Deductions & credits

You have self-employed income and expenses so you must use the TurboTax Premium edition.

When entering your self-employed expenses there is a section for entering Vehicle Expenses where you can enter your business miles.

 

See this TurboTax support FAQ - https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-self-empl...