Gambling and Sports Betting Tax Guide

All winnings taxable, losses limited: the fundamental asymmetry and the new 90% OBBBA cap

Under IRC Section 61(a), gross income includes "all income from whatever source derived." Gambling winnings are income. There is no de minimis exception, no hobby exemption, and no netting at the transaction level for tax reporting purposes (though session netting applies in specific contexts). A bettor who wins $8,000 across various bets during the year and loses $6,000 has $8,000 in gross income and $6,000 in potential deductions — not $2,000 in net gambling income reported directly.

Prior to 2026, gambling losses were deductible under IRC Section 165(d) to the full extent of gambling winnings. A gambler with $10,000 in winnings and $10,000 in losses could deduct the full $10,000, netting to zero. The One Big Beautiful Bill Act (OBBBA) of 2025, Section [relevant section], amended Section 165(d) to cap the gambling loss deduction at 90% of the taxpayer's gambling winnings for the taxable year, effective for tax years beginning after December 31, 2025.

The 90% cap operates as follows: if a gambler has $10,000 in total winnings and $10,000 in total losses, the maximum loss deduction is 90% of $10,000 = $9,000. The taxpayer has $1,000 of net taxable gambling income even though they broke even economically. At a 24% marginal rate, that is $240 in tax on zero economic gain. For a high-volume gambler with $150,000 in winnings and $140,000 in losses, the pre-OBBBA deduction would have been $140,000 (fully offset); post-OBBBA, the maximum deduction is $135,000 (90% of $150,000), creating $15,000 in taxable gambling income instead of $10,000.

The 90% cap applies to ALL gamblers — casual and professional. Professional gamblers reporting on Schedule C are equally subject to the cap. The cap applies to the aggregate gambling loss deduction for the year, not to individual sessions or transactions. Losses in excess of the 90% cap are permanently disallowed — they do not carry forward to future years.

For casual gamblers, losses are only deductible as an itemized deduction on Schedule A (Line 16, Other itemized deductions). This means the loss deduction is only useful if total itemized deductions exceed the standard deduction ($16,100 single, $32,200 MFJ for 2026). A single filer with $8,000 in gambling winnings, $8,000 in losses, and no other itemized deductions above the standard deduction cannot deduct any losses — they take the standard deduction and pay tax on the full $8,000 of winnings. This is the most punishing scenario: economic breakeven but full taxation on winnings.

All gambling winnings are gross income. Losses deductible only to 90% of winnings (OBBBA 2026+), only as itemized deduction for casual gamblers. No carryforward of excess losses. (IRC §61(a); IRC §165(d) as amended by OBBBA 2025; IRS Pub. 529)

W-2G thresholds, 24% withholding, and session netting under Rev. Proc. 2015-53

Form W-2G (Certain Gambling Winnings) is issued by the payer for specific types of gambling winnings above threshold amounts. The thresholds vary by type of gambling:

Slot machines and bingo: W-2G issued for winnings of $1,200 or more (reduced by the wager for bingo). No mandatory withholding unless the winner fails to provide a TIN (in which case backup withholding of 24% applies).

Keno: W-2G issued for winnings of $1,500 or more (reduced by the wager). Same withholding rules as slots.

Poker tournaments: W-2G issued for net winnings (proceeds minus buy-in) of $5,000 or more. Mandatory 24% federal withholding applies.

All other gambling (table games, sports betting, horse racing, lottery, etc.): W-2G issued for winnings of $600 or more AND at least 300 times the wager. Mandatory 24% withholding applies when proceeds (minus the wager) exceed $5,000.

The 24% mandatory withholding under IRC Section 3402(q) is a flat-rate withholding, not a final tax. The actual tax rate depends on the gambler's total income and marginal bracket. A gambler in the 32% bracket owes an additional 8% at filing; a gambler in the 12% bracket receives a refund of 12% of the withheld amount.

Session netting under Revenue Procedure 2015-53 provides that for electronically tracked slot machine play, a taxpayer may treat an uninterrupted session of play at a single type of electronically tracked game (e.g., slot machines at a single casino) as a single session. At the end of the session, only the net result — net win or net loss — is the reportable amount. This prevents the absurd result of reporting every individual pull of a slot machine as a separate wager. The session concept applies to: (1) electronically tracked games, (2) a continuous, uninterrupted period of play, (3) at a single gambling establishment, (4) on a single type of game. Session netting does NOT override W-2G reporting — if a single spin triggers a $1,200 jackpot, the casino must issue a W-2G even though the net session result might be a loss.

For sports betting, session netting is more complex. Each bet placed on a sports betting app is a discrete wager. Some platforms apply session-like concepts (reporting the net result of a single multi-leg parlay as one event), but the IRS has not issued comprehensive guidance on session netting for mobile sports betting across platforms. The safest approach is to track and report all winnings across all platforms and deduct documented losses (subject to the 90% cap and itemization requirement).

W-2G issued at $1,200 (slots/bingo), $1,500 (keno), $5,000 (poker tournaments), $600 at 300:1+ (other). 24% withholding on proceeds minus wager above $5,000. Session netting applies to electronically tracked games per Rev. Proc. 2015-53. (IRC §3402(q); IRC §6041; Rev. Proc. 2015-53; IRS Form W-2G Instructions)

Casual vs. professional gambler: Schedule 1/A vs. Schedule C and self-employment tax

The distinction between a casual gambler and a professional gambler is based on facts and circumstances, with the controlling precedent being Commissioner v. Groetzinger (480 U.S. 23, 1987). The Supreme Court held that a taxpayer is a professional gambler — engaged in a trade or business — if they pursue gambling activity "full time, in good faith, and with regularity, to the production of income for a livelihood" and not "merely a hobby." Relevant factors include: the amount of time devoted to gambling, the consistency and regularity of the activity, the taxpayer's intent to produce income, and whether gambling is the primary source of livelihood.

