Tax basics for bettors — what every winning year needs

This article is general information, not tax advice. Nothing here is a substitute for a professional who knows your return, your state, and your numbers. Tax law changed meaningfully for 2026, the change is unfavorable to bettors, and the details are the sort that cost real money when guessed at. If you had a winning year, the single most valuable thing in this lesson is the instruction to talk to a CPA who has handled betting income before.

With that said, here is the shape of the thing, so you know what to bring to that conversation.

Winnings are income whether or not a form shows up

US federal tax treats betting winnings as taxable income. This does not depend on receiving a form, on withdrawing to your bank, or on ending the year up. The absence of a Form W-2G changes nothing about the obligation.

Most sports bets never generate a W-2G. That is a reporting threshold for the payer, not a taxability threshold for you. A year of small winning bets that never triggered a single form is still a year of reportable income.

Recreational bettors report winnings as other income. Losses are handled entirely separately, which is where most of the pain lives.

Losses are only deductible against winnings, and only if you itemize

Three constraints stack here, and every one of them catches people.

You cannot net. IRS Publication 529 is explicit: "You can't reduce your gambling winnings by your gambling losses and report the difference. You must report the full amount of your winnings as income and claim your losses (up to the amount of winnings) as an itemized deduction." Your $40,000 of winning bets and $37,000 of losing bets are not $3,000 of income. They are $40,000 of income and a $37,000 deduction that may or may not be available.

You must itemize. The loss deduction lives on Schedule A. If you take the standard deduction — as most filers do — you get no benefit from your losses at all. For a bettor with high volume and a modest net, this alone can produce a tax bill larger than the profit.

Losses cannot exceed winnings. There is no net gambling loss for a recreational bettor, and no carryforward to a future year.

The 2026 change: the 90% limit

Effective for tax years beginning after December 31, 2025, the One Big Beautiful Bill Act amended IRC §165(d) so that only 90% of losses may be deducted, and still only up to the amount of winnings.

The worked example, using KPMG's illustration: report $10,000 in winnings and $8,000 in losses, and the deductible amount is 90% of $8,000 = $7,200. Taxable gambling income is $2,800, despite actual net winnings of $2,000. You are taxed on $800 you did not make.

The mechanic generalizes badly for high-volume bettors. The disallowed 10% scales with gross losses, not with net profit, so the more volume you run, the larger the phantom income — even in a break-even year.

The limitation applies to professionals as well, and reaches beyond direct losses to expenses incurred in carrying on wagering activity.

Repeal efforts exist. The FAIR BET Act (H.R. 4304), the WAGER Act (H.R. 4630) and the FULL HOUSE Act (S. 2230) have all been introduced, and a Senate unanimous-consent attempt was blocked in July 2025. As of this writing, none has passed and the 90% limit is in effect. That status can change; check it at filing time rather than assuming.

Session accounting

If every individual bet were its own taxable event, the reporting burden would be absurd and the itemizing problem catastrophic. In practice, a session-based approach is generally accepted, at least for casino-style play.

The IRS addressed this in memorandum AM 2008-011, which measures gains and losses over a session of play rather than per wager, and the Tax Court accepted that methodology in Shollenberger, T.C. Memo 2009-306. The same case rejected netting across a whole year: the session is the unit, not the tax year.

What a "session" means for online sports betting, where wagers resolve over hours or days across multiple books, is genuinely less settled than it is for a slot machine. This is a question for a CPA, not an article.

W-2G thresholds and withholding

Two separate mechanics, frequently confused.

Reporting. For 2026, the minimum reporting threshold rose to $2,000, adjusted annually for inflation after 2026. For a sportsbook wager, the payer files a Form W-2G when winnings are at least $2,000 and at least 300 times the amount wagered. Both conditions have to hold, which is why ordinary point-spread and moneyline bets almost never generate one.

Withholding. Under §3402(q), the rate applicable to winnings of $5,000 or more from sweepstakes, wagering pools, certain parimutuel pools, jai alai, lotteries, and sports wagering is 24%, applying when winnings net of the wager exceed $5,000 and are at least 300 times the wager. Backup withholding, applied when a correct taxpayer identification number is not furnished, is also 24%.

