Labor Burden and Overhead Allocation in Construction Accounting
Labor burden and overhead allocation are the two operational disciplines that determine whether construction job costing reflects true profitability or just direct costs. Operations that handle both correctly produce job-level data that supports operational decisions about which work is actually profitable, how to price, and where to invest in capacity. Operations that handle either or both incorrectly produce data that systematically overstates job profitability, with predictable consequences for the operational decisions that depend on the data being accurate.
The math is straightforward. Construction labor isn't just gross wages; it's gross wages plus payroll taxes plus workers' comp plus benefits plus paid time off accruals plus other employer costs. According to the U.S. Bureau of Labor Statistics, total employer compensation costs for private industry workers averaged $46.15 per hour worked in December 2025, with wages and salaries averaging $32.36 per hour and benefit costs averaging $13.79 per hour. That's roughly 30% of total compensation going to benefits and legally required costs beyond wages, with construction often running higher due to workers' comp rates and union benefit structures. Operations that cost jobs using gross wages systematically understate labor cost by 35-65% depending on workforce structure.
This article covers what labor burden actually includes, how to calculate burden specifically for your operation, the overhead allocation methodologies that work, and how software supports the workflow. The foundational explainer on job costing can be found in our job costing for contractors guide. The deeper coverage of common job costing mistakes is in our guide here.
What Labor Burden Actually Includes
Strong burden calculations capture all employer costs related to having employees beyond just gross wages.
Federal Payroll Taxes
The first burden category is federal payroll taxes the employer pays:
FICA (Social Security and Medicare): Employer pays 7.65% on wages up to the Social Security wage base ($168,600 for 2026) plus 1.45% on all wages above that. Effective rate runs 6.2-7.65% depending on workforce wage levels.
FUTA (Federal Unemployment): Employer pays 6.0% on first $7,000 of wages per employee, with most operations qualifying for 5.4% credit producing effective rate of 0.6%.
Other federal: Specific industries may face additional federal obligations.
Total federal payroll tax burden typically runs 7-8% on top of base wages.
State Payroll Taxes
State-specific payroll taxes vary by state:
State Unemployment Insurance (SUI): Rates vary by state and by experience rating. Base rates run from approximately 0.5% to 6%+ depending on state and operation history. Wage bases also vary (typically $7,000 to $40,000+ depending on state).
State Disability Insurance: Some states (CA, NY, NJ, RI, HI) have employer-paid state disability programs.
Workers' Comp: While typically classified separately from "payroll taxes," workers' comp is essentially required and varies enormously by state and by class code (industry/work type). Rates can run from under 1% to over 25% depending on work type.
Local Taxes: Some localities (Pennsylvania municipalities, Ohio cities, others) have local employer taxes.
State payroll tax burden typically runs 2-15% depending on state, work type, and operation experience rating.
Workers' Compensation Specifically
Workers' comp deserves specific attention because of its variability:
Rated by class code (different rates for different trades)
Varies enormously by state
Affected by experience modifier (operations with claims history pay more)
Some states have monopolistic state funds; others have private market
For construction operations, workers' comp can run 4-30%+ depending on work type. High-risk trades (roofing, demolition, structural steel erection) typically face higher rates than lower-risk trades (interior finishes, light electrical). See our full insurance requirements by state page for a closer look.
Health and Welfare Benefits
For operations providing employee benefits:
Health insurance premiums (employer portion)
Dental and vision insurance
Life insurance
Disability insurance (short-term and long-term)
Other voluntary benefits with employer contributions
Health insurance alone typically runs $5,000-$15,000+ per employee per year for operations providing coverage. Spread across 2,000 hours, that's $2.50-$7.50+ per hour of additional cost.
Retirement Contributions
For operations offering retirement benefits:
401(k) employer match
Defined benefit pension contributions (rare in modern operations)
Other retirement plan contributions
Typical 401(k) match (3-6% of wages) adds meaningful burden when employees participate.
