In line 5 on Schedule A, you can deduct either state and local income taxes here or state and local sales taxes. You can't do both.
From the IRS Instructions for Schedule A:
"If you elect to deduct state and local income taxes, you must check box a on line 5. Include on this line the state and local income taxes listed next.
If you live in a state without income taxes, you can choose to deduct your sales taxes. Tell TurboTax your state and local tax rates and it will compute the amount to deduct, based on an IRS table.
Note that you can deduct actual sales tax paid, if you kept all the receipts (which is why almost no one does it).
Also note that if you made a major purchase like a car or boat, you can add this sales tax to the computed sales tax from the table.
Why is this amount the taxes withheld and not the actual taxes paid? How does one account for the actual state taxes paid then?
Excellent question! The amount of taxes withheld is what was paid up to that point. It does not complete until you file the tax return.
@JONTAX You can fill this form out for someone to call you.