When more than one vehicle is listed for Federal Schedule C, the vehicle information will transfer to Form 4562 instead of Part IV of Schedule C.  The vehicle information will also transfer to Form 4562 when another asset entered on the return creates the need for Form 4562. This may be true even if that asset was fully depreciated using Section 179 or bonus depreciation. In these instances, Form 4562 will print (and be electronically filed) with the return.

Conversely, if there is only one vehicle asset and the Standard Mileage Rate is selected, the information will transfer to Schedule C Part IV, Lines 43 through 47.  There is no need for Form 4562 in this instance.

Per IRS Instructions for Schedule C, page C-6, if you are required to file Form 4562 for any other reason, then the vehicle information would be listed on there and not in Part IV of Schedule C:

Information on your vehicle. If you claim any car and truck expenses, you must provide certain information on the use of your vehicle by completing one of the following.

1. Complete Schedule C, Part IV, Part III, if: (a) you are claiming the standard mileage rate, you lease your vehicle, or your vehicle is fully depreciated, and (b) you are not required to file Form 4562 for any other reason. If you used more than one vehicle during the year, attach a statement with the information requested in Schedule C, Part IV, for each additional vehicle. 
2. Complete Form 4562, Part V, if you are claiming depreciation on your vehicle or you are required to file Form 4562 for any other reason (see Line 13, later).

Note. In the TaxAct® program, even if Form 4562 is not a part of the printed return, it is still populated in the data file when the Depreciation and Vehicle Worksheet (which contains the information on the vehicle) is filled out. Form 4562 will not print with the return (nor be electronically filed) if it is not needed; however, do not delete it as that will remove the vehicle information.