Can I use my unreimbursed employee mileage expense as a deduction in 2020?

Unfortunately, you can no longer use mileage on the job as an unreimbursed business expense when you itemize deductions.  In my practice I have found that, most of the time, those expenses were disallowed in an audit because the taxpayer did not keep good records to validate the expense.  That is probably part of the reason they are no longer allowed.  However, a business (or self-employed person) can still use mileage as an expense when the mileage is used for business purposes.  For 2020 the standard mileage rate for cars and small trucks is 57.5 cents per mile for mileage for business purposes.  This is down from 58 cents per mile last year.  The rate for medical purposes is 17 cents per mile and for charitable purposes is 14 cents per mile.  Mileage for moving is no longer allowed except for the armed forces.