What It Really Costs to Replace an Employee

A bookkeeper who earns $55,000 a year hands you her two weeks' notice on a Monday morning. By the time you've replaced her, that one resignation will cost your business somewhere between $18,000 and $110,000. Most owners never see that number, because it never arrives as a single bill.

That's the trouble with replacement cost. It leaks out of your business in a dozen small ways over three or four months, and by the time the new person is finally up to speed, you've spent far more than you planned.

In 25 years of training business owners to hire, I've watched this play out hundreds of times. The owner budgets for a job ad and a few hours of interviews. The real cost runs five, ten, sometimes twenty times that. Here's the full math, line by line, so you can see exactly where the money goes.

What the Research Actually Says

Gallup puts the cost of replacing one employee at one-half to two times that person's annual salary, in its research on voluntary turnover. For a $55,000 bookkeeper, that's $27,500 on the low end and $110,000 on the high end.

The range is wide because it depends on the role, how long the seat stays empty, and how long the new hire takes to become productive. Gallup also estimates that voluntary turnover costs U.S. businesses about a trillion dollars a year, and that 52% of employees who quit say their employer could have done something to keep them.

If Gallup's range feels high for your shop, use a more conservative anchor. The Work Institute's 2024 Retention Report estimates a floor of roughly one-third of the departing employee's salary. For your $55,000 bookkeeper, that conservative floor is still about $18,000. Whichever number you use, it dwarfs the price of a job ad.

The Four Places the Money Goes

Replacement cost hides in four buckets. Add them up and the research range stops looking exaggerated.

1. The separation

The costs start before the new person is even posted. There's the unused PTO you pay out. There's the institutional knowledge that walks out the door: the passwords, the client quirks, the workarounds nobody wrote down. And there's the time you or a manager spend covering the gap and trying to document what the departing person knew.

2. The empty seat

This is the bucket owners forget. While the chair is empty, the work doesn't stop. It gets dumped on the people who stayed, or it doesn't get done at all. The average open role in the U.S. takes about 44 days to fill, according to SHRM's benchmarking. That's six weeks of slower service, missed deadlines, and a team carrying extra weight. If that bookkeeper was the only person who ran payroll, those six weeks have a very real price.

3. Finding and hiring the replacement

Now the visible costs. Job ads, the hours you spend screening resumes, phone screens, interviews, the second interview, reference checks, maybe a background check or an assessment. SHRM has pegged the average cost-per-hire at around $4,100 in its Human Capital Benchmarking Report, and that figure has only climbed since. For a small business owner, the biggest line item here is usually your own time, which you almost never count.

4. Ramp-up

The new person starts on day one earning a full salary and producing a fraction of full output. For a straightforward role, that ramp might be 30 to 60 days. For a complex one, it can run six months. The whole time, you're paying full price for partial work, plus the hours your existing staff spend training instead of doing their own jobs.

The Math on a $55,000 Role

Here's a conservative, real-world build for that bookkeeper. I'm deliberately using numbers on the low end.

Separation and lost knowledge: about $2,000. PTO payout plus your time documenting and covering the gap.

Empty seat, six weeks: about $6,300. Six weeks of a $55,000 salary's worth of work that didn't get done.

Recruiting and hiring: about $4,100. Ads, screening, interviews, checks, and your hours.

Onboarding and ramp, 45 days at half productivity: about $3,400. Full salary, partial output, plus your team's training time.

That lands near $16,000 to $18,000, right around the conservative one-third floor. Push any assumption toward reality, a longer vacancy, a harder ramp, a second resignation triggered by the overload, and you climb fast into Gallup's $27,000-and-up range. And none of that counts the soft hits: a stressed team, a few customer complaints, one good employee who starts eyeing the door because they're covering two jobs.

Why Your Number Is Usually Higher Than the Average

The build above is the polite version. In a real small business, four things tend to push the cost well past the average, and owners rarely account for any of them.

One resignation invites the next

People leave in clusters. When a teammate walks out and the work lands on whoever stayed, the people carrying that extra load start asking themselves the same question the leaver already answered. Gallup's finding that 52% of departures were preventable, from its turnover research, is really a warning about momentum. The conditions that pushed one person out are still there for everyone else. Lose your bookkeeper, overload your office manager to cover, and you can lose the office manager too. Now you're running the replacement math twice in one quarter.

The customer math is bigger than the payroll math

For any role that touches customers, the expensive part is the relationship, not the salary. A missed callback, a late delivery, a billing error during the scramble, any one of those can cost you a client who would have stayed for years. One lost account can outweigh the entire replacement cost on its own, and it never shows up in your hiring budget.

Your time is the line you never bill

When you screen resumes at 9pm, run interviews between jobs, and train the new hire yourself, you're spending the scarcest resource in the company: the owner's attention. Every hour you pour into cleaning up a rushed hire is an hour you didn't spend on the work only you can do. Value your time at what it's actually worth and the cheap-looking hire gets expensive in a hurry.

Ramp-up takes longer than it looks

Owners consistently underestimate how long a new person needs to reach full output. The first weeks look productive because the new hire is busy, and busy is not the same as effective. They're still learning your systems, your customers, and the hundred unwritten rules that make your business run. For anything past an entry-level role, plan for real productivity to arrive in months, not weeks, and price the gap accordingly.

Stack those four on top of the conservative build and the $18,000 floor for a $55,000 role quietly becomes $30,000 or more. That's the number that belongs in your head the next time you're deciding how much care a hire is worth.

Calculate Your Own Number

Averages prove the point. Your own number changes your behavior. Run it for the last role you had to refill.

1. Write down the salary of the role you most recently refilled.

2. Estimate how many days the seat sat empty, then value the work that simply didn't happen during that stretch.

3. Add your hard recruiting costs: ads, assessments, background checks.

4. Add your time and your managers' time, valued at what an hour of your attention is actually worth.

5. Add a ramp cost: salary paid during the weeks the new person produced below full output.

If you'd rather not do it by hand, our Bad Hire Calculator walks you through it in about two minutes. Most owners are surprised, and a little annoyed, by what comes out.

The Cheapest Replacement Is the One You Never Make

Once you see the real number, the math on hiring changes. Spending an extra week to get the hire right pays for itself many times over. It is the highest-return week in your quarter.

Every dollar in that build assumes you'll have to do this again. You lower the number by hiring people who stay, which is the entire point of a structured process: fewer mis-hires, fewer resignations, fewer $18,000 lessons. That's why I teach the 10-phase hiring system. Each phase, from how you write the job description to the reference checks you actually push on, exists to keep you out of the replacement cycle. I lay out the foundation of it in The Naked Interview.

If you want the flip side of this math, what a single bad hire costs once they're already on your payroll, read The Real Cost of a Bad Hire. And if you're tempted to rush the next hire because you're short-staffed right now, read Desperation Hiring first.

The resignation letter is the cheap part. Everything after it is where the money goes. Count it once, honestly, and you'll never again treat hiring as something to get over with quickly.