Read the general professional work overview
Hypothetical example: a chemical engineer completes six-week turnaround assignments for the same U.S. plant three separate times in one year. TN is available only where the work falls in a USMCA Appendix 2 listed profession, such as the engineer entry, and a trade role on the same turnaround would not qualify however skilled it is. Each assignment should be documented as its own defined project with its own dates and scope, rather than summarized as one continuous engagement, so the pattern reads as repeated temporary entry tied to real project need rather than an undisclosed permanent posting.
Why the pattern itself draws scrutiny
A worker returning to the same U.S. employer for a third short assignment in a single year presents a pattern that an officer reviewing the case may reasonably want explained, because repeated entries can look, from the outside, like an attempt to maintain de facto continuous residence through a series of technically separate trips. That is not what is happening in a genuine turnaround-driven schedule, where each assignment is tied to a specific, scheduled outage with its own defined scope and end date, but the burden sits with the applicant and employer to make that clear through documentation rather than assuming the pattern will be read charitably on its own.
Documenting each assignment as its own project
The practical fix is treating each turnaround as a discrete, fully documented project: its own support letter naming the specific facility and outage, its own defined start and end date driven by the actual turnaround schedule, and its own description of the professional duties involved for that assignment specifically. Reusing a single generic letter across all three assignments, or describing the arrangement as ongoing rather than project-based, undermines the very distinction the applicant needs to draw between temporary entry and continuous residence, so the extra effort of writing each letter separately is directly protective of the case.
What not to claim, and what to say instead
It is a mistake to describe a repeated pattern as evidence of a strong, ongoing relationship with the U.S. employer in a way that implies the worker is effectively based there; that framing cuts against the temporary-entry requirement TN status depends on. The accurate and defensible framing is narrower: a Canadian professional whose employer periodically needs the same specialized skill set for scheduled, time-limited outages, each one independently justified by the underlying turnaround schedule. Keeping the language and documentation focused on the project-by-project nature of the work, rather than the ongoing nature of the employment relationship generally, keeps the filing consistent with what TN status actually authorizes.
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.