Tax Rules for Poker Tournament and Casual Winnings

Poker winnings are fully taxable under federal law. Whether the money came from a $40 home game, a weekly cash session, an online sit-and-go, or a six-figure tournament cash, the IRS treats it as ordinary income and expects you to report the full amount on your return.¹ Taxes on poker winnings got meaningfully worse starting with the 2026 tax year: a 2025 law change capped the deduction for gambling losses at 90%, which means even a player who broke even for the year can owe federal tax on money they never actually kept.

How Poker Winnings Get Reported

Federal tax law defines gross income as “all income from whatever source derived,” and the IRS reads that to cover gambling winnings of every kind, including winnings no casino or platform ever reported.² Recreational players report winnings on Schedule 1 (Form 1040), Line 8b, labeled “Gambling.”³

You cannot net wins against losses on that line. If you won $4,000 in one session and lost $3,500 in another, the number that goes on Line 8b is $4,000. Losses come off separately as an itemized deduction, and they come with strings attached. Skipping the reporting step is expensive: understating income can trigger a 20% accuracy-related penalty on the tax you underpaid, plus interest.⁴

The 90% Loss Deduction Cap

Recreational players can deduct poker losses only if three conditions are met. You have to itemize on Schedule A rather than take the standard deduction. Your losses can never exceed the winnings you reported, so gambling losses cannot shelter wages or investment income. And starting with the 2026 tax year, you can deduct only 90% of your losses, not the full amount.⁵

That last change came from a July 2025 amendment to Internal Revenue Code Section 165(d), and its effect on break-even players is punishing. Win $10,000, lose $10,000, and you report $10,000 in income but deduct only $9,000. You owe tax on $1,000 of income you never actually pocketed. A player who won and lost $50,000 in the same year faces a $5,000 gap; at a 22% marginal rate, that’s $1,100 in federal tax on a year that ended in the black by exactly zero. The 90% cap also reaches business expenses that professional players deduct against gambling income, so the rule bites recreational and professional players alike.⁵

The itemization requirement is its own trap. The standard deduction for 2026 is high enough that many casual players’ total itemized deductions don’t clear it, which wipes out the loss deduction entirely and leaves winnings fully taxable.¹

W-2G Forms and Withholding at the Cage

Casinos and tournament organizers report large payouts to the IRS on Form W-2G. For poker tournaments, the trigger is net winnings from a single event, meaning the prize minus your buy-in. That reporting threshold dropped to $2,000 starting in 2026, down from the longstanding $5,000, and will adjust annually for inflation going forward.⁶ A player who wins $3,000 in a tournament with a $500 buy-in has $2,500 in net winnings and now gets a W-2G, where the old rules would have generated no form at all.

Reporting and withholding aren’t the same thing. The W-2G kicks in at $2,000 in net tournament winnings, but the casino only withholds federal tax (24%) once net winnings exceed $5,000.⁶ Between $2,000 and $5,000, you get the paperwork but keep the full payout. Above $5,000, expect 24% to leave the cage with the IRS rather than with you. If you can’t or won’t provide a Social Security number when the casino asks, backup withholding of 24% applies regardless of the amount.

Any tax withheld shows up as a credit on your return, reducing your balance due or increasing your refund. Save every W-2G. The IRS already has a copy, and mismatches between their file and your return are one of the more common audit triggers.

The Records You Need to Keep

If the IRS questions your loss deduction, your records are the entire defense. Revenue Procedure 77-29 sets the expected standard: a contemporaneous diary of your poker activity. Contemporaneous is the operative word. A log you reconstruct from memory after an audit notice arrives carries almost no weight. Each diary entry should include:

Date and type of game (cash, tournament, online sit-and-go)
Location, whether a named casino, an online platform, or a private host
The specific amount won or lost for that session
Names of one or two other people present who could confirm the activity

Back the diary with supporting documents: W-2G forms, buy-in receipts, casino player-card statements, bank withdrawals near the venue, credit card charges, and travel or hotel records. For online play, download hand histories and transaction reports at least monthly, because platforms don’t necessarily keep them available forever.

