A max. coupon amount is the maximum amount of money the casino will add to your deposit when using a deposit bonus. For example, when you use a 100% bonus with a max. coupon amount of R8000, if you deposit R8000, the maximum amount the casino will add to that is R8000. If you deposit R10,000 and use a 100% deposit bonus, the casino will still only add a maximum bonus amount of R8000 to your deposit of R10,000.