I did a backdoor Roth conversion mid year 2020 for dollars that were contributed in 2019. In December of 2020 I made another non-deductible contribution to my Traditional IRA with the intent to convert it right away. I forgot to convert it and now we're in 2021. How does the pro-rata rule affect me now if I convert my December 2020 contribution? I plan to do another backdoor roth conversion in 2021 which means I'll be converting 120000, 6k from December 2020 and 6k from a contribution made in 2021.
