Staffing margins: separate bill rates and employer burden
A staffing company’s bill rate minus a worker’s wage is not its profit per hour. Payroll taxes, benefits, insurance, paid leave and assignment-related costs can consume part of the spread. Reconstruct the employer burden and the paid-versus-billed hours before interpreting a higher bill rate as better economics.
Use the correct service model
Robert Half’s annual report discusses contract talent activity through hours worked and bill rates, alongside its other service businesses. Contract staffing, permanent placement and consulting do not share one hourly revenue model. A permanent-placement fee should not be divided by temporary-worker hours to produce an apparent rate increase.
Identify who employs the worker and which costs the staffing company bears. A disclosed wage figure may exclude employer contributions; a gross bill rate may include pass-through reimbursements. The aim is an assignment-level contribution estimate with a documented boundary, not an assertion that published company gross margin follows one standardized formula.
A hypothetical hourly calculation
Assume a fictional staffing provider bills 60 per productive hour and pays a base wage of 40. Employer taxes and benefits cost 8 per paid hour. An additional 2 of assignment support and insurance cost is allocated per billed hour. With one paid hour per billed hour, contribution is 60 − 40 − 8 − 2 = 10.
| Hypothetical one-hour economics | Amount |
|---|---|
| Bill rate | 60 |
| Base wage | −40 |
| Employer taxes and benefits | −8 |
| Assignment support and insurance | −2 |
| Contribution before branch overhead | 10 |
The apparent wage spread is 20, but contribution is 10 before branch overhead. It is neither net income nor free cash flow. Keep recruiting staff, office costs and corporate expenses visible when connecting this calculation to reported operating profit.
Now assume the bill rate increases to 63 while wages rise to 43 and burden becomes 8.60. With other support unchanged, contribution falls to 9.40. Revenue per hour grows 5%, yet contribution per hour falls 6%. Higher professional salaries can lift nominal bill rates without improving the provider’s retained spread.
Paid hours need not equal billed hours
Suppose workers receive paid leave or guaranteed pay, producing 1.05 paid hours for each billed hour. Apply wage and paid-hour burden to 1.05, not to one. Using the initial assumptions, contribution becomes 60 − 1.05 × 48 − 2 = 7.60 per billed hour.
The point is not that every staffing contract has this pattern. It is that the numerator and cost denominator must reflect the actual employment terms. Public disclosures may not provide this detail. Show the consequence as a scenario and avoid presenting an assumed burden percentage as a known company fact.
Test the assignment portfolio
Separate occupation, geography, assignment duration, client pricing and worker tenure. A shift toward expensive specialists can raise average bill and pay rates together. Holiday calendars and changes in paid leave can also distort quarterly comparisons, while shorter assignments can increase recruiting costs per billed hour.
Review when bill-rate growth accompanies falling hours, when wage increases outpace client repricing, or when workers remain paid between assignments. The first condition tests demand and mix; the second tests pricing lag; the third tests utilization and employment obligations. They require different evidence rather than a generic margin explanation.
The final worksheet should reconcile billed hours, productive hours, paid hours, bill rate, wage, employer burden and residual overhead. It evaluates staffing service economics, not the attractiveness of employing a particular occupation or a forecast of equity returns.
Receivable timing adds another distinction to hourly contribution. Workers may need to be paid weekly while clients settle invoices later. Growing billed hours can therefore increase financing needs even when each assignment remains profitable. Record payment terms and actual collection evidence separately from the bill-pay calculation. The additional working-capital requirement should not be mistaken for a deterioration in hourly economics, but it still matters when assessing whether the staffing company can fund expansion.
FAQ
Is the bill-pay spread the staffing company’s gross margin?
Not automatically. Employer costs and the company’s presentation can differ. Reconcile the actual cost classifications before applying that label.
Does a higher average bill rate prove stronger pricing power?
No. Occupation mix and wage inflation can raise average rates. Test compatible assignments and the contribution retained after employer obligations.