Start with a limited eligibility review and identify which work remains useful regardless of citizenship timing. A full application package may become outdated if the offer, duties or start date changes. Decide what spending to defer after discussing the uncertainty with the employer and any adviser.
Separate reusable preparation from time-sensitive work
Academic record retrieval may remain useful, while a dated employer letter or travel booking may need replacement. Ask for a written scope for any professional review so you know whether it covers nationality, professional fit or a future filing. Citizenship-related costs belong in a separate Canadian process budget and are not TN fees.
Avoid paying on the assumption that a particular U.S. employment date will accelerate citizenship. Verify route-specific government charges only once the contemplated U.S.
procedure is clear. Divide the spending into work that keeps its value and work that does not. Assembling accurate duty descriptions, locating academic and professional records, obtaining certified copies and translations, and getting an assessment of which classifications fit your present facts all retain their usefulness whatever route is eventually taken.
Preparing category-specific documents for a route you cannot currently use does not, and may have to be redone if terms or circumstances change in the meantime. Ask any adviser to identify which category each item of proposed work falls into before you authorize it. Be particularly cautious about packages priced around a route that is not presently available, and about any suggestion that early payment secures a position in a process that has not begun.
Nothing purchased now alters the nationality requirement.