What Is Per Diem for Construction Workers?

Workyard research shows why per diem becomes a payroll problem quickly. Contractors described separate per diem codes, different rates by worker or job, and cases where per diem was owed on a day with no time card.

Those cases also included per diem alongside multi-rate pay and travel bonuses, which makes clean payroll coding and job attribution more important.

That’s because per diem only looks simple. It is a travel-expense arrangement, not a flat bonus, and its tax and wage treatment hinges on a worker’s tax home, how long the assignment runs, how well it is documented, and which wage rules apply on that job.

Get any one of those wrong, and per diem turns into an unplanned tax bill for the worker, an overtime miscalculation, or a compliance gap on a Davis-Bacon job.

As part of broader construction expense management, here’s how per diem for construction workers and construction worker per diem actually work, what makes the payment tax-free, and where it collides with overtime, mileage, and prevailing-wage rules.

What per diem is, and how contractors handle it in payroll

Per diem for construction workers commonly applies to traveling superintendents, project managers, inspectors, technicians, welders, and electricians assigned to a distant or temporary jobsite.

It is separate from hourly wages, salary, overtime, and mileage reimbursement, split into lodging reimbursement and meals and incidental expenses (M&IE). Construction worker per diem eligibility normally comes from an employer’s policy, a union contract, or state law.

Paying it does not automatically make it tax-free. The worker must be traveling away from their tax home, and the assignment generally must qualify as temporary under IRS rules.

Under an accountable-plan arrangement, a contractor may record per diem separately from hourly wages, overtime, and mileage on the same paycheck.

For a field worker who splits an assignment across more than one job site, that means coding per diem to the out-of-town job itself, while paying travel time and mileage separately for the days spent moving between sites.

For example, an employer using the federal per diem method may use the full applicable daily rate for qualifying full travel days. The federal method uses 75 percent of the M&IE rate for the first and last travel days.

When is per diem construction pay tax-free?

An employer can generally treat per diem as a reimbursement rather than taxable wages when it’s paid under an IRS accountable plan. Three conditions have to be met:

• The expense has a genuine business connection to the worker’s travel.
• The worker substantiates the trip’s dates, location, and business purpose within a reasonable period.
• The worker returns any amount paid above the substantiated or permitted allowance.

Using the federal per diem method can remove the need to document every individual meal, but it does not remove the requirement to document the trip itself.

Amounts that fail the accountable-plan rules are treated under a nonaccountable plan. Depending on the failure, the taxable amount may be the unsupported or excess portion rather than the entire payment.

IRS Publication 463 covers these accountable-plan rules and other travel expenses in detail for any worker away from their tax home.

How an accountable plan determines whether construction per diem is tax-free or treated as taxable wages.

The temporary-assignment rule

Tax treatment turns heavily on whether an assignment is temporary. An assignment realistically expected to last one year or less may qualify as temporary.

One expected to run longer than a year is generally treated as indefinite, and that temporary location status can flip mid-project if expectations change, shifting the tax treatment from that point forward.

“More than 50 miles from home” is not a universal IRS test. The key tax question is whether the worker is traveling away from their tax home long enough to require sleep or rest, along with the temporary-assignment rules.

A worker without a regular place of business may be considered itinerant, and travel allowances paid to an itinerant worker are generally taxable.

Per diem construction pay and overtime

Tax treatment and overtime treatment use different rules. Under the FLSA, a reimbursement can generally be excluded from the regular rate when it covers actual or reasonably approximate business travel expenses.

A disproportionately large payment, or an amount that is really compensation for hours worked, can lose that exclusion. The excess or wage-like portion may need to be included in the regular rate.

An employer also cannot cut a worker’s hourly rate and relabel the difference as per diem to reduce overtime obligations. Calling a payment “per diem” does not convert ordinary wages into a reimbursement.

Keeping per diem visibly separate from hourly pay, overtime, and mileage is a job-costing problem as much as a compliance one.

Workyard is the construction operations platform for specialty contractors and self-performing general contractors determined to grow without sacrificing job control or margins.

Workyard can keep GPS-verified labor hours tied to the correct jobs and cost codes. Per diem itself currently needs to be handled separately in the contractor’s payroll or expense workflow.

Per diem on prevailing-wage and Davis-Bacon jobs

Per diem should not automatically be counted as wages or as a bona fide fringe benefit toward a Davis-Bacon prevailing-wage obligation.

Davis-Bacon per diem and prevailing wage per diem treatment are often confused, but both follow business-expense rules, not the wage-and-fringe rules that govern the base hourly rate.

The Department of Labor treats per diem as an ordinary business-expense reimbursement, separate from the base prevailing wage, health and retirement contributions, vacation or holiday benefits, apprenticeship costs, and other qualifying fringe benefits.

Contractors on federally funded or assisted projects need to evaluate a travel allowance on its own terms rather than folding it into the fringe-benefit side of the wage determination.

The Department of Labor lists improperly taking fringe-benefit credit for travel, per diem, and lodging expenses among common Davis-Bacon compliance problems.

Current federal per diem construction rates for 2026

The FY2026 standard federal per diem construction rate is $178 a day, combining lodging reimbursement and meals and incidental expenses, and it applies to most U.S. counties by default. The table below breaks out both components.

Component	Standard FY2026 rate
Lodging	$110 per night
Meals and incidental expenses	$68 per day
Combined standard benchmark	$178 per day

These are the GSA’s FY2026 standard CONUS rates, in effect from October 1, 2025 through September 30, 2026.

Location-specific per diem rates 2026 run higher in costlier counties, with M&IE tiers reaching $92 a day, and GSA bases the rate on where the work happens, not where a worker chooses to stay.

These are federal travel reimbursement rates for federal employees. Private construction employers can use federal per diem rates for tax substantiation, but the GSA rate is not a general minimum per diem that private employers must pay.

State laws, union agreements, and H-2B rules

States are not required to follow the federal per diem construction rate for 2026. It is a federal tax benchmark for private employers, not a state mandate.

Public-works and prevailing-wage jobs are the main exception, since a state can set its own travel-and-subsistence figure that governs the job regardless of the GSA number that year.

California publishes craft- and locality-specific travel and subsistence provisions alongside prevailing-wage determinations. There is no single statewide travel-per-diem amount.

The applicable amount can vary by craft, locality, and determination. Contractors should check the current DIR determination and travel or subsistence provision for the work being performed.

Collective bargaining agreements often set their own daily or weekly rates, mileage thresholds, travel zones, and rules for employer-provided lodging.

A national per diem policy should be checked against the law where each worker actually performs the work, not only where the company is headquartered.

Compensable travel time between job sites and mileage reimbursement, calculated using the standard mileage rate, follow their own separate rules and should not be folded into a per diem policy.

H-2B employers can carry separate obligations for inbound and outbound transportation costs and daily subsistence payments specific to the visa program. These rules are distinct from a company’s ordinary, voluntary per diem policy and should not be assumed to apply the same way.