Voluntary Turnover Rate
Voluntary exits over a trailing period, expressed as an annualized percentage of average headcount — the headline attrition number on the HR scorecard. Anchored to the Mercer US Turnover Survey methodology (Mercer reports voluntary vs involuntary turnover annually). Common pitfall: comparing a single quarter's annualized rate against an annual benchmark — short-window annualization is noisy. Best practice is trailing-12-months for benchmark comparison and trailing-3 or trailing-6 for trend reads. Per #1426: stage-specific industry norms here are folk-wisdom unless tied to a specific Mercer or comparable published cut. — HR KPI anchored to Mercer US Turnover Survey 2025.
Rogue ID: hr.voluntary_turnover_rate
Type: Percentage (%)
Domain: HR
Definition
Voluntary exits over a trailing period, expressed as an annualized percentage of average headcount — the headline attrition number on the HR scorecard. Anchored to the Mercer US Turnover Survey methodology (Mercer reports voluntary vs involuntary turnover annually). Common pitfall: comparing a single quarter's annualized rate against an annual benchmark — short-window annualization is noisy. Best practice is trailing-12-months for benchmark comparison and trailing-3 or trailing-6 for trend reads. Per #1426: stage-specific industry norms here are folk-wisdom unless tied to a specific Mercer or comparable published cut.
Formula
Voluntary Turnover Rate (annualized) = (Voluntary Exits in period / Average Headcount in period) × (12 / months in period) × 100. Average headcount = (start headcount + end headcount) / 2 is the simplest acceptable convention; (Σ daily headcount / days in period) is more precise. Per Mercer US Turnover Survey methodology.Why it matters
The canonical retention KPI investors and boards benchmark against. Tracks the cost of churn — every voluntary exit triggers a replacement-cost cycle (recruiting + onboarding + ramp), commonly estimated at 0.5–2× the role's annual salary depending on level (industry folk-wisdom, not citation-grade).
How to interpret
US all-industry voluntary turnover is typically 13–17% annualized per Mercer US Turnover Survey 2025 (§Voluntary Turnover). Tech sector typically runs higher than the all-industry average; engineering and sales roles run highest within tech. Sustained voluntary turnover above ~20% annualized at any stage is a board-action trigger; sustained sub-5% can indicate under-performance management (managers not exiting B-players). Compare trailing-12-month rates, not quarterly snapshots.
Related KPIs
hr.voluntary_exitshr.involuntary_turnover_ratehr.at_risk_counthr.retention_initiativeshr.talent_challenges
Source
Mercer US Turnover Survey 2025 · section: Voluntary Turnover — published 2025-03-01.
Why does this cite Mercer US Turnover Survey 2025? Read the ontology methodology for the published vs editorial tier system, attribution rules, and dispute process.
Industry benchmark
A reference distribution sourced from Mercer US Turnover Survey 2025 (2025):
| Percentile | Value |
|---|---|
| 25th | 7% |
| Median | 11% |
| 75th | 17% |
Lower is better.
Stage relevance
| Company stage | Priority |
|---|---|
| Series A | Core |
| Series B | Core |
| Series C+ | Core |
| Public | Core |
Suggested for stages: Series A, Series B, Series C+, Public.
Default owning functions
- HR
Machine-readable
- This KPI as JSON:
/api/ontology/hr/voluntary_turnover_rate.json - All HR KPIs:
/api/ontology/hr.json - Full catalog:
/api/ontology/index.json
Voluntary Exits
Count of employees who resigned during the period (initiated by employee, not the company). The numerator of the `hr.voluntary_turnover_rate` calculation and the headline "are we losing people" number boards anchor on. Common pitfall: ambiguous "mutually agreed" exits — companies sometimes log managed-out exits as voluntary to keep the visible number low. Define the test: if the employee initiated the conversation and there was no formal performance trigger, it is voluntary; otherwise log as termination. — HR KPI, I'mBoard-authored (editorial tier).
Product KPIs
Roadmap, delivery, R&D efficiency, quality. 18 KPIs in this domain — 1 anchored to third-party standards, 17 editorial.