What Is That Open Position Really Costing You?

How We Calculate the Cost of an Empty Seat

The vacancy cost formula has three components, each calculated as a fraction of the role's weekly salary equivalent:

• Lost output — The work this person would have been doing. For an individual contributor, this is roughly their salary equivalent (adjusted by role type — revenue-generating roles lose more because their output directly drives income). Every week the seat is empty, that output is either not happening or happening at lower quality.
• Team overload cost — When someone leaves, the remaining team absorbs their work. This means overtime (paid or unpaid), higher stress, more mistakes, and slower delivery on everything else. The cost scales with how small the remaining team is — losing 1 person from a team of 3 hits harder than losing 1 from a team of 10.
• Opportunity cost — Projects that get delayed, clients that don't get the attention they need, initiatives that get shelved. These costs are harder to quantify but very real — especially for specialist and revenue-generating roles where the empty seat blocks work that can't be redistributed.

Why Most Managers Underestimate Vacancy Cost

Most managers think of an open position as "saving" the salary. "We're not paying anyone, so we're saving money." This is dangerously wrong. You're not saving the salary — you're spending it in hidden ways: overtime, burnout, missed deadlines, lost clients, and eventually losing more people who are tired of carrying the extra load.

A SHRM benchmarking study found that the average time-to-fill is 42 days. For a role paying $80,000/year, that's roughly $13,000 in vacancy costs before you even start paying the new hire. Add another 3-6 months of ramp-up time, and the true cost of an empty seat extends well beyond the hiring date.

The most dangerous period is weeks 4-8. By that point, the initial "we can handle it" energy from your team has faded. The workload has been redistributed for a month, people are tired, and if they don't see a hire coming soon, they start updating their own resumes. This is how one empty seat becomes two — and at that point, you've entered a turnover cost spiral that's much harder to recover from.

Four Ways to Reduce Vacancy Time

1. Write a clear job description before you need it. Most hiring delays happen at the start — it takes 1-2 weeks just to align on what you're looking for. Having a ready-to-post job description saves you that time entirely.
2. Always be passively recruiting. The best hires often come from your network, not from job boards. Keep a mental shortlist of people you'd love to work with. When a seat opens, you already have 2-3 people to reach out to before the job is even posted.
3. Streamline your interview process. Every extra interview round adds 1-2 weeks. A focused process — phone screen, one skills interview, one culture fit — can be done in 2 weeks instead of 6. Have your interview questions ready in advance.
4. Make decisions faster. "Let's see a few more candidates" is the most expensive sentence in hiring. If you've found someone who meets 80% of your criteria, the cost of waiting for a 90% match is the vacancy cost per week times however many weeks you keep looking. Often, the 80% candidate who starts 3 weeks sooner generates more value than the 90% candidate who starts later.

How to Present This Number to Your Boss

If you're trying to get hiring approval or speed up a slow process, this calculator gives you the ammunition. Here's the conversation framework:

"The open [role] position is costing us approximately $[X] per week in lost output, team overload, and delayed projects. At our current pace, we're looking at [Y] more weeks to fill — that's $[Z] in total vacancy cost. I'd like to discuss [specific action: using a recruiter, offering a signing bonus, simplifying the interview process] to reduce that timeline."

This framing works because it's not a complaint — it's a business case with real numbers. For more on how to have this kind of conversation with your boss, see our guide on managing up.