2016 sales tax calc doesn't include effect from local sales tax. That's based on comparison to federal worksheet that calcs higher deduction? How can i over-ride calc?

It will if you entered the correct percentage of state sales tax and local sales tax in the Sales Taxes section of the program under Deductions and Credits/Estimates and Other Taxes Paid

Despite inputting the sum of my state and local sales tax rates into the turbo tax section you've mentioned it only calculates my state portion.  I say that because the state tax value from the IRS worksheet matches the Total amount of turbotax state AND local. Which means the turbotax calculation is pulling my state % from a table outside what i input.

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