The tax system in my country has imposed a 15% income tax on all registered gambling businesses(in addition to the 10% corporate profit tax). There isn't any tax deduction for gambling loss in my country, AFAIK. Having such tax deduction seems immoral and ridiculous. The gamblers would be incentivized to gamble more, because their loss will be deducted from their taxes. I don't know about any country in the world, whose tax system stimulates the gamblers to gamble more.
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