SIN Registration Rules Updated for Attestations

Summary#

The Regulations Amending the Social Insurance Number Regulations (SOR/2026-176) update wording and application rules for Social Insurance Number (SIN) registration. The changes clarify how people can apply (including modern, non-paper ways) and require the Canada Employment Insurance Commission to assign a SIN in some cases; the amendments came into force on August 7, 2026.

What it does#

• Clarifies the information an application must include by aligning the English and French texts of the Social Insurance Number Regulations (changing “supporting documents” to “documents” in the English text).
• Replaces a strict paper signature requirement with a broader requirement for an attestation when applying:
  • If the person being registered is 12 years of age or older, they, a parent, or a legal representative must provide the attestation.
  • If the person is under 12 years of age, a parent or legal representative must provide the attestation.
• Confirms that, where a province has an agreement to register births, the official who registers births in that province must make SIN registrations for newborns.
• Changes the rule about people who refuse to apply: the Canada Employment Insurance Commission must assign a SIN to a person who is legally required to have one if the Commission has information establishing that person’s identity and status. Previously, the Commission could but was not required to do so.
• States that applications must be made in the form and manner required by the Commission and include documents that identify the person and their status.

Who's affected#

• People applying for a SIN, including parents applying for infants and guardians applying for children.
• People who are legally required to have a SIN (the regulations refer to this group but do not redefine who that includes).
• Service Canada staff and province officials who handle birth registrations under provincial newborn registration agreements.
• Employers and other organizations that rely on SINs may be indirectly affected because the rules about assignment and what counts as a valid application are clarified.

Why it matters#

• The changes match the rules to how SIN applications actually work today (many are digital or use attestations rather than paper signatures). This should reduce confusion and make it clearer when an application is valid.
• It removes a discretionary gap: the Commission must now assign a SIN when a person who is required by law refuses to apply but can be identified. That could affect people who try not to register.
• The wording fix between English and French removes a source of legal uncertainty about what documents are required.
• The government says there are no new costs and no operational changes for applicants or staff; the main effect is clearer rules and better alignment with modern application methods.