Temp Staffing vs. Mandatory Overtime: Which Costs Less?

It’s mid-October 2026. Your crew has been on mandatory overtime for three weeks, the forecast says 10 more weeks, and somebody upstairs wants to know whether bringing in temps would cost less.

Most people run the temp staffing vs. overtime math in one line. Overtime is $30 an hour and a temp bills at about the same, so call it a wash, keep the crew you know, and move on.

That math is wrong in both directions, because it leaves out half the cost of each option. Below is the full version, run on a model Utah warehouse with every assumption on the table.

The short answer: overtime is cheaper for a spike shorter than about three weeks. Past that, temps cost less per productive hour. For a typical 6- to 12-week Q4 peak, the cheapest plan in our model is a mix: a small temp buffer that holds your core crew near 45 hours a week.

The true cost of mandatory overtime

Mandatory overtime costs more than its 1.5x sticker price once you add payroll taxes, fatigue, and the people it drives out the door. Under the Fair Labor Standards Act, every hour past 40 in a week costs 1.5 times the regular rate, so a $20 picker costs $30 an hour on overtime. Four more costs stack on top of that.

1. Payroll load. Social Security and Medicare apply to every overtime dollar, a combined 7.65% according to the IRS. State unemployment insurance and workers' comp premiums are assessed on payroll too. Call it 10% all in, and that $30 hour costs you $33.

2. Fatigue. BLS studies reproduced in a government-hosted analysis put productivity at 92% for a 50-hour week and 82% for a 60-hour week. At 50 hours you pay $33 for about 55 minutes of output, which puts a real hour of output at about $35.87.

3. Quit risk. People don’t quit over one long week; they quit over the eighth one in a row. Replacing an hourly worker earning under $50,000 costs about 20% of annual salary, according to a Center for American Progress meta-analysis of 31 case studies. At $20 an hour, that comes to about $8,320 per person who walks. The research dates to 2012, so treat it as a floor.

4. Injury exposure. In a study of more than 110,000 job records, Dembe and colleagues found jobs with overtime carried a 61% higher injury hazard rate than jobs without. We left that out of the dollar math because we can’t price it honestly, but it still belongs on the list.

One more cost never shows up on a report. The people you lean on hardest during a peak are your best people, and your best people have the most options.

What a temp worker costs: bill rate plus ramp time

A bill rate is the hourly price a staffing agency charges you for a temp. It covers the worker's wage, payroll taxes, workers' comp, recruiting, screening, and the agency's margin. The worker sees the pay rate; you see the bill rate.

Our model bills a $20-an-hour temp at $30, a 1.5x multiplier. Treat that as an assumption and swap in your own quote. Because the $30 already includes payroll load, temps look cheaper on paper: $30 against $33. They carry their own costs, though, and most comparisons you’ll find online skip them.

Start with ramp time: someone on day three picks slower than someone in year three. Our model assumes 50% productivity in week one, 80% in week two, and 95% after that, and your numbers will move with how complex your pick paths are.

Training takes time away from your leads. We budget six hours per temp, which is six hours a lead spends walking a new worker through the floor instead of picking.

Temps quit too. We assume two of 10 leave mid-season, and each replacement starts the ramp over.

And new workers get hurt more often. Employees in their first year on the job account for 35% of workers' comp claims, according to the Travelers 2024 Injury Impact Report, which analyzed more than 1.2 million claims. Skip onboarding and you trade one injury risk for another.

Add it all up over a 10-week peak and a temp costs about $34.70 per productive hour. That beats the $35.87 overtime hour by about a dollar, so the length of the peak ends up deciding the question.

Temp staffing vs. overtime: a side-by-side cost comparison

The setup. A Utah distribution center with a core crew of 40 pickers. Base rate $20 an hour, close to the Utah median for material movers. Peak season needs 400 extra productive hours a week, the equivalent of 10 full-time people, for 10 weeks. Every input below is an assumption you can replace with your own.

Option A, all overtime. The 400 hours land on your core crew: 10 extra hours each, a 50-hour week, for 10 straight weeks. At 92% productivity you need about 435 paid hours a week to get 400 hours of work. We also assume one person quits for every five weeks of 50-hour schedules, which means two departures over the peak.

Option B, all temps. Ten temps at 40 hours a week, with ramp, training, and two mid-season replacements included. A little overtime covers whatever the temps cannot deliver while they ramp.

Option C, the hybrid. Six temps, plus your core crew at about 45 hours a week.

All three options deliver the same 4,000 productive hours. The hybrid costs about $24,700 less than running the peak on overtime, and it gives your crew back five hours every week.

Shorten the peak and the answer changes:

The break-even sits right around week three; before that, the temp never gets past the learning curve. After it, overtime's fatigue and quit risk keep compounding while the temp keeps getting faster.

Want to run your own numbers? Download the Staffing ROI Calculator and plug in your rates.

When is overtime cheaper than temp staffing?

Overtime is cheaper when the spike is short, the extra hours per person are small, or the work takes weeks to learn. Temps are cheaper when the gap runs a month or longer and a new person can learn the job in a few days.

