Gambling Loss Deduction Changes 2026: The 90% Cap That Creates Phantom Income
Gambling loss deduction changes in 2026 cap deductions at 90% of losses. 4 worked examples show the tax hit and how to avoid it.
What Changed: The 90% Gambling Loss Deduction Cap
The One Big Beautiful Bill Act introduced a gambling loss deduction change that took effect January 1, 2026. Gambling losses are now capped at 90% of the amount lost, not 100%. The remaining 10% becomes taxable phantom income that you owe tax on even if you broke even or lost money for the year.
Before 2026, gambling losses could fully offset gambling winnings. Win $10,000, lose $10,000, owe nothing. That math no longer works. Under the new rule, that same trader can only deduct $9,000 of the $10,000 in losses. The remaining $1,000 is taxable at your ordinary income rate.
This matters for prediction market traders because the IRS has not definitively classified event contracts. If your activity is classified as gambling, you are subject to this new cap. If your activity is classified as capital gains or Section 1256 contracts, the cap does not apply. Classification was already important. It is now worth thousands more per year. For the full breakdown of all three classifications, read the event contract tax treatment guide.
The Phantom Income Problem: Worked Example
Here is how the 90% cap creates a tax bill from nothing.
Scenario: Break-even trader classified as gambling
A trader on a prediction market platform wins $25,000 and loses $25,000 during 2026. Net profit: $0.
Before 2026 (old rules, itemizing):
- Gambling winnings: $25,000
- Deductible losses: $25,000 (100%)
- Taxable income from gambling: $0
- Federal tax: $0
After 2026 (new 90% cap, itemizing):
- Gambling winnings: $25,000
- Deductible losses: 90% x $25,000 = $22,500
- Taxable phantom income: $2,500
- Federal tax at 32% bracket: $800
You broke even on your trades and still owe $800 in federal tax. That is a direct wealth transfer caused solely by the classification of your activity. Run the numbers on your own trades through the Fee Calculator to see how fees already eat into your edge before this tax hit compounds the damage.
The phantom income scales linearly with your losses. Lose $50,000 and win $50,000, the phantom income is $5,000, creating a $1,600 federal tax bill (at 32%) on zero actual profit.
Who Gets Hit: Classification Determines Everything
The 90% cap applies only to income classified as gambling income. Two other classifications exist for prediction market activity, and neither is affected.
| Classification | Loss Treatment (2026) | Phantom Income? | Who It Applies To |
|---|---|---|---|
| Section 1256 (60/40) | Full offset + 3-year carryback | No | CFTC-regulated DCM trades |
| Short-term capital gains | Full offset + $3K/yr carry forward | No | Capital asset treatment |
| Gambling income (itemizing) | 90% of losses, capped at winnings | Yes, 10% of losses | Anyone classified as gambler |
| Gambling income (standard deduction) | $0 deduction | Yes, 100% of losses | Gamblers who don't itemize |
The bottom row is the worst outcome. If your activity is classified as gambling and you take the standard deduction (as most Americans do), you cannot deduct any losses at all. You pay tax on gross winnings, not net profit.
This is not theoretical. Our prediction market tax guide covers a scenario where a trader with $15,000 in winning trades and $12,000 in losing trades owes $960 under capital gains treatment but $4,800 under gambling treatment with the standard deduction. The 90% cap adds phantom income even for those who do itemize.
Section 1256 and Capital Gains Are Not Affected
This point deserves its own section because it is the most important distinction. The 90% gambling loss deduction cap does not touch Section 1256 contracts or capital gains treatment.
Section 1256 contracts: Losses offset gains dollar for dollar. Section 1256 also provides a three-year loss carryback. If you lost $20,000 in 2026 on Section 1256 contracts, you can amend your 2025, 2024, or 2023 returns to offset Section 1256 gains in those years and receive a refund. No cap. No phantom income. No requirement to itemize.
Capital gains treatment: Losses offset gains dollar for dollar on Schedule D. If net losses exceed gains, you can deduct up to $3,000 per year against ordinary income and carry the remainder forward indefinitely. No cap. No phantom income. No requirement to itemize.
Gambling income (post-2026): Losses only offset gambling winnings. Only available if you itemize on Schedule A. Capped at 90% of losses. Cannot create a net loss. Cannot carry losses forward or back. 10% of every dollar you lose becomes phantom taxable income.
The spread between classifications was already significant. The 90% cap made it wider.
Gambling vs Capital Gains: Side-by-Side Tax Bills
Here is what a full year of trading looks like under each classification. Assume a trader in the 32% federal bracket who takes the standard deduction.
Trader A: $40,000 in wins, $30,000 in losses
| Classification | Taxable Amount | Federal Tax | Effective Rate on Net Profit |
|---|---|---|---|
| Section 1256 | $10,000 net (60/40 split) | $2,180 | 21.8% |
| Capital gains | $10,000 net | $3,200 | 32% |
| Gambling (itemizing, 90% cap) | $40,000 - $27,000 = $13,000 | $4,160 | 41.6% |
| Gambling (standard deduction) | $40,000 | $12,800 | 128% |
Under gambling treatment with the standard deduction, this trader pays $12,800 in taxes on $10,000 of actual profit. The effective rate exceeds 100%. The taxes are greater than the gains.
Under gambling treatment while itemizing, the 90% cap means only $27,000 of the $30,000 in losses is deductible (90% x $30,000). The remaining $3,000 becomes phantom income, pushing taxable gambling income to $13,000 instead of $10,000.
