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Travel Therapy Multi-State Taxes: Which Returns Do You Actually File?

Published 4 August 202613 min read

Three contracts in three states in one year does not mean paying three times. It usually does mean filing four returns, and it very often means the amount withheld from your cheques was wrong in both directions. This is the part of travel therapy taxation that our calculator deliberately does not model — it estimates one state at a time — so here is how the real thing works.

Two words that decide everything

Residency is where you live in the legal sense. For most travellers it is the state your tax home sits in — where you keep a residence, hold a driver's licence, register to vote and return between contracts. You normally have exactly one, and it does not change because you spent thirteen weeks in Arizona.

Source is where income is earned. Wages are sourced to the state where you physically performed the work. A state does not need you to live there to tax the money you earned inside its borders.

Those two ideas explain the whole system. Your resident state taxes everything you earn anywhere. Each work state taxes only what you earned there. The same dollars are therefore claimed twice — and the fix is a credit, not an exemption.

What you actually file

A traveller with a Pennsylvania tax home who worked contracts in Ohio, Arizona and Texas files: an Ohio nonresident return, an Arizona nonresident return, no Texas return at all — Texas has no income tax — and a Pennsylvania resident return covering all of it. Four returns for three contracts.

The credit that stops double taxation

Your resident state gives you a credit for income tax paid to another state on the same income. That is the mechanism, and it has one property everybody discovers the hard way:

Practical consequence: a traveller from a low-tax or no-tax home state feels every high-tax work state in full. A Florida-based therapist taking a contract in Hawaii pays Hawaii's rate and gets no relief, because Florida has no tax against which to credit it. A New York-based therapist taking the same contract pays Hawaii and then tops up to New York's level.

The reverse is the pleasant case. If your tax home is in one of the nine states with no wage income tax — Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming — then contracts in other no-tax states genuinely cost you nothing in state income tax.

Reciprocity: the exception that saves paperwork

Some neighbouring states agree that residents of one who work in the other pay tax only at home. Ohio, for example, has reciprocity with Indiana, Kentucky, Michigan, Pennsylvania and West Virginia. Where an agreement applies you skip the nonresident return entirely.

Two catches. Reciprocity is not automatic: you must give your employer the correct nonresident exemption certificate so withholding goes to your home state instead. If you do not, the wrong state withholds, you file to get it back, and you wait months. And agreements are specific pairs of states — living in a reciprocity state does not help if your contract is somewhere outside the agreement.

Ask your agency's payroll team, in writing, which state they are withholding for, before your first cheque.

Why your withholding is probably wrong

Agencies withhold based on the work state, sometimes the home state, occasionally both, and sometimes neither correctly. Three specific traps:

• No-tax work state, taxed home state. You work in Texas, live in Georgia. Nothing is withheld for Georgia all contract long, but Georgia taxes your worldwide income. Nobody sends you a bill until April. This is the classic surprise, and on a full year of travel it can run into thousands.
• Stipends muddy the picture. Only your taxable wages are sourced and taxed by states. A package that is half tax-free means the state-taxable amount is far smaller than your gross — which is why the state comparison in our state-by-state analysis matters less than travellers assume.
• Local taxes are separate again. Ohio municipalities, Pennsylvania school districts, Maryland counties, Indiana counties, Kentucky occupational taxes and New York City all sit outside the state return and usually outside the credit.

If nothing is being withheld, pay estimates

Where your home state is not receiving withholding, the answer is quarterly estimated payments rather than a single April reckoning. Both the IRS and most states charge underpayment interest even if you pay in full on the filing deadline. Setting aside a fixed percentage of every cheque into a separate account, and paying quarterly, turns a nasty April into a non-event.

What to keep during the year

• Every contract, with start and end dates and the facility's state — this is your proof of where income was earned.
• Every pay stub, showing which state was withheld for.
• All W-2s. You may receive several, and a single W-2 can list multiple states in boxes 15–17.
• Any nonresident exemption certificates you filed with payroll.
• Records supporting your tax home, which is what establishes residency in the first place.

File in the right order

Prepare the nonresident returns first, then the resident return. The resident return needs the final tax figures from the work states in order to compute the credit. Doing it the other way round is the most common cause of an amended return.

The bottom line

Multi-state filing rarely means paying twice, but it reliably means more returns, more paperwork, and a real chance that the withholding was wrong. The two things that make it manageable are boring: keep every contract and pay stub, and know before your first paycheque which state your agency is withholding for.

Our pay calculator estimates tax for the assignment state only, which is the right approximation for comparing offers and the wrong basis for a return. It is a negotiating tool, not a filing tool.

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