Does tax day (april 15th) exist in this game?

I was looking at my income for April and there was a sudden spike down on the 15-16th and then it went back up to usuall, I know there are monthly taxes. If it's not from tax day then I wonder what could have caused that dip? (server is s4e)

I believe the 15th/16th is when employee wages are paid out, I don’t believe tax day is replicated. Also, if you’re leasing aircraft then their lease payments may happen to be on that date depending on when you started the lease.