This loss can be claimed only if you had a zero balance in all of your Roth IRA accounts on 12/31/2016. TurboTax automatically calculates this deduction and reports it on Schedule A when you properly enter your Form 1099-R as VolvoGirl indicates, click the continue button on the Your 1099-R Entries page, enter the amount of basis you had in Roth IRA contributions for years prior to 2016, and indicate that you did not have any Roth IRA accounts "open" at the end of 2016.
