Originally <a href='http://www.sportsbookreview.com/forum/showthread.php?p=24859053'>posted</a> on 11/22/2015:

There is a line on your tax return for gambling winnings. If you use e-filing, you should be able to find the input with a search function.

If you are gambling offshore, no reason to pay your taxes because gambling offshore is illegal, Paying taxes on offshore gambling is like reporting income for your meth lab.