Tax-loss harvesting with Kalshi
Tax-loss harvesting, deliberately realizing losses to offset gains, is a familiar move for stock investors. Whether and how it applies to Kalshi depends on which tax treatment your event-contract gains fall under, which is itself unsettled.
This guide explains the interaction. It is educational, not tax advice.
- The idea is simple: realized losses can offset realized gains, lowering your taxable total.
- Under capital-style or Section 1256 treatment, losses net against gains in the normal way, so harvesting works much as it does for other instruments.
- For securities, the wash-sale rule disallows a harvested loss if you rebuy within 30 days.
- ContractTax shows your realized gains and losses clearly and computes your result under each treatment, so you and your preparer can see what harvesting would actually save before acting.
What tax-loss harvesting is
The idea is simple: realized losses can offset realized gains, lowering your taxable total. If you're sitting on a losing position and have gains elsewhere, closing the loser can reduce your bill.
How much it helps, and whether the usual rules apply, depends on how your Kalshi income is classified.
It depends on your treatment
Under capital-style or Section 1256 treatment, losses net against gains in the normal way, so harvesting works much as it does for other instruments. Under gambling treatment, the new post-2025 cap limiting loss deductions to 90 percent of winnings changes the math and can blunt the benefit.
So the value of harvesting is tied to the treatment you and your preparer take.
The wash-sale wrinkle
For securities, the wash-sale rule disallows a harvested loss if you rebuy within 30 days. Whether that rule even reaches Kalshi event contracts is unsettled, and if your contracts are treated as Section 1256, they're generally exempt from wash-sale rules entirely.
That likely gives prediction-market traders more flexibility than stock investors, but unsettled means unsettled, so don't assume.
Where ContractTax fits
ContractTax shows your realized gains and losses clearly and computes your result under each treatment, so you and your preparer can see what harvesting would actually save before acting.
It is educational software, not tax advice. Harvesting decisions belong with a professional.