The real cost of losing an employee

If you want a retention case to land, give the decision-maker a number they can defend to their own boss. The research makes that surprisingly doable.

The headline range

Gallup’s widely-cited figure is that replacing an individual costs between one-half and two times their annual salary — explicitly “a conservative estimate.” SHRM states the same range a different way (50% to 200% of salary, depending on level). For a more granular anchor, the Center for American Progress synthesised 30 case studies across 11 peer-reviewed papers and found a median turnover cost of ~21% of annual salary for roles under £75k, about 16% for the lowest-paid roles, and up to ~213% for senior and executive positions.

So scale your estimate to the role. A flat number invites argument; a role-appropriate multiplier doesn’t.

Two-thirds of the cost is invisible

The figure most pitches miss is the intangible one. Built In, citing SHRM, reports that roughly two-thirds of turnover cost is intangible — lost institutional knowledge, broken relationships, reduced coverage, and the morale hit to the people left behind. (Treat the exact two-thirds as a strong estimate rather than a hard constant; the direction is well-supported even where the precise share varies by role.)

The ramp you’re also paying for

A replacement isn’t productive on day one. Industry benchmarks (via Gallup-sourced data) put time-to-full-productivity at roughly 6 to 12 months, with output reduced by an estimated 25–50% during the ramp. For a senior or specialised role, that’s most of a year at partial output — a cost that never appears on the recruiting invoice but is very real.

How to use it

• State the replacement cost as a range tied to the role, not a single guess.
• Name the intangibles explicitly — which relationships, which systems only they understand, who has to cover.
• Add the ramp: even a perfect hire is months from full speed.

You’re not exaggerating. You’re counting things the org was about to write off as free.