If your own IRA ( IRAs if married) do not have a prior years basis
you can pretend that the IRA is a regular IRA with a basis and TurboTax will calculate the taxable part.
You still have to file on paper with your own Form 8606 because
- you are tricking Turbotax with fabricated 1099-Rs and/or overrides, and
- TurboTax will not put the correct names on Form 8606.
Of course, this assumes you know what to do with a prior years basis.
