A few years ago, I inherited an IRA from my mother. There were some non-deductible contributions (about $2000) made to this IRA, so every year, I have to add up the value of my IRAs and do the ratio thing. It would simplify things for me and the IRS if I could just withdraw all of that non-deductible contribution instead of carrying on forever. But there's no way to do so, is there? (I have actually withdrawn the entire inherited IRA this year, but the carryover will remain, correct?)
There is no way to “cherry pick” your withdrawals and take out only the non-deductible contributions.
If you have multiple IRAs, then yes, any remaining non-deductible contributions will be transferred your other, non-inherited IRAs, once you close the inherited IRA.
If your mother’s IRA is the only one you have, then the remaining non-deductible contribution would be withdrawn with the rest of the account.
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If you close the inherited IRA, its entire basis is removed also.
It doesn't "move" to your regular IRAs.
That's what I want to do. Do you have a reference for this?