Withholding is not the tax. It is a prepayment. If 24% was withheld and your marginal rate is higher, you owe the difference; if lower, it comes back at filing.

The records that make this survivable

Publication 529 asks for a contemporaneous log containing, at minimum:

The date and type of the specific wager or wagering activity
The name and address or location of the establishment
The names of other persons present with you
The amounts you won or lost

It also asks for corroborating documentation — W-2Gs, wagering tickets, canceled checks, and operator records.

That is very close to a description of the bet log you should already be keeping: one dated row per wager, with the book, the market, the stake, the price, and the result, written the same day rather than reconstructed in April. The gap most bettors have to close is the books they use rarely — those are the bets that go unlogged.

One thing worth doing before the year ends rather than in April: download annual statements from every book you used, including books you no longer use, and reconcile them against your own log. Operator statements and personal logs disagree more often than you would expect, usually over voided bets, promo credits, and bonus funds.

State treatment varies, and sometimes badly

State income tax on betting winnings does not follow the federal rules automatically. Some states allow a loss deduction that mirrors the federal one. Some tax gross winnings and allow no deduction for losses at all, which can produce a state tax bill on a losing year. Some have no income tax and the question does not arise. Rules also differ for winnings earned in a state you do not live in, which can mean filing a nonresident return.

The spread between the best and worst state outcomes for the same betting record is large enough that it is worth knowing your own answer specifically rather than generally.

Professional versus recreational

The professional classification is not something you elect. It is a facts-and-circumstances determination, and the standard comes from Commissioner v. Groetzinger, 480 U.S. 23 (1987), which held that gambling is a trade or business when the activity is pursued full time, in good faith, and with regularity, for the production of income for a livelihood, and is not a mere hobby.

A bettor who meets that bar files on Schedule C, can deduct ordinary and necessary business expenses, and does not depend on itemizing to get value from losses — but also owes self-employment tax, and is still subject to the 90% limitation, which under the 2026 amendment reaches business expenses as well as the losses themselves.

Claiming professional status without meeting the standard is an expensive mistake. So is failing to claim it when you clearly do meet it. Both are decisions for someone who can see your actual facts.

What to do with this

The short version of a winning year: keep contemporaneous records, download every operator statement, do not assume netting is allowed, do not assume your losses are deductible until you know whether you itemize, and expect the 90% limit to make your taxable gambling income larger than your actual profit.

And to close where this started: this is general information, not tax advice. Tax outcomes turn on details this article cannot see — your filing status, your state, whether you itemize, your volume, and what your operator statements actually say. If you had a winning year, or a high-volume break-even year, engage a CPA who has handled betting income before. That is not a disclaimer. It is the actionable recommendation of the lesson.

Sources verified

IRS, Instructions for Forms W-2G and 5754 (01/2026) — https://www.irs.gov/instructions/iw2g
IRS, Publication 529, Miscellaneous Deductions — https://www.irs.gov/pub/irs-pdf/p529.pdf
KPMG, Gambling losses under the One Big Beautiful Bill — https://kpmg.com/kpmg-us/content/dam/kpmg/pdf/2025/gambling-losses-under-one-big-beautiful-bill.pdf
Journal of Accountancy, Tax Court Accepts IRS Method for Determining Gambling Wins and Losses (AM 2008-011; Shollenberger, T.C. Memo 2009-306) — https://www.journalofaccountancy.com/news/2009/dec/20092454/
Commissioner v. Groetzinger, 480 U.S. 23 (1987) — https://en.wikipedia.org/wiki/Commissioner_v._Groetzinger
Gambling Tax Help, Repeal efforts tracker (H.R. 4304, H.R. 4630, S. 2230) — https://www.gamblingtaxhelp.com/repeal-efforts/
Super Lawyers, Sports Betting Taxes 2026: The New $2,000 W-2G Rule Explained — https://www.superlawyers.com/resources/tax/personal-taxes/sports-betting-tax-w2g-rule/