Form W-2G is used to report gambling winnings. If your gambling winnings are high enough, the payer must provide Form W-2G to you and to the IRS, reporting the amount of your gambling winnings.
If you itemize your deductions, you can deduct your gambling losses to the extent of your gambling income.
For example, if you report $5,000 in gambling income on your W-2G, you can deduct up to $5,000 of your gambling losses. If you use the Standard Deduction instead of Itemized Deductions, gambling losses cannot be deducted.