The most common mistake when budgeting headcount is using base salary as the cost. The true employer cost of an employee is base salary × 1.25 to 1.45 for most US knowledge workers, driven by mandatory payroll taxes and benefits.
What Makes Up Total Employee Cost
1. Employer payroll taxes (~7.65%) - FICA: 6.2% Social Security (on first $168,600) + 1.45% Medicare (no cap) - FUTA: 0.6% effective federal unemployment (on first $7,000 of wages) - SUTA: ~2.7% average state unemployment tax rate (on first $7,000–$56,500, varies by state)
2. Health insurance - Average employer cost: $8,000–$18,000/year per employee (2024 KFF data) - Family coverage: $14,000–$22,000/year - Self-only: $7,000–$10,000/year
3. Retirement contributions (optional) - 401(k) match: typically 3–6% of salary - At $100k salary with 4% match: $4,000/year
4. Bonus and equity - Target bonus for knowledge workers: 10–20% of base - Equity grants (RSUs (Restricted Stock Units)): $5,000–$50,000/year depending on level
The 1.25x to 1.4x Rule of Thumb
A quick mental model: multiply any salary by 1.3x for a fully-loaded employment cost estimate (taxes + health insurance + 401k match, no bonus). Add 15–20% for bonus-eligible roles.
| Salary | Taxes (~8%) | Benefits (~12%) | Total (1.2x) | + 10% Bonus (1.3x) |
|---|---|---|---|---|
| $80,000 | $6,120 | $9,600 | $95,720 | $103,720 |
| $120,000 | $9,180 | $14,400 | $143,580 | $155,580 |
| $150,000 | $11,475 | $18,000 | $179,475 | $194,475 |
Contractors vs. Employees
When comparing a W-2 hire to a contractor, remember that the contractor's rate includes their own taxes and benefits. A contractor at $75/hour is not 1.3x more expensive than an employee — the contractor is paying their own 15.3% SE tax and benefits. The true cost comparison requires adding the employee burden to the salary before comparing.
Attrition adds to the cost of an employee; the employee turnover calculator shows your turnover rate and what it costs per year.
Frequently asked questions
What payroll taxes does the employer pay? Employers pay FICA (7.65%: 6.2% Social Security + 1.45% Medicare), FUTA (effective 0.6% on first $7,000 of wages), and SUTA (state unemployment tax, ranging from 0.6% to 8.5% depending on state and rate experience).
How much does health insurance cost the employer? According to the 2024 Kaiser Family Foundation survey, employers pay an average of $8,435/year for single employee coverage and $17,393/year for family coverage. This is the largest variable in the cost multiplier after payroll taxes.