Applying for a SIN for Children Versus Adults: What Changes by Age

A family of five landing in Canada doesn’t file one SIN application — it files up to five, and who signs each one depends entirely on age. Applying for a sin for children versus adults follows a clean rule once you know it, but it trips up plenty of newcomer families who assume, reasonably, that a parent handles the paperwork for the whole household.

The age-twelve line

Can a child apply for their own sin is really a single-number question: anyone twelve years of age or older can apply for their own Social Insurance Number. Below that age, a parent or legal guardian applies on the child’s behalf. There’s no separate process or extra hurdle for the child’s own application at twelve and up — it’s the same online, mail or in-person channel every adult uses, with the tailored document checklist the application tool provides based on status.

Parent applying for a child’s social insurance number — what’s needed

For a child under twelve, a parent applying for a child’s social insurance number needs the child’s primary identity document — for a Canadian-born child, that’s the birth certificate; for a child who arrived as a permanent resident, it’s the PR card, Confirmation of Permanent Residence, or Record of Landing; for a child on a temporary resident status, it’s the relevant permit or record. The application itself can be submitted online, by mail, or in person at a Service Canada Centre, and there’s no fee at any age or for any family member — a fact worth stating outright, since a legitimate government service occasionally attracts scam operators charging for something that costs nothing.

Sin application age rules canada — the temporary-resident wrinkle

Here’s where sin application age rules canada get more complicated for a newcomer family specifically: a temporary resident of any age — adult or child on a work or study permit — receives a 900-series SIN that expires along with their underlying immigration document, rather than the permanent SIN that citizens and permanent residents get. That means a family arriving on temporary status, with children of varying ages, may be tracking several different SIN expiry dates simultaneously, each tied to a different family member’s own permit. Renewing an immigration document doesn’t automatically renew the linked SIN — that’s a separate step, and it’s easy for a family juggling several permits to miss one.

The practical timeline for a newcomer household

Putting this together into an order: as soon as each family member’s immigration status is confirmed on arrival — landing as a PR, or receiving a work or study permit — that person (or their parent, if under twelve) should apply for a SIN. Processing typically runs about five business days for a complete online application, or around twenty by mail. For a family with children spanning both sides of the age-twelve line, it’s worth applying for everyone at roughly the same time rather than staggering it, simply so there’s one settling-in errand rather than several spread across different weeks.

Where to get help with your specific situation

The rules above describe how the SIN system works generally. Any question about a specific family member’s status, document eligibility, or what happens if a temporary permit is delayed is a matter for Service Canada directly, or a licensed immigration consultant if it intersects with the underlying immigration application — not something to resolve by comparing notes with another newcomer family whose situation may differ from yours.