How come my base pay is taxed around 20% and my big commission checks are taxed at around 40%. Makes no sense

Could I sent you a copy of the return and have you look at it for me and see if I should amend it? I should have had one of you looked at it before I sent it in...

It’s so weird I put that first w2 in with the base plus commission job and the return made sense. That was 9 months at 62,000 income with about 30,000 of that n...

My base pay gets taxed around 20% and my big bonus checks get like 40% taken out. That’s not the same math being deducted?