A temporary SIN — a Social Insurance Number beginning with the digit 9 — is issued to individuals in Canada on temporary immigration status. It functions exactly like a permanent SIN for self-employment purposes, with one critical difference: it expires when your immigration status expires.
What a Temporary SIN Allows
A SIN starting with 9 enables everything a permanent SIN enables for self-employment:
- Provincial business name registration
- CRA Business Number registration
- GST/HST account setup
- Opening a business bank account (at most banks and all digital banks)
- Filing T1 and T2125 personal tax returns
- Signing contracts and issuing invoices
- Paying CPP contributions and building CPP retirement benefit entitlement
No government agency or bank treats a temporary SIN differently in day-to-day operations. Clients have no way of knowing what type of SIN you have, and they do not need to know.
What Changes When Your Temporary SIN Expires
A temporary SIN has an expiry date printed on it, matching your immigration document’s expiry (work permit, study permit, etc.). When your immigration status is renewed or upgraded:
- Your SIN expiry extends: Service Canada updates your SIN expiry when you renew your immigration status. Bring your new permit to Service Canada after renewal.
- CRA update required: Notify the CRA of your new SIN expiry date through CRA My Account or by calling 1-800-959-8281.
- Banking: Some banks require you to update your SIN expiry in their systems when your immigration document is renewed. Contact your bank proactively.
If your immigration status changes to permanent resident, your SIN is updated to a non-expiring number starting with a different digit — but your SIN number itself changes. Update the CRA, your bank, and all business registrations with the new SIN.
Applying for a Temporary SIN
Apply at a Service Canada Centre. Bring:
- Your original work permit or immigration document
- Your passport
- Proof of Canadian address (bank statement, lease, or utility bill)
Processing is usually same-day. You leave with a letter confirming your SIN number — the physical plastic card may not be issued; the number on the letter is sufficient for all purposes.
Practical Considerations for Self-Employed Temporary SIN Holders
- Business bank accounts: Most digital banks (EQ Bank, Wealthsimple, Wise) accept temporary SINs without issue. Big Six banks vary — some are more flexible than others at the branch level. Call ahead if you experience difficulty.
- CRA filing: File your T1 return normally each year. Your temporary SIN status does not affect your filing obligations or your refund eligibility.
- GST/HST registration: Available with a temporary SIN — the CRA does not restrict GST/HST registration based on SIN type.
- Credit building: CPP contributions you make with a temporary SIN count toward your eventual CPP retirement benefit, even if you later become a PR and your SIN changes.
Frequently Asked Questions
Can I start self-employment the day I get my temporary SIN?
Yes — as soon as you have a SIN, you can begin self-employment operations (assuming your immigration status authorizes it). Open a bank account, set up invoicing software, and issue your first invoice. Registration steps (BN, business name) can follow in the first few weeks.
What happens to my CRA account if my temporary SIN expires and I am no longer in Canada?
Your CRA account and tax filing history remain linked to your SIN. If you leave Canada, you file a departure return for the year you leave. Your CRA records do not disappear — they remain accessible and relevant if you return to Canada or if the CRA has questions about prior years.
Do clients need my SIN to pay me?
No. Clients pay based on your invoice — they do not need your SIN. Your SIN is used by the CRA and banks, not by clients. If a client asks for your SIN (unusual), verify the reason before providing it — your SIN is sensitive personal information that only authorized parties (CRA, banks, government) should receive.