If you are itemizing deductions and want to use sales tax as a deduction you can enter the sales tax rate. If you are not itemizing then it will not make a difference.
https://ttlc.intuit.com/questions/1900791-how-do-i-find-my-local-sales-tax
https://ttlc.intuit.com/questions/2566624-how-much-sales-tax-did-i-pay-last-year
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