You will play in a online casino games and yes, it's your lucky day! You win a nice amount, and then? You deposit your profits into your own bank account, but do you still have to pay tax or declare your profits on your tax return?
No, you pay 0% gambling tax on your winnings in an online casino. The online casinos arrange this for you and pay taxes to the tax authorities themselves. The moment you win $1000 on the online roulette table (or something else) then you can pay this out to your account without worries, without having to pay gambling tax or having to declare this to the tax authorities or your tax return.