I inherited an IRA from Dad in 2017. I had assumed that all of it was pretax contributions so since then I have been getting RMDs and filling out TurboTax and when asked by TurboTax, I have indicated that all contributions were pretax. I was going through old records and ran across forma from the late 1990's that his accountant filed that shows there was a fairly large part that is actually a post tax contribution. The accountant didn't file the form to document the post tax portion after the late 1990's so when I took over his estate and looked at his tax forms from the early 2010's I didn't know he had made post tax contributions. Ok, so the question is, when I do my taxes for 2023 and beyond can I just fill in the TurboTax for the inherited IRA with what I NOW know is a portion of it as being post tax and pay tax on the taxable portion that TurboTax calculates? I've always been taxed as if it was all pretax contributions.
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