The Hidden Cost of Losing an Employee (and How to Calculate It)

An employee resigns, and the first reaction is usually: "we need to find someone, fast." You post the opening, run interviews, hire, and feel like the problem is solved. But that process carries a cost that almost never gets measured, and it can be much higher than it looks at first glance.

Why the new salary isn't the real cost

When someone leaves, you're not just paying the new hire's salary. There's also:

• Recruiting time: hours you or your team spend reviewing resumes, interviewing, and deciding.
• The learning curve: a new hire produces less at first, while they learn processes, clients, and tools.
• Everyone else's productivity: someone on your team usually covers the open role or trains the new person, taking time away from their own work.
• Early mistakes: it's normal for someone new to make errors that later need fixing.
• Lost relationships: if the role deals with clients or suppliers, some of that trust has to be rebuilt from scratch.

None of these costs show up as a separate line in your accounting, but they do hit your bottom line.

How to estimate it, step by step

You don't need a perfect formula, just an honest exercise:

1. Calculate the cost of the hiring process. Add up the hours you or your team spend posting, screening, and interviewing, multiplied by their approximate hourly value (monthly salary divided by working hours).
2. Estimate the ramp-up time. How many weeks or months pass before the new hire performs at the expected level? During that time, you can assume they produce, say, 50-70% of normal output.
3. Add the training hours. Someone on your team spends time explaining processes; that time also has a cost.
4. Factor in the uncovered period. If the role sat empty for several weeks, some work went undone, got delayed, or landed on someone else under pressure.

An illustrative example

Suppose an employee with a monthly salary of 2,000,000 resigns. As a simple example:

• Hiring process: 15 hours of your time and a colleague's, equivalent to about 300,000.
• Three weeks with the role only partially covered: part of the work gets split across the team, with an estimated cost of 500,000 in overtime and delayed tasks.
• Two months of ramp-up, performing at 60%: this can represent close to 800,000 in "lost" productivity compared to having someone already trained.

Adding up these illustrative figures, losing and replacing that person can cost more than 1,600,000, on top of the regular salary you were already paying. These are example numbers, but running the exercise with your own figures tends to surprise more than one small business owner.

What to do with this calculation

Understanding the real cost of turnover isn't meant to cause anxiety, it's meant to help you make better decisions:

• Prioritize retention of key people: sometimes a small salary or condition adjustment is cheaper than the entire replacement process.
• Document processes. If knowledge doesn't live only in one person's head, the replacement's learning curve is shorter.
• Measure before deciding. If you're weighing a raise, compare it against the real cost of that person leaving.
• Build it into your financial planning. Staff turnover is part of your fixed costs, even if irregular; it's worth keeping on your radar when projecting cash flow.

Having your costs and cash flow organized in one place makes it much easier to see the real impact of decisions like this, instead of discovering it months later when you review the numbers.

If you want to make these kinds of decisions with clear data, try Miscostosfijos free for 7 days: sign up here.