You are correct that the 2023 business use standard mileage rate is $0.655 cents per mile. However, for 997 miles of business use and $0.655 cents per mile, the deduction would be $653.04.
If you still believe there to be an error in TurboTax calculating the mileage deduction, please share whether you are entering the mileage as a Schedule C business expense or in another form so that we can take a closer look.
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