Every automation business case, 3PL make-vs.-buy model, and operational benchmark should use burdened labor cost, not the hourly wage. The difference between the two is the reason most ROI models understate the true savings from labor-reducing investments.
An $18/hr warehouse worker costs $27–34/hr fully loaded, depending on state, benefits package, and management overhead. Models that use $18 instead of $30 understate ROI by 40–65%.
[!info] Base Wage Floor — 2026 Note The $18/hr example in this model is the illustrative multiplier anchor, not a minimum. As of 2026, $18/hr is below the effective minimum for large employers in several high-population labor markets (California large employer minimum: $20/hr; Washington: $16.66/hr; New York City: $16.50/hr). In high-cost markets, use a local base wage for precision modeling — the 1.55–1.75× burden multiplier applies regardless of base.
The Cost Stack
| Component | Calculation | $/hr (at $18 base) |
|---|---|---|
| Base wage | $18.00 | $18.00 |
| FICA (employer) | 7.65% | $1.38 |
| Federal/state unemployment | ~2.5% (avg) | $0.45 |
| Workers’ compensation | 2-5% (warehouse category) | $0.54-$0.90 |
| Health insurance (employer share) | $4-6/hr equivalent | $4.00-6.00 |
| PTO and vacation (10 days = 3.85%) | 3.85% | $0.69 |
| Overtime premium (10% of hours at 1.5x) | net premium = 5% | $0.90 |
| Training and onboarding amortization | $1,500/hire ÷ ~1 year tenure | $0.72 |
| Supervision overhead | 1 supervisor per 12 workers at $55K fully-loaded | $2.20 |
| Total | $28.88-$31.24 |
Rule of thumb: 1.55-1.75x base wage for fully-loaded warehouse labor in the U.S. (2025). Use 1.65x as the default when building quick models. Verify against your own benefits data for detailed analysis.
Turnover Makes It Worse
U.S. warehouse worker annual turnover runs 40–49% (BLS JOLTS 2022–2025; 2025 annual JOLTS data now published). At a 200-worker DC, that is 80–100 workers cycling out annually.
Full replacement cost per worker (recruiting, onboarding, training, productivity ramp, uniform and PPE):
| Cost element | Range |
|---|---|
| Recruiting (job board, agency fee, internal HR time) | $400-1,200 |
| Pre-employment (background check, drug screen, physical) | $150-350 |
| Orientation and initial training | $800-1,500 (30+ hours at loaded rate) |
| Productivity ramp (6-12 weeks at 60-80% output) | $1,200-3,000 |
| Total per replacement | $2,550-6,050 |
At 90 replacements per year: $230K-$545K annually in turnover costs alone, before the impact on throughput and accuracy during ramp-up periods.
How to Use This in an Automation Business Case
Use fully-loaded labor cost in both the baseline and the savings calculation. The most common error is calculating the baseline at fully-loaded rate but savings at base wage, or vice versa.
For labor reduction (automation replaces FTEs): savings = FTEs eliminated × fully-loaded annual cost per FTE.
For labor redeployment (automation reassigns FTEs to higher-value tasks): savings = productivity gain × hours redeployed × fully-loaded rate for the higher-value task. This is smaller than elimination but more realistic for most operations.
For the business case narrative: present the $30/hr fully-loaded figure when building the baseline. Most leadership teams anchor on the wage line in payroll and don’t internalize the full cost. Showing the stack explicitly is part of making the case.
State Variation
Workers’ compensation rates vary significantly by state and job classification. California warehouse workers’ comp runs 4-7% of wages; Texas non-subscriber environments are lower. Cold storage commands a 15-30% wage premium and typically higher workers’ comp classification.
For quick modeling, use $30/hr as the national average for a standard fulfillment/distribution worker at $18-19 base wage. Adjust upward by $2-3/hr for cold storage and high-turnover environments.