Question about 1099 R

[dmheffron]

In 2025 I transferred a lump sum from my AFTER TAX 401(k) account to my Roth 401(k) account (my plan permits pre-tax and AFTER TAX contributions).  I just received the 1099 R and it seems incorrect.  There is nothing on the form that indicates these funds were after tax.  It's treating the funds as if it originated from a traditional pre-tax account.  There is a G in Box 7.    

[RogerD1]

A code G in Box 7 would be correct in this situation.

If these are all truly after-tax contributions to your 401(k), that you transferred, there should be an entry in box 5 on the 1099-R.  If the amount in box 5 matches the amount in box 1, there will be no tax paid on this conversion.  You will get questions later in the TurboTax interview asking if these were after tax contributions that you transferred to a Roth and you will need to enter the amount of the after tax contributions on that screen.

Your 401(k) custodian should have tracked your after-tax contributions and reported them in box 5 - if not, you may want to call them and have the 1099-R reissued to reflect the fact that you converted after-tax contributions to a Roth 401(k).