Retirement tax questions

Thanks for the response. I didn't even think about the impact this would have to my 2020 taxes (whoops!). I will plan to pay estimated taxes for 2021 and 2022.

 

I do not intend to pay back the distribution, and expect to pay the full tax amount (I am spreading out the tax liability over the 3 year period primarily because I expect my 2021 and 2022 tax liability to be significantly less than 2020 - so lower tax bracket).

 

So my question now is how can I ballpark the the 2020 penalty so I know roughly what to expect that will cost? I withdrew $65k total from 401k, and had federal tax due for 2020 of $7,100.