As background, we've been using Turbo Tax for many years to file our taxes. My wife opened a Traditional IRA in 2014 and made non-deductible contributions to it. Form 8606 was included in our Turbo Tax filing for 2014 and was correctly filled out. However, Form 8606 was not included in our 2015 Turbo Tax filing even though non-deductible contributions were made to that IRA in 2015. This also happened in 2018. Form 8606 was included in our TurboTax filings for 2016, 2017, and 2019, but Turbo Tax entered $0 on line 2 (Basis) on each of these Forms (not sure why). No additional non-deductible contributions were made to this IRA after 2019. We need to establish Basis for this Traditional IRA as my wife has done a Roth Conversion on the entire IRA recently, and we will need to submit a Form 8606 as part of our 2022 Tax Return. I assume that we will need to mail Form 8606 for the years 2015 through 2019 to the IRS, and pay a $250 penalty ($50 per year).
My questions ...
How do we determine which IRS Office to mail these Forms to?
How do I ensure that Turbo Tax gets this right when we do our taxes for 2022?
What additional supporting documents should we submit to the IRS with the Forms 8606?
Please advise. Thanks.
