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I rolled over a former employer's 401k to a Roth IRA in 2023. I also had other 401(k)s in 2023.
TurboTax is asking with respect to the 401(k) from which the distribution being entered was made. Any after-tax amount should be present in box 5 of this Form 1099-R. Each 401(k) is independent of the others.
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