📊 Labor Burden Explained
The biggest mistake contractors make in estimating is thinking a $50/hour worker costs $50/hour. The real cost — the fully burdened labor rate — is typically 1.4× to 1.8× the base wage. That $50 worker actually costs you $70–$90 per hour. Miss this, and every hour your crew works loses money.
Your burden rate is unique to your company. Two contractors paying the same wage rate will have different burden rates based on their insurance costs, benefit plans, state taxes, and overhead. Calculate YOUR burden — don't use someone else's percentage.
What Is Labor Burden?
Labor burden is everything you pay on top of the worker's base hourly wage. It includes mandatory costs (taxes, insurance) and voluntary costs (benefits, training).
The Components
| Category | Components | Typical % of Base Wage |
|---|---|---|
| Statutory taxes | FICA (Social Security + Medicare), FUTA, SUTA | 10–14% |
| Insurance | Workers' comp, general liability, umbrella | 8–25% |
| Fringe benefits | Health insurance, pension/401(k), vacation, training | 10–45% |
| Paid time off | Holidays, sick days, vacation (if not in fringe fund) | 5–10% |
| Other | Small tools, uniforms, PPE, drug testing, training | 2–5% |
| Total burden | All of the above | 35–90% |
The wide range depends on your trade, location, union status, insurance costs, and benefit plans.
Breaking Down Each Component
1. Statutory Payroll Taxes
These are mandatory — every employer pays them:
| Tax | Rate | Base / Cap |
|---|---|---|
| Social Security (OASDI) | 6.2% | On first $168,600 of wages (2024) |
| Medicare | 1.45% | No cap |
| FICA total | 7.65% | Combined employer share |
| FUTA (Federal Unemployment) | 0.6% | On first $7,000 of wages (after state credit) |
| SUTA (State Unemployment) | 1.0–6.0% | Varies by state and experience rating |
Typical total: 9–14% of gross wages
Remember: if you pay fringe benefits as cash (added to wages), FICA applies to the full amount. If you pay fringes to bona fide plans (trust funds), FICA only applies to the base wage. This difference alone can save 7.65% on the entire fringe amount.
2. Workers' Compensation Insurance
Workers' comp rates vary dramatically by trade and state:
| Trade | Typical Rate (per $100 of payroll) | % of Wages |
|---|---|---|
| Clerical/office | $0.15–$0.50 | 0.15–0.5% |
| Carpentry | $8–$18 | 8–18% |
| Electrical | $4–$10 | 4–10% |
| Plumbing | $4–$8 | 4–8% |
| Roofing | $15–$35 | 15–35% |
| Ironwork (structural) | $15–$30 | 15–30% |
| Concrete | $8–$15 | 8–15% |
| General labor | $10–$20 | 10–20% |
Your actual rate depends on:
- State (rates vary significantly)
- Trade classification code
- Your Experience Modification Rate (EMR) — a multiplier based on your claims history
- Payroll size (larger payrolls may get volume discounts)
3. General Liability Insurance
GL premiums in construction are typically rated on gross receipts or payroll, depending on the classification:
| Trade | Typical Rate (per $1,000 of payroll) |
|---|---|
| General contracting | $15–$40 |
| Electrical | $8–$20 |
| Plumbing | $10–$25 |
| Concrete | $20–$45 |
| Roofing | $30–$60 |
Typical total: 2–6% of payroll
4. Fringe Benefits
The largest variable component — ranges from minimal (open shop, no benefits) to massive (union, full package):
Non-Union Contractor (Typical)
| Benefit | Monthly Cost | Hourly Equivalent |
|---|---|---|
| Health insurance (employee) | $600–$800 | $3.50–$4.60 |
| Health insurance (family) | $1,500–$2,200 | $8.65–$12.70 |
| 401(k) match (3%) | Varies with wage | ~$1.50/hr on $50 base |
| Paid holidays (6 days) | N/A | ~$1.15/hr |
| Paid vacation (1 week) | N/A | ~$0.96/hr |
| Total | $7–$20/hr |
Union Contractor (Typical)
| Benefit | Hourly Rate |
|---|---|
| Health & Welfare | $12–$18 |
| Pension | $8–$15 |
| Annuity/401(k) | $3–$10 |
| Vacation/holiday | $3–$6 |
| Training | $0.50–$2.00 |
| Industry fund | $0.25–$1.00 |
| Total | $27–$52/hr |
5. Other Burden Items
| Item | Typical Cost | How to Calculate |
|---|---|---|
| Small tools & consumables | $500–$2,000/year per worker | Divide by annual hours |
| PPE and safety equipment | $300–$800/year per worker | Divide by annual hours |
| Drug testing | $50–$150/test, 1–4 tests/year | Divide by annual hours |
| Uniforms | $200–$600/year per worker | Divide by annual hours |
| Training & certifications | $500–$2,000/year per worker | Divide by annual hours |
| Recruiting costs | $2,000–$5,000 per hire (amortized) | Divide across expected tenure hours |
Calculating Your Burden Rate
Step-by-Step Example
Worker: Carpenter, $50.00/hr base wage, non-union, in California
| Component | Rate/Amount | Hourly Cost |
|---|---|---|
| Base wage | $50.00/hr | $50.00 |
| FICA (employer) | 7.65% | $3.83 |
