Financial research concept

Professional Staffing Pay-Bill Spread

measures the difference between the amount billed to a client and the wage paid to the contract worker before payroll taxes, benefits, and other direct costs.

By Lee BaileyPublished Sep 28, 2026

Research context

See what supports this page, how current it is, and where comparable or historical context is available.

Research date: Sep 28, 2026Use the dated article and cited sources for the definition, examples, and stated limitations.
Operating-model context: 10 connected conceptsPart of the reviewed Professional Staffing & Talent Solutions Economics; issuer definitions remain distinct where disclosed.
Company examples: 2 reviewed companiesRelationships reflect supported examples, not a normalized cross-company KPI ranking.

Spread is not the same as gross margin
Rate increases only help when pay does not outrun them
Part of the Professional Staffing & Talent Solutions Economics
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The professional staffing pay-bill spread is the difference between the hourly amount billed to a client and the wage paid to the contract worker.

Robert Half defines pay-bill spread as the differential between wages paid to engagement professionals and amounts billed to customers. Kforce identifies changes in bill and pay spreads as a key driver of Flex gross profit margin.

Spread is not the same as gross margin

The spread is measured before several other direct costs. Payroll taxes, healthcare, other benefits, workers' compensation, and billable expenses can reduce the contract gross margin ultimately retained.

A wider spread can therefore coexist with flat gross margin if fringe costs rise.

Rate increases only help when pay does not outrun them

An increase in average bill rate is economically valuable when the provider does not need to raise worker pay by the same or greater amount.

Kforce's Technology Flex gross margin increased 120 basis points year over year in the second quarter of 2026, which it attributed primarily to improved bill and pay spreads. That is a cleaner pricing read than bill rate alone.

Primary sources: Robert Half 2025 Form 10-K and Kforce second-quarter 2026 Form 10-Q.

Part of the Professional Staffing & Talent Solutions Economics

Connect contract staffing volume, billing rates, calendar normalization, worker-pay spreads, gross margin, and permanent-placement count and fee economics.

Browse the full operating model in Company Analysis →

Where this concept fits

Contract staffing spread and gross marginCurrent relationship
The pay-bill spread captures the gap between customer billing and worker pay, while contract gross margin incorporates payroll taxes, benefits, reimbursable expenses, conversion revenue, and other direct-cost effects around that spread.
Staffing Contract Gross MarginStaffing Pay-Bill SpreadCurrent concept
Contract staffing volume, rate, and calendar
Billable hours measure delivered labor volume, average bill rate captures pricing and assignment mix, billing-day adjustment normalizes the calendar, and the volume-rate bridge explains how those pieces combine into contract revenue growth.
Staffing Average Bill Rate Staffing Billable Hours Staffing Billing-Day Adjustment Staffing Volume-Rate Bridge
Permanent placement and contract-to-hire economics
Permanent-placement revenue is driven by successful placement count and average fee, while conversion revenue captures a separate contract-to-hire path that can contribute high-margin fee revenue without adding contract hours.
Average Placement Fee Staffing Conversion Revenue Permanent Placement Count Permanent Placement Revenue

See It in Company Research

These companies are examples of how the concept is reported or discussed in public filings. Definitions can differ by issuer; these links open company research rather than a normalized metric comparison.

KFRCOpen operating-model research →10 of 10 reviewed concepts in Professional Staffing & Talent Solutions EconomicsContract staffing spread and gross margin2 of 2 bridge concepts supportedContinue through this bridge:Staffing Contract Gross Margin
RHIOpen operating-model research →10 of 10 reviewed concepts in Professional Staffing & Talent Solutions EconomicsContract staffing spread and gross margin2 of 2 bridge concepts supportedContinue through this bridge:Staffing Contract Gross Margin

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Compare staffing spreads

Compare customer bill rates against worker pay rates while keeping payroll taxes, benefits, and other direct costs outside the spread.

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