Locum Tenens Taxes in Texas

This is the single most common and most expensive misconception we see from Texas-based locum physicians. The logic sounds airtight: "I'm a Texas resident, Texas has no income tax, therefore I owe no state income tax." The problem is that state income tax isn't only a function of where you live. It's also, independently, a function of where you physically perform the work.

Source-State Taxation

Nearly every state that levies an individual income tax applies what's called source-state taxation to nonresidents: if you earn income from work physically performed inside that state's borders, the state can tax that income, even if you've never lived there, never intend to live there, and file zero other returns in that state. This rule exists specifically so that out-of-state workers can't earn money in a state's economy, use its roads, hospitals, and infrastructure, and walk away having paid that state nothing.

A Texas resident who accepts a 10-week locum assignment at a hospital in Sacramento is, for those 10 weeks, earning California-source income. California doesn't care that the physician's driver's license, home, and family are in Austin. It taxes the wages earned for work performed inside California, under its own nonresident withholding and filing rules.

This is also why the misconception is so sticky. If you're a Texas-based locum who only ever takes assignments in Texas, Florida, or another no-tax state, the belief "I owe no state tax" is completely correct, and it can hold up for years without being tested. The trouble starts the first year you take a higher-paying assignment in California, New York, Oregon, or any other state with a meaningful income tax, and assume your Texas address makes that income exempt too.

None of the savings described in this guide are available to someone who merely claims Texas residency on paper. Both the IRS (for purposes of the tax home and travel-deduction rules covered in depth in our tax home guide) and other states' tax authorities (for purposes of deciding whether you've actually left their tax net) look at the same underlying question: is Texas a genuine home base, or a convenient mailing address?

The evidence that matters is concrete and checkable, not aspirational:

• Texas driver's license — issued and kept current, not left to expire while you live elsewhere
• Texas vehicle registration — your primary vehicle registered and inspected in Texas
• Texas voter registration — registered and, ideally, actually voting in Texas elections
• A genuine Texas residence — a lease or mortgage you actually pay and actually use, not a nominal arrangement with a relative
• Return trips you can document — a calendar or travel log showing you actually come back to Texas between assignments
• Local financial footprint — Texas bank accounts, and other accounts updated to a Texas address

This section deliberately doesn't re-walk the full IRS three-factor tax home test or the itinerant-worker rules; those are covered in detail in the Locum Tenens Tax Home Guide. The point here is narrower: the same kind of genuine, documented connection that establishes a tax home for IRS travel-deduction purposes is also what makes a state-residency claim to Texas defensible against another state's tax authority.

Once your Texas residency is genuinely established, here's exactly what it does and doesn't do:

The pattern is straightforward: Texas residency removes one layer of tax, not every layer. A locum physician who works exclusively in Texas or other no-tax states pays no state income tax at all, and that's a real, substantial advantage over a similarly situated physician who's a resident of a high-tax state. But the instant an assignment is physically performed in a taxable state, that state's tax applies to the income earned there, independent of the physician's Texas residency.

There's one more piece worth naming: because Texas has no income tax, there's also no Texas resident credit to claim for taxes paid to other states. Resident-credit systems (where your home state gives you a dollar-for-dollar credit against tax it would otherwise charge on income also taxed by another state) exist to prevent double taxation for residents of states that do have an income tax. Texas has nothing to credit against, which sounds like a gap but isn't one in practice: you were never going to owe Texas tax on that income anyway, so there's no double taxation to relieve. You simply pay the nonresident state's tax and nothing more.

Illustrative example, not a specific client outcome; state tax rates and rules referenced are 2026 approximations that require verification before publish. Dr. Reyes is a genuine Texas resident, driver's license, home, and voter registration all in Austin, who works three locum assignments in one tax year:

• 16 weeks in Texas, earning $160,000
• 13 weeks in California, earning $150,000
• 10 weeks in New York, earning $110,000

Total annual income: $420,000.

Applying approximate nonresident effective rates (these vary based on total income, deductions, and each state's specific nonresident apportionment method, and must be confirmed before relying on them): California's nonresident tax on the $150,000 sourced there might run in the neighborhood of $12,000-$14,000, and New York's nonresident tax on the $110,000 sourced there might run in the neighborhood of $7,000-$8,500. Call it roughly $19,000-$22,500 combined.

Compare that to a physician with identical income and identical assignments, but who is a resident of California instead of Texas. That physician would owe California tax on their entire $420,000 of income (with a credit for tax paid to New York on the New York-sourced portion), not just the $150,000 earned there. Being a genuine Texas resident is what limits Dr. Reyes's state tax exposure to only the $260,000 actually earned in taxable states, rather than the full $420,000.