Beating the IRS Mileage Rate: Designing Cost-Efficient Vehicle Reimbursement Programs

If your employees drive as part of their work, you’re likely familiar with the IRS standard mileage rate, which is set and updated to reflect the national average cost of driving in the United States.

However, different companies and industries typically reimburse at different rates. This article explains why those differences exist, how various industries and company sizes determine their rates, and the potential savings a well-designed Fixed and Variable Rate (FAVR) program can deliver.

The IRS Benchmark vs. Real-World Practice

On a typically annual basis, the IRS sets an optional standard mileage rate designed to cover the total cost of operating a personal vehicle for business purposes, including expenses like fuel, maintenance, depreciation, insurance, registration, and even windshield wipers.

For 2025, that number is $0.70 per mile, but note that this rate changes on a somewhat regular basis. 

The standard mileage rate is also the amount per mile that businesses can reimburse employees at for eligible work travel, provided that certain requirements are met, which includes keeping detailed logs of business trips.

However, if companies pay more than the IRS standard mileage rate, the extra amount becomes taxable income unless it runs through an IRS-compliant FAVR program, which keeps it completely tax-free for both employers and employees. 

This is also dependent on the FAVR program following any IRS rules and regulations. Because that rate is a ceiling, not a floor, many companies choose to pay below it when budgets or hiring pressures allow.

Only a few states, such as California, Illinois, and Massachusetts, require mileage reimbursement. Everywhere else, the IRS rate is simply a best-practice benchmark, not a legal requirement.

How Industry and Company Size Affect Reimbursement

Different industries take very different approaches to mileage pay. 

For example, in the construction industry, many firms typically average in the $0.28–$0.29 per business mile range. They often make up for it with per-diem stipends or tool allowances. By switching from owned fleets to reimbursement programs, there’s the potential to cut overall vehicle program costs by up to 30%.

Company size also plays a role. A smaller business could opt to stick with straight Cents per Mile (CPM) reimbursement, usually below the IRS rate, since it’s simpler to manage and because they may only have a few employee drivers. 

Note that one of the rules for FAVR eligibility is a minimum of 5 drivers who drive a minimum of 5,000 business miles annually.

Other companies may opt for a setup that combines CPM reimbursement with a FAVR program, offering low-mileage and occasional drivers CPM reimbursements, and higher-mileage drivers reimbursements through FAVR.

How to Design a Fair, Tax-Efficient Program

Flat allowance plans may appear to be a simple option for businesses, but they’re also unbalanced. High-mileage drivers can end up overpaid while low-mileage drivers get shortchanged.

FAVR fixes that by separating fixed costs (like insurance, depreciation, and licensing fees) from variable ones (like gas and maintenance). 

When done according to the IRS rules for accountable vehicle reimbursement programs, every dollar stays tax-free, and employers usually save up to 30% compared to taxable flat allowances.

It’s essential to note one of the big benefits of FAVR: it accounts for regional differences. Instead of a flat allowance or a set CPM rate, FAVR represents the genuine cost of business driving for each employee’s region. 

Automation makes this process easier. GPS-based mileage tracking, such as through apps like Cardata Mobile, can save about 4,000 admin hours per 100 drivers per year, producing clean, audit-ready logs without the manual time spent maintaining spreadsheets.

Putting the Numbers to Work

Wondering if your current reimbursement setup is serving both your business and your team effectively?

Run the numbers and model FAVR scenarios for drivers who log 5,000 or more business miles per year to see the potential benefits. Implementing automated mileage capture can help keep your program IRS-compliant while also reducing the administrative burden of manual mileage tracking.

Reimbursing employees for eligible work travel is generally more equitable under a FAVR vehicle reimbursement program. Payments are more likely to reflect actual driving expenses compared to a Cents-per-Mile plan or a flat-rate allowance.

Curious how this could work for your business? Schedule a demo with Cardata’s experts to explore how a well-managed vehicle reimbursement program could benefit your team.