When a hospital signs a locum tenens contract, the bill rate is the number everyone sees. What most administrators don't see — and what agencies rarely volunteer to explain — is how that rate is constructed, what percentage flows to the clinician versus the agency, and where there's room to negotiate.
This matters because the difference between a well-structured locum staffing engagement and a poorly negotiated one can run to tens or hundreds of thousands of dollars per year, depending on volume. For health systems dealing with sustained staffing pressure, understanding the economics of agency markup isn't optional — it's table stakes for responsible contracting.
How Agency Markup Actually Works
The "markup" is the spread between what a staffing agency pays the clinician and what it charges the health system. In locum tenens, markup is typically expressed as a percentage of the clinician's compensation or as a flat dollar-per-hour premium.
At the surface level, the mechanics are straightforward:
- Bill rate: What the health system pays the agency (e.g., $250/hour)
- Pay rate: What the clinician receives (e.g., $175/hour)
- Gross margin: The difference ($75/hour, or 30% of the bill rate)
That 30% is in the typical range for locum tenens agencies, though markups can range from 20% to 45% or higher depending on specialty, geography, contract terms, and how the agency categorizes its cost components.
What makes locum markup materially different from permanent hire overhead is that it's compounding. A permanent employee's loaded cost — benefits, malpractice, payroll taxes — is a one-time structural decision. Agency markup is paid on every hour worked, for the duration of the engagement. At 40 hours per week for 13 weeks, a $75/hour markup translates to $39,000 per assignment in fees alone — before the clinician has billed a single CPT code.
What's Actually Inside the Markup
Agencies don't simply take margin as profit. The markup covers real operational costs, and understanding their breakdown helps health systems evaluate whether they're being charged fairly.
Typical components of locum agency gross margin:
| Cost Category | % of Markup (Approximate) |
|---|---|
| Malpractice insurance | 8–12% |
| Payroll taxes (FICA, FUTA, SUTA) | 6–9% |
| Workers' compensation | 1–3% |
| Benefits administration (if offered) | 2–5% |
| Credentialing and compliance | 3–6% |
| Recruiter commission | 10–18% |
| Technology and infrastructure | 3–5% |
| Agency net profit | 10–20% |
These ranges are approximations — every agency structures its cost accounting differently, and few will share their actual breakdown. But this framework helps explain why markups can't realistically compress below 20%: the underlying compliance and insurance obligations are real, and they're not negotiable with state regulators or malpractice carriers.
Where there is negotiation surface is in the recruiter commission layer, the technology fees, and the net profit margin. These vary widely by agency scale, operational efficiency, and how much volume you're bringing to the relationship.
The Variables Health Systems Consistently Underestimate
Understanding the headline markup percentage is the beginning. Several additional variables significantly affect total cost, and most surface in the contract's fine print rather than the rate sheet.
Housing and Travel Pass-Throughs
Many agencies structure locum contracts with housing and travel as either included in the bill rate or as pass-through costs billed separately. The distinction matters enormously.
If housing is pass-through, the health system bears the actual cost of wherever the clinician stays — which could mean $200/night hotel rates during a regional conference week, or last-minute flight premiums when scheduling changes. If it's blended into the bill rate, you have cost predictability, but you may be paying a higher rate than the underlying cost warrants for clinicians who live nearby and commute.
Ask specifically: What is the housing and travel arrangement, and what triggers additional billing?
Overtime and Call Premium Structures
Standard locum contracts define a base weekly hour commitment, but coverage needs rarely stay neat. When a clinician takes call, covers unplanned shifts, or runs into overtime, the premium structure in the contract — typically 1.5× to 2× the bill rate — kicks in at the agency's discretion.
Some agencies apply overtime multipliers to the bill rate, not just the pay rate, which means the health system absorbs both the clinician's overtime premium and the markup on top of it. A $250/hour bill rate becomes $375/hour for overtime hours, with the full markup retained.
This is a legitimate negotiation point. Request that overtime be billed at a blended rate that holds the agency's margin flat — you shouldn't be paying markup on the clinician's premium labor cost.
Extension Rates vs. Initial Placement Rates
Most locum contracts include a 13-week initial term with an extension clause. What many health systems miss is that extension rates are often negotiated separately — and agencies frequently quote initial rates at a competitive level specifically to get the contract signed, with the expectation of margin recovery on extensions.
Get the extension rate structure in writing before signing. Ideally, lock in a defined extension rate at the time of initial contracting, before the relationship is established and leverage shifts toward the agency.
Credentialing Responsibility and Delay Costs
Credentialing delays push a clinician's start date back while the health system continues to carry its coverage gap. Most agencies will continue billing for any orientation and credentialing time they consider "work," even if the clinician isn't yet seeing patients.
Credentialing bottlenecks are one of the most preventable sources of hidden locum cost, and yet contract language often leaves the financial risk of delays squarely on the health system. Negotiate clear credentialing milestones with defined financial consequences for agency delays.
Why the Markup Rate Is Only Half the Story
Health system procurement teams are conditioned to focus on bill rate — it's the most visible number and the easiest lever to push. But bill rate optimization alone can actually increase total spend if it drives agency behavior in the wrong direction.
