A casino win/loss statement is useful for your taxes, but only as a backup document. The IRS does not accept it as sufficient proof of gambling losses on its own, and relying on one without your own records is the fastest way to lose a deduction in an audit. You still need a contemporaneous diary of your play, and even with perfect records, a 2026 rule change limits your deductible losses to 90% of what you actually lost, capped at your total winnings for the year.1Office of the Law Revision Counsel. 26 U.S. Code 165 – Losses
What a Win/Loss Statement Is and Why It Falls Short
A win/loss statement is a year-end summary that a casino or online gaming platform generates from your loyalty or rewards card activity. It reports your total wagers, total payouts, and a net win or net loss figure for the tax year. Most casinos make these available by request early in the following year.
The statement is only as complete as your card usage. Every hand of blackjack where you forgot to swipe your card, every cash bet at a craps table, every slot session played without your player card inserted is invisible to that report. What the casino’s computer tracked is often less than what you actually wagered.
The other problem is granularity. The IRS wants session-level detail: how much you won or lost on a given date, at a specific game, in a specific location. A win/loss statement typically gives you one lump number for the entire year, or at best monthly totals. That level of aggregation does not meet IRS documentation standards if your return is audited.
Keep the statement anyway. It works as corroborating evidence. When your personal records show a $8,000 loss at a particular casino and the casino’s own statement backs that up, you have a stronger position than either document alone. The statement supports your case. It cannot carry it.
The Records the IRS Actually Wants
The IRS requires a detailed, contemporaneous diary or log of your gambling activity. “Contemporaneous” is the operative word. A spreadsheet built the night before an audit carries far less weight than notes recorded at or near the time of play. Your diary needs to include, at a minimum:2Internal Revenue Service. Publication 529 – Miscellaneous Deductions
- The date and type of gambling (slots, blackjack, sports betting, and so on)
- The name and address of the casino, racetrack, or platform
- How much you won or lost during each session
- Names of anyone with you at the gambling establishment
Beyond the diary, keep supporting documents that confirm your entries: Form W-2G copies, wagering tickets, payment slips, canceled checks, credit card records, and bank withdrawal statements showing funds used for gambling.3Internal Revenue Service. Topic No. 419, Gambling Income and Losses For online sportsbooks and casino apps, export your transaction history regularly. Most platforms let you download CSV files or detailed account statements. Even so, keep your own diary alongside them, because platform records may not capture everything the IRS asks about, like who was present or how a session mixed different bet types.
The IRS also expects records tailored to the game. For slots, note the machine number and time. For table games, note the table number and any casino credit issued in the pit or at the cage. For lotteries and racing, hold on to purchase records and unredeemed tickets.2Internal Revenue Service. Publication 529 – Miscellaneous Deductions
The 90% Cap on Deductible Losses
This is the rule that surprises people. Federal law now limits the gambling loss deduction to 90% of your actual losses, and that reduced amount can only offset gambling winnings, not other income.1Office of the Law Revision Counsel. 26 U.S. Code 165 – Losses Even breaking exactly even at the casino now leaves you with taxable income.
Say you won $10,000 and lost $10,000 across the year. You report $10,000 in gambling income. Your allowable deduction is 90% of $10,000, which is $9,000. That leaves $1,000 of taxable gambling income with no deduction to offset it. If your losses were $15,000 against the same $10,000 in winnings, 90% of $15,000 is $13,500, but the deduction is still capped at the $10,000 of winnings you reported. Gambling losses cannot reduce your wages, investment income, or any other income.
Losses that exceed your winnings for the year are gone. There is no carryforward to future tax years.
You Have to Itemize to Use the Deduction at All
Even with a perfect diary and matching casino statement, you can only claim the gambling loss deduction if you itemize on Schedule A instead of taking the standard deduction.3Internal Revenue Service. Topic No. 419, Gambling Income and Losses For 2026, the standard deduction is $16,100 for single filers, $32,200 for married couples filing jointly, and $24,150 for heads of household.4Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
If your mortgage interest, state and local taxes, charitable contributions, and gambling losses added together don’t exceed the standard deduction, claiming gambling losses does nothing for your tax bill. You still owe tax on every dollar of your winnings. A $3,000 jackpot is fully taxable; the $3,000 you lost chasing it may produce no relief at all.
All Winnings Are Taxable, Reported or Not
The IRS treats gambling winnings like wages or investment income. You report them on Schedule 1 of Form 1040 under “Other Income,” regardless of amount and regardless of whether anyone sent you a tax form.3Internal Revenue Service. Topic No. 419, Gambling Income and Losses Cash winnings from casinos, sportsbooks, poker games, lotteries, and online platforms all count. Non-cash prizes like cars, vacations, or electronics count too, at fair market value.5Internal Revenue Service. Schedule 1 (Form 1040) – Additional Income and Adjustments to Income
Receiving a Form W-2G is the casino’s reporting job. Reporting the income is yours. A $500 slot win with no W-2G is still $500 of taxable income.
What Happens If You Rely on the Statement Alone
If you claim $8,000 in gambling losses backed only by a casino win/loss statement and no diary, the IRS can disallow the entire deduction in an audit. You then owe back taxes on that $8,000, plus an accuracy-related penalty of 20% of the underpaid tax if the IRS finds negligence or a substantial understatement.6Internal Revenue Service. Accuracy-Related Penalty A “substantial” understatement is one that exceeds the greater of 10% of the tax that should have been on your return or $5,000.
On top of that, any unpaid tax accrues a failure-to-pay penalty of 0.5% per month, up to a maximum of 25%, plus interest that compounds daily.7Internal Revenue Service. Failure to Pay Penalty Interest runs from the original due date of the return. The total hit adds up quickly, and it is entirely avoidable with records kept as you play rather than reconstructed later.
Professional Gamblers and State Taxes
If gambling is your primary income and you pursue it regularly to profit, the IRS may classify you as a professional gambler. Professionals report on Schedule C and can deduct business expenses like travel, lodging, and supplies. The trade-off: self-employment tax of 15.3% on net earnings, and the 90% cap still applies.8Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The statute defines “losses from wagering transactions” to include business expenses tied to gambling, so travel, subscriptions, and other costs all sit under the same 90% ceiling.1Office of the Law Revision Counsel. 26 U.S. Code 165 – Losses
State tax rules are separate and vary. Most states with an income tax also tax gambling winnings, some do not allow any deduction for losses, and a state where you gambled but don’t live may withhold tax on winnings paid there. Check the rules for each state where you played.