When Employees Drive EVs: How Mileage Reimbursement Programs Are Failing Electric Vehicle Drivers

For years, I’ve examined the mechanics of corporate expense management, looking at the logic—or lack thereof—behind how companies track and reimburse employee spending. My focus is on the realities of finance operations, the friction points, and the silent frustrations of the workforce. Lately, a new fault line has emerged: the electric vehicle. As more employees buy EVs, I’ve watched traditional mileage reimbursement programs, built for a gasoline-powered world, buckle under the weight.

The Flawed Foundation: IRS Standard Mileage Rate and EVs

The IRS standard mileage rate, currently sitting at 67 cents per mile for 2024, is a blunt instrument. It exists to cover the average costs of operating a vehicle for business, encompassing fuel, maintenance, insurance, and depreciation. For decades, this served its purpose reasonably well for internal combustion engine (ICE) vehicles. The underlying assumption was a predictable fuel cost per mile, easily calculated and universally understood. Electric vehicles operate on a different economic model, and the standard rate fails them.

I speak to finance managers every week who apply the standard rate across the board, regardless of vehicle type. "It's what the IRS says," they tell me, shrugging. "Keeps it simple." That simplicity works for the accounting department, but it punishes the EV driver. EV costs are front-loaded with a higher purchase price, while their operational costs for fuel drop. This fundamental misalignment leaves EV drivers either over- or under-compensated—usually the latter.

The Electric Cost Conundrum: Charging, Depreciation, and Maintenance

An ICE vehicle fills up at a gas station—a uniform experience. An EV might charge at home, at a public Level 2 charger, or at a DC fast charger. The cost per kilowatt-hour (kWh) varies wildly. Home charging overnight is cheap, especially on a time-of-use electricity plan. Public Level 2 chargers cost more. DC fast chargers, necessary for long trips, can be exorbitant, sometimes exceeding the cost of gasoline for the equivalent range. A flat per-mile rate cannot account for this variability. I watch employees track their charging sessions to justify a higher reimbursement, only to get blank stares from expense approvers trained to look for gallons instead of kWh.

Then there is battery degradation. EVs generally have lower routine maintenance costs—no oil changes, fewer moving parts—but battery health dictates their long-term value. The IRS rate fails to factor in battery degradation in a way that reflects the unique wear and tear of an EV used for business. Brake wear drops due to regenerative braking, but tire wear increases due to instant torque and heavier vehicle weight. These nuances are completely lost in a one-size-fits-all approach.