IRA deductions require the new 1040 Schedule 1 that is not supported in the free edition - it requires Deluxe or higher.
The new "simplified" 1040 form for 2018 is now the only 1040 form. The old 1040, 1040A and 1040EZ have all been replaced with the new 1040 and 6 new schedules for additional items that are transfer to the new 1040.
https://ttlc.intuit.com/questions/4511015-what-are-the-new-schedules
The TurboTax Free Edition only supports the basis new 1040 form and not any additional schedules. If schedules are needed then Deluxe or higher will be required depending on which schedule and types of income you have.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**