If you are betting in the UK you will not pay any tax on or sports betting winnings, no matter how a lot you are playing or winning. https://git.pix-n-chill.fr/elanamacklin4/allstarwiki/wiki/%EC%84%9C%EC%9A%B8%EC%97%90%EC%84%9C-%EC%9D%B8%EA%B8%B0-%EB%A7%8E%EC%9D%80-%ED%86%A0%ED%86%A0%EC%82%AC%EC%9D%B4%ED%8A%B8%3A-%EB%A8%B9%ED%8A%80%EA%B2%80%EC%A6%9D%EA%B3%BC-%EB%B3%B4%EC%A6%9D%EC%97%85%EC%B2%B4%EC%9D%98-%EC%A4%91%EC%9A%94%EC%84%B1