you can view your number, update your address, and request a confirmation whenever you need one.

Your employer will pair the SIN with a federal TD1 form and a provincial one to set up payroll deductions and Canada Revenue Agency reporting. That is the legitimate use of the number, and it is one of very few.

Registering for the account early pays off later. It is where you view and print your number, keep your record current after a move or a legal name change, and generate the confirmation letter that resolves most payroll and banking questions without a trip to a Service Canada Centre.

What do you do if your SIN is lost, stolen, or misused?

Short answer: Losing the paper does not mean losing the number. Recover it from a past tax slip, a return, a Record of Employment, or your account, and request a free Confirmation of SIN if you need something official. If you suspect fraud, place alerts with Equifax and TransUnion, report it to the Canadian Anti-Fraud Centre and your local police, and contact the SIN program.

Service Canada issues a new number only where an investigation confirms the old one was compromised. That is deliberate and it is rare. In nearly every case the number stays and only the paperwork is replaced.

If your number has been exposed in a data breach, monitor your credit file rather than assuming a new number is the remedy. Service Canada treats Social Insurance Number fraud and data breach as its own service path, separate from applying or updating a record, and the steps for a damaged, forgotten or lost Social Insurance Number are published separately again.

After a move or a legal name change, update your Social Insurance Number record so the details Service Canada holds match your current documents.

What mistakes do newcomers make with a SIN?

Short answer: Putting the number on a resume, handing it over to anyone who asks by email or text, forgetting to update Service Canada after a permit renewal, uploading document scans that crop or glare, arriving with only one document, and assuming a study permit allows work when it does not say so.

No employer may ask for your SIN before making a written offer you have accepted. It has no place on a resume or a job application form.

Nobody from a bank, the Canada Revenue Agency, or Service Canada will email or text you asking for the number. Every message that does is a scam. Contact the agency using a number published on canada.ca instead of replying.

Anyone charging you a fee to obtain a SIN is running a scam as well. The application costs nothing through every channel.

The permit renewal step is the one that costs money. A pay interruption from an expired SIN record takes a single visit to prevent and weeks to unwind afterwards.

Frequently Asked Questions

How do I get my SIN number in Canada? Apply free through Service Canada, online, by mail, or in person, with a primary document proving your status in Canada and a secondary document confirming your identity. In person you receive the number during the visit.

What is a SIN number in Canada? A nine-digit identifier issued by Service Canada and used to track earnings, taxes, and federal benefit eligibility. It is confidential, and it is illegal for anyone other than you to use it.

Can I walk in to Service Canada for a SIN number? Many Service Canada Centres accept walk-ins for SIN applications, and you can also request an appointment through the online service request form. Bring original documents. If everything is in order you leave with your number and keep your documents.

How do I check a SIN? Sign in to My Service Canada Account to view and print yours. It also appears on your income tax return, a T4 or other tax slip, a Record of Employment, and RRSP contribution receipts. Employers verify an employee's number through the SIN program rather than a public lookup, since no public SIN lookup exists.

How much does it cost to get a SIN? Nothing, through any channel, including a Confirmation of SIN.

Can I work in Canada without a SIN? Your employer must record your SIN within three days of your start date. Some employers will begin payroll while an application is in progress, but the number has to follow quickly.

Does my SIN change when I become a permanent resident? Yes. A temporary 9-series number is replaced by a permanent number beginning with 1 through 7 once you become a permanent resident. Apply with your permanent resident card or Confirmation of Permanent Residence.

What if I had a SIN during an earlier stay in Canada? You keep it. Rather than applying for a new number, bring your new immigration document to Service Canada and have the expiry date on your existing record extended.

Do my children need their own SIN? Yes, if you are claiming the Canada Child Benefit, opening a Registered Education Savings Plan, or listing them as dependants. A parent or guardian applies on the child's behalf.

What if Service Canada rejects my SIN application? A rejection for image quality or document type is usually explained in the notice and fixed by reapplying correctly. A rejection on status grounds points at your IRCC document, and that is worth reviewing with a consultant before you respond.

What should you do next?

Short answer: Confirm you have both documents before you go anywhere. Check that a study permit or visitor record actually states you may work. Apply in person if you have a start date coming, and register for My Service Canada Account once the number is issued.

1. Identify your primary document by status, and pick a valid secondary document showing your legal name and date of birth.
2. Confirm any study permit or visitor record states that you may work, and contact IRCC if it does not.
3. Apply in person for same-visit service, or online if your documents photograph cleanly.
4. Register for My Service Canada Account and request a Confirmation of SIN if an employer or bank needs one.
5. If you are renewing a permit and want the timing handled so your SIN record and pay never lapse, book a consultation with Go Far Global. Our Regulated Canadian Immigration Consultant (RCIC) team reviews the document set and the sequence.

Sources

• Service Canada, Social Insurance Number: https://www.canada.ca/en/employment-social-development/services/sin.html
• Service Canada, Apply for a SIN: https://www.canada.ca/en/employment-social-development/services/sin/apply.html
• Service Canada, Required documents for SIN: https://www.canada.ca/en/employment-social-development/services/sin/required-documents.html
• Government of Canada, My Service Canada Account: https://www.canada.ca/en/employment-social-development/services/my-account.html

Last updated August 15, 2026. Document requirements and procedures verified against Service Canada's published guidance on that date. Rules change; confirm the current requirements at canada.ca before you apply.