The Internal Revenue Service has increased the 2026 standard business mileage rate from 72.5 cents to 76 cents per mile, effective July 1.

Fuel-price volatility drove the 3.5-cent increase, according to Motus, which supplies vehicle-cost data used to support the IRS calculation. The 4.8% adjustment is only the fifth mid-year change since 2000. Previous adjustments occurred in 2005, 2008, 2011, and 2022, during periods of substantial fuel price disruption.

“Employees who drive for work feel the effects of changing fuel prices every time they fill up their tank,” said Phong Nguyen, CEO of Motus. “A midyear rate adjustment recognizes the changing costs that organizations and employees are facing.”

The IRS rate incorporates both fixed and variable vehicle costs. However, fuel is especially likely to force an off-cycle adjustment because its price can change quickly enough to render a rate established at the beginning of the year outdated.

Other expenses, including insurance, maintenance, financing, and depreciation, typically move more gradually—and not necessarily in the same direction.

“Operating costs haven’t necessarily become more volatile, but they have become more complex,” said Alan Wisniewski, director of fleet and partnerships at Cardata. “Different cost categories are moving independently of one another.”

What the New Rate Means for Fleets

The new rate does not require employers to reimburse drivers at 76 cents per mile. However, organizations that use the IRS rate as a reimbursement benchmark will need to decide whether to adopt it for mileage accumulated beginning July 1.

The unusual adjustment also provides an occasion to review whether a national cents-per-mile rate remains appropriate for different driver populations. Alternatives include fixed and variable rate programs, accountable allowances, and company-provided vehicles.

“The IRS standard mileage rate is a useful benchmark, but it’s a national average that doesn’t reflect every driver’s circumstance,” Wisniewski said.

Nguyen similarly cautioned against treating the increase solely as an arithmetic change. “The question isn’t simply, ‘Should we reimburse more?’ It’s, ‘Are we reimbursing the right way?’” he said.

For fleets, the immediate change is an additional 3.5 cents per business mile. The broader significance is that fuel costs moved far enough and fast enough to make the original 2026 benchmark obsolete after six months.