How can I use the free edition after initially electing Deluxe but then finding out that I am using the standard deduction and not itemizing?

[mesquitebean]

You may or may not be able to use Free Edition, depending on whether you need one of the new Federal schedules 1-6.

I'll tell you how to downgrade lower down in this posting.  Be aware you could still encounter a condition that requires you to upgrade to Deluxe.

In any case the regular Free Edition is more limited this year due to tax law changes.    If you need any of the new Schedules 1-6, for instance, then you can't use Free Edition.    You can read about the new schedules at the link below.  If you click the blue "see schedule" link there, it will show you what each schedule looks like.

https://ttlc.intuit.com/questions/4511015-what-are-the-new-schedules

Here are some common things that cannot be handled by the regular Free Edition:

     Itemized deductions
     Business or 1099-MISC income
     Sales of stocks/mutual funds/bonds
     Rental property income
     Foreign Earned Income
     HSA
     Credits, deductions and income reported on the new schedules 1–6, such as the Student Loan Interest Deduction

If you are sure you could use the regular Free Edition, you could downgrade from Deluxe to Free Edition, as long as you have not paid or registered.  You would use the feature "Clear and start over."   Here's how:

https://ttlc.intuit.com/questions/1894467-can-i-downgrade-to-a-lower-priced-version-of-turbotax-onli...

If it turns out you can't use the regular Free Edition, TurboTax also has another free product called the TurboTax Free File Program.  It is free for both Federal and State--IF you meet just one of the qualifications.   It can handle all the usual forms without the limitations of regular Free Edition. 

You have to meet only ONE of these qualifications:

1) 2018 AGI of $34,000 or less

or

2) Eligible for EIC (earned income credit)

or

3)  Active duty military including Reservists/ National Guard with military W-2 and 2018 AGI of $66,000 or less

See this FAQ for more info:
https://ttlc.intuit.com/questions/1900583-what-is-turbotax-free-file-program

If desired, here's how to switch and start over in TurboTax Free File Program.
https://ttlc.intuit.com/questions/2026912-how-do-i-switch-to-turbotax-free-file-program

NOTE:  If you switch to Free File Program by that method, and find out later you don't qualify,  you won't be able to go back to regular Online TurboTax in that same account.