The missing piece is to enter the non-deductible Traditional IRA contribution that you made. After this is entered, the basis of the Traditional IRA will be taken into account and the conversion to the Roth IRA will be non-taxable.
Take a look at the following TurboTax article for step-by-step instructions. Follow the steps shown under Step 1: Enter the Non-Deductible Contribution to a Traditional IRA:
How do I enter a backdoor Roth IRA conversion?
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
