The cost of employee turnover: how to calculate it for your business

When a senior person resigns, the visible costs are an advert and perhaps a recruitment fee. The real costs are spread across six months and a dozen cost centres: the work that does not get done, the manager's time, the ramp-up of the replacement and the customers who notice. Because none of it is labelled "turnover", most SMEs never add it up, and so they under-invest in the things that would reduce it.

Putting a defensible number on it changes the conversation. A $5,000 salary correction looks different when the alternative is a $90,000 departure. A proper recruitment process looks different when the cost of getting it wrong is clear. This guide gives you a method you can apply to any role in your business in half an hour.

Research on turnover costs consistently lands in the same range: replacing a skilled professional or manager costs somewhere between half and twice their annual salary, with senior and specialist roles at the upper end. The variation comes from how much of the following you count.

Take a Waikato manufacturing business with 50 staff. Its Operations Manager, paid $120,000, resigns with four weeks' notice. The role is empty for twelve weeks, the replacement is hired through an agency, and takes four months to reach full effectiveness. Here is a conservative estimate.

That is roughly 87% of the salary, and every assumption is conservative. Push the vacancy to five months, count the customer who moved to a competitor when delivery slipped, or add the cost if the replacement turns out to be a mis-hire, and the figure passes 150% comfortably. The only "visible" costs in that table are the agency fee and the advert. The rest is what the business felt and never counted.

1. Vacancy cost. Estimate the weeks the role will be empty. Multiply by the weekly salary, then multiply by a factor for how much the role's absence hurts: 1 for a role whose work simply waits, 2 to 3 for a role where absence costs sales, output or leadership time.
2. Replacement cost. Add advertising or agency fees plus internal hiring time at hourly rates.
3. Ramp-up cost. Estimate months to full productivity and multiply monthly salary by that number by 0.4.
4. Knock-on. Add a judgement figure for lost knowledge, morale and customer impact. If you cannot estimate it, use 10% of salary as a placeholder; it is rarely lower.
5. Add them up, then multiply by annual departures in that role family. That is your annual turnover cost for the group. It is usually a surprising number.

If you do this for every departure over a year and keep the results alongside exit interview themes, you will know exactly where the money is going and why.

• The owner's or GM's time. In an SME, the most senior person absorbs the gap. Their time is the most expensive in the building, and the growth work they were meant to be doing stops.
• Delayed improvements. The lean project, the new line, the supplier renegotiation. Delay has a compounding cost that never appears anywhere.
• Contagion. One senior departure frequently triggers others, especially if the vacancy drags on and the team is stretched. The second departure costs as much as the first.
• Relationships. Customers and suppliers who dealt with the person now deal with someone new. In technical sales and supply chain roles this is often the largest cost of all.
• Institutional knowledge. Why the plant runs the way it does, which supplier is reliable, which customer needs handling carefully. None of it is written down.
• The mis-hire risk. Rushed replacements are more likely to fail. If the replacement leaves at nine months, you pay everything twice. See the cost of a bad hire.

Turnover cost has two levers: how often people leave, and how much each departure costs when they do.

Reduce the frequency

• Benchmark pay annually and fix drift before it becomes the reason. Our salary benchmarking guide explains how.
• Give people a visible next step, even in a flat structure.
• Train managers to run one-on-ones and give feedback. Most avoidable departures are about the manager.
• Hold stay interviews with key people before they are looking.
• Hire realistically in the first place: honest brief, market salary, proper referencing.

The full list is in our guide to staff retention strategies.

Reduce the cost per departure

• Shorten the vacancy. Start the search the day you hear, not after a month of hoping. A specialist recruiter who already knows the market cuts weeks off. See how long recruitment takes.
• Have a succession plan for the critical roles so there is an interim option inside the business. See succession planning.
• Use interim cover for senior roles rather than letting the GM absorb it. A contract Operations Manager for three months usually costs less than the disruption.
• Onboard properly so ramp-up is three months rather than six. See onboarding process.
• Document the role before people leave, not after. Handover notes written under notice are never complete.

Once you have a figure, use it. Take it to the salary review: "Correcting these three people costs $15,000; losing one of them costs $100,000." Take it to the decision about whether to engage a recruiter: the fee is a fraction of the vacancy cost. Take it to the argument about manager training. Most of the things that reduce turnover are cheap, and the number is what gets them approved.

If you want an independent view of where your pay sits and which roles are at risk, our salary and performance review service is designed for exactly that. And if a departure has already happened and the role is sitting empty, talk to us; every week counts.