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 — and the honest number is far bigger than the recruiter invoice everyone pictures.

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 studies and found a median turnover cost of ~21% of annual salary for most roles, about 16% for the lowest-paid roles, and up to ~213% for senior and executive positions. (Their salary brackets are in USD — roughly under $30k and under $75k — but the multipliers travel.)

So scale your estimate to the role. A flat number invites argument; a role-appropriate multiplier doesn’t. The takeaway both sources agree on: seniority and specialisation push the cost up sharply, because harder-to-fill roles take longer to fill and longer to get up to speed.

Direct vs. indirect — and why two-thirds is hidden

The CAP analysis splits turnover cost into two buckets. The direct costs are the obvious ones: separation and any severance, temporary coverage, advertising and search, screening and interviewing, and onboarding and training. The indirect costs are the ones pitches forget: lost productivity while the seat is empty and during ramp, reduced output from the team picking up slack, lost institutional knowledge, and damaged client or colleague relationships.

Built In, citing SHRM, reports that roughly two-thirds of turnover cost is intangible — knowledge and productivity, not hiring fees. Treat the exact two-thirds as a strong estimate rather than a hard constant; the precise share varies by role, but the direction is well-supported. The practical implication: if your case only counts the recruiter fee, you’re arguing with a third of the real number.

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. Whoever covers in the meantime is also doing two jobs, which is where quiet, second-order attrition starts.

A worked example

Take a mid-level role at £45k. Gallup’s 0.5–2× puts replacement at £22.5k–£90k. Even CAP’s conservative ~21% median lands near £9k–£10k in direct-plus-some-indirect terms — and that still excludes most of the 6–12 month ramp. Present it as a range, show your working, and let the decision-maker sit with the fact that the "cheap" option (let them go) has a five-figure price tag attached.

How to use it in a pitch

• State the replacement cost as a range tied to the role, not a single guess — ranges read as honest; a suspiciously precise single number reads as made up.
• Name the intangibles specifically: which relationships, which systems only they understand, who has to cover and what slips while they do.
• Add the ramp: even a perfect hire is months from full speed, and you pay for every one of those months.
• Contrast it with the cost of keeping them — usually a raise or a retention conversation that’s a fraction of the replacement number.

You’re not exaggerating. You’re counting things the organisation was about to write off as free. If you want the exact breakdown for a salary figure, see how much it costs to replace an employee.