The onboarding row decides more plans than the math does. A new worker who gets a vest and a vague wave toward the pick line struggles for a week and then stops showing up, and somebody upstairs concludes that staffing doesn’t work. What actually failed was the first Tuesday, when nobody was assigned to show them the job.

How to cap overtime with a small temp buffer

The best Q4 plans use both tools on purpose: pick an overtime ceiling your crew can live with, then size a temp buffer to cover everything above it. We used 45 hours a week in the model. Your crew may tell you 44 or 48.

Step 1: Set the cap. Decide the most overtime you will ask of your core crew, and write it down before the peak starts.

Step 2: Size the buffer. Take your weekly gap, subtract what the crew covers at the cap, and divide by about 36 productive hours per temp. In our example, six temps does it.

Step 3: Put your people on the hard work. Let your experienced pickers handle complex orders, problem-solving, and training. Put the temps on tasks a new person can learn in a day.

Step 4: Flex overtime and hold the buffer steady. When volume runs hot, add a few overtime hours. When it runs light, cut them. The temps stay put and keep getting faster.

Step 5: Watch for keepers. By December you will know who your best temps are, and through temp-to-hire a temp who proved themselves in Q4 can become next year's lead.

The hybrid also holds up better when something goes wrong. If two temps leave, overtime covers the gap for a week while replacements ramp. If two veterans leave in the all-overtime plan, nobody is left to cover it.

What the all-overtime plan costs you by January

Run the all-overtime plan through December, and here is the likely bill: about $24,700 more than the hybrid, two veterans gone, and a crew that has worked 10 straight 50-hour weeks. The two who leave will probably wait until January, right when you’re trying to rebuild, and you’ll start next year's peak two veterans short.

What a well-staffed December looks like

Picture the second week of December. The order board is heavy, the floor is calm, and your pickers are on a 45-hour week that nobody’s complaining about. Six temps are working at full speed on the tasks they learned in October. Your best lead is training a new hire instead of covering a third straight Saturday.

In January, that lead is still on your payroll, along with two or three temps you decided to keep.

Frequently Asked Questions

Is it cheaper to pay overtime or hire temporary workers?

It depends on how long you need the extra hours. For a gap under about three weeks, overtime is usually cheaper, because a new temp spends most of that time getting up to speed. Past three weeks, temps usually cost less per productive hour, because overtime productivity falls to about 92% at a 50-hour week and the risk of losing experienced workers keeps growing. In a 10-week warehouse model, temps cost about $34.70 per productive hour against $35.87 for overtime.

How much does a temp worker cost per hour?

You pay the staffing agency a bill rate, which is the worker's pay rate times a multiplier. The multiplier covers payroll taxes, workers' comp, recruiting, screening, and the agency's margin. A 1.5x multiplier, for example, means a temp earning $20 an hour bills at $30. Multipliers vary by role, location, and agency, so ask for a written quote and compare it against your loaded overtime rate.

What is the true cost of overtime?

The true cost of overtime is the 1.5x wage plus payroll taxes, lost productivity, and turnover risk. Employer Social Security and Medicare taxes add 7.65% to every overtime dollar, and unemployment insurance and workers' comp add more on top. BLS studies show productivity falls to about 92% at a 50-hour week and 82% at a 60-hour week. A $20 worker on overtime can cost close to $36 per productive hour before counting quits or injuries.

How many hours of overtime is too much?

Federal law sets no weekly cap on overtime for adults, and Utah does not add one, but the research points to a clear pattern. Productivity drops measurably once weekly hours reach about 50, and a large study in Occupational and Environmental Medicine found jobs with overtime had a 61% higher injury hazard rate than jobs without. A cap somewhere in the mid-40s keeps a crew below the range where those losses show up.

Does mandatory overtime increase turnover?

Long stretches of mandatory overtime raise the odds that experienced hourly workers leave, and each departure is expensive. Replacing an hourly worker earning under $50,000 costs about 20% of annual salary, according to a Center for American Progress meta-analysis. At $20 an hour, that is about $8,320 per departure. Capping overtime with a small temp buffer is one of the most direct ways to reduce that risk.

How long does it take a temp worker to become productive?

It depends on the task and the onboarding. For simple warehouse work like picking and packing, a temp with structured onboarding and a named person to ask can get close to full speed within a couple of weeks. Our cost model assumes 50% in week one and 80% in week two. Complex roles with specialized equipment or detailed quality checks take longer. Without onboarding, ramp time stretches and temp turnover rises, which erases most of the savings.

Can you use overtime and temporary workers at the same time?

Yes, and for most seasonal peaks that is the lowest-cost approach. Set an overtime cap for your core crew, such as 45 hours a week, and use temps to cover the hours above it. In a 10-week warehouse model, six temps plus capped overtime cost about $135,400, compared with about $160,100 for overtime alone.

Ready to see your own numbers?

Tell us your gap, your rates, and how long the peak runs. We’ll tell you whether temps, overtime, or a mix makes sense, even if the answer is "keep the overtime." We fill about 250 positions a week across the Salt Lake Valley, Utah County, and Davis and Weber counties.