Some commonalities seems to be:
1. Traditional IRA => Roth IRA conversion
2. Some non-deductible contributions to the Traditional IRA (form 8606)
There is no mention (that I can find) of the FED_Taxable_Inherited_IRA error occurring prior to Feb 26 - Feb 27. Just spitballing here, but another possible commonality may be estimated taxes. In my case, I paid estimated taxes (to cover the IRA conversion) in 2020, but I could not file my 2020 return using Turbotax prior to Feb 26 because there was an error with Form 2210 - Underpayment of Estimated Tax. I did not have an underpayment, but no matter, Turbotax wouldn't process my return until an updated version of Form 2210 was released on, you guessed it, Feb 26.
I'm wondering if other folks with FED_Taxable_Inherited_IRA error also had estimated taxes paid, and also waited for the updated Form 2210.
Thoughts?
