TD does not grant employment permission. A spouse’s administrative help for the business needs assessment under an appropriate work-authorized basis, even if they return to Canada the same day. The principal’s schedule and authorization cannot be extended to the spouse by describing the assistance as incidental.
Separate accompanying travel from work
Record the spouse’s intended activities and any independent immigration basis. Do not rely on unpaid assistance without reviewing its actual nature. If the spouse plans only permitted non-work activities, those facts should be described accurately rather than mixed into the employer’s staffing commitments.
TN analysis starts with eligible Canadian or Mexican citizenship, a listed professional occupation, the required qualifications, and a genuine temporary engagement for a US employer. It cannot be used where the applicant is in substance self-employed. A Canadian outside the country may request TN admission through border inspection or preclearance, or the employer may submit an I-129 petition to USCIS when that route fits the facts. Separate the principal's proposed employment from every relative's intended activities. A spouse or child may travel as a dependent when eligible, but a dependent's presence does not enlarge the principal's work authority or create permission for the relative to work. Review passports, relationship documents, prior admission records, and the realistic household plan before travel. Problems arise when a family member informally takes on customer, payroll, or office tasks that were never assessed independently. Hypothetical example: A cytogenetics technologist plans a temporary laboratory assignment while her spouse hopes to organize bookings for a neighbour's US tutoring business. They keep the dependent travel plan separate and obtain advice on the spouse's proposed activity before treating it as harmless help.