Theres a bar in Nenana, Alaska called Moochers. I bartended there from the summer of 1982 until the spring of 1983. The slot route operator would come through every two weeks and empty out the money in the pool table and the jukebox.
It was a 50/50 split between him and the bar. He made the receipts out for exactly half the money taken in. Only 50% of the money went into the bars books and only 50% went into his books. The rest was all under the table.
That's how easy it is to pencil the IRS.