Tariff Costs Are Coming for Your Construction EMR
AGC data shows construction input costs up 6.6% while bid prices lag at 3.6%. The margin squeeze doesn't just hit the P&L. It shows up in your claims, then in your mod.
Tariff-driven material costs are rising nearly twice as fast as bid prices in construction (AGC / BLS, May 2026). The margin squeeze pushes contractors to cut safety spending, extend overtime, and use less experienced crews, all of which are empirically linked to higher claim frequency. Claim frequency directly inflates the Experience Modification Rate (EMR) over its rolling three-year window.
Tariff-driven construction input costs rose 6.6% year-over-year through April 2026 (AGC / BLS, May 2026). Bid prices rose 3.6%. That three-point gap is the widest in years, and it isn't just a P&L problem.
It's a workers' comp problem. When margins compress, something gives. Usually it's the line items that don't show up in a bid: safety staffing, equipment maintenance, overtime limits, crew experience. Those are the same line items that drive claim frequency. And claim frequency is half the math behind your Experience Modification Rate (EMR).
How tariff costs squeeze construction margins
Numbers first. The producer price index for inputs to new nonresidential construction jumped 6.6% from April 2025 to April 2026 (AGC / BLS, May 2026). Aluminum mill shapes led the metals category at +37.3% year-over-year. Copper and brass mill shapes climbed 20.9%. Steel mill products rose 13.3%. Diesel fuel, which touches every delivery and every piece of heavy equipment on a jobsite, surged 73.8%.
The PPI for new nonresidential building construction, tracking what contractors can actually charge, rose just 3.6% over the same period. Contractors are absorbing the difference. In the Southeast, metals alone now add an estimated 3% to 5% to total project costs, often exceeding the profit margin on a fixed-price contract (ABC Carolinas, 2026).
That's the squeeze. It isn't theoretical.
Where the money comes from when margins disappear
A contractor looking at a 2% margin doesn't cut rebar. The material is in the bid. What gets cut is the overhead that isn't: safety directors stretched across more projects, older equipment running another season without replacement, overtime hours climbing because adding a crew costs more than burning the one you have.
Travelers' 2026 Injury Impact Report analyzed 1.2 million workers' comp claims from 2021 through 2025 and found that construction workers average 114 lost workdays per injury, the highest of any industry (Travelers, May 2026). First-year employees drove 44% of construction injuries and 47% of construction claim costs. When a contractor fills a crew with less experienced labor to hold the bid, the data shows what happens next.
The connection to the EMR is direct. More claims in your experience period mean a higher actual-to-expected loss ratio. One additional lost-time claim on a $4M payroll can move the mod 5 to 10 points. That's roughly $15,000 to $30,000 in added premium over three years, compounding the financial pressure that caused the cut in the first place.
The frequency plateau that makes this worse
NCCI (the National Council on Compensation Insurance) reported that construction lost-time claim frequency dropped roughly 40% from 2015 through 2023, the sharpest decline of any industry (NCCI AIS, 2024). That trend drove a decade of favorable mod results for contractors who simply stayed the course.
The decline has flattened. Lost-time frequency fell just 2% in the most recent measurement year, well below the long-term average pace (NCCI, May 2026). Medical severity rose 4% in the same period. When frequency stops falling and severity keeps rising, the mod formula has no favorable current to swim in. Every new claim lands harder.
Tariff-driven margin pressure arrives at exactly the wrong moment in that curve. Even a modest frequency uptick could reverse years of gains for contractors who were riding an industry-wide tailwind they didn't create.
What Southeast contractors should watch
The Southeast amplifies this dynamic. Charlotte, Raleigh, and the I-85 corridor are running near capacity for construction labor. When demand is high and margins are thin, the temptation to cut corners on crew quality and safety investment is strongest. These are NCCI-administered states where the mod formula applies with full weight.
In our reviews of Southeast contractor worksheets, the pattern is consistent: the contractors most exposed aren't the ones with poor safety records today. They're the ones with clean records built during a period of declining frequency who haven't tested what happens when tariff costs eat the budget line where safety spending used to live.
What an audit would check
An audit would examine whether recent claims reflect current cost dynamics, whether reserves have drifted from actual medical severity trends, and whether classification codes still match the work being performed as project scopes shift under cost pressure. Margin-driven crew changes often produce payroll shifts that move work into different class codes without anyone updating the worksheet.
Send us your NCCI worksheet for a free review before your next renewal.