Direct answer
A multi-state or locum physician should track where services are physically performed, how each payer reports the income, which states require returns or business registrations, and how withholding and estimated payments will be coordinated. Residency alone does not answer every state tax question.
Track the location of the physician services
Maintain a calendar showing work dates, facilities, states, contracts, and related payments. State sourcing often follows where the physician performed services, but residency, reciprocity agreements, entity rules, and local taxes can change the filing analysis.
Reconcile contracts, tax forms, and deposits
Match each W-2 or 1099 form to the payer, contract, state, and recorded income. Investigate state wages or withholding that do not align with the work calendar before filing.
| Record | Question it helps answer |
|---|---|
| Work-location calendar | Where and when were physician services physically performed? |
| Contracts and assignment letters | Who engaged the physician and what location was specified? |
| W-2 and 1099 forms | How did each payer report income and state withholding? |
| Travel and temporary-living support | Which costs have a documented business purpose and tax basis? |
| Entity and payroll registrations | Where may the physician or entity have filing duties? |
Coordinate resident and nonresident returns
A resident state may tax broad income and allow a credit for qualifying taxes paid elsewhere. Credit mechanics, income definitions, and filing thresholds vary, so the returns should be modeled together rather than prepared state by state in isolation.
Review the business footprint
A physician using an entity should review foreign registration, payroll, professional-practice restrictions, state tax elections, and annual filing duties before assuming one home-state entity covers every assignment. Legal and payroll advice may be needed.
Primary sources
Frequently asked questions
Does a physician file only in the state of residence?
Not necessarily. Work performed in other states can create nonresident filing obligations, while the resident return may provide a qualifying credit under that state’s rules.
Can a physician deduct every locum travel expense?
No. Tax home, assignment length, reimbursement, business purpose, documentation, and personal components affect the treatment.
Should a locum physician use one entity in every state?
Do not assume so. Professional-entity, registration, payroll, and tax rules vary by state and should be reviewed before the assignment begins.