Clarify which professional services are included and which require a separate adviser. Immigration preparation does not automatically resolve every cross-border employment question. Sequence the advice so each answer can inform the next. The immigration assessment establishes what work is permitted where; the payroll and tax questions then apply to that arrangement rather than to a hypothetical one. Reversing the order produces a structure built for tax reasons that the immigration facts have to accommodate afterwards. Ask each adviser what it needs from the other before either begins.
Separate travel costs from legal eligibility
Budget transportation and business expenses separately from professional preparation and official charges. A convenient or inexpensive commuting plan does not establish the required immigration basis for the actual U.S. duties.
Four cost lines behave differently and should not be averaged into a per-trip figure. Petition preparation is a one-time cost borne by the employer. Government charges attach to the filing and change from time to time, so confirm the current figures from the official source rather than from an internal estimate.
Travel recurs and scales with the schedule. Separate professional advice on payroll, withholding or corporate presence is a distinct engagement with its own scope. The arithmetic that matters is not the cheapest schedule but the one the evidence supports: a plan trimmed to reduce trips, then described as an assignment it no longer resembles, costs more to correct than the travel it saved.