The one-time registration fee is considered a sales tax, and you can add it to your sales tax table amount. TurboTax will select which tax is higher: your sales tax or your state income tax to compute your deduction.
"The Internal Revenue Service (IRS) has determined that the Iowa one-time registration fee qualifies for the New Motor Vehicle Taxes Deduction taken on federal Schedule A, line 7 or as indicated on federal form 1040, line 40b. The Iowa one-time registration fee (formerly called motor vehicle use tax) is imposed at the rate of 5 percent on the purchase price of registered vehicles."
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