Labor cost is not the number at the bottom of the timesheets. That number is wages, and wages are somewhere between three quarters and seven eighths of what your staff actually cost you.
The gap matters because every benchmark you will ever be compared against is quoted fully loaded. Measure yourself on wages alone and you will look fine at 27% while the shop next door, counting properly, is worried at 31% — and they are the one with the healthier business.
What actually counts
Wages. Hourly, salary, overtime premium. The easy part.
Employer payroll taxes. The half you pay on top of what the employee pays. Social Security and Medicare come to 7.65% of wages, and that rate is fixed and predictable. Federal and state unemployment sit on top of it and vary enormously — state unemployment is experience-rated, so a business that has never had a claim pays a fraction of what one with layoffs behind it does.
Workers' compensation. Priced per classification code, and the spread is wide. A nail technician and a line cook are not the same risk, and neither is the same as your bookkeeper.
Benefits. Health contributions, retirement matching, anything you fund per head.
Paid time off. Hours you pay for and get no revenue from. Easy to forget precisely because nobody was on the floor to remind you.
Add those up and fully loaded labor typically runs 15–25% above wages. If your timesheets say $18,000 for the month, your real labor cost is somewhere around $21,000 to $22,500. That is the number to divide by sales.
The two mistakes that make it useless
The first is the one above: wage-only on top. It flatters every result by a quarter, which is exactly the size of the problem you were trying to detect.
The second is subtler and catches more people. The bottom of the fraction has to be the same sales figure your profit and loss uses — net of comps, discounts and refunds, not the gross ring. A shop running heavy promotions can improve its labor percentage on paper by counting the discounted revenue at full price, which is a way of hiding a labor problem inside a marketing one.
Pick one definition of each half, write it down, and never quietly change it. A labor cost percentage is only useful as a series. One month's figure tells you almost nothing; twelve consistent months tell you everything.
Salons are a different question
Everything above assumes you employ people at a wage. Plenty of salons do not.
Under commission, labor cost moves with revenue by design — a 45% split is 45% of services whether the week was busy or dead, and the interesting question is not the percentage but what the house share buys. Under booth rent it inverts: labor is not a cost at all, it is income, and the risk sits with the technician.
That is a genuinely different piece of arithmetic, and we wrote it up separately in nail tech commission structures — including the crossover formula that tells you when a technician is better off renting.
Where to put the number once you have it
Labor on its own is half a picture. Restaurants generally watch prime cost — labor plus cost of goods — because the two trade against each other: a kitchen that preps everything in house spends less on food and more on hours, and one buying prepared components does the reverse. Judging either alone rewards moving cost sideways.
If you want the arithmetic done for you, the restaurant labor cost calculator works it out fully loaded against the 25–35% band, and separates out how much of the total is staff time on the phone — which is the only labor you can remove without removing a person.