To enter Sales Tax (either Actual Amount or Table Amount) in the TaxACT program:
This will allow you to put in the actual amounts paid. You will need to have receipts as proof for these amounts.
Allows you to enter the information and use a standard tax (percentage) rate. You may also be able to add the state and local general sales taxes paid on certain specified items, such as motor vehicles (purchased or leased), aircraft, boats, homes (including mobile and prefabricated homes) and home building materials.
Per IRS Schedule A Instructions, page A-6:
Instructions for the State and Local General Sales Tax Deduction Worksheet - Line 7
Enter on Line 7 any state and local general sales taxes paid on the following specified items. If you are completing more than one worksheet, include the total for line 7 on only one of the worksheets.
Per IRS Publication 17 Your Federal Income Tax, page 153:
Taxes and Fees You Cannot Deduct