When you enter a code-G Form 1099-R, TurboTax asks if you rolled the money over to a Roth 401(k) or Roth 403(b). Answer Yes. TurboTax will include the amount from box 1 of the Form 1099-R on Form 1040 line 5a but will include only the taxable amount from box 2a on line 5b. TurboTax will also put the word ROLLOVER next to the line.
