Roth Conversion is a great thing to do in "gap years" or soon after you retire.
The math whizzes will tell you it's exactly the same to stay in the IRA or switch to the Roth, except for the lousy tax bracket, so they want to make that decision based on the tax bracket the expect to be in. They're not wrong, but they haven't spent too much time volunteering in skilled nursing facilities.
What actually happens is you get forced to do massive distributions from that IRA to cover medical bills. Non-covered work, donut holes, aides, assisted living facilities, or SNFs. You wind up in the highest tax brackets of your entire life if you didn't Rothify.
If you don't have any traditional IRAs, Roth backdoors are easy. You contribute $x to a NDIRA and place it in a cash investment, then the very next day convert to Roth. You pay income tax on the 3 cents of interest which has accrued. "That was easy".
However when you already have amounts in an IRA, your conversion takes your entire portfolio in proportion. You must pay tax on the portion which is appreciation.
- Say the IRA is worth $291,000 but $91,000 of that was NDIRA contribs made in past years.
- And you do a NDIRA contribution of $9,000 more and convert $9,000. Now it's worth $300,000 with $100,000 being non-deductible contribs (a 2:1 ratio).
- When you convert $9,000 to Roth, you are converting $3000 of NDIRA contribs (not taxable) and $6000 of gains, and you pay tax on the $6000 gains.
- This reduces your NDIRA basis in the account to $97,000, and you have to keep track of that and use it next year. Ugh.
So, the Roth backdoor kinda falls apart (or at least, is a royal PITA) if you already have a large Trad IRA.