How do I get the software to allow me to deduct the sales tax for my car? It is not prompting for this information anywhere.

Go to Tax Home 

Deductions & Credits 

Estimates and Other Taxes Paid

Sales Tax     START

 

Select "Try Sales Tax" 

Select "EasyGuide"

Enter your state and sales tax rate

Select "Yes" for major Purchases  and enter the information regarding your new car 

 

TurboTax will choose the larger deduction, but you can over-ride that if you so desire by checking the box for "Change your deduction" on the "We've Chosen a Deduction for You" screen