A Canadian citizen does not normally need to apply for a TN visa. Instead, application can be made at a port of entry. If, however, you are a Canadian living in another country with a non-Canadian spouse and children, you would need a visa to allow your spouse and children to be able to apply for a visa to accompany or join the NAFTA Professional, as a TD visa holder (the TD visa is a temporary visa for the spouse or children of a TN visa holder).

To apply for a TN visa in this situation, you would follow the requirements for Mexican citizens.

Canadian citizens may apply directly at a U.S. port of entry by providing the following:

• A request for admission under TN status to the Department of Homeland Security, Customs and Border Protection, U.S. immigration officer
• Employment letter
• Proof of professional qualifications such as college/university transcripts, licenses, certificates, degrees and employment records which establish qualification for the prospective job.
• Proof of ability to meet any license requirements
• Proof of Canadian Citizenship
• Payment of the fee of US$50

Spouses and Children

Canadian citizen spouses and children do not need visas, but they must have the following documents at the port of entry:

• Proof of Canadian citizenship
• Proof of relationship to the principal applicant, such as marriage certificate and birth certificate
• Photocopies of entry documents of the principal applicant

If the spouse and children are not Canadian citizens, they must get a TD nonimmigrant visa from a U.S.

embassy or consulate. They must contact the U.S. embassy or consulate that serves their area for information on how to make visa applications.

Source: USCIS