TurboTax Free Edition is free as long as it is a simple return that files a 1040 with no additional schedules or upgrades. Please see below for more information and instructions on how to remove unwanted charges or add-ons.
https://ttlc.intuit.com/community/charges-and-fees/help/why-am-i-being-charged-for-turbotax-free-edition/00/25707
If there is a state return involved the state may charge for filing & then TurboTax will charge the filer.