@tgreszler
"The RMD amount that was inadvertently deposited into the IRA"
If you take out that RMD as an excess contribution to the IRA,
you will have effectively taken your RMD from the 401k.
You probably want to report that as a pension distribution on line 5 to satisfy the 401k RMD.
the IRA custodian will also calculate associated earnings which could be positive or negative (this doesn't matter).
So, explaining this on your "explanation statement" and substitute 1099-Rs to the IRS will be required.
Turbotax CD/download supports an explanation statement and e-File.
