Estimating

What is a burden rate in construction?

A burden rate is a percentage applied on top of a base cost to recover the costs that ride along with it. For labor, it covers payroll taxes, insurance, and benefits; for overhead, it spreads indirect costs over direct costs or hours.

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Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

A burden rate turns a base number into a full one. The most common use is labor: if a carpenter earns $32 an hour, the company's real cost is higher once payroll taxes, workers' comp, liability insurance, and benefits are added. The burden rate expresses those extras as a percentage of wages, so an estimator can multiply instead of rebuilding the math on every bid.

Contractors also use burden rates for overhead. An overhead burden rate spreads indirect costs (office rent, estimators, software, vehicles) across direct labor hours, direct labor dollars, or total direct cost, so each job carries its share. The full breakdown of labor costs is covered in the labor burden entry. This page is about the rate itself: how to build it and how to apply it.

Building a labor burden rate

Some pieces are set by federal law. Per the IRS, the employer's Social Security tax is 6.2 percent of wages up to the annual wage base ($184,500 for 2026) and Medicare is 1.45 percent with no wage base limit. FUTA is 6.0 percent on the first $7,000 of each employee's wages, with a credit of up to 5.4 percent for state unemployment tax paid, so many employers pay a net 0.6 percent. The rest depends on your state unemployment rate, your workers' compensation class codes and experience mod, your general liability rating basis, and the benefits you provide.

Example labor burden rate for one carpenter class (illustrative only)
ComponentRate of base wagesSource of the rate
Social Security6.2%Federal (IRS)
Medicare1.45%Federal (IRS)
FUTA, net of full credit0.6% on first $7,000Federal (IRS)
State unemploymentYour assigned rateState agency notice
Workers' compYour carrier rate for the class codePolicy
General liability on payrollYour rating basisPolicy
Health, retirement, PTOYour actual cost spread over hours workedCompany

Add the components to get the burden percentage for that class. Rates differ by trade because workers' comp rates differ a lot. A roofer's comp rate is usually far higher than an office worker's, so one company-wide burden rate can badly underprice risky trades.

Applying the rate: an example

Say your carpenter burden comes out to 38 percent (a made-up figure for this example). An estimate has 640 carpenter hours at $32.00. Base labor is $20,480. Burden is $20,480 times 0.38, or $7,782.40. Burdened labor is $28,262.40, which is the number that belongs in the estimate and in job costing.

Watch the caps. Social Security and FUTA stop at their wage bases, so the effective rate for a high earner drops later in the year. Many contractors use an annual average rather than the January rate, which overstates burden late in the year.

Common mistakes

  1. Using one burden rate for every trade and the office.
  2. Forgetting that paid time off and holidays are paid on hours that are not billable.
  3. Calculating burden on hours paid instead of hours actually worked on jobs.
  4. Not updating the rate when insurance renews or state unemployment rates change.
  5. Mixing up labor burden with overhead burden. They recover different costs and should be tracked separately.

Related terms

See payroll burden, overhead, labor rate, hourly rate, and indirect costs. For step by step math, read how to calculate labor burden for construction workers and how to calculate construction overhead rate. Smart Business Automator applies job costs by cost code so burdened labor shows up in job cost and WIP views. See job costing and WIP automation.

Frequently asked questions

What is a typical burden rate in construction?

It varies widely by trade, state, insurance, and benefits. Build your own from your payroll taxes, insurance rates, and benefit costs rather than using a rule of thumb.

What is the difference between labor burden and burden rate?

Labor burden is the dollar amount of costs added to wages. The burden rate expresses that amount as a percentage of wages (or another base) so it can be applied in estimates and job costing.

Should overhead be included in the burden rate?

Keep them separate. Labor burden covers costs tied to each hour of payroll. Overhead burden covers company indirect costs and is usually recovered through a separate rate or markup.

What payroll tax rates go into the burden rate?

Federal rates per the IRS are 6.2 percent Social Security up to the wage base, 1.45 percent Medicare, and FUTA of 6.0 percent on the first $7,000 with up to a 5.4 percent credit. State unemployment and any state or local payroll taxes are added on top.

Sources

  1. IRS: Topic no. 751, Social Security and Medicare withholding rates
  2. IRS: Topic no. 759, Form 940, Employer's Annual Federal Unemployment (FUTA) Tax Return
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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