As my answer below indicates, the earnings are reported by entering into TurboTax the code JP 2017 Form 1099-R that you expect to receive. Since there should be no tax withholding (having taxes withheld on the earnings makes reporting more difficult since the taxable amount is reportable on the 2016 tax return but the withholding is reportable on the 2017 tax return), the details of the Form 1099-R will not be submitted with your tax return, so the only things you need to enter accurately are boxes 1, 2a and 7. To avoid TurboTax giving an error for missing information, you can guess at the payer's name and EIN. Only the results on Form 1040 line 15, 59 and Form 5329 will appear as part of your 2016 tax return.
