KALSHI 1099-B: Tax Basics for KALSHI Traders

How Kalshi reports and the role of 1099-B

Kalshi operates as a CFTC-regulated US venue with USD settlements, and tax reporting follows general tax principles for securities and regulated derivatives. Kalshi itself issues tax-related documents as part of the year-end process, and traders should expect that gains and losses from YES and NO contracts flow through cost basis and capital gain calculations. The exact form and timing can depend on your broker, your state, and the specifics of each contract resolution, so keep copies of trade confirmations and settlement notes for the year you file.

Your 1099-B-like information (if provided) will reflect the cash settlement value at the time of sale or close, not the notional exposure during the contract’s life. Since each contract settles to 1.00 USD for the winning side, taxable events align with realized gains or losses when you liquidate or close positions, subject to your tax treatment as a trader. If you hold multiple legs or participate in families of child markets, document the timing of each close to support accurate cost-basis calculation.

Gains, losses, and cost basis for YES/NO contracts

A successful Kalshi trade results in a difference between your entry price and the settlement outcome, typically treated as a capital gain or loss. The cost basis is your total amount paid for the contract during entry, including any fees, and the sale/settlement value is the amount you receive if the contract resolves in your favor. Because prices are quoted in cents and often fluctuate near the $0.50 mark, keep precise records of each fill price and any fees charged. Your tax treatment can vary if you are classified as an investor versus a trader for tax purposes, which affects how you report gains, losses, and potentially mark-to-market considerations.

Timing, forms, and how to prepare per year

Tax year timing follows the standard calendar year for most US traders. Form issuance timing can vary; brokers sometimes issue 1099-Bs or alternative statements that summarize gains and losses. Even if a 1099-B isn’t issued, you are still responsible for reporting your Kalshi activity if it creates taxable events. Maintain a running ledger of trades, including trade date, contract ticker, price, fees, and settlement amount, and reconcile with any year-end statements Kalshi or your broker provides. If you have significant activity, consult your accountant on how to report complex baskets of Kalshi positions and whether any special treatment applies.

How KalshiArb helps with tax-aware trading costs

KalshiArb focuses on intra-market arbitrage edges, including YES/NO spreads, and provides price alerts and execution tools to help you manage edge costs. While we don’t provide tax advice, understanding your realized gains and the related costs from frequent arbitrage activity is important for accurate reporting. Use our alerts to optimize entry prices and minimize bid-ask costs, which in turn can simplify your cost-basis reconciliation at year-end.