TaxAct does not support Form 8834 Qualified Electric Vehicle Credit; however, if you qualify for this credit you can still prepare your return with TaxAct and use the paper-file method to submit your return to the IRS.
Per IRS Instructions for Form 1040 and 1040-SR, on page 99:
Per IRS Form 8834 Qualified Electric Vehicle Credit, on page 1:
Caution: This form only applies to qualified electric vehicle passive activity credits from prior years (allowed on Form 8582-CR or Form 8810 for the current year). The qualified electric vehicle credit was available for certain vehicles placed in service before 2007.
Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.