TurboTax Free Edition is for taxpayers with very simple returns that can fit on the new 1040 form without any schedules. Here are some FAQs that can provide further details.
https://ttlc.intuit.com/questions/2575733-why-do-i-have-to-upgrade-from-free-edition
https://ttlc.intuit.com/questions/1913043-is-turbotax-free-edition-right-for-me
https://ttlc.intuit.com/questions/1899480-why-am-i-being-charged-for-turbotax-free-edition
