When a jackpot ofR$1,200 or more is won, slot machine attendants usually hand-pay the jackpot and provide IRS W-2G forms. Casino recommends a minimum of aR$20 tip ranging up to 10 percent of the jackpot amount.

You don't have to tip the slot attendant, it's a personal choice. Just like you don't have to tip the dealer who dealt you the winning hand, or hit your number.