Talk to ten travel therapists about housing stipends and you will hear ten different mental models for how they work. Most are partly right and partly wrong, and the partly-wrong parts are where travelers leave money on the table or, worse, end up with a tax problem they did not see coming.
This issue is about the math. Specifically: how GSA per diem rates set the ceiling, what "duplication of expenses" actually requires, what you can and cannot pocket tax-free, and a worked example so you can see the dollars on a real assignment. None of this is legal advice. It is a plain-English summary of how the system actually behaves, based on IRS guidance and what travelers report on the ground.
How GSA Per Diem Rates Work
The General Services Administration (GSA) publishes maximum per diem rates for every county in the contiguous United States, plus separate higher rates for high-cost metro areas. There are two parts to a per diem rate: a lodging portion (housing) and a meals & incidental expenses (M&IE) portion. Together they cap how much your agency can pay you tax-free in each category for an assignment in that location. You can look up any city's current rates at the GSA per diem lookup tool.
Two important things about these rates:
- They are ceilings, not floors. Your agency can pay you less than the GSA maximum (and frequently does). They cannot legally pay you more than the GSA maximum and call it tax-free.
- The 2026 federal fiscal year rates took effect October 1, 2025. Several West Coast and Northeast metros saw notable increases this cycle.
Always ask for the breakdown if you do not see it.
The Duplication-of-Expenses Requirement
The reason housing stipends are tax-free is that the IRS treats them as reimbursement for the additional cost of being away from your tax home for work. The legal foundation is in IRS Publication 463 (Travel, Gift, and Car Expenses) and the Topic 511 guidance. The key concept is duplication of expenses: you are paying for two places at once — your tax home (where you live when you are not on assignment) and your assignment housing.
If you are not actually paying duplicated expenses, the stipend is not legally tax-free, even if your agency paid it as if it were. Common situations where this trips travelers up:
- Living with parents and not paying real rent.
- Splitting one apartment with a partner. If you and a partner both take stipends but only one of you actually pays rent, only one of you is legally pocketing tax-free money.
- Sharing assignment housing with another traveler.
- Letting your tax home lapse.
We will dig into the full set of tax-home rules in Issue 11.
What You Can Actually Pocket Tax-Free
Within the GSA cap, you can pocket the difference between your actual housing cost and your stipend tax-free, provided you maintain a valid tax home. This is the entire reason travel therapy is financially attractive. A few examples of how that works in practice:
GSA caps shown are illustrative ranges based on 2026 fiscal-year rates. Always look up the exact county rate before signing.
The pattern: the difference between high-cost and standard cities looks dramatic on paper, but the rents in those high-cost cities are also dramatically higher. The pocketable margin is usually larger in mid-tier metros than in either extreme, because rents in mid-tier cities lag the GSA caps more.
Worked Example: $2,800 Stipend in San Diego
That is why the tax-free structure is worth more than the equivalent number of taxable dollars — how much more depends on your bracket, your state and your filing status.
That is the real argument for managing your stipend math carefully — not "free money," but "money taxed at zero instead of taxed at thirty." Over a full year of contracts, the gap compounds into something material. Our companion site traveltherapystipend.com has the calculator if you want to plug in your own numbers.
Common Mistakes
The mistakes we see most often:
- Spending the entire stipend on rent. If your stipend equals your rent, you have not pocketed anything — you just got reimbursed. Every dollar of stipend that exceeds your housing cost is the actual financial benefit. Aim to find housing meaningfully below your stipend, not equal to it.
- Picking the highest-stipend city without checking actual rents. Mid-tier cities frequently produce a larger pocketed margin.
- Ignoring the M&IE portion. Cooking at home instead of eating out is the simplest way to pocket more of it.
- Not maintaining a real tax home. The single biggest financial mistake a traveler can make. See Issue 11 for the full breakdown.
- Forgetting that "guaranteed hours" affects stipend reduction. If a facility cancels you mid-week, many contracts pro-rate your stipend down. Read the cancellation clause.
Treat the stipend as a budget, not a paycheck. Find housing meaningfully below your stipend cap, maintain a real tax home you can document, and the difference compounds into a meaningful tax-free advantage over the year. Stipends paid above what you actually owe in duplicate expenses are not "free" money — they are an audit risk.
If you want to dig further, our sister site traveltherapyhousing.com has guides on Furnished Finder, mid-term rentals, and how to negotiate housing-only assignments when the stipend math does not work in your favor.
Sources & Further Reading
- traveltherapystipend.com — stipend mechanics and live calculator
- traveltherapytax.com — tax-home rules and audit guidance
- traveltherapyhousing.com — housing search resources
- GSA — Per Diem Rates Lookup (current fiscal year)
- IRS Publication 463 — Travel, Gift, and Car Expenses