SPX Options

What Are SPX Options?

SPX options are European-style, cash-settled options on the S&P 500 index. The ticker is SPX, and contracts are traded exclusively on the CBOE. Unlike equity options or SPY (the ETF tracking the S&P 500), SPX options settle to the index value itself, not shares. At expiration, winners receive cash equal to the intrinsic value of the contract.

European-style exercise means SPX options can only be exercised at expiration — no early assignment risk. This distinguishes SPX from American-style options (like SPY), where holders can exercise any time before expiration. For sellers, the lack of assignment risk simplifies position management.

SPX options trade with a multiplier of $100, meaning one contract represents $100 per index point. If SPX is at 4500 and you buy a 4550 call that expires at 4600, the contract settles for $5,000 intrinsic value (50 points × $100).

Why It Matters for Options Traders

SPX options offer three major advantages over SPY and other equity-based alternatives: tax treatment, no assignment risk, and broader expiration availability.

Tax treatment: SPX options receive 60/40 tax treatment under Section 1256. 60% of gains are taxed as long-term capital gains, 40% as short-term, regardless of holding period. For active traders in high tax brackets, this structure offers meaningful savings compared to SPY options taxed entirely as short-term gains.

No assignment risk: European-style exercise eliminates early assignment. You don’t wake up assigned shares from an ITM short option. This is especially valuable for spreads, where assignment on one leg but not the other can create unintended directional exposure.

Daily expirations: In 2022, the CBOE introduced daily SPX expirations (Monday through Friday). This transformed SPX into the primary vehicle for 0DTE trading on the index. Every trading day, fresh SPX contracts expire, providing continuous opportunities for short-dated premium strategies and intraday directional plays.

Track live 0DTE options activity including SPX sweeps and block trades with Options Flow’s real-time scanner.

SPX options are also 10x the notional size of SPY (SPX ~$450,000 vs SPY ~$45,000 per contract at typical levels). This makes SPX more capital-efficient for large portfolios but less accessible for smaller accounts. Many institutions prefer SPX for this reason; retail traders often stick with SPY for flexibility.

Key Characteristics

• Cash settlement: No shares delivered; cash payment at expiration based on intrinsic value
• European exercise: Exercise only at expiration; no early assignment risk
• Broad-based index: Tracks the S&P 500, representing 500 large-cap U.S. stocks
• 60/40 tax treatment: Favorable Section 1256 tax structure for U.S. traders
• Daily expirations: Monday-Friday expirations available, enabling daily 0DTE strategies
• Large notional size: 10x SPY per contract; more capital-efficient but higher per-contract cost
• AM settlement (for 0DTE): SPX 0DTE options settle based on opening prices (AM settlement), not the 4pm close