Paid Time Off
Vacation, holiday, sick, and personal leave that employees take while still being paid represents employer cost not directly related to productive hours:
Hours paid but not worked
Effectively increases the cost per productive hour
Typically 8-15% of total wage costs
Some operations track PTO accruals and apply burden accordingly. Others fold PTO into general burden calculations.
Union Benefits
For union workforces, union benefit funds add specific costs:
Pension fund contributions
Health and welfare fund contributions
Vacation and supplemental fund contributions
Training fund contributions
Industry advancement contributions
Dues collection and remittance
Union benefits often run 25-45% of base wages depending on local agreement. The deeper coverage is in our construction payroll software article.
Other Employer Costs
Various other costs sometimes get included in burden calculations:
General liability insurance attributable to labor
Auto insurance for company vehicles operators use
Bonus accruals if regular
Tools and equipment provided to workers
Uniforms if required
Training costs
Drug testing and background checks
The decision about what to include in labor burden vs separate categories depends on operational preference and analytical needs.
Pro Tip: Calculate your labor burden specifically for your operation rather than using industry averages. Industry averages can be wildly off for specific operations because workers' comp class codes, state-specific tax rates, benefit structures, and experience ratings produce significant variation. Operations using 30% burden when their actual is 55% systematically understate labor cost by 25 percentage points. Operations using 60% burden when their actual is 40% systematically overstate. Take 4-8 hours of analytical work to calculate your specific burden once, document the calculation, and update annually.
How to Calculate Labor Burden Specifically
The calculation approach below produces operation-specific burden that matches reality.
Step 1: Identify Total Labor-Related Costs
For a recent annual period, identify total costs related to labor:
Total gross wages
Total federal payroll taxes (employer portion)
Total state payroll taxes (employer portion)
Total workers' comp premiums
Total health and welfare benefit costs (employer portion)
Total retirement contributions
Total union benefits if applicable
Other labor-related costs as defined
The total represents fully-loaded labor cost for the period.
Step 2: Calculate Burden Percentage
Burden percentage is calculated as:
(Total Labor Costs - Gross Wages) / Gross Wages = Burden Percentage
For example, if gross wages were $1,800,000 and total labor costs were $2,790,000, the burden is:
($2,790,000 - $1,800,000) / $1,800,000 = $990,000 / $1,800,000 = 55%
This means for every $1.00 of gross wages, the operation actually spends $1.55 on the worker.
Step 3: Apply Burden in Job Costing
When labor flows to jobs, burden gets applied:
$50/hour gross wage × 1.55 = $77.50/hour fully burdened labor
1,000 hours of labor on a job × $77.50 = $77,500 fully burdened labor cost
vs $50,000 if only gross wages were used (a $27,500 difference)
The fully-burdened labor reflects what the operation actually spent supporting the work.
Step 4: Different Burden Rates for Different Worker Categories
Operations may have meaningfully different burden for different worker categories:
Union vs non-union workers (union benefits add significant burden)
Salaried vs hourly (different benefits typically)
Different states (workers' comp and SUI vary)
Different trades (workers' comp class codes vary)
Officers and managers vs field workers
Strong calculations support different burden rates by category rather than using single rates that average across categories. Generic single-rate burden produces less accurate job costing than category-specific burden.
Step 5: Update Burden Periodically
Burden percentages change over time:
Workers' comp rates change annually
Benefit costs increase
Union agreements change
State tax rates change
Operation-specific experience ratings change
Annual review at minimum is appropriate. More frequent review for operations with significant cost changes.
Common Burden Calculation Mistakes
Several mistakes show up regularly:
Mistake 1: Using gross wages instead of total compensation. Gross wages doesn't include the employer's portion of various costs. The calculation should start with total employer cost.
Mistake 2: Forgetting workers' comp. Workers' comp often runs 5-25% by itself. Operations forgetting workers' comp produce burden calculations 5-25 percentage points too low.
Mistake 3: Applying single burden rate when categories matter. Operations with mixed union and non-union workforces need category-specific burden, not blended.
Mistake 4: Updating burden too rarely. Burden percentages drift over time as costs change. Operations using 5-year-old burden rates often have significantly inaccurate labor costing.
