How do I report a conversion of my Pre-Tax 401k to Roth IRA? I have the 1099-R but it shows 0.00 as the taxable amount? I believe it should be taxed but the form says 0.

You must indicate in TurboTax that your 401(k) was rolled over to a Roth IRA.

Enter your form 1099-R by following these steps:

1. In TurboTax Online, open your tax return
2. Click on Federal in the left-hand column, then on Wages & Income
3. Navigate to the list of income categories
4. Locate the section Retirement Plans and Social Security and click on the arrow on the right
5. Click Start next to IRAs, 401(k), Pension Plan Withdrawals (1099-R).
6. Enter your form 1099-R and follow the interview
7. When you arrive to the page Did you move the money to a Roth IRA?, click on the radio button Yes, this money was rolled over to a Roth IRA  and Click Continue

Simply indicating that the rollover was to a Roth IRA will not cause TurboTax to treat the rollover as taxable. To be treated as taxable, the correct taxable amount must be in box 2a.

This problem usually occurs when you request a direct rollover from a 401(k) to an IRA but fail to indicate that the rollover is to be to a Roth IRA.  When the funds are diverted to a Roth IRA, the Form 1099-R that reports the rollover as having been made to a traditional account  will be wrong.  Unless request to the plan really was to make the rollover to a Roth IRA and the plan simply made an error by reporting a taxable amount of zero, the plan is unlikely to change the Form 1099-R to put the correct taxable amount in box 2a and you would need to file a substitute Form 1099-R (Form 4852) showing the correct taxable amount, with explanation.  Filing a substitute Form 1099-R precludes e-filing with TurboTax.