0DTE Options Explained (2026)

0DTE stands for zero days to expiration — options contracts that expire the same day you trade them. They became widely accessible once major indices, especially the S&P 500 (SPX), gained options expiring every trading day of the week.

Because there is so little time left, a 0DTE option has almost no time value and reacts very sharply to moves in the underlying. A small index move can multiply or wipe out the premium within minutes — which is exactly why some traders love them and risk managers warn about them.

0DTE options now make up a large share of total S&P 500 options volume. The appeal is obvious: they are cheap (little premium), offer defined risk when bought, and let traders express a same-day view without overnight exposure or holding cost.

They also suit the modern, fast, screen-based retail trader — and the growth of daily expirations across indices and some ETFs has turned what was once a quarterly event into an everyday strategy.

Buyers use 0DTE calls/puts for cheap, high-leverage directional bets on intraday moves — accepting that the option likely expires worthless if wrong. Premium sellers use credit spreads and iron condors to collect the rapid time decay on range-bound days, with defined risk if structured with protective legs.

The defining variable is gamma: near expiration, an option’s delta changes violently as price approaches the strike, so positions can swing from profit to loss (or vice versa) in seconds. 0DTE is a timing and risk-management game, not a buy-and-hold one.

The same features that make 0DTE attractive make it dangerous. Time decay is brutal — a long 0DTE option can lose its entire value in a session. Gamma risk means short positions can blow past your expected loss fast around the strike. And liquidity and slippage can be punishing in fast markets.

Selling 0DTE options without defined-risk protection exposes you to outsized losses from a sudden move. Most who lose at 0DTE do so by oversizing and ignoring the decay clock. Defined-risk structures and tiny position sizes are the only sane starting point.

For traders who want to trade 0DTE-style strategies on buying power rather than their own capital, funded options trading is now possible. Vanquish Trader funds equity options directly, and options on futures (e.g. on the S&P 500) at firms like Topstep offer a similar same-day approach. Firm consistency rules can clash with all-or-nothing 0DTE bets, so read them first.

This is educational, not financial advice. 0DTE options are among the highest-risk instruments available to retail traders. Most people should paper-trade the mechanics first, and never risk money — personal or a prop-firm fee — that they cannot afford to lose.