PRN and Per Diem Staffing: Agency Markups vs. Internal Float Pools

Last updated August 20, 2026 · Part of our healthcare recruiting guide

PRN and per diem staffing agencies typically charge a 50% to 75% markup on the clinician's hourly wage to fill immediate shift vacancies. For a per diem RN earning $45/hour, the agency bills the facility $67.50 to $78.75 per hour. If a facility relies on an agency to fill just 20 vacant shifts a month, that markup premium costs $5,400 to $8,100 above base wages. Building an internal PRN float pool through direct recruiting eliminates this markup entirely.

See what it costs to recruit PRN staff directly →

A note on who's writing this

When facility schedulers and Directors of Nursing search for PRN staffing costs, they usually find articles written by per diem agencies and shift-booking apps. Because their revenue relies on capturing a percentage of every hour worked, their content frames high markups as the unavoidable price of flexible shift coverage.

Boostpoint is not a staffing agency. We build recruitment advertising software that helps healthcare systems, senior living facilities, and behavioral health centers build their own internal float pools by recruiting PRN clinicians directly through targeted social media campaigns.

We know that per diem agencies are sometimes necessary — a 4:00 AM call-out often requires an immediate agency fix. But we can provide the financial perspective agency guides leave out: what it actually costs to proactively build an internal PRN bench, using real 2026 campaign data across the healthcare sector.

What PRN and per diem staffing actually costs

PRN (Pro Re Nata, or "as needed") and per diem staffing agencies provide clinicians on short notice to cover sick days, census spikes, and weekend gaps. Because agencies must maintain a deep, idle bench of credentialed workers, their hourly markups are generally higher than standard travel or local contract rates.

Published fee structures for PRN and per diem staffing:

These markups apply to every hour a per diem agency worker is on your floor. For behavioral health staffing and therapy staffing, where specialized credentialing is strictly enforced, markups consistently skew toward the higher end of the spectrum. For the wider picture across permanent and travel hiring too, see our healthcare staffing costs breakdown.

What that markup means per shift

Unlike permanent hiring, PRN staffing costs are measured by the shift. Consider a standard 12-hour shift:

For every 12-hour per diem RN shift you book through an agency, you pay $324 that goes strictly toward agency overhead and profit, rather than patient care or clinician compensation. Per diem markup is one of five fee structures — we compare all of them in healthcare staffing costs by arrangement.

The arithmetic of relying on agency coverage

Facility schedulers are evaluated on keeping units safely staffed, not just annual headcount. The financial drain of PRN agencies becomes clear when you look at monthly shift volume.

If a mid-sized facility uses an agency to cover just 30 shifts a month (roughly one call-out or gap per day):

Paying $116,000 a year in pure markup to cover a predictable volume of unpredictable absences is an inefficient use of budget. The alternative is building an internal PRN float pool — hiring clinicians directly who agree to pick up a minimum number of shifts per month.

What it costs to recruit PRN staff directly

Is it possible to recruit PRN staff directly? Yes. Many clinicians actively seek PRN roles to supplement their primary income, manage family schedules, or maintain clinical skills without full-time commitments.

Traditional job boards perform poorly for PRN recruiting because passive clinicians aren't actively searching Indeed for an extra weekend shift. Targeted social media advertising on Facebook and Instagram reaches these professionals where they already spend their time — the wider pattern across every role we track is in our published 2026 campaign data.

Across Boostpoint-managed campaigns targeting PRN and part-time healthcare roles in 2026:

Data based on Boostpoint internal benchmark studies covering healthcare recruitment campaigns. CPA reflects direct ad spend and platform management.

Calculating the ROI of an internal float pool

A 1-in-10 applicant-to-hire rate is a strong outcome, not a safe planning number. Fewer than half your RN applicants may be immediately available, credentialed, and a scheduling fit — so it's worth pricing the acquisition cost across a range of conversion rates, not just the best case.

Compare that to the agency route:

• Agency route: You pay a $324 markup premium every single time that nurse works a 12-hour shift, with no ceiling on how many shifts you'll book.
• Direct route: You pay a one-time acquisition cost — $185.50 to $1,855.00 depending on your conversion rate. Once they are in your float pool, you pay only their wages and internal payroll taxes for every shift they pick up.

Even at a conservative 1-in-100 conversion rate, direct recruiting still pays for itself in under six 12-hour shifts. At a strong 1-in-10 rate, it pays for itself before that first shift ends. Which end of that range you land on depends on your screening funnel and how quickly you follow up with applicants — which is why it's worth running this calculation against your own numbers rather than the industry best case.

When a PRN staffing agency is the right call

Internal float pools cannot absorb every scheduling shock. Per diem agencies provide a critical safety net for facility schedulers.

Use a PRN staffing agency when:

• Last-minute call-outs threaten ratios. If a night-shift nurse calls in sick at 4:00 PM and your internal float pool is exhausted, an agency app is the only way to maintain safe patient ratios.
• Extreme seasonal census spikes. During severe flu or RSV seasons, when patient volume exceeds your facility's maximum built-in capacity, agencies provide vital overflow labor.
• Hyper-specialized coverage. If your lone Speech-Language Pathologist calls out, finding a PRN replacement locally may be impossible without an agency's regional network.
• Staffing up a brand new unit. When expanding, using agency per diem staff can safely buffer the schedule while your permanent and PRN direct-hire pipelines mature.

When building an internal float pool makes more sense

Recruit your own PRN staff directly when:

• Covering weekend and holiday gaps. Weekend shifts are notoriously difficult to fill. A dedicated internal PRN pool hired specifically for weekend differentials is vastly cheaper than weekend agency rates.
• Managing predictable absences. Maternity leaves, scheduled PTO, and continuing education days are known weeks in advance. These should never incur emergency agency markups.
• Improving continuity of care. Agency workers rotate frequently. Internal PRN staff know your facility's EMR system, your charge nurses, and your resident population, vastly reducing medication errors and orientation time.
• Behavioral health and memory care. In behavioral health staffing, patient familiarity and routine are critical. Rotating unfamiliar per diem agency staff can trigger patient distress; internal PRN staff provide necessary consistency.

The honest summary

If your facility experiences a true scheduling emergency, paying a 60% agency markup is the necessary cost of clinical safety. But if you rely on per diem agencies to cover standard weekend gaps or scheduled PTO because you don't have an internal bench, you are paying emergency prices for predictable events.

Top healthcare operators proactively recruit 15% to 25% of their total workforce as internal PRN float staff. By investing in direct recruitment advertising to keep this bench full, they reduce agency reliance to true emergencies only.

The calculation worth running this quarter

Schedulers and Nursing Directors should review these three metrics together:

1. Quantify your predictable gaps. Look at the last 90 days of agency usage. How many of those shifts were emergency call-outs versus scheduled PTO, maternity leaves, or known weekend holes?
2. Calculate the preventable markup tax. Multiply those predictable agency shifts by your average shift markup (e.g., 40 shifts × $300 markup = $12,000/month).
3. Price out an internal float pool. Compare that preventable monthly tax against the cost of running an "always-on" social media recruitment campaign targeting local PRN clinicians (typically generating PRN RNs for under $19 per applicant).

Frequently asked questions

Boostpoint figures are derived from managed healthcare and behavioral health recruitment campaigns conducted in 2025–2026, targeting part-time, PRN, and per diem roles. Cost-per-applicant metrics include direct ad spend and platform management fees. Agency markups and shift cost premiums are calculated using publicly available per diem rate schedules and industry benchmarking data.