Coordinate the last day, application route, and authorized new start before making irreversible commitments. There is no universal sequence that fits every worker’s status and travel history. Filing for a change is not a general TN permission to begin working for the new employer while waiting.
Use dates that can be verified
Start with the current admission expiration and actual employment end date, then have the planned gap assessed. Ask the new employer for flexibility if the decision or admission takes longer than expected. Where travel is proposed, review its effect on any pending application before departure.
After authorization, confirm the applicable effective dates before onboarding involves productive work. A recruiter’s target date and a government decision date are different planning facts. The first review should produce a dated sequence with the uncertain points marked, not a completion estimate.
Start from two verifiable facts, the current admission expiration and the actual last day with the current employer, then have the intended gap assessed against them. Ask the new employer for its required start date and treat it as an input rather than a constraint, since no route guarantees a date. The output should identify which steps depend on travel, which depend on the employer, and which depend only on the applicant.
Ask explicitly what the sequence would look like if a step takes longer than expected, because that alternative is the part worth knowing before a resignation letter is delivered. Filing for a change is not permission to begin working for the new employer while waiting.