[ChrisV]

I live in Australia. Gambling income is not taxable unless you are playing "as a business", which has a loose definition. There has only been one successful prosecution in the history of Australian gambling tax law. That was a guy making half a mill per year off horses. He had offices, employed people to do legwork for him, and kept records. That all added up to a business. If you have another job, there's no chance you will be prosecuted, so don't worry about it.