Start with the TN eligibility and application overview
Explain the profession without inventing project details
TN requires temporary activity in a listed USMCA profession and its particular qualifications for Canadian or Mexican citizens; Canadian permanent residence alone is insufficient. Identify genuine duties, employer, pay and duration. A confidential project label does not establish the profession, and invented generic duties are not a suitable replacement for the actual proposed work. Sequence the review by matching duties to the listed category before finalizing a support letter. The signed engagement, statement of work, and supervisor’s explanation ordinarily settle whether the description is accurate. A Canadian normally requests TN classification during entry inspection or preclearance; an eligible employer can instead submit an I-129 petition to USCIS. Neither procedure cures a mismatch between the real work and the chosen profession.
Keep the qualification and employment tests complete
Experience cannot universally replace required education. A degree from outside Canada, Mexico or the US needs reliable foreign-credential evaluation, while US practice licensing is separate. Services to a US entity solely owned or controlled by the applicant are prohibited TN self-employment; foreign ownership alone is not a blanket exclusion. Canadians generally may seek visa-exempt TN admission, whereas Mexicans generally need a visa, with applicable petition options reviewed separately. Confidentiality does not itself waive these requirements. The reviewer should decide early whether the U.S. recipient is an independent employer or an enterprise the applicant controls. That fact is settled by ownership records, governance documents, and the actual right to direct the work, not by a carefully worded services agreement. Collect the credential record before travel planning, then reconcile the employer letter with it. A temporary intent statement cannot replace the required profession-specific evidence.
The credential attached must match the profession’s own rule
Each listed profession has its own credential language, and some listings offer alternatives such as a licence or a post-secondary diploma combined with stated years of experience. A degree can be conferred weeks or months before the registrar releases the final transcript, which leaves an applicant holding proof of graduation that no single document yet shows. Engineer appears on that list with a baccalaureate degree or a provincial or state licence as the qualification. The applicant carries the citizenship requirement, since the principal must be a Canadian or Mexican citizen, along with the qualification requirement attached to the specific listed profession, which a degree earned in an adjacent field does not automatically satisfy. The governing condition does not bend for goodwill: the position must sit within a listed occupation and the applicant must hold the qualification that occupation specifies, so a role that quietly becomes a generalist post during a restructure may no longer fit. Where the diploma-and-experience route is used, ask counsel how the three years are counted in relation to the award, since the answer decides which employment letters are worth chasing. The issuing institution's transcript or confirmation letter is the record that resolves what the credential actually says.
Sources reviewed 2026-09-07. This guide covers a preparation focus; it is not an individual eligibility assessment.