Mistake 5: Including or excluding inconsistently. Decide what's in burden and what's separate, then apply consistently. Some operations include PTO in burden; some treat it separately. Either approach works, but consistency matters.
Case Study: A 25-person commercial subcontractor implemented operation-specific labor burden calculation in early 2024 after years of using a 35% generic burden estimate inherited from their original CPA. The detailed analysis revealed their actual burden was 58% (10 percentage points higher than they'd assumed for the longest-running portion of their operation, and 15 percentage points higher for newer hires with full benefits). Specific drivers: workers' comp ran 12% of wages due to specific class codes their work involved, health insurance had grown to nearly $14,000 per covered employee annually (up from $9,000 when their burden estimate was last updated), and retirement contributions had been added to their benefit package since the original burden estimate. The corrected burden produced significantly different job costing. Several jobs they'd showing as profitable were actually marginal at best with proper burden. The estimating process was adjusted to use the corrected burden, with bid pricing reflecting actual labor cost rather than understated cost. Within 12 months, win rate dropped slightly on competitive bids (because pricing reflected actual costs rather than being aggressive based on understated costs), but margin on awarded work improved meaningfully. Annual margin improvement attributable to corrected burden alone ran approximately $145,000 on $7M of revenue. The lesson was that specific burden calculation produces operational visibility that generic estimates can't match. The investment in proper calculation pays back through more accurate pricing and operational decisions.
Overhead Allocation to Jobs
Beyond labor burden, operations have overhead costs (general administrative, office, indirect costs) that need to be allocated to jobs to produce true profitability.
Why Overhead Allocation Matters
Operations have indirect costs not directly tied to specific jobs:
Office staff (admin, accounting, HR)
Office facility costs (rent, utilities, insurance)
General insurance not directly tied to projects
Vehicles and equipment used for general operations
Software and technology not directly project-tied
Professional services (CPA, legal, consultants)
Marketing and business development
These costs are real and need to be covered by project margins. Job costing without overhead allocation shows direct margin (revenue minus direct costs) rather than true profitability after all costs are considered.
Allocation Methods
Several methodologies work for overhead allocation:
Percentage of Direct Costs: Apply X% to each job based on total direct costs (labor, materials, equipment, subs, other direct).
Simple to calculate
Reasonable approximation when overhead scales with project size
May misallocate when projects have different overhead intensity
Percentage of Direct Labor: Apply X% to each job based on direct labor cost.
Reasonable when overhead correlates with labor (admin support, supervision)
Less accurate for highly equipment-intensive or material-intensive work
Dollars Per Direct Labor Hour: Apply $X per direct labor hour to each job.
Similar logic to percentage-of-labor but expressed as rate
Useful when supervision and admin scale with hours rather than wage levels
Percentage of Revenue: Apply X% to each job based on revenue.
Simple but tends to misallocate to high-margin vs low-margin projects
Less common in construction than other methods
Activity-Based Costing: Allocate specific overhead categories based on cost drivers:
Admin time tracked to projects
Equipment yard costs allocated based on equipment usage
Software costs allocated based on user activity
Different categories using different drivers
Activity-based is most accurate but most complex. Operations sometimes use simpler methods for general overhead and activity-based for specific significant categories.
Calculating the Allocation Rate
For percentage-based methods:
Annual Overhead / Annual Direct Costs (or Labor, or Revenue) = Allocation Rate
For example: Annual overhead of $480,000 with annual direct labor of $2,400,000 produces a 20% labor-based overhead allocation rate.
Setting Methodology
The right methodology depends on operation characteristics:
Operations where overhead scales with size: Percentage-of-direct-costs works well
Operations where supervision scales with labor: Percentage-of-labor or dollars-per-hour
Operations with very different overhead intensity by project type: Activity-based may produce better accuracy
Operations where simplicity matters more than precision: Simpler methods often work adequately
Periodic Review and Update
Overhead allocation rates should be reviewed periodically:
Annual review at minimum
Adjustments when overhead changes significantly
Reset when operation size or structure changes substantially
Documentation supporting the methodology
What Overhead Allocation Reveals
When overhead is allocated consistently across jobs, the resulting job profitability data reveals:
Which jobs produce true profit after all costs
Which job types have favorable overhead absorption
Which projects warrant additional pursuit
Where operational improvement opportunities exist
Operations without overhead allocation make these decisions on incomplete data; operations with consistent allocation make them on complete data.
