The missing piece that is making it taxable is that there is no basis being considered in the Traditional IRA.
You should revisit the section of your return where you initially entered the non-deductible contribution to your Traditional IRA. If it was not entered as non-deductible then there will be an amount shown on Form 1040 Schedule 1 Line 20 IRA deduction.
Take a look at the following TurboTax help article for step-by-step instructions for entering the information into TurboTax in order to make sure things are reported correctly:
How do I enter a backdoor Roth IRA conversion?
@chidis
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
