Where to enter business expenses
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-self-empl...
If you are using the Desktop program Search for Schedule C and select the Jump to link.
Or enter Auto Expenses under
Business Expenses - Business Vehicle Expense
Deducting Mileage
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/deduct-mileage/L6...
