In the UK, you do not need to pay tax on gambling winnings. So, from a UK perspective, you do not need to pay tax on gambling winnings from offshore non-GAMSTOP gambling sites. You do not need to pay tax to the state of Curacao either. And we cannot find an example of a non-GAMSTOP casino on our site based in a country that requires non-residents to pay tax on winnings. Players living outside the UK playing at non-GAMSTOP casinos may be liable for tax - the US, for example, has tax laws on gambling winnings.