Your first official step toward working in Canada is getting a Social Insurance Number (SIN). This free, nine-digit number is your key to employment, taxes, and government benefits. This guide walks you through applying, the documents you need, what your employer will ask for, and what your pay stub and T4 slip mean.
This is general information, not legal, financial, or immigration advice.
Service Canada — Social Insurance Number
The Social Insurance Number (SIN) is a nine-digit number issued by the federal government that you need to work in Canada and access government programs and benefits. Temporary residents receive a SIN beginning with 9 that expires on the same date as their immigration document, and it must be updated when that document is renewed. Applying for or updating a SIN is always free — any website charging a fee is not official.
Service Canada — Apply for a SIN
You can apply for a SIN three ways: online through Service Canada, in person at a Service Canada Centre, or by mail. For newcomers, applying in person is usually fastest — if your documents are complete, you receive your SIN confirmation letter at the same visit. Note that plastic SIN cards are no longer issued; the confirmation letter is your official record. Use the office locator on canada.ca to find your nearest centre.
Service Canada — Required documents
Your primary document depends on your status: permanent residents bring their PR Card or Confirmation of Permanent Residence (COPR); temporary residents bring a work permit, or a study permit that explicitly authorizes work. Bring your valid passport as well. Documents must be originals — photocopies and phone photos are not accepted in person. Always check the official Service Canada list for your exact situation before you go.
Your immigration status — not your SIN — determines your right to work. Permanent residents and citizens can work without restriction; work-permit holders must follow the conditions printed on their permit. Eligible international students may work limited hours during studies; because the hour cap has changed in recent years, check the current figure on the IRCC website. Working outside your permit's conditions can jeopardize your status.
Service Canada — SIN and employers
By law, you must give your SIN to your employer within three days of starting work so they can report your pay and deductions correctly. You'll also complete federal and provincial TD1 forms, which determine how much income tax is withheld. If your SIN starts with 9, the employer must verify your immigration document's expiry date — this is routine. You'll typically also provide banking details for direct deposit; you should never leave your original passport with an employer.
Service Canada — Protect your SIN
شماره SIN شما کلید هویت مالیتان است و سوءاستفاده از آن میتواند به سرقت هویت و وامهای جعلی به نام شما منجر شود. این شماره را فقط در موارد قانونی به اشتراک بگذارید: کارفرما، اداره مالیات (CRA)، بانک برای حسابهای بهرهدار، و برنامههای دولتی. صاحبخانه، فروشگاهها و اغلب فرمهای معمولی حق ندارند SIN شما را الزامی کنند. نامه تأیید SIN را در جای امن نگه دارید و آن را در کیف پول حمل نکنید.
Your SIN is the key to your financial identity, and misuse can lead to identity theft and fraudulent credit in your name. Share it only when legally required: with your employer, the CRA, your bank for interest-earning accounts, and government programs. Landlords and shops cannot require it. Store your confirmation letter safely and never carry it in your wallet.
Don't be surprised when your first pay stub shows less than your agreed wage: employers legally deduct income tax, Canada Pension Plan (CPP) contributions, and Employment Insurance (EI) premiums. By the end of February each year, your employer issues a T4 slip summarizing the previous year's income and deductions, which you need to file your tax return. Filing is worthwhile even on a low income, since many benefits and credits are triggered by your return. Deduction rates change yearly — check current figures on the CRA website.