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 the IRS Instructions for Form 1040, page 101:
Qualified electric vehicle credit.You can't claim this credit for a vehicle placed in service after 2006. You can claim this credit only if you have an electric vehicle passive activity credit carried forward from a prior year. See Form 8834.
Per IRS Form 8834, 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)