You cannot do that. The last day to do a 2020 conversion was Dec. 31, 2020. Any conversion after that is a 2021 conversion reported on your 2021 tax return next year.
You are confusing a conversion with a *contribution* that can be made up to the 2020 tax return due date. Conversions are reported in the year that the conversion took place.
**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.**
