Tax service should be taken after getting a big win but gambling tax for small amount will be dangerous to a gambler. Because if you win only 20$ and you have to pay high taxes, it can get you in trouble. Because you won't get a chance to enjoy your winnings because most of your winnings will be taken for taxes. In my opinion this tax should be adapted to the situation of the gambler and should be levied only on big wins. Tax is mandatory in my country for big money and you cannot avoid it.