The 8606 line 15b should be on the1-4- line 4b.
Sounds like your entries are incorrect. Your 2020 non-deductible contribution must be on the 8606 line 1, any 2019 or earlier non-deductible contributions on line 2 - the total on line 3.
If your IRA 2020 year end value was zero then the deduction worksheet line 4 should be zero.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
