Quick answer: Give your Social Insurance Number to an employer after you are hired and need to be placed on payroll. The Government of Canada says an employer must obtain an employee’s SIN within three days after the employee starts work. Be cautious if a recruiter requests it on an initial application or before a real job offer.
Why does an employer need your SIN?
Employers use the SIN to report employment income and deductions to the Canada Revenue Agency and to prepare tax slips. A SIN is not a general identity card and should not be used casually.
When is it reasonable to provide it?
| Stage | Provide SIN? |
|---|---|
| Viewing a job advertisement | No |
| Submitting a resume | Normally no |
| Initial interview | Normally no |
| After a legitimate hire, for payroll | Yes, through a secure process |
| Random text or messaging-app request | No—verify independently |
How to share your SIN safely
- Verify the employer and written offer.
- Ask why the SIN is needed and who will access it.
- Use the employer’s secure onboarding system or provide it directly to authorized payroll/HR staff.
- Avoid ordinary email or messaging apps when a secure option exists.
- Do not send a photo of every identity document unless legitimately required.
- Keep a record of where you provided it.
Do you need a SIN card?
Canada no longer issues plastic SIN cards. You generally provide the nine-digit number and, when requested, a confirmation document. Protect the number rather than carrying it unnecessarily.
What if your SIN begins with 9?
A SIN beginning with 9 is issued to temporary residents and normally has an expiry date tied to immigration documentation. Keep your SIN record current after receiving a new permit. Read our guide on working with an expired SIN while waiting for a permit.
Job-scam warning signs
- The “employer” hires without a real interview
- The email domain does not match the company
- You are asked for SIN, banking and passport details immediately
- You must pay for equipment, training, LMIA or a job offer
- You receive a cheque and must forward money
What if you already shared your SIN with a scammer?
Document what happened, contact the Canadian Anti-Fraud Centre, review credit reports and follow Service Canada guidance for suspected SIN misuse. A new SIN is not automatically issued simply because information was exposed.
Frequently asked questions
Can an employer ask whether I can legally work in Canada?
Yes. Employers can confirm work authorization. That does not mean every recruiter needs your SIN during the application stage.
Can a landlord or cellphone company require my SIN?
A SIN may be requested for a credit check, but alternative identification may be available. Ask whether providing it is optional.
Should I put my SIN on my resume?
Never. A resume may be shared widely and does not need a SIN.
Official sources
Review Service Canada’s SIN protection guidance and the Canada Revenue Agency’s employer SIN rule.
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