Retirement tax questions

It MAY be possible to get the IRS to route your money differently - assuming Congress & the President get around to enacting this beast of a bill -  by setting up EFTPS to point to your preferred account.

EFTPS - Electronic Federal Tax Payment System® - at eftps.gov - to get started, then make a $1 estimated tax payment.  With luck, they'll recognize this as your most recent bank account and send the money there.