@dmertz I had two 401(k) accounts A and B from two companies and no IRA account on 1/1/2017. Later in February the RMD distributions occurred on both 401(k) accounts. Then 401(k) B rolled over to a traditional IRA in May. To use your method above which had an example of $190,000 2017 year-end balance, do I use 12/31/2017 balance of 401(k) A, and use 12/31/2017 balance of traditional IRA (which came from 401(k) B rollover)?
And are there any other things I need to know to correctly report tax?
I thought my basis in nondeductible traditional IRA contributions should not change after the above rollover. I thought the total of such contributions should still be a simple mathematical addition, i.e. adding up the amount in each past year's 8606 forms. is this not correct? Thank you.
