Are you using desktop 2017 software? You cannot use the current online software for a 2017 return!!!!!!
You can enter the sales tax you paid for the boat you purchased in 2017 by going to Federal>Deductions and Credits>Estimates and Other Taxes Paid> Sales Tax. You will be asked if you paid sales tax on a major purchase, and you will be able to enter the sales tax you paid for your new vehicle.
Sales tax is an itemized deduction. If your state has a state income tax, you have to choose between using the deduction for your state tax paid OR the sales tax deduction, whichever is higher. The TT process will suggest one or the other as you prepare your return.
“Major purchases” that you can enter for the sales tax deduction include:
Motor Vehicles (cars, trucks, motor homes, RV’s, sport utility vehicles and off-road vehicles
Aircraft or boats
Building materials for major home improvements
You cannot deduct: furniture, jewelry, home electronics such as TV’s or computers
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