Since this law was enacted late in the year, most people won't have
their sales tax receipts for the entire year. To help with this
situation, the government will be releasing tax tables based on income,
number of dependants, filing status and state of residence that you can
use in place of receipts. You'll have the choice to use your own
receipts or the tables.
This new deduction can especially benefit taxpayers that purchased a
car or boat this year (or plan to before the end of the year). The law
provides that taxpayers that purchased big ticket items such as cars
and boats (possibly with more high priced items added later) can deduct
the actual sales tax paid on the purchase in addition to the amount
listed in the IRS tables. If you don't have your receipt for your auto
purchase, go to the dealership where you purchased the vehicle to get a
duplicate.
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More information on the state sales tax deduction:
http://www.savingadvice.com/forums/showthread.php?t=2784
http://www.savingadvice.com/forums/showthread.php?t=4053
Just add on your car sales tax to the appropriate sales tax table
amount.