Here is the definition for how line 9 percentage of business use is calculated on the Car and Truck Expenses Worksheet:
The program divides lines 6 by line 5c (then multiplies the result by line 9b divided by 12 months, if line 10b has an entry).
If you have indicated that you do not have a record of the personal mileage for the year, then there is a special allocation that will reduce the percent of business use as described here:
Check the appropriate box to indicate whether or not you have records for the full tax year for any personal miles driven. When no records exist for your personal mileage, a special allocation based on number of months of business use is required to determine your business use percentage. TurboTax automatically computes the number of months of business use and the special allocation when you check "No" here.
@blueridge9999
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