Most box 14 items are notes for your information only. (A few items may be taxable in some states.) If there is no specific listing, choose Other or ignore it.
If you are a W-2 employee, and your mileage was reimbursed on an accountable plan (you prove your mileage with records), then the reimbursement is not taxable income. It is only reported in box 14 as a note for your information. If your mileage was not reimbursed on an accountable plan (you did not have to prove it with records) then the reimbursement should have already been added to your box 1 taxable wages and was subject to tax withholding. In that case, the box 14 amount is also only a note or reminder, and has no additional effect on your tax return.
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