"used the IRS sales tax calculator for 2022" - how did you do this - IRS The Sales Tax Deduction Calculator is not yet ready (see the IRS page). Check the page which appears to say that you would be using the 2021 sales tax calculator.
To know how the IRS calculates sales taxes, you can see the State and Local General Sales Tax Deduction Worksheet—Line 5a in the Schedule A Instructions.
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