Since the traditional IRA contribution was made for 2016, you report the nondeductible traditional IRA contribution on your 2016 tax return with 2016 TurboTax under Deductions & Credits -> Retirement and Investments -> Traditional and Roth IRA Contributions. TurboTax will prepare Form 8606 to record your basis in nondeductible traditional IRA contributions. Do not report anything about a Roth IRA with regard to this traditional IRA contribution.
You'll report the Roth conversion on your 2017 tax return by entering the 2017 From 1099-R into 2017 TurboTax. TurboTax will transfer in your basis in nondeductible traditional IRA contributions from your 2016 Form 8606 line 14, when you begin your 2017 tax return.