Record each session on its own. The IRS will not accept a single lump entry like “lost about $5,000 this year at the Bellagio.” Without session-level detail, the IRS can throw out your loss deduction entirely and tax you on the full amount of every winning session. The tax code doesn’t define what counts as a session, but the working rule most players use is a single continuous visit to one venue, with a multi-day tournament treated as one session ending when you bust out or collect a prize.

Estimated Taxes After a Big Win

A single tournament cash can pull you into quarterly estimated tax territory even if you’ve never filed anything but a W-2 return before. You generally owe estimated tax if you expect to owe at least $1,000 in federal tax for 2026 after withholding and credits.⁷ A $20,000 win in March with nothing withheld easily clears that bar.

The 2026 quarterly deadlines are April 15, June 15, and September 15 of 2026, and January 15 of 2027.⁸ You can skip the January payment if you file the full return and pay the balance by February 1, 2027.

To avoid an underpayment penalty, pay in at least the smaller of 90% of your 2026 tax or 100% of your 2025 tax. If your 2025 adjusted gross income was above $150,000, the second number rises to 110% of your prior-year tax.⁷ For players whose income swings hard from year to year, the prior-year safe harbor is usually the easier one to hit.

Staking and Backing Deals

Staking arrangements create a reporting problem players often overlook. When someone backs part of your buy-in for a share of the profits, the IRS still treats the entire prize as paid to whoever’s name is on the entry. Win $30,000 and owe your backer half, and the casino still reports you as the recipient of $30,000.

The clean fix is Form 5754, filled out at the casino, which identifies each person sharing the payout. The casino then issues separate W-2G forms allocating the winnings, so the tax follows the money.⁹ Not every casino will accommodate this, especially when the backer isn’t present.

When Form 5754 isn’t available, the fallback is to issue your backer a Form 1099-MISC at year-end for their share. You’ll need their Social Security number (collected on Form W-9) before you pay them out. That shifts the reported income to the backer and reduces the amount taxable to you.

If You Play Poker for a Living

Players who pursue poker as their livelihood may qualify as professionals running a trade or business. The Supreme Court set the standard in Commissioner v. Groetzinger: continuity, regularity, and a primary intent to earn a living.¹⁰ The bar is high. Weekend tournaments alongside a day job almost never meet it.

Professionals file on Schedule C instead of Schedule 1 plus Schedule A. Losses come off winnings directly without itemizing, and legitimate business expenses (travel, coaching, software, home office) become deductible. The 90% loss cap in Section 165(d) still applies, because the statute reaches any deduction incurred in carrying on a wagering transaction.⁵

The cost of professional status is self-employment tax: 15.3% on net earnings, covering Social Security (12.4%) and Medicare (2.9%). For 2026, the Social Security portion applies to the first $184,500 of net self-employment income; the Medicare portion has no ceiling.¹¹ Quarterly estimated payments also become mandatory rather than occasional.

State Taxes Are a Separate Bill

Federal is only half the picture. Most states with an income tax also tax gambling winnings, and state loss-deduction rules diverge sharply from federal ones. Roughly ten states tax gross gambling winnings with no mechanism to deduct losses at all, which means state income tax on every dollar you won regardless of what you lost. About nine states have no income tax, so poker winnings escape state tax entirely.

Even in states that generally follow federal rules, the new 90% federal loss cap may or may not carry over, depending on whether the state uses rolling or fixed-date conformity to the federal code. Players who travel to tournaments across state lines can pick up filing obligations in each state where they won, sometimes without any way to offset those winnings with losses booked elsewhere. State-specific advice is worth getting before the money hits your account, not after.

1
Internal Revenue Service. Topic No. 419, Gambling Income and Losses
2
Office of the Law Revision Counsel. 26 USC 61 – Gross Income Defined
3
Internal Revenue Service. Schedule 1 (Form 1040) 2025
4
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
5
Office of the Law Revision Counsel. 26 USC 165 – Losses
6
Internal Revenue Service. Instructions for Forms W-2G and 5754
7
Internal Revenue Service. Publication 505 (2026), Tax Withholding and Estimated Tax
8
Internal Revenue Service. 2026 Form 1040-ES Estimated Tax for Individuals
9
Internal Revenue Service. Form 5754, Statement by Person(s) Receiving Gambling Winnings
10
Legal Information Institute. Commissioner of Internal Revenue v. Robert P. Groetzinger
11
Social Security Administration. Contribution and Benefit Base