CA has an added 2.5% excise tax on top of the Federal 10% excise tax.

Not sure if UT piles on like CA, for folks subject to this penalty (age 55 can avoid it if your last job)

Only 20% is withheld (you can often elect to not have any withheld) but you owe Fed and State tax when you file your taxes as ordinary income.

https://www.bankrate.com/retirement/rule-of-55/#:~:text=The%20rule%20of%2055%20is,year%20they%20reach%20age%2055.