When an employee gives their two weeks' notice, most managers think about the immediate pain: covering their workload, posting the job, interviewing candidates. What rarely gets calculated is the full economic cost, and it's almost always larger than anyone expects.
The Four Categories of Turnover Cost
1. Separation Costs
Final paycheck processing, exit interviews, potential severance, COBRA administration, and HR offboarding time. For a $65k employee, this typically runs $1,500–$3,000.
2. Recruiting & Hiring Costs
Job board postings, recruiter fees (typically 15–25% of first-year salary), background checks, and hiring manager time. A mid-level role takes 36–42 days to fill on average, involving 3–5 managers spending 6–10 hours each.
3. Onboarding & Training
SHRM research suggests it takes 8 months to a year for a new hire to reach full productivity. During ramp-up, you're paying full salary for partial output, plus a more experienced employee's time to train them.
4. Lost Productivity & Institutional Knowledge
When a tenured employee leaves, they take years of institutional knowledge: client relationships, process shortcuts, undocumented decisions. This can't be captured in an onboarding doc.
The Retention Math
A $5,000 raise to retain a valued employee costs $5,000/year. Replacing that employee costs $37,500–$150,000 in one shot. The math almost always favors retention, often by a factor of 10x.
What This Means for HR Strategy
- Counter-offers are often economically rational for high performers.
- Stay interviews, proactive conversations about what would make someone leave, are one of the highest-ROI retention tools available.
- The single biggest predictor of voluntary turnover is the employee's relationship with their direct manager.
Use our Turnover Cost Calculator to put real numbers on your departures and make the business case for retention investments.
Estimate the full cost of replacing an employee, recruiting, onboarding, and lost productivity.