Yeah, you do. Income is Income from whatever source derived. Only a few things are excludable, and craps ain’t one of them. However, you are right in that at craps (or similar games) they almost never report your winnings by 1099 to the IRS.
However, just because the casino doesn’t report that win on a 1099 doesn’t mean you are home free. A Pit boss may get audited and rat on you, or the IRS does have undercover agents at the casinos (mostly to count tips, admittly, but they will note other things of course). It is easy for the Casino to ID you to the IRS, and then when you don’t report that large win, it’s audit time, and perhaps even handcuff time.
And like **pulykamell **said, even if no-one rats you out-you then have a large amount of money to account for. And, I want to tell you this- you might get away with not reporting it. You could show a pattern of large losses during the rest of the year and make a case that your net for the year was a loss. But, you will *not *get away with laundering it. They look upon you like a terrorist or drug dealer when they search for money laundering. Many dudes have gone to jail for laundering cash that they wouldn’t have served any time for by simple non-reporting. (The Tax Court is actually fairly pro-taxpayer. The “I wuz stupid, I am sorry, I’ll pay it all back and not do it again” defence works much better than you’d expect, and few dudes actually go to prison for *simple *tax-evasion. Money Laundering, however, is tried by Federal *Criminal *courts, and they don’t seem to buy that defence.) Thus silenus is completely wrong. His postings could land one in jail.
Back to taxation in the USA on Gambling Income.
In theory, any gambling winnings get reported above the line. Gambling losses (only to the extent of winnings) are itemized deuctions, or “below the line”. In reality the IRS knows that few ever come out ahead in the long run, and allow most dudes to net their losses vs their winnings (per tax year) and thus report nothing (since in the long run, most dudes are losers, and gambling net losses are not deductable).
However, I said “most dudes”. Some few dudes get a windfall- that Lotto megabux win, that huge slots payoff, the “pick six” and so forth. In general, those lucky few simply can not lose enough to offset that one time windfall in just a year, so the IRS requires a 1099 and often with-holding.
But, if I won more than $10,000 at craps, and it was a one time lucky streak, not offset by other losses, I’d recommend (or in reality, my Bro the Tax Pro recommends) I’d consult my Enrolled Tax Preparer and do what he said.