The appeal of per diem work is control of the calendar. The reality is a negotiation between two parties who both want flexibility, and the terms of that negotiation are the scheduling rules.
How shifts reach you
Facilities and agencies use some combination of four routes: a self-scheduling window in which per diem nurses claim shifts before the schedule is published, an open-shift board or app where uncovered shifts appear as they arise, a text or call from a scheduler on the day, and block booking, where a nurse commits to a run of shifts in advance.
Which route dominates decides what the job actually feels like. A unit that fills per diem shifts in a scheduling window weeks ahead offers predictability the nurse can plan around. A unit that calls at six in the morning offers the highest rates and the least usable calendar.
Minimum commitments
Most employers require something in exchange for keeping a nurse on the roster: a minimum number of shifts a month, availability on a set number of weekends, and a share of the winter holidays. Requirements to remain competent on the unit, such as a minimum number of shifts a quarter, are also common.
The requirements are worth reading closely, because they are where flexibility quietly disappears. A commitment of four shifts a month with two weekend days among them is not the same offer as four shifts a month, and holiday requirements are usually stated in a policy rather than in the offer.
Failing the minimum typically means removal from the roster rather than a penalty, which matters most to nurses using per diem work as a supplement to a full-time post elsewhere.
Cancellation and low census
This is the central risk of the arrangement and the one nurses underestimate.
When the census drops, the facility sends people home, and per diem staff are almost always first. Whether that comes with any notice, whether there is any minimum payment, and whether a cancelled shift can be reclaimed later are all matters of local policy.
Three things are worth establishing before joining a roster: how far in advance a cancellation is made, whether being sent home part-way through a shift carries any guaranteed minimum, and whether the nurse can be placed on call instead of cancelled and at what rate.
A nurse relying on per diem income should plan around the census, not around the schedule. How facilities decide that a shift is overstaffed is set out in patient acuity and staffing systems.
On call, and when it counts as work
Being on call is not automatically unpaid, and it is not automatically paid either. Under federal wage law, time spent waiting is working time when the employee is engaged to wait, meaning the restrictions are tight enough that the time cannot effectively be used for their own purposes. Time is not working time when the nurse is simply required to be reachable and is otherwise free.
Where a facility's arrangement falls on that line depends on the facts: how quickly the nurse must arrive, how far they may travel, how often calls come, and whether they may decline. It is worth asking what the call obligation actually requires before agreeing to carry the phone, because the answer changes both the pay and the value of the day.
Floating
Per diem nurses float more than staff nurses do, because they are hired precisely to go where the gap is. Some rosters are unit-specific; many are facility-wide.
Floating is where competence and availability separate. Being scheduled somewhere is not the same as being competent to take that assignment, and the obligation to decline an assignment you are not competent for sits with the nurse regardless of who is short. See scope of practice.
Practical questions: which units the roster covers, what orientation is provided to each, whether the nurse can be assigned as charge, and whether refusal of a float assignment counts against the commitment.
Orientation and competency
A per diem nurse still needs the facility's orientation, its record system, its policies and its annual competencies, and time spent on those may or may not be paid. Where employers differ sharply is in how much orientation a per diem nurse gets before being counted in the numbers.
For nurses on multiple rosters, the administrative load compounds: separate annual competencies, separate health requirements, separate logins, at every employer.
Reliability is the whole currency
The economics of a per diem roster run on the scheduler's confidence. A nurse who accepts shifts and turns up gets called first and gets the pick of the calendar. A nurse who cancels twice stops being called, without anyone announcing it.
This is the part that makes per diem work sustainable or not. The flexibility is real, and it is spent by declining shifts before accepting them rather than by cancelling after.
What employers should publish
The employers who fill per diem shifts most reliably are specific in writing about the things above: how far ahead shifts post, what the cancellation notice is, whether call pay exists, which units are in scope, and what the minimum commitment actually requires including weekends and holidays. Ambiguity on those points is read, correctly, as risk. See building a per diem roster.
Related
- Per diem nursing
- Per diem nurse pay
- Float pools and internal resource pools
- Building a per diem roster
- Scope of practice
Sources
- Per Diem Nursing 101: A Beginner's Guide to Getting Started. NurseRecruiter, 9 July 2024, on how shifts reach a per diem nurse and what flexibility requires. Accessed September 9, 2026.
- What is Per Diem Nursing? NurseRecruiter, 13 February 2024, on unpredictability as the central drawback. Accessed September 9, 2026.
- How to find per diem nurses to hire. NurseRecruiter, 26 January 2025, on self-scheduling and in-house pools from the employer's side. Accessed September 9, 2026.
- Fact Sheet #22: Hours worked under the Fair Labor Standards Act. U.S. Department of Labor, on waiting time, on-call time and what counts as hours worked. Accessed September 9, 2026.
- Overtime pay. U.S. Department of Labor, on the regular rate. Accessed September 9, 2026.