@tberbari
I do not have any official update. However, I did some research and here's what I found out:
1) The calculations on the form are correct, the words are not. I found the form and associated instructions on the IRS website, and the amount to be transferred to the worksheet is supposed to be from Form 8615, line 14. Bottom line: The words on the form, and the help link, are incorrect.
2) After I figured this out, things still seemed off a bit, so I started my child's tax return anew. Between restarting and perhaps an update or so, I now get a consistent tax amount. I suspect that there might have been a bug in the program regarding when the worksheet was required - I think this has been addressed as it does not currently reoccur in my environment.
Whenever I don't understand something that TurboTax computes, I start by going to forms view, and then further to the IRS (or state tax) website for information about that form. I've found this to be a very helpful path to understanding (not that taxes are understandable!).
I hope this is helpful to you.
