Someone explain why rayvt's rollover method isn't just extra footwork for no gain.
Assume taxes for year are $10k and RMD is $20k.
So do your preferred mix of QCD + partial RMD totalling $10k anytime the first 11 months of the year.
Then do a $10k (remaining) RMD on 12/15, 100% withheld, and you're all set!
Yeah, that's probably simpler.
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You want to accomplish three things:
1) You prefer to take IRA withdrawals late in the year, in order to capture the typical investment growth during the year.
2) Take an IRA withdrawal late in the year, 100% withheld, enough to satisfy the safe harbor withholding amount.
3) Take your RMD, but which you do not need the money.
There are constraints.
1) Sequencing rule is that all IRA withdrawals up to the RMD, is an RMD withdrawal.
2) A QCD withdrawal is non-taxable _ONLY_ if it is an RMD withdrawal.
3) You can do a 60-day rollover of a non-RMD withdrawal, back into the IRA.
4) The re-deposit rollover must be done within 60 days of the withdrawal.
5) You cannot do a 60-day rollover of an RMD withdrawal.
In January you have a new RMD. You would like to use that cash for the tax withholding of the _previous_ year.
But time does not go backward, so you have to make a withholding withdrawal in December using the money that you must withdraw next year.
Now you could do that by taking a withdrawal in December and then the next day write a check and send it to the IRA custodian as a 60-day rollover. (It does not have to go back into the same IRA account, any of your IRA accounts will do.) That's assuming you have the money in your checking account. Then sometime after January 1st, use RMD money to replenish your checking account.
But you don't have to do the rollover the next day -- you have up to 60 days to do it.
You would prefer to take your RMD late in the year. Fine, but you only have 60-days to do roll the money back.
Doing the rollover also pushes the tax on that withdrawal into the next year.
OTOH, if you truly don't want or need your RMD, you could skip all this stuff and just take your RMD in December and have the safe harbor amount withheld. (Take any QCD first.)
A lot of people take their RMD in-kind, by transferring stocks from the IRA to a taxable account. The tax withholding has to be cash, of course.