For reimbursed business miles to be tax exempt they must be accounted for.
You seem to be under a general plan that does not require you to submit a record of your mileage to your employer to be reimbursed.
- Rather,
- If your reimbursement is more than the federal rate, such as the standard mileage rate or a FAVR,
- The amount up to the federal rate is reported in Box 12 of your W-2 form using Code L.
- While the amount in Box 12 isn’t taxable, the excess reimbursement will still be included in Box 1 of your W-2 form.
Please see How are taxable mileage reimbursements reported? in Is Mileage Reimbursement Taxable Income?
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