I have 401k. I receive a statement from 401k custodian. This statement shows that I have "after tax money" in my 401k account. I would like to rollover my 401k to IRA and utilize NUA as well. I understand that basis in "after tax money" can be rolled over into ROTH IRA or used to reduce taxable NUA basis. And earnings on "after tax' money can be rolled over into regular IRA. However, there is nothing in my statement that splits "after tax" money into basis and earnings -- as I only have one singular amount for "after tax" money. How would anyone then know which part of "after tax" to go into ROTH IRA (or used to reduce basis for NUA purposes) and which part to go into regular IRA upon rollover.