Say I have some balance in my traditional IRA on 12/31/19, and also make a Roth conversion in 2019. This is subject to the pro-rata rule.
My understanding of the form 8606 instructions is that only the balance on 12/31/19 is used when calculating the taxable amount of my Roth conversion.
So, even if I made a non-deductible contribution for 2019 before April 15, 2020, that amount would not be used in the calculation.
However, it seems when I add this contribution in TurboTax, the tax due stays the same regardless of the amount I put in the "amount contributed between Jan 1 and Apr 15, 2020" field.
If I include the contributions made in 2020 for 2019 I get the same value as Turbotax, but if I follow the form instructions I'm getting a different number. Anyone have an idea which is correct ?
