The TurboTax Free Edition is free as long as you
file a 1040EZ (or 1040A with the standard deduction) and don't select any add-ons or upgrades.
The
version of TurboTax you need to use is determined by the information/answers
you have entered into your return. It may be that one of the forms you need to
file is required in a higher version of TurboTax vs. the Free Edition.
You
can see what fees currently are linked to your TurboTax account. Just
click below on "Review your fees"
https://ttlc.intuit.com/replies/3300257
Here
is a link for the TurboTax Product Comparison Chart. Scroll down for "all
product details".
https://turbotax.intuit.com/personal-taxes/compare/online/