Why Your Labor Costs Are Probably Wrong (And What It’s Costing You on Every Job)

The Gap Between What You Pay and What You Actually Pay

Most subcontractors know what they pay their workers per hour. Far fewer know what those workers actually cost per hour once payroll taxes, insurance, benefits, paid time off, and other burden costs are included.

That is the labor burden rate construction subcontractors cannot afford to treat like a rough guess. If you pay an electrician $45/hour in wages, the true fully burdened labor cost may land closer to $62–$70/hour. That is not a small difference. It is a 38–56% gap running on every labor hour, across every job, whether your estimate sees it or not.

This is why labor tracking keeps showing up as a profitability problem. In an April 2026 survey of 300 subcontractors, 26% cited labor tracking as a key barrier to understanding job profitability. Only 49% said they were very confident their estimates reflect true job costs and margins.

Those two findings are connected. If your estimate uses wage rate instead of fully burdened labor cost, the job may look profitable before it ever has a chance to be accurate.

This article is about that gap: what burden includes, how the math works, where estimates break down, and why updating your burden rate every year matters.

What Burden Actually Is: The Full List

Labor burden is everything your company pays for an employee beyond the hourly wage. It does not always show up on the paycheck, but it still belongs in the job cost. You see it in payroll tax filings, insurance invoices, benefits administration, paid nonproductive time, training costs, and other employment-related expenses.

In plain English: if an employee costs the business money because they are on payroll, that cost belongs somewhere in the fully burdened labor rate.

The table below gives a practical reference point. These are illustrative ranges, not universal rates. Every contractor’s burden rate is different based on trade, state, union status, claims history, workforce mix, and benefits package.

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Workers’ comp is usually the biggest swing factor. It varies by trade classification, state, and claims history. An electrical contractor may see a much different rate than a concrete, roofing, or framing contractor. Using the wrong workers’ comp assumption in an estimate is one of the fastest ways to create a false labor cost.

Overtime is another place where estimates get too optimistic. Overtime is not just 1.5x the base wage in practical job-cost terms. Fully burdened overtime can run closer to 1.6–1.7x the regular fully burdened rate because some burden costs rise with premium time.

That detail matters on commercial jobs with compressed schedules. Perfect straight-time assumptions are nice. Jobs do not always behave that politely.

The Math: What an Underestimated Burden Rate Costs on a Real Job

Here is where the problem gets expensive.

Say a commercial HVAC contractor estimates a $400,000 mechanical installation. Labor is expected to represent 28% of the job, or $112,000. The estimator uses a 22% burden rate because that has been the default in the spreadsheet for years.

But the actual current burden rate, recalculated with updated workers’ compensation premiums, health insurance costs, unemployment rates, and payroll taxes, is 31%.

That is a 9-point miss.

The math is simple: $112,000 x 9% = $10,080 in underestimated labor cost.

If the job was expected to produce $28,000–$32,000 in net profit, or roughly 7–8%, that one stale burden assumption erases about a third of the expected profit. The estimating math was not wrong. The input was stale.

Now scale that across a year.

If a specialty contractor runs $3 million in annual revenue and labor accounts for 28% of cost, that is $840,000 in direct labor annually. A 9% burden underestimate equals $75,600 in margin the company expected but never actually kept.

That number is not theoretical. It shows up as the difference between a strong year and a mediocre one. It shows up in cash flow. It shows up when the owner wonders why the company stayed busy but profit still felt thin.

Insurance alone can move the number. If insurance represents 4–5% of revenue and premiums rise 12%, that can consume another 0.5–0.6% of revenue. On $2 million in annual revenue, that is $10,000–$12,000 in reduced profit from one cost category change, before the estimator even knows the old rate is wrong.

That is the point: labor burden is not a set-it-and-forget-it number. It is a live input tied to real costs.

Where Burden Rates Break Down in Practice

Labor burden gets miscalculated for three common reasons.

The first is stale rates. Burden changes every year. Workers’ comp renews. Health insurance changes. State unemployment rates move based on claims history. Benefits costs rise. Tool allowances, training contributions, per diem policies, and payroll tax assumptions shift.

But many estimating databases and spreadsheets do not change with them. Someone updates the burden rate once, then the number survives for years because nobody wants to reopen the model. That is understandable. It is also expensive.

The second issue is mixed workforces. Most specialty subcontractors do not use one clean labor category. They may have W-2 employees, union workers, open-shop crews, temporary labor, and hourly subcontractors. Each carries a different cost structure.

A W-2 electrician at $45/hour carries full employer burden. A 1099 subcontractor at $65/hour may carry no employer payroll burden because their rate is the total cost to the firm. Temporary labor may include agency markup but not the same insurance or benefit structure. Blending all of that into one average without separating the categories creates systematic miscalculation.

The third issue is overtime. Estimates often assume straight-time hours because that is the cleanest way to build the bid. Then the job hits reality: tight sequencing, delayed access, weekend work, late material delivery, or a GC pushing to recover schedule.

If 10–15% of hours shift into overtime and the estimate only carried straight-time burden, the job starts leaking margin fast. The issue is not just the premium wage. It is the full loaded cost of that premium time.

This is becoming harder to ignore. Bridgit’s 2025 labor-cost analysis put field craft wages at an average of $36.54/hour, up 4% year over year and about 18% above typical private-sector wages. In the 2026 construction outlook, 56% of firms cited rising direct labor costs, including pay, benefits, and employer taxes, as a major concern. Another 57% cited insufficient worker supply or subcontractor availability as a major challenge.

That labor pressure pushes wage rates up, makes overtime more likely, and makes burden-rate accuracy more important. The firms that handle this best are not guessing from old spreadsheets. They are using current insurance quotes, current benefits costs, current payroll tax assumptions, and current workforce mix.

That is not glamorous work. It is just the kind that protects margin.

Closing: Recalculate Every Year

Your burden rate is not a permanent number. It changes every time insurance renews, benefits shift, payroll taxes change, unemployment rates move, or your workforce mix changes.

Treating it as stable while the underlying costs are moving is one of the quietest margin leaks in a specialty trade business.

The fix is not complicated. Pull the actual cost components at the start of each estimating year. Run the calculation. Separate W-2 labor, temporary labor, union labor, and subcontracted labor where needed. Update the rate before the first serious estimate of the year goes out.

The math is not the hard part. The discipline is.

For the broader picture of how commercial specialty contractors track and protect project-level profitability, read Profitability at the Project Level: Job Costing for Subcontractors. For a related margin leak after award, read The Change Order Problem: Why Subcontractors Are Leaving Money on the Table After the Bid Is Won.