Taxable Income Test

The taxable income test is a method used to determine whether a portion of a driver’s reimbursement should be treated as taxable income.

It works by comparing a driver’s total reimbursement to what they would have received using the IRS standard mileage rate, often referred to as the non-taxable limit.

If the total reimbursement is equal to or below this limit, it remains fully tax-free. If it exceeds the limit, the amount above the threshold is treated as taxable income and is typically processed through payroll.

The taxable income test is commonly applied in accountable allowance programs and for Fixed and Variable Rate (FAVR) drivers who fall out of compliance. Drivers who remain fully compliant on FAVR are not subject to this test, and their reimbursement can remain entirely tax-free.

Because the IRS standard mileage rate is based on average driving costs, higher-mileage drivers tend to have higher non-taxable limits. In practice, this reduces the likelihood that any portion of their reimbursement will become taxable.

Understanding how the taxable income test works helps organizations manage compliance and set clear expectations around mileage reimbursement and tax treatment.