The short answer: your tax-free per diem is tied to the days you are actually away and working, so when you miss a shift, get called off for low census, or work a partial week, the agency can prorate or claw back part of that stipend. This is not the agency being stingy — it is how a compliant tax-free reimbursement is supposed to behave. Knowing the rule ahead of time keeps a canceled shift from quietly shrinking your paycheck and creating a tax problem you did not see coming.
Why per diem is tied to days worked
Per diem is a daily reimbursement for the cost of being away from your tax home, paid tax-free under your agency's accountable plan. The key word is daily. The tax-free treatment depends on you actually incurring away-from-home expenses for a work day. The IRS lets an employer reimburse up to the federal per diem rate for each day you are away on business without taxing it, but the days have to be real working days away from home. If the agency keeps paying you the full daily stipend for days you were not working and not legitimately away, that excess starts to look like disguised wages — and disguised wages are taxable.
That is the engine behind every clawback policy. The agency prorates your stipend to protect the tax-free status of the money it does pay. A company that paid a fixed weekly stipend no matter how many shifts you worked would be exposing both of you to having those payments reclassified as taxable income.
How agencies actually handle missed shifts
Policies vary, but most fall into a few patterns. Read your contract for the exact mechanics before you sign, because the differences add up over a 13-week assignment.
- Daily proration. The weekly stipend is divided by your scheduled shifts, and each missed shift removes one day's worth of stipend.
- Guaranteed-hours cushion. Some contracts protect your full stipend as long as the facility — not you — cancels the shift and your guaranteed hours are honored.
- Make-up shifts. Many agencies let you work an extra shift later in the week to "make up" a missed one and keep the stipend whole.
- Call-off penalties. If you call out, some contracts dock not just the day's stipend but an additional penalty, while a facility-driven cancellation may be treated more gently.
A worked example
Say your weekly stipend is $1,050 across three 12-hour shifts — about $350 a day. You catch the flu and miss one shift. Under straight daily proration, you lose roughly $350 of tax-free stipend for that week, on top of the taxable wages for the hours you did not work. Miss two shifts in a bad week and you are down around $700 in stipend alone. Over a contract, a couple of sick days and a low-census call-off can quietly erase a thousand dollars or more of the tax-free money you were counting on.
The travel-day rule most nurses miss
There is a related wrinkle on the first and last days of an assignment. Under the GSA rules that govern federal per diem, the meals and incidental expenses portion is paid at only 75% on travel days — the day you arrive and the day you leave. Agencies that follow the GSA method may prorate your M&IE stipend the same way at the start and end of a contract, so the first and last weeks can come in lower than the middle weeks even if you work every scheduled shift.
Are the stipends still tax-free if I miss shifts?
The portion you receive for days you genuinely worked away from home stays tax-free, as long as it does not exceed the federal rate. For the 2026 fiscal year, the standard GSA per diem is $178 a day — $110 for lodging and $68 for meals and incidentals — and many destination cities are higher. The risk is on the other side: if your agency overpays relative to days actually worked and away, the excess can be taxable. Proration is what keeps you on the safe side of that line. For how the daily ceilings work and whether your city pays more than the standard rate, see our guide to travel nurse per diem rates for 2026.
How to protect your pay
Before you sign, ask the recruiter four questions in writing: how is the stipend prorated for a missed shift, does a facility cancellation count differently from a personal call-off, can I make up a missed shift the same week, and are my guaranteed hours stipend-protected? Then keep your own record of every shift worked, canceled, and made up, so you can check your pay stubs against the policy. To see whether the stipend you are being offered is even competitive with the federal rate for your assignment city, run it through our Per Diem Checker before you negotiate.
Frequently asked questions
Can my agency really take back per diem I already received?
Yes, if your contract allows it. Because the stipend is tied to days worked, agencies commonly recover overpaid per diem by reducing a later paycheck when you miss shifts. The recovery is governed by the contract you signed, which is why reading the proration clause before you start matters.
What happens to my stipend if the hospital cancels me for low census?
It depends on your guaranteed-hours clause. If your contract guarantees the hours, you may be paid for the canceled shift and keep the stipend; if it does not, a low-census cancellation can cost you both the wages and that day's per diem. This is one of the most important clauses to confirm before signing.
Does taking PTO reduce my per diem?
Usually, yes. Per diem covers the cost of being away working, so days you are not on assignment — including unpaid time off and many PTO arrangements — are typically not stipend-eligible. Few travel contracts include traditional paid time off, and where they do, the stipend treatment is spelled out in the contract.
Why is my first week's stipend lower than the rest?
Often because of travel-day proration. The meals and incidentals portion is paid at 75% on the first and last days of travel under the GSA method, and you may also have started mid-week. The middle weeks, with full shifts and full days away, usually show the full stipend.
The bottom line
Per diem clawbacks feel unfair until you understand that proration is exactly what keeps your stipends tax-free. Budget for the weeks where census, illness, or travel days trim the stipend, confirm the proration and guaranteed-hours clauses before you sign, and keep your own shift log. For the bigger picture on which dollars are taxed, read what's taxable and what's not in a travel contract, and confirm your stipends rest on a solid foundation with the Tax Home Quiz.
This article is general information, not tax advice. Per diem proration and clawback terms are set by your agency contract and vary widely. Read your contract carefully and consult a travel-tax professional about your specific situation.