Retirement tax questions

@FangxiaL  Thank you again. 

 

I only have one last question I promise. While amending my 2020 tax return and adding 1099-R to report my earnings from box 2a, will I also mention federal and state tax withheld amount in 2020 return? Or will I mention Federal and State tax withheld amount in 2021 return only since it was withheld in 2021? I very much appreciate your reply to this. Thanks again!