"next was determine how much is taxable. I put in the difference."
It seems odd that TurboTax would be asking that. Did you somehow indicate that the General Rule applied? The General Rule only applies to nonqualified annuities and such annuities are not eligible for rollover. For distributions from qualified plans where box 2b Taxable amount not determined is not marked, TurboTax would normally determine the taxable amount on its own.
Just to confirm, what is the code in box 7 of this From 1099-R?
Is the IRA/SEP/SIMPLE box marked?
Any other boxes marked?