| FUTA | 0.6% of first $7K | $0.02 (annualized) |
| SUTA (California) | 3.4% of first $7K | $0.14 (annualized) |
| Workers' comp | 12% | $6.00 |
| General liability | 3% | $1.50 |
| Health insurance (family) | $1,800/month | $10.38 |
| 401(k) match (3%) | 3% | $1.50 |
| Paid holidays (7 days) | 7 days × 8 hrs × $50 | $1.35 (annualized) |
| Paid vacation (5 days) | 5 days × 8 hrs × $50 | $0.96 (annualized) |
| Small tools & PPE | $1,200/year | $0.69 |
| Total burden | $26.37 | |
| Fully burdened rate | $76.37/hr | |
| Burden percentage | 52.7% |
Union Example
Worker: Carpenter, $52.00/hr base wage, union, in California
| Component | Rate/Amount | Hourly Cost |
|---|---|---|
| Base wage | $52.00/hr | $52.00 |
| FICA (employer) — on base wage only | 7.65% | $3.98 |
| FUTA | 0.6% of first $7K | $0.02 |
| SUTA | 3.4% of first $7K | $0.14 |
| Workers' comp — on base wage only | 12% | $6.24 |
| General liability | 3% | $1.56 |
| H&W (to trust fund) | $15.50/hr | $15.50 |
| Pension (to trust fund) | $13.25/hr | $13.25 |
| Annuity (to trust fund) | $8.00/hr | $8.00 |
| Vacation/holiday (to trust fund) | $5.00/hr | $5.00 |
| Training (to trust fund) | $0.85/hr | $0.85 |
| Industry fund | $0.50/hr | $0.50 |
| Total burden | $55.04 | |
| Fully burdened rate | $107.04/hr | |
| Burden percentage | 105.8% |
Notice that the union carpenter's burden is larger than the base wage — the total cost is more than double the hourly rate on the check. This is why understanding burden is critical for estimating union work accurately.
Burden Rate by Trade (Rules of Thumb)
These are rough industry averages — your actual numbers will vary:
| Trade | Non-Union Burden % | Union Burden % |
|---|---|---|
| General labor | 35–50% | 60–80% |
| Carpentry | 40–55% | 70–100% |
| Electrical | 35–50% | 80–110% |
| Plumbing | 35–50% | 80–110% |
| Ironwork | 45–65% | 90–120% |
| Roofing | 55–75% | 80–110% |
| Concrete | 40–55% | 70–90% |
| Operating Engineers | 40–55% | 80–110% |
Burden and Prevailing Wage
On prevailing wage projects, burden interacts differently because the fringe component is prescribed:
How to Think About It
| Component | PW Rate Covers | You Still Pay (Burden) |
|---|---|---|
| Base hourly wage | Yes (prescribed) | Payroll taxes on base wage |
| Fringe benefits | Yes (prescribed — pay to plan or as cash) | Payroll taxes if paid as cash; admin costs if paid to plans |
| Workers' comp | No | You pay this — on applicable wages |
| General liability | No | You pay this |
| Overhead | No | You pay this |
| Other burden | No | You pay this |
Your bid on PW work must include: Prevailing wage (prescribed) + remaining burden + overhead + profit
Why Burden Matters for Estimating
The Cost of Getting It Wrong
| If Your Burden Estimate Is... | Impact on a $5M Labor Project |
|---|---|
| 5% too low | $250,000 lost profit |
| 10% too low | $500,000 in the hole |
| Using the right burden but not updating it annually | Can drift 3–5% per year |
How to Use Burden in Estimates
- Calculate your company-specific burden rate for each trade
- Apply burden to the base wage to get the fully burdened hourly rate
- Multiply burdened rate × estimated hours = labor cost
- Add overhead markup and profit margin
- Update your burden calculation at least annually (insurance renewals, tax rate changes, benefit cost changes)
Reducing Your Labor Burden
| Strategy | Potential Savings | Notes |
|---|---|---|
| Improve safety (lower EMR) | 10–30% on workers' comp | Best long-term strategy |
| Pay fringes to plans, not cash | 7.65%+ on fringe amount (FICA) + WC/GL savings | Significant on PW and union work |
| Use apprentices | 10–60% lower wages | Within allowed ratios |
| Shop insurance annually | 5–15% on premiums | Don't auto-renew — bid it out |
| Manage unemployment claims | Lower SUTA rate | Contest invalid claims, document terminations |
| Hire right (reduce turnover) | Reduce recruiting/training costs | Each turnover costs $5K–$15K+ |
Burden Rate Checklist
Annual Review
- Update workers' comp rates (after annual audit and renewal)
- Update GL rates (after renewal)
- Update FICA wage base (changes annually)
- Update SUTA rate (from state notification)
- Update health insurance costs (after renewal)
- Update 401(k)/pension contribution rates
- Update holiday schedule and PTO policies
- Recalculate burden rate for each trade classification
- Update estimating templates with new rates
Related Resources
- Fringe Benefits in Construction — Deep dive into fringe components
- Prevailing Wage Guide — How burden interacts with PW
- Workers' Comp Guide — EMR and premium management
- Overhead & Markup — Adding overhead to your burdened rate
- Job Costing Basics — Tracking actual vs. estimated burden
- Estimating Basics — Building accurate labor estimates