@Opus 17 Thanks so much! I was reading a little about this in the form 2210 that @fanfare mentioned. So in my situation, just the 20% federal tax that Fidelity withheld before cutting the check will FAR exceed the 110% of my 2021 tax liability by itself so I can just pay the rest when I do my taxes and not fear any penalty. In the mean time, I can at least let the money gain a little interest for a few months. However minimal it will be, it's something. I am not likely going to risk investing any in the market at this time. Now I will just look into the rules for state tax (NJ in this case) but I will probably just make the payment on that now since it's much less than Federal anyway.
Thanks to everyone who replied.
