What You Need to Know About Per Diem Construction Jobs

If you’ve ever managed per diem construction jobs — or hired crews who travel for work — you already know it can get complicated fast.

Whether you’re a contractor in the field or a project manager running payroll, the rules around per diem catch a lot of people off guard.

What counts as per diem? How do you calculate it? Is it taxable? Do you track it separately from regular wages?

These are real questions that trip up contractors every year. Get it wrong, and you’re looking at payroll headaches and compliance problems that cost you time and money.

Get clear on the basics now, and you’ll save yourself serious headaches, costly mistakes and compliance problems.

What “Per Diem” Actually Means on a Construction Job

Per diem is a daily allowance you pay workers to cover out-of-pocket costs when they travel away from home for a project. Think hotels, meals and other incidentals.

Instead of chasing down receipts, you pay a set amount per day. This is simple in theory, but trickier in practice.

In construction, this comes up all the time. Projects send crews hours from home base for weeks or months at a stretch. Covering their daily expenses keeps your workforce on-site and focused on the job.

Daily Allowances vs. Regular Wages

It’s easy to confuse daily travel allowances with regular wages — but the IRS sees them very differently.

Wages pay workers for their time. Per diem covers the costs that come with working away from home. Think of things like lodging, meals and incidentals tied to overnight travel — not everyday expenses like commuting to a local jobsite or grabbing lunch down the street.

This distinction matters because per diem, when paid correctly, is not subject to federal income tax or payroll taxes.

The catch? Being paid “correctly” has a specific definition — and the IRS is particular about it.

Pay more than the IRS standard rate, and the extra amount becomes taxable income. Skip tracking it separately from wages, and you’re setting yourself up for compliance problems when it’s time to file. We’ll cover the current IRS rates below.

Per Diem Rates for Construction Workers

The IRS publishes standard per diem rates each year. GSA per diem rates run on the federal fiscal year — October 1 through September 30 — not the calendar year, so a rate that’s current in September may not be current in October. For FY2026 (October 1, 2025 through September 30, 2026), the standard CONUS rate is $178 per day, split between $110 for lodging and $68 for meals and incidentals.

High-cost cities and regions are designated “non-standard areas” (NSAs) and carry their own higher rates, which you can look up using the GSA’s per diem lookup tool. Rates are updated annually, so it’s worth checking each fiscal year before you set your policy.

You can use the IRS standard rates or set your own. If you go above the IRS rate, the difference gets treated as taxable income. Contractors managing crews across many locations sometimes use the IRS high-low method instead — two flat rates (one for designated high-cost localities, one for everywhere else) rather than looking up each city individually.

Most contractors stick to the standard rates to keep things compliant.

Does a Daily Stipend Count Toward Overtime?

No — and this is a big one. A worker’s daily travel allowance does not factor into overtime pay calculations. Overtime comes from the regular rate of wages, not the expense allowance.

Lumping per diem into wages is a common mistake. It skews your overtime calculations and can trigger compliance issues that can mean back taxes, penalties and hours of cleanup work.

How to Track Per Diem Separately from Wages

To stay compliant, per diem needs to be completely separate from wages in your payroll records. That means:

• Recording it as a distinct line item
• Documenting the business purpose and destination for each trip
• Making sure your payroll software isn’t bundling it into the regular wage calculation

Many contractors also use an accountable plan — an IRS-recognized reimbursement structure that keeps per diem non-taxable as long as expenses are documented and any excess is returned.

Most payroll providers support this structure, so it’s worth asking yours if it isn’t already set up.

Finally, hold onto your per diem documentation for at least three years. If you’re ever audited, that paper trail is what keeps a routine review from turning into a costly problem.

Tracking Construction Travel Pay Across Multiple Jobs

Here’s where it really gets tricky. Run multiple projects across different cities and states, and you’re juggling different allowance rates, different tax rules and different reporting requirements.

Tracking all of this manually is a recipe for errors. Most off-the-shelf payroll software was not built with construction in mind, so you end up doing a lot of workarounds — and workarounds create risk.

Does Your Per Diem Policy Change From State to State?

Not necessarily — but it can. Your company can set a single, consistent per diem rate across all states, and many contractors do exactly that to keep things simple.

Where it gets complicated is when IRS standard rates vary by location. If you’re paying a flat company rate that exceeds the IRS standard for a given area, the overage becomes taxable income for that worker in that state.

Some states also have their own income tax rules that affect how per diem is reported, even if the federal treatment stays the same. The safest approach is to run your policy by a payroll specialist familiar with construction and multi-state work before locking in a rate.

Union Crews and Prevailing Wage Work

Multi-state complexity is one thing. Union crews and prevailing wage work introduce an entirely separate set of rules — and the two don’t always play nicely together in the same payroll run.

Union agreements often dictate specific per diem amounts, which may differ from both your company policy and the IRS standard rate for a given area. On top of that, prevailing wage jobs come with their own certified payroll reporting requirements — typically filed on federal Form WH-347 or a state equivalent — that have to be met separately from your standard payroll process.

Failing a certified payroll audit or misreporting a union worker’s allowance can result in back pay obligations, contract penalties or disqualification from future public work.

 Getting these wrong doesn’t just create internal headaches — it can put you out of compliance on a job.

Why Construction-Specific Payroll Software Makes a Difference

Multi-state tax rules, union agreements, prevailing wage reporting — each one is manageable on its own. Together, they create the kind of layered complexity that generic payroll software simply wasn’t built to handle.

That’s why more contractors are turning to construction-specific payroll solutions that handle certified payroll, prevailing wage and multi-state compliance in one place.

Look for software that:

• Automates certified payroll reports
• Flags when company rates exceed IRS thresholds by location
• Keeps union and non-union crews on separate workflows without extra manual steps

The right software does the calculating, the tracking and the reporting for you — so you’re not piecing it together across spreadsheets and workarounds.

Simplify Per Diem on Every Construction Job

Per diem sounds simple enough — pay workers for their travel costs, keep it separate from wages, stay under the IRS rate. But when you’re running crews across multiple jobs and states, the details add up fast.

The good news is that most per diem problems come down to the same root causes:

• Unclear policies
• Inconsistent tracking
• Payroll systems that weren’t built for construction

A clear policy means putting your per diem rules in writing before a project starts — rates, eligible expenses and how overages are handled. Consistent tracking means per diem lives in its own line item, every time, in every pay run.

 And the right payroll system means one that handles construction’s complexity without requiring workarounds.

Of course, having the right tools makes all three easier to manage. If your current setup is making that harder than it needs to be, it may be worth looking at a solution built specifically for construction.

Payroll4Construction handles the complexity that comes with running construction payroll — so your team spends less time in the back office and more time on the jobsite.

Ready to see it in action? Book a demo and talk with an expert today.