In this case, send a copy of your mileage log, but that is not what is reported on line 40 on a 1040A. Line 40 on a 1040A reports withholding. It is reporting that you paid 1393 as a tax. Send the IRS what they ask for and what you have, but if you claimed tax paid, and there wasn't any, you may need to pay the IRS. If this is the case and this is for 2017, you can pay the additional tax before April 17th to avoid interest. I do not know how mileage could be reported as tax in the TurboTax program. If this was for travel to work, why don't you have a W2 or 1099 or Self-Employment Schedule C?
