Green Papaya
Recycles dryer sheets
A 401K can have after-tax dollars but that is different than a Roth Account. The difference is the gains made by the after-tax dollars is still taxable. In a Roth account the gains are nontaxable. If I was you the first chance I get I would convert 401K after-tax dollars into a Roth 401K or Roth IRA. When you make that conversion you only have to pay the tax on the gains and not the original amount. After that you'll never have to pay tax on that again. If you're going to do a Roth conversion, after tax dollars should be the first dollars you convert.
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When we converted our 401K after-tax into Roth IRA, we paid tax on the gains in 401K after-tax portion. Our pre-tax 401K and Roth 401K roll over into IRA and Roth IRA, respectively, were non-taxable.