Trader B: $20,000 in wins, $20,000 in losses (break-even)
| Classification | Taxable Amount | Federal Tax |
|---|---|---|
| Section 1256 | $0 | $0 |
| Capital gains | $0 | $0 |
| Gambling (itemizing, 90% cap) | $2,000 | $640 |
| Gambling (standard deduction) | $20,000 | $6,400 |
A break-even trader classified as a gambler who itemizes owes $640 in federal tax. A break-even trader classified under capital gains owes nothing.
The Standard Deduction Makes It Worse
The One Big Beautiful Bill Act also raised the standard deduction. For 2026, the standard deduction for single filers increased to approximately $16,900 (up from $15,000 in 2025). Married filing jointly increased to approximately $33,800.
This sounds like a benefit, and it is for most taxpayers. But for traders classified as gamblers, it is a trap. Here is why.
Gambling losses are an itemized deduction on Schedule A. You can only claim them if your total itemized deductions exceed the standard deduction. With a higher standard deduction, fewer traders will find it worthwhile to itemize. If you do not itemize, you cannot deduct any gambling losses at all.
Consider a single filer with $16,000 in total itemized deductions (state taxes, mortgage interest, and $8,000 in gambling losses). Under the new standard deduction of $16,900, itemizing saves them nothing. They take the standard deduction and lose the ability to deduct any gambling losses. Their full $8,000 in gambling winnings is taxable with zero offset.
Under capital gains treatment, this is irrelevant. Capital losses offset gains on Schedule D regardless of whether you itemize. The deduction mechanism is completely different.
How to Strengthen Your Case for Non-Gambling Classification
The 90% cap makes it more valuable than ever to ensure your prediction market activity is not classified as gambling. Here are the factors that matter.
Trade on CFTC-regulated platforms. Kalshi operates as a CFTC-regulated designated contract market (DCM). DraftKings and FanDuel route through CME Group. Robinhood and Coinbase route through Kalshi's infrastructure. These platforms have the strongest case for Section 1256 or capital gains treatment because they function as regulated financial exchanges, not gambling operators.
Maintain records that look like trading, not gambling. Keep spreadsheets tracking entry price, exit price, position size, expected value calculations, and your thesis for each trade. Document your prediction market strategy. Traders keep records. Gamblers do not.
Use multiple analytical tools. Running contracts through an EV calculator before trading, tracking fees, and applying position sizing rules all support the argument that you are trading, not gambling. The are prediction markets gambling analysis breaks down the three structural tests that separate traders from gamblers.
Avoid platforms without regulatory structure. Polymarket operates globally without CFTC oversight. Gains from Polymarket are harder to classify as anything other than capital gains or gambling. If you trade on Polymarket, the capital gains argument is stronger than the gambling argument, but neither is guaranteed.
Consult a tax professional who understands derivatives. The classification question involves interpreting the Commodity Exchange Act, CFTC regulations, and IRS code sections that most general-practice CPAs have never encountered. At portfolio sizes above $10,000 in annual gains, a specialist pays for itself.
What This Means for Your After-Tax Edge
The 90% gambling loss deduction cap changes the math on every trade. If there is any chance your activity gets classified as gambling, your true expected value is lower than you think.
A contract with a 5% mathematical edge (buy at $0.50 with 55% true probability) generates an expected profit of $0.05 per dollar risked before taxes. After the 90% cap and gambling classification, your after-tax edge shrinks because losses are not fully deductible.
Over 100 trades at $100 each:
- Expected wins: 55 trades x $50 profit = $2,750
- Expected losses: 45 trades x $50 loss = $2,250
- Net expected profit: $500
- Under capital gains (32%): Tax on $500 = $160. After-tax profit: $340
- Under gambling (itemizing, 90% cap): Deductible losses = $2,025 (90% x $2,250). Taxable = $725. Tax at 32% = $232. After-tax profit: $268
The gambling classification with the 90% cap costs you $72 per 100 trades in this scenario. That is 21% of your after-tax profit, taken purely by a classification difference. At higher volumes, this compounds. Factor the tax treatment into your bankroll management from the start.
Frequently asked questions
- What is the gambling loss deduction change in 2026?
- The One Big Beautiful Bill Act capped gambling loss deductions at 90% of losses starting January 1, 2026. Previously, gambling losses could fully offset gambling winnings. Now, 10% of your losses become phantom taxable income even if you broke even.
- Does the 90% gambling loss cap apply to prediction market trades?
- Only if your prediction market activity is classified as gambling income. Trades classified under Section 1256 or capital gains treatment are not affected. The classification depends primarily on whether you trade on a CFTC-regulated platform like Kalshi.
- How do I avoid the 90% gambling loss deduction cap on event contracts?
- Trade on CFTC-regulated platforms (Kalshi, DraftKings, FanDuel, Robinhood via Kalshi) to support a Section 1256 or capital gains classification. Maintain trading records, document your strategy, and consult a derivatives tax specialist.
- What is phantom income from the gambling loss cap?
- Phantom income is the 10% of gambling losses you can no longer deduct. Win $10,000 and lose $10,000, you owe tax on $1,000 because only $9,000 of losses is deductible. Under capital gains or Section 1256 treatment, the full $10,000 in losses offsets gains and no phantom income exists.
- Does the increased standard deduction help or hurt prediction market traders?
- It depends on classification. For traders classified under capital gains, it is neutral because losses are deducted on Schedule D regardless. For traders classified as gamblers, the higher standard deduction makes it less likely you will itemize, meaning you may lose the ability to deduct any gambling losses at all.