Read the general professional work overview
A reference letter is useful for describing what somebody actually does. It cannot create a qualification that the profession’s own rule demands, and it is not the employer’s support letter on which a TN case turns. Separate the three documents before anybody books travel.
Describe the proposed professional activity
The document that carries a TN case is the U.S. employer’s letter, and it has a fixed job: name the listed profession, describe the duties in enough detail to be matched against it, state the temporary period, and set out the remuneration. Hypothetical example: a Canadian instrumentation specialist is offered work by a U.S. manufacturer, and his supervisor writes a warm letter praising his diagnostic ability. That letter identifies no profession, no duration and no payer. Ask the employer to draft the operative letter first, then treat the reference as an attachment supporting the duties it describes. Where the work could be read as falling under more than one listed profession, choose one deliberately and make the letter consistent with it, because the credential rule that applies from that point onward is that profession’s own rule and no other.
Preserve the exact qualifications
TN eligibility starts with citizenship of Canada or Mexico — permanent residence in either country is no substitute — and then runs through the specific requirement attached to the chosen profession. Some entries require a particular degree; some accept a post-secondary diploma together with a stated number of years of experience; some require a provincial or state licence. Read the entry itself rather than a summary of it, because time in the field counts only where that entry says so, and experience is not a general substitute for a degree the entry demands. A degree awarded outside Canada, Mexico or the United States needs a reliable credential evaluation, which is a wholly different exercise from a certified translation and cannot be replaced by one. If that evaluation is not yet in hand, it is a scheduling problem to solve before travel, not something a supervisor’s endorsement can bridge at the border.
Review the actual employment arrangement
TN presumes an employer and an employee, so ownership belongs in the file rather than out of it. Disclose any interest the applicant holds in the U.S. entity: providing services to a U.S. company the applicant solely owns or controls falls outside what the classification permits, while a minority interest, or foreign ownership of the employer, is no blanket bar and should be explained plainly. Say who directs the work, who pays for it, and where it will be performed if a client site is involved. A Canadian citizen may generally seek TN admission at a port of entry or preclearance without first obtaining a TN visa; a Mexican citizen generally needs that visa. Neither route removes the requirement that the stay be temporary, and neither substitutes for a state practice licence where the profession requires one before the work may lawfully begin.
What else is on your mind?
Is a matching job title enough for TN?Can years of experience replace a degree for TN?Can my own U.S. company employ me under TN?Can my spouse work if I hold TN status?Editorial source review: 2026-09-07. General preparation guidance, not an individual assessment.