Your Biggest Account May Be Earning You the Least
Most staffing owners can tell you last week's total gross margin to the decimal and can't tell you which accounts earned it. That's the problem in one sentence. The blended number feels like control, and it's the one number that guarantees you can't see where the money is actually made or lost.
The spread is not small. Staffing Industry Analysts puts aggregate temporary-staffing gross margin around 21 percent, but the range across firms runs from roughly 14 percent to over 40, and the range across placements inside a single firm is often wider still. Markups on temp and contract work commonly land anywhere from 30 to 75 percent. Direct-hire fees run 15 to 30 percent of first-year salary and cost you almost no working capital to earn. IT contract work was carrying gross margins near 28 percent in 2025 on bill rates above $80 an hour. Light-industrial markups sit lower, often 40 to 55 percent gross of a much smaller bill rate, and they come loaded with workers' comp burden that eats into the spread before you see a dollar of it. Healthcare markups can reach 100 percent or more, dragged back down by licensing verification and comp costs. Inside one firm, in a single week, the margin per placement can swing by a factor of three or four. The blended 21 percent is the average of things that have almost nothing in common.
The average is hiding two different questions
There are really two numbers an owner needs, and gross margin percentage answers neither on its own.
The first is margin per placement, fully burdened. Not the pay-to-bill spread on the quote sheet, but what's left after the statutory load that actually rides on that specific worker in that specific role and state. Workers' comp on a warehouse body is a different animal than comp on a bookkeeper. Unemployment insurance, the employer share of payroll tax, any benefits you carry, plus your cost to recruit and replace that seat, all of it lands differently by segment. A 55 percent markup on light industrial can end up thinner, after burden, than a 35 percent markup on clerical. If you're pricing off markup and managing off blended margin, you're flying on two instruments that both lie to you.
The second number is the one almost nobody runs. Return on the working capital the account consumes. That's where staffing is different from a normal services business, and it's the number that turns your ranking upside down.
The heaviest accounts often earn the least on the cash they tie up
Picture 2 clients. One is a light-industrial account, 60 people out every week, big billings, thin burdened margin, and it pays on net 60. The other is a specialty account, 6 placements, fat margin, pays on net 30. Ranked by revenue, the first one is your crown jewel and the whole office treats it that way. Ranked by dollars of margin earned per dollar of payroll cash tied up, it may be the worst account on your books, and the small one may be the best business you do.
The mechanism is simple once you see it. Every account ties up cash equal to its weekly payroll times the number of weeks until it pays. The big, slow-paying, thin-margin account ties up an enormous pile of your money and returns a small margin on it. The small, fast-paying, fat-margin account ties up almost nothing and returns a lot. You've been financing your least efficient business with the profits of your most efficient one, and the revenue ranking on the wall told you to do exactly that.
This is why a growing agency can hit a wall it doesn't understand. Demand is fine. The account is empty, because the firm has been pouring working capital into the accounts that give the least of it back, and calling that a strategy because those accounts are large.
Run the ranking that revenue hides
You don't need a new system for this. You need one honest pass through the book you already have.
Take your top ten or 15 accounts. For each, get the burdened gross margin in dollars, not percent, after the statutory load and workers' comp that genuinely applies to those roles. Then estimate the working capital each one consumes: weekly payroll times weeks-to-pay based on how that client actually pays, not how the contract reads. Divide margin dollars by capital tied up. Sort the list by that ratio.
The order will not match your revenue ranking, and the gap between the two lists is your whole opportunity. Some accounts earn their place and you'll fund them harder. Some are quietly renting your balance sheet at a loss, and the fix is a repriced markup, a shorter term, a deposit, or a polite goodbye. A few small accounts you've been ignoring are the highest-return business in the building and deserve to be grown.
Do that once and you'll never look at a blended margin the same way again. It was never one number. It was a crowd of very different numbers standing where you couldn't tell them apart.