How Software Supports Overhead Allocation
Strong platforms support overhead allocation:
Allocation methodology defined at the operation level
Automatic application as transactions flow to jobs
Reporting that distinguishes direct from allocated costs
Periodic adjustment as rates change
Documentation of allocation basis
The deeper coverage of job costing software features read our full guide.
Pro Tip: When implementing overhead allocation, run parallel reporting initially: standard P&L and job costing without allocation alongside reports with allocation applied. The parallel view supports the team's adjustment to seeing job profitability after overhead, which often shows lower margins than the team is used to seeing. Operations that switch to overhead-allocated reporting overnight sometimes face confusion about why margins look different. Operations that introduce allocation alongside familiar reporting build understanding gradually. After 2-3 months, the team typically prefers the allocated reporting because it's more useful for decisions, and the parallel non-allocated reporting can be retired.
Burden and Overhead Determine Job Costing Truth
Construction labor burden and overhead allocation are the disciplines that distinguish job costing showing true profitability from job costing showing direct margin. Operations that handle both correctly produce data supporting operational decisions about which work to pursue, how to price, and where to invest in capacity. Operations that handle either incorrectly produce data that systematically misrepresents profitability, with implications for every decision that depends on the data being accurate.
The investment to handle both correctly is meaningful but bounded. Burden calculation requires analytical work but isn't ongoing burden once established. Overhead allocation methodology defined once applies automatically through software. The returns show up across years through better operational decisions, more accurate estimating, and the strategic insights that accurate cost data supports. For operations beyond the smallest scale, treating burden and overhead allocation as core operational discipline produces meaningful return on the analytical investment.
Frequently Asked Questions
What's a typical labor burden for construction?
Industry averages run 35-65% depending on workforce structure. Non-union open-shop operations typically run 35-50%. Union operations typically run 45-65%. Operations with rich benefit packages run higher; operations with minimal benefits run lower. Workers' comp class codes drive significant variation: trades with high workers' comp rates (roofing, structural steel, demolition) run higher burden than trades with low workers' comp rates (interior finishes, light electrical). The right answer for your operation depends on your specific cost structure rather than industry averages, but knowing where your operation falls in the typical range helps validate calculations.
Should I use one burden rate or multiple rates?
For operations with relatively consistent workforce (similar workers' comp class codes, similar benefits), single rate works adequately. For operations with significant variation (mixed union and non-union, multiple trades with different workers' comp rates, mixed benefit eligibility), multiple rates produce more accurate job costing. Strong platforms support category-specific rates that apply automatically based on worker category. Operations using single rates when they should use multiple rates produce systematic distortion in job costing toward whichever category dominates the rate calculation.
How do I allocate overhead to jobs?
Several methodologies work depending on operation characteristics. Percentage-of-direct-costs (apply X% based on total direct costs) is simple and works when overhead scales with project size. Percentage-of-labor (apply X% based on direct labor) works when overhead correlates with labor. Dollars-per-direct-labor-hour expresses similar logic differently. Activity-based costing (allocating specific overhead categories based on specific cost drivers) is most accurate but most complex. Most operations find percentage-of-direct-costs or percentage-of-labor produces reasonable allocation without excessive complexity.
What if my burden calculation produces a number that seems too high or too low?
Investigate before adjusting. Numbers that seem too high may reflect actual reality (higher workers' comp than expected, richer benefits than estimated, etc.). Numbers that seem too low may reflect missing components (forgot to include workers' comp, didn't include retirement contributions, etc.). Compare your calculation to industry benchmarks for similar operations as a sanity check. If your burden is significantly different from typical operations, dig into why: it may be legitimate operational difference, or it may indicate calculation errors that need correction. Use the variance from typical as investigation prompt rather than as automatic indicator your calculation is wrong.