Gambling winnings are fully taxable and must be reported on your tax return. Gambling income includes, but is not limited to, winnings from lotteries, raffles, horse and dog races and casinos, as well as the fair market value of prizes such as cars, houses, trips or other noncash prizes.
Depending on the type and amount of your winnings, the payer might provide you with a Form W-2G and may have withheld income federal taxes from the payment.
Here are some general guidelines on gambling income and losses:
It is important to keep an accurate diary or similar record of your gambling winnings and losses. To deduct your losses, you must be able to provide receipts, tickets, statements or other records that show the amount of both your winnings and losses.
For more information see IRS Publication 529, Miscellaneous Deductions, or Publication 525, Taxable and Nontaxable Income, both available on the IRS Web site, IRS.gov, or by calling 800-TAX-FORM (800-829-3676).
Remember that for the genuine IRS Web site be sure to use .gov. Don't be confused by internet sites that end in .com, .net, .org or other designations instead of .gov. The address of the official IRS governmental Web site is http://www.irs.gov.
Courtesy of the IRS.