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Understanding Your SIN Number

Your Social Insurance Number (SIN) is a nine-digit number that lets you work in Canada and access government programs and benefits. It's one of the most important numbers you'll have, which also makes it one you need to protect carefully.

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In this guide

What a SIN is used for

  • Working in Canada. Your employer needs your SIN to report your income.
  • Filing taxes with the Canada Revenue Agency (CRA).
  • Government programs and benefits, such as Employment Insurance and the Canada Pension Plan.
  • Some financial accounts, where your bank needs it for tax reporting.

Who can get one

Canadian citizens, permanent residents, and temporary residents whose permit allows them to work can apply for a SIN. Not every temporary status qualifies, so confirm your eligibility with Service Canada if you're unsure.

Temporary SINs

If you're a temporary resident, your SIN will start with the number 9 and will expire when your permit does. If you get a new permit or become a permanent resident, you'll need to update your SIN record.

How to apply

  1. Step 1: Gather your documents

    You'll need your immigration documents, such as a work permit or your permanent resident documents, plus identification. Service Canada lists exactly which documents it accepts.

  2. Step 2: Apply online, by mail or in person

    Many people can apply online through Service Canada. Others visit a Service Canada Centre, where you bring your original documents.

  3. Step 3: Receive your SIN

    Timing varies. Applying in person is often quickest, while online and mail applications can take longer.

Who is allowed to ask for it

WhoWhy they may ask
Your employerTo report your pay and deductions. They generally ask after you've started work.
Your bankFor tax reporting on interest you earn. You can often open a basic account without it.
The CRA and government programsTo file taxes and deliver benefits.
Schools and collegesTo issue tax slips for tuition, in some cases.
Landlords, shops, phone companiesNot normally. Ask why before you share it.

Common questions

What if I lose my SIN?

Your number doesn't change. If you lose the confirmation letter, contact Service Canada to confirm your number or ask for a replacement. Don't use unofficial websites that offer to “recover” your SIN for a fee.

What if my name changes?

Contact Service Canada to update your record after a legal name change, so your SIN matches the name on your tax slips and ID.

Protecting your SIN

  • Store your SIN confirmation in a safe place. Don't carry it in your wallet.
  • Share it only when it's legally required: with an employer after you've been hired, with your bank, or with the CRA.
  • You don't need to put your SIN on a job application. Employers generally ask for it after you start work.
  • Never send your SIN by email or text message.

Navak provides general information only. It is not legal, immigration, financial or tax advice.

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