This fella isn't back to answer the questions that people need to give the best answers, like Where are you from OP? This is very important to know because you can be from a country that doesn't care about paying taxes on gambling, there aren't many countries that ask gamblers to pay taxes.

We don't pay taxes when we gamble in my country, but some other countries closest to our border do pay taxes, even on items they purchased online, but not here in my country.

So if you want the best guidelines you should reveal your country name, it is really a shame that the government want some cut from gamblers risked and win money, what will they do for gamblers when they lose money? I guess nothing, and this makes it so unfair.