https://www.irs.gov/newsroom/irs-announces-rollover-relief-for-required-minimum-distributions-from-r...
The entire amount can be rolled back. If tax was withheld then that will be recovered when you file your 2020 tax return with the 2020 1099-R box 4 withholding. It will be added to all 1099 and W-2 withholding to offset your 2020 tax liability or add to your refund. There is no way to recover that withholding now because it has already been sent to the Treasurer.
You would have to make up the withholding form other funds in order to roll the entire amount back.
**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.**
