Turbotax should be using the 2020 form 8615 and instructions, unfortunately you can't directly view the forms in Turbotax online. I can try and test this on the desktop program later tonight. Maybe someone else can look at this,
@macuser_22 @DoninGA @rjs maybe.
Once you finish entering your main data, and get to the filing step, there is a point where you verify your qualifications to use the free version, if you are using the IRS Freefile version. Then there is a step where you can print your return for review before filing. that may allow you to print the form and check the calculations. If the form is wrong, you can go back and make changes, as long as you don't go all the way to the final "Transmit" step
