TurboTax uses the IRS rules and worksheets as shown in IRS Schedule A for the Sales Tax deduction.
Go to IRS Schedule A instructions (2016) for Sales Taxes starting on page 5 for the Worksheet and page 14 for the Sales Tax State tables - https://www.irs.gov/pub/irs-prior/i1040sca--2016.pdf#page=5
See screenshot for Tax and Interest Deduction Worksheet for tax year 2016 from TurboTax 2016 Premier desktop edition.
To enter your sales taxes
- Click on Federal Taxes (Personal using Home and Business)
- Click on Deductions and Credits
- Click on I'll choose what I work on (if shown)
- Scroll down to Estimates and Other Taxes Paid
- On Sales Taxes, click the start or update button
Or enter sales tax in the Search/Find box located in the upper right of the program screen. Click on Jump to sales tax
