Yes, in Brazil, winnings from sports betting must be declared on our income tax return, and the tax rate is 15%. Thankfully, it's only on the winnings. Even so, I think it's a high tax to pay; I've mentioned it in another thread, and I've seen that other countries have even higher rates.
What’s the minimum amount that actually needs to be declared anyway, is it $1,000 or more? If that’s the case, then it’s not really an issue for most people who aren’t betting at that level.
Still, honestly, I don’t like the idea of paying taxes on winnings at all. If you offset those wins with losses, I’m pretty sure most of us are net losers anyway. I don’t see why the government doesn’t allow losses to be deducted. It feels like they just want a cut when you win, but they don’t care at all when you lose. That just sounds greedy to me.
Here in our country, winnings of $200 and above are taxed at 20%, but that applies to lottery only.
For sports betting and slots, there’s still no specific tax rule in place.