My employer didn list my car allowance on my W2 – should I still deduct the mileage / expenses on my taxes?
If he operates an accountable plan and reimburses you using the Federal mileage reimbursement rate for the actual miles driven then it’s a wash and the payments are not listed on your W-2 and you can not claim any deduction for business use. If he gives you a flat rate per month or operates a non-accountable plan then reimbursements must be included in box 1 of your W-2 and you would track the business miles and use Form 2106 to claim any expense deduction.