TurboTax Free Edition, handles simple returns with no additional schedules. Upgrades and add-ons, such as TurboTax PLUS and Audit Defense, are available.

The following TurboTax FAQ shows the list of qualifications for the TurboTax Free Edition:  https://ttlc.intuit.com/replies/3334660

Or you might qualify for TurboTax Free File Program.

 To qualify for free 2018 federal and state tax returns in the Free File Program, you'll need to meet one of these requirements:

• Your 2018 Adjusted Gross Income (AGI) is $34,000 or less
• You qualify for the Earned Income Tax Credit (EITC)
• In 2018, you served as active duty military (including Reservists and National Guard) with a maximum AGI of $66,000, and you have a military-issued W-2

https://turbotax.intuit.com/taxfreedom/