W-9 for Gambling Winnings: Withholding, Group Bets, and Loss Cap

A gambling venue hands you a W-9 for gambling winnings when your payout crosses the IRS reporting threshold, which rose to $2,000 across all game types on January 1, 2026.¹ The form collects your name, address, and taxpayer identification number so the payer can issue a Form W-2G to you and to the IRS. The W-9 itself never leaves the payer’s files. Sign it, and you walk away with your money; refuse, and 24% comes off the top.

When the Casino Will Ask for a W-9

The $2,000 trigger is the same number for every game, but the conditions attached to it differ. Any of the following payouts should prompt the payer to request a W-9 before paying you out.¹

Slots or bingo: $2,000 or more, with no payout ratio required.
Keno: $2,000 or more after subtracting the cost of the winning wager.
Poker tournaments: $2,000 or more after subtracting the buy-in.
Sports betting, horse and dog racing, jai alai: $2,000 or more, and the payout must also be at least 300 times the amount wagered. A $10 parlay returning $3,500 counts; a $500 wager returning $2,100 does not.
Sweepstakes, wagering pools, and lotteries (including state lotteries): $2,000 or more, with the same 300-times-the-wager condition.

One point worth being clear on: these thresholds only govern when the payer must collect your information and file a report. Every dollar of gambling income is taxable whether or not anyone ever asks you to sign a W-9.² A $1,900 slot win still belongs on your return.

What the W-9 Actually Does

The W-9 stays with the payer. It isn’t filed with the IRS.³ Its only job is to give the casino, sportsbook, or lottery office the data they need to generate Form W-2G, the actual tax document reporting your gross winnings and any federal tax withheld. The W-2G is what goes to the IRS, with a copy to you.⁴

When you sign, you’re certifying four things under penalty of perjury: that the taxpayer identification number you entered is correct, that you aren’t subject to backup withholding (or that you are, if the IRS has told you so), that you’re a U.S. person, and that any FATCA exemption code is correct.⁵ Most people sign without thinking twice. If you’ve received an IRS notice about backup withholding, the second certification is the one to read carefully.

Your name and TIN from the W-9 populate the matching fields on the W-2G, with the TIN in Box 9. The payer also verifies your identity with two forms of ID, one of them a photo ID; the signed W-9 can serve as the non-photo piece.¹

What Comes Out of Your Winnings

Two different 24% withholding rules can apply to gambling payouts, and they’re easy to confuse because the rate is the same. The triggers aren’t.

Regular Gambling Withholding

Regular withholding is automatic when winnings exceed $5,000 from sweepstakes, wagering pools, lotteries, or any wager where the payout is at least 300 times the bet. The payer deducts 24% and remits it to the IRS. Slots, bingo, and keno are carved out: no regular withholding applies, no matter how large the jackpot.

Backup Withholding

Backup withholding is the identification backstop. If you refuse to provide a W-9, give an incorrect TIN, or the IRS has already told the payer your TIN doesn’t match, the payer must deduct 24% from your winnings.⁶ This applies to every type of gambling, including the slots, bingo, and keno wins that would otherwise have no withholding at all.

The payer has no discretion. Once backup withholding is triggered, you receive the remaining 76% and the IRS gets the rest. The withheld amount isn’t lost; it shows up as a tax payment on your return. But on the day of the win, you walk out with meaningfully less cash.

If a Group Shared the Bet

When friends pool money and hit a jackpot together, the person who collects shouldn’t let the full payout be reported under their own social security number. The IRS provides Form 5754 for this. The person physically collecting the money fills it out, listing each winner’s name, address, taxpayer identification number, and share of the prize.⁷ The payer then issues a separate W-2G to each person for their portion. Skip the 5754, and the entire jackpot lands on one return, with no clean way to fix it later.

Putting It on Your Tax Return

Gambling income goes on Schedule 1 of Form 1040, on the line designated for gambling winnings, and that total flows onto your main 1040.⁸² You report it whether or not a W-2G was issued. Any federal tax withheld, regular or backup, counts as a tax payment on your 1040 and should match Box 4 of the W-2G.

A large win without withholding can create an estimated tax obligation. The IRS expects tax to be paid as income is earned, and waiting until April can produce an underpayment penalty even if you pay the full balance on time.²

The New 90% Cap on Loss Deductions

You can offset winnings with gambling losses, but only if you itemize on Schedule A, and losses can never exceed the winnings you reported.² Starting with the 2026 tax year, the One Big Beautiful Bill Act limits that deduction to 90% of losses, still capped at total winnings. A player who wins $50,000 and loses $50,000 in the same year can deduct only $45,000, leaving $5,000 of taxable income despite breaking even. For frequent players who assumed losses would fully cancel wins, that gap can produce a surprise tax bill.

To claim losses at all, you need records: a contemporaneous log of each session with the date, type of gambling, the establishment, who was with you, and amounts won or lost, plus supporting documents like W-2Gs, wagering tickets, canceled checks, and bank withdrawal slips.⁹ Reconstructing a year from memory at filing time is the fastest way to lose the deduction in an audit.

1
Internal Revenue Service. Instructions for Forms W-2G and 5754 (01/2026)
2
Internal Revenue Service. Topic no. 419, Gambling Income and Losses
3
Internal Revenue Service. About Form W-9, Request for Taxpayer Identification Number and Certification
4
Internal Revenue Service. About Form W-2 G, Certain Gambling Winnings
5
Internal Revenue Service. Form W-9 (Rev. March 2024)
6
Internal Revenue Service. About Backup Withholding
7
Internal Revenue Service. About Form 5754, Statement by Person(s) Receiving Gambling Winnings
8
Internal Revenue Service. Schedule 1 (Form 1040) – Additional Income and Adjustments to Income
9
Internal Revenue Service. Diary or Similar Record