Here's how: agencies facing margin pressure on bill rate tend to respond by matching you with providers who accept lower pay rates — which typically means less experienced clinicians, providers who struggled to place elsewhere, or those with thinner credentials. The cost of lower quality isn't captured in the bill rate; it shows up in patient throughput, adverse events, documentation burden on your permanent staff, and the kind of productivity losses that accumulate quietly across your ledger.
The more useful negotiation posture is total cost of engagement:
- What is the clinician's pay rate? (A proxy for quality and experience)
- What does the all-in weekly cost look like with housing, travel, and compliance?
- What is the expected productivity of this provider relative to your baseline?
- What is the mutual cost of credentialing delays, early termination, and schedule changes?
A slightly higher bill rate for a clinician who hits the ground running, maintains productivity targets, and doesn't generate downstream documentation problems is often cheaper than a discounted rate for someone who creates friction throughout the engagement.
Comparing Agency Models: What the Market Offers
Not all locum agencies operate on the same model, and the structural differences matter for how markup accumulates.
Traditional contingency agencies operate on full markup at scale. They maintain large recruiter staffs, invest in candidate pipelines, and charge accordingly. Their margin reflects volume overhead. For health systems with ongoing locum needs, the relationship model can justify this cost — but only if the agency consistently delivers.
Boutique specialty agencies often run narrower markups but restrict their focus to specific specialties or regions. For a rural critical access hospital filling hospitalist coverage, a specialist agency may outperform a generalist on both match quality and cost.
Technology-enabled platforms — a category that includes newer entrants like Rediworks — work to reduce recruiter commission layers by using AI-assisted matching, reducing the manual labor cost that drives markup. When the matching overhead shrinks, margin can compress without sacrificing provider quality or compliance infrastructure.
Direct contracting is worth evaluating for any health system that has identified reliable locum providers who return repeatedly. Once an agency relationship has established the credentialing and compliance infrastructure, some health systems renegotiate subsequent engagements directly with the clinician (where state law permits), cutting the agency entirely. The administrative complexity is real, but for high-volume users, the savings justify building the internal capability.
What a Fair Contract Looks Like
Health systems with leverage — high volume, consistent scheduling, or desirable locations — should expect to negotiate terms beyond the bill rate.
Reasonable asks in locum contract negotiation:
- Rate transparency: Request a breakdown of bill rate components, even in general terms. Agencies that refuse entirely are treating margin as a secret, which is a signal worth noting.
- Housing cost ceiling: Cap the health system's exposure for housing at a defined per-night rate, with agency responsibility for costs above the cap.
- Performance guarantees: Define minimum hours worked per engagement, with proration or credit if the clinician underperforms.
- Extension rate lock: Lock extension rates at the time of initial contracting, or define a formula (e.g., CPI adjustment plus fixed percentage) rather than leaving them open to renegotiation.
- Credentialing timeline SLAs: Define credentialing milestones with financial penalties for agency delays that push back start dates.
- Substitution rights: Negotiate the right to request a replacement clinician if a provider consistently underperforms, without restarting the contract term.
None of these are extraordinary asks. Agencies that can't accommodate reasonable transparency and performance terms likely aren't structured to deliver on them operationally, either.
The Strategic Calculus for High-Volume Users
For health systems running significant locum volume — multiple FTE equivalents across departments — the agency markup conversation eventually becomes a build-vs-buy question.
Building internal locum management capability: a dedicated coordinator, a credentialing specialist, access to job boards and CV databases, and a malpractice policy that covers per-diem providers. For a health system spending $2M+ annually on locum agency fees, the internal investment can pay for itself within 18 to 24 months.
The build path is genuinely complex — provider sourcing, credentialing infrastructure, payroll and tax compliance for 1099 and W-2 classification, and malpractice administration are all nontrivial. But for large health systems, the business case for bringing flexible staffing in-house deserves rigorous analysis alongside the agency model.
The right answer for most facilities is a hybrid: maintain agency relationships for specialty-specific or hard-to-fill needs where the sourcing expertise is genuinely valuable, while building internal capability for recurring coverage gaps in core specialties. The key is being deliberate about which category each vacancy falls into — and not defaulting to agency for every need simply because it's the path of least administrative resistance.
What to Ask Before You Sign
If you're reviewing a locum staffing contract in the next 90 days, these questions will surface the terms that most affect your total cost:
- What is the clinician's hourly pay rate, and how does it compare to market for this specialty and geography?
- How are housing and travel costs structured — included, capped, or fully passed through?
- What triggers overtime billing, and at what multiplier applied to what base?
- What is the extension rate, and can it be locked at initial contracting?
- What credentialing timeline commitments does the agency make, and what are the consequences for delays?
- What is the early termination structure for both parties?
- Does the contract contain exclusivity provisions that limit your ability to source the same provider through other channels in the future?
The locum tenens market is competitive, and well-run health systems have more leverage than many realize. The agencies that refuse reasonable transparency are counting on the assumption that their clients won't ask. Ask anyway.
Understanding what drives locum cost gives health systems the analytical foundation to make better decisions — not just on the current contract, but on the broader staffing strategy. The goal isn't to eliminate locum spend; it's to ensure that every dollar is working as hard as the clinicians it covers.