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May 9, 2026 — A deeply watched gauge of the U.S. services sector has slipped below its previous reading, signaling that tariffs and diesel-fuel costs are beginning to curb order volumes. ISM's services purchasing managers' index fell to 54.9% from 55.45% in August, while the survey's prices index reached its highest mark in four years. The sector remains in growth territory, but the price surge is the detail worth watching.
Services are the main engine of U.S. growth, generating roughly three-quarters of GDP expansion, according to Commerce Department data. That makes the ISM services index more consequential than its manufacturing counterpart in terms of the overall business cycle. The sector has absorbed several shocks over the past year, including tariffs, U.S.-Iran tensions and higher borrowing costs. Despite those headwinds, it has kept growing.
One reason for that resilience is visible in the national accounts. The Commerce Department revised second-quarter growth up to 2.2% at an annual rate, a 0.7 percentage point increase from its earlier estimate. For the third quarter, the Atlanta Fed's GDPNow model was projecting a 3.7% annualized rate. Those numbers do not describe an economy in danger of stalling.
The ISM survey committee made the cause of the slowdown clear. "Tariffs and fuel cost impacts were the most cited issues impacting respondents' supply chains," Steve Miller, chair of the services business survey committee, said in a statement. "Fuel costs were mentioned twice as often as any other single issue impacting performance," he added.
Tariffs add an ad hoc tax on imported materials, while diesel acts like a tax on distance. For companies with thin margins, the combination forces tough choices about where to absorb costs and where to raise prices.
Diesel plays an outsized role in the ISM services data. AAA puts the national average retail price at $6.32 per gallon, a 70% jump over the previous year. Freight carriers, construction crews, retailers and wholesalers all face that cost increase quickly. When fuel is a large share of operating expenses, surcharges are often passed on within weeks.
Pantheon Macroeconomics chief U.S. economist Samuel Tombs made a related point after the ISM release. He said the four-year high in the ISM prices index likely reflected another increase in motor fuel prices, especially diesel. He also noted that the survey's panel is weighted toward sectors with direct exposure to energy price shocks: construction, transportation, retail and wholesale.
Government inflation data released around the same time told a similar story. The personal consumption expenditures price index rose 0.3% in August from July and was up 3.4% on a year-over-year basis. The core PCE index, which excludes volatile food and energy prices, increased 0.2% from July and 3.0% from a year earlier.
Core inflation at 3% means the Federal Reserve is still well above its 2% target, even after stripping out direct energy costs. That detail matters because it suggests the tariff and fuel shocks are starting to filter into a wider range of service-sector prices.
ISM respondents put specific names on those price pressures. One respondent said diesel costs had raised freight expenses dramatically. Another noted that farmers are particularly vulnerable because harvest season depends heavily on diesel fuel. The same respondent pointed out that expensive crude oil had driven nitrogen prices, a key farm input, to near-record levels.
Those comments show how an energy spike travels through the chain. Higher crude oil lifts fuel prices and fertilizer prices at the same time. Higher freight rates lift store-delivery costs. Eventually, consumers see the result on invoices from groceries to clothing.
Another way to interpret the ISM numbers is as a warning about margins. A four-year high in input prices alongside softer new orders creates a squeeze. Companies that once passed higher costs through without losing customers may now see more resistance. If shipments slow, the pricing power that services firms enjoyed in the past year could fade quickly.
That is why the prices index, rather than the headline PMI, may be the most important line in this report. The headline still points to expansion, but the price gauge tells a sharper story about how much economic friction is building under the surface.
The pricing signal is also a policy signal. At the time of the ISM report, the U.S. economy was growing at an estimated 3.7% in the third quarter, according to the Atlanta Fed. Services prices were rising at the fastest pace in four years. For the Federal Reserve, that combination reduces the room to cut interest rates even if trade tensions and fuel costs weaken business sentiment.
Financial markets were still absorbing the message that service-sector inflation is not just a transitory story. If the ISM prices index keeps climbing, the Fed's calculus becomes harder. If it falls back, the case for easing will strengthen.
The ISM report offers several signals worth monitoring. First, the new orders component moved lower, so future readings will show whether that is a blip or a broader slowdown. Second, the prices index is at a four-year high, meaning any drop in crude oil or diesel prices should appear there quickly. Third, the committee's comments on tariffs will shift if trade policy changes.
As of May 9, 2026, the key test is whether the next ISM services releases confirm or reverse the pattern seen here. If new orders keep falling while prices stay high, the U.S. growth story will start to lose some of its shine. If freight costs and service prices ease, this report may be remembered as a warning, not a turning point.
The U.S. services sector is not shrinking, but it is no longer coasting. Tariffs and diesel costs are creating a persistent drag on new orders and a sharp lift in prices. With services driving most of the country's GDP growth, the direction of the ISM services index is a crucial tell. The latest report is a reminder that inflation can still come from the supply side, and that the price of fuel affects far more than the pump.