Casual gamblers report winnings on Schedule 1, Part I, Line 8b (Gambling income) and losses on Schedule A, Line 16 (Other itemized deductions). They cannot deduct gambling-related expenses (travel, subscriptions, software) except as part of the loss deduction capped at winnings. The 90% OBBBA cap applies to the Schedule A loss deduction.

Professional gamblers report on Schedule C (Profit or Loss from Business). Winnings are gross receipts on Line 1. Losses are deductible as a cost of doing business — but still subject to the 90% OBBBA cap on gambling losses (the cap explicitly applies to Section 165(d) deductions regardless of the schedule). Business expenses — travel to tournaments, poker tracking software, casino meals during play, coaching, subscriptions to analytical services — are deductible on Schedule C in addition to gambling losses. The net profit on Schedule C is subject to self-employment tax (15.3% on the first $184,500 for 2026, 2.9% above that), which is a significant additional tax cost that casual gamblers do not face.

The professional status is a double-edged sword. Benefits: gambling losses and business expenses are deductible above the line (no itemization required), losses up to 90% of winnings offset income without being subject to the standard deduction floor, and business expenses further reduce net income. Costs: net gambling profits are subject to self-employment tax (casual gamblers pay no SE tax on winnings), professional status may attract more IRS scrutiny, and the 90% cap still prevents full loss offset.

For sports bettors, the professional threshold is high. A person who bets on sports as a hobby — even if they bet frequently and use analytical tools — is typically a casual gambler unless they devote full-time hours, derive their livelihood from betting, and operate with a business-like structure (dedicated bankroll, record-keeping, systematic strategy). The emergence of semi-professional sports bettors who use algorithms and spend significant time on research but have W-2 employment creates a gray area that the IRS has not explicitly addressed.

Professional gamblers report on Schedule C and deduct business expenses, but owe SE tax on net profits. Casual gamblers use Schedule 1 (winnings) and Schedule A (losses, itemized only). Both subject to 90% OBBBA loss cap. (Commissioner v. Groetzinger, 480 U.S. 23 (1987); IRC §162; IRC §165(d); IRC §1402)

Sports betting specifics: free bets, parlays, cashout, and multi-platform tracking

Sports betting has created novel tax situations that the Internal Revenue Code was not designed to address. The IRS has issued limited guidance, and many questions remain unresolved. The following reflects current best understanding and practitioner consensus.

Free bets and promotional credits: When a sportsbook offers a "free bet" or "risk-free bet" as a promotion, the IRS treats any winnings from that bet as taxable income. The question is whether the free bet itself has a cost basis that reduces the taxable amount. The predominant view: if the free bet is a true freeplay (you did not risk your own money), the cost basis is $0 and the full payout is taxable. If the promotion is a "risk-free bet" where you placed a real wager and the sportsbook refunds the stake as a free bet after a loss, the refund/free bet may be treated as a reduction of your prior loss rather than new income — but the winnings from the subsequent free bet are fully taxable. Sportsbooks issue W-2Gs based on the payout minus the wager; for free bets, the "wager" may be $0, triggering a W-2G at lower payout amounts.

Parlays: A parlay is a single wager that combines multiple selections. For W-2G purposes, the IRS treats the parlay as one bet — the wager is the amount staked, and the proceeds are the full payout. A $10 parlay that pays $8,000 has proceeds of $8,000 minus a $10 wager = $7,990. If proceeds exceed $600 at 300:1+ odds ($10 wager × 300 = $3,000 threshold), a W-2G is issued. The 24% withholding applies if proceeds minus the wager exceed $5,000. Multi-leg parlays frequently trigger W-2G and withholding because the odds multiplication easily exceeds 300:1.

Cashout (early settlement): Many sportsbooks allow bettors to "cash out" a bet before the event concludes, accepting a reduced payout in exchange for certainty. The cashout amount is the proceeds of the wager. If the cashout minus the original wager exceeds the W-2G thresholds, a W-2G is issued. The timing of income recognition is the cashout date, not the original bet placement date.

Multi-platform tracking: Bettors who use multiple sportsbooks (DraftKings, FanDuel, BetMGM, Caesars, etc.) receive separate W-2Gs and year-end tax summaries from each platform. There is no cross-platform netting — a $5,000 win on DraftKings and a $5,000 loss on FanDuel are reported separately (win as income, loss as itemized deduction). The bettor must aggregate W-2Gs from all platforms, add unreported winnings below W-2G thresholds, report total winnings on Schedule 1, and claim total losses (up to 90% of winnings) on Schedule A. Keep the year-end account summary from each platform as documentation.

Free bet winnings are fully taxable at $0 basis. Parlays are single wagers for W-2G purposes. Cashout proceeds are taxable at settlement. No cross-platform netting — aggregate all platforms for total winnings and losses. (IRC §61(a); IRC §165(d); Rev. Rul. 83-130; IRS Form W-2G Instructions)