@MDM, I am not 55 in real life, but I am in this story. I fixed my bad math. And yes, I made a mistake in #5...I meant post-tax. Thanks for pointing those out so I could fix and make my scenario correct.
But for the main part, there are NO restrictions in converting an IRA, regardless of source, amount, or anything else to a Roth?
Here are the only restrictions I know of:
1. The IRA is a traditional IRA.
2. The IRA is yours.
3. The conversion is not part of an RMD or 72(t) (aka SEPP), or some other weird things that probably wouldn't apply to you. Since you mentioned a timeframe of between now and 72, the RMD and SEPP restrictions probably won't apply to you either.
There is also the restriction on indirect rollovers as
@terran mentioned. My solution to that limitation is to not do them. I just have my traditional IRA and Roth IRA at Vanguard, and I can do Roth conversions online via a web form.
Here is another thing I'd like to know. Does anyone have a source, preferably an IRS source, that says you can do one thing with part of an inherited ira/457/403b/whatever and something else with the rest of it? That would really solve some issues for me...
Well I certainly know that you can, but I'm just SGOTI.
@terran and
@MDM may be able to cite chapter and verse for you. The closest I can find is page 124 of IRS Pub 17 (
https://www.irs.gov/pub/irs-pdf/p17.pdf) , where it talks about rollovers. Unfortunately it seems mostly implicit instead of explicit. The other source I have is that I and many others have done Roth conversions of only part of my IRA.
There may be *plan rules* on your 457 or 403(b) that restrict you from doing partial withdrawals - meaning, they might make you take a total distribution - but I doubt that. You could find out by checking the plan document as
@terran mentions above. Even if that were the case, you could roll the 457 or 403(b) into your IRA, and then you can definitely do partial stuff from there. (Although, as noted previously leaving the 457 where it is is probably a good idea if you want to use those funds to get you to 59.5.)