TheWizard
Thinks s/he gets paid by the post
That whole idea of using other after-tax money to pay the taxes on a Roth conversion has been around for a while.One option to avoid quarterly estimated payments is divide your Roth conversion into 2 parts. The larger first part is the part that 100% makes it into your Roth IRA. Then in December you can convert the smaller second part and withhold taxes on all of it. That withholding of taxes is considered timely through out the whole calendar year, thus eliminating quarterly estimated payments. The negatives are that withholding is considered income unlike if you paid your taxes from money under your mattress, and less is put into your Roth.
But it doesn't account for specific circumstances.
In my case, for instance, I had a good sized tax-deferred balance (not quite $1M) at start of retirement and very little in my taxable account.
I was over 59-1/2, so no EW penalty.
I had both pension/annuity income and withdrawal from 403(b) income in those days before SS. So which did I use to pay taxes on my Roth conversions with?
And then I had divorced spouse SS income from age 66 to 70. Maybe I used that to pay Roth conversion taxes with.
They talk about money being fungible.
I don't particularly like the word "fungible", but that doesn't really matter...