By Jack Biltis, eBacon

Ask most contractors where they’re most likely to get burned on a certified payroll audit, and they’ll usually point to the obvious things: misclassified labor, missing time records, an apprentice working outside their approved ratio. Those are real risks, no question. But there’s another one that doesn’t get talked about nearly enough, and it happens to be one of the most common findings in Department of Labor prevailing wage investigations: fringe benefit reporting.

Fringe benefits look simple on paper. Under the Davis-Bacon Act and related state prevailing wage laws, contractors on covered projects have to pay workers a base wage plus a fringe benefit rate. That fringe portion can be paid out in cash, credited toward a bona fide benefit plan, or split between the two. Simple enough in theory. In practice, this is exactly where a lot of contractors get tripped up, and they usually don’t find out until an auditor points it out to them.

Why Fringe Benefits Are Harder Than They Look

The fringe benefit rate isn’t something you calculate once and forget about. It has to be documented thoroughly, and if you’re crediting any part of it toward a benefit plan instead of paying it in cash, that plan has to actually qualify as “bona fide” under Department of Labor standards. In plain terms: the plan needs to provide a real, measurable benefit to the worker, and you need to be able to show exactly how those fringe dollars were calculated and applied.

Here’s where things typically go sideways:

Annualization errors. If a benefit plan covers a worker for both public and private work, you generally can’t take full credit for the plan cost against just the hours worked on the prevailing wage job. The plan cost needs to be annualized, meaning it gets spread across all the hours the plan covers, not only the covered project hours. Only the proportional share gets credited. Skip this step, or fumble the math, and you’ve got one of the most frequent audit findings out there.

Cash-in-lieu miscalculations. When fringe dollars get paid out in cash rather than credited toward a plan, that cash has to show up separately from the base wage on certified payroll reports. Contractors sometimes lump it into the base rate instead. That can make it look like they’re underpaying the fringe requirement even when they aren’t, or worse, it can mean they actually are underpaying because the math was never broken out correctly in the first place.

Plan documentation gaps. A legitimate benefit plan can still fail an audit if the paperwork doesn’t back it up. Auditors want to see plan documents, contribution records, and proof the plan runs the way it’s supposed to on paper. Good intentions without documentation still count as a finding.

Non-bona fide plans. Not every benefit arrangement actually qualifies. A plan that isn’t funded, doesn’t meaningfully cover the worker, or mostly exists as a piece of paper isn’t going to hold up. Contractors sometimes inherit plans like this from a broker or a Professional Employer Organization (PEO) without ever checking whether they meet the bona fide standard for prevailing wage purposes.

What Auditors Are Actually Looking For

When the Department of Labor or a state agency digs into fringe benefit compliance, they’re really checking three things. Is the fringe rate being paid or credited correctly for every hour worked? Is the plan, if one is being used, legitimate and properly annualized? And does the certified payroll report reflect all of that accurately, hour by hour, worker by worker?

The tricky part is that this isn’t a one-and-done calculation. Fringe rates can change by jurisdiction, by classification, and sometimes mid-project if a wage determination gets updated. A plan credit that was correct in January might need to be recalculated by summer if a worker’s hours or plan enrollment shifts. Multiply that across a crew, a project, or a whole portfolio of jobs, and it’s not hard to see why fringe benefit errors are so common. They’re also rarely caught until someone outside the company goes looking for them.

Why the Problem Gets Bigger With Scale

Fringe benefit compliance is manageable when you’ve got one crew, one plan, and one jurisdiction to keep track of. It gets a lot harder as the business grows. Contractors working prevailing wage jobs across multiple states might be juggling different wage determinations, different plan credit rules, and different documentation expectations, sometimes on overlapping projects running at the same time.

Throw in a mixed workforce of union and non-union labor, workers moving between covered and non-covered projects mid-year, or benefit plans changing because of a new insurance carrier or renewal cycle, and the math that seemed straightforward on one job can get inconsistent fast across a whole portfolio. This is usually where manual tracking breaks down: spreadsheets, standalone payroll systems that weren’t built for prevailing wage work, or fringe calculations that fall to whoever has time that week.

It’s also worth pointing out that fringe benefit errors rarely stay contained to themselves. An audit that starts by questioning fringe credits often opens the door to a broader look at classifications, apprentice ratios, and certified payroll reporting overall. Get fringe compliance wrong, and you’re not just risking a finding on that one line item. You’re inviting a closer look at everything else on the job too.

A Practical Checklist for Getting It Right

None of this requires an accounting degree to manage well, but it does take consistency. A few habits go a long way toward keeping fringe benefit reporting audit-ready:

• Document every plan in writing, including what it covers, how it’s funded, and how the cost translates into an hourly credit.
• Annualize plan costs correctly whenever a worker splits time between covered and non-covered work, rather than crediting the full plan cost against covered hours alone.
• Separate cash fringe from base wage on every certified payroll report. Never combine them into a single rate.
• Recalculate fringe credits whenever wage determinations, plan costs, or worker hours change, instead of assuming last quarter’s numbers still hold up.
• Keep a paper trail. Plan documents, contribution statements, and calculation worksheets should be organized and easy to pull up, not scattered across old email threads and spreadsheets.
• Review fringe compliance on a schedule, not just when a bid or audit forces the issue. A quarterly check is a reasonable cadence for most contractors doing regular prevailing wage work.

Treat Fringe Compliance as a System, Not a One-Time Task

The contractors who handle fringe benefits well tend to treat it the same way they treat safety or quality control: as an ongoing process with clear steps, not a box to check once a year. That shift in mindset, from “we calculated this correctly at the start of the job” to “we’re verifying this correctly every pay period,” is usually what separates a clean audit from a costly one.

Fringe benefit reporting isn’t the flashiest part of running a construction payroll operation, but it’s one of the areas where small mistakes quietly pile up until they turn into a big finding. Get it right, and you protect your workers, your bids, and your standing with the agencies overseeing prevailing wage work.

For contractors who want a quick way to check their fringe benefit credit math before it becomes an audit question, eBacon offers a free FringeMAX Calculator (https://ebacon.com/fringe-calculator) that walks through the annualization steps.

About the Author: 

Jack Biltis is the co-founder of eBacon, bringing over 20 years of experience in payroll, insurance, and administrative services. At eBacon, a leading construction payroll software company, Jack focuses on innovative technologies that help businesses streamline workforce management operations and improve profitability. Learn more at eBacon.com.