What Are 0DTE Options? The Complete Beginner's Guide

Zero-days-to-expiration (0DTE) options are financial derivative contracts that expire on the exact same day they are traded.

Over the last several years, they have grown from a niche institutional tool into a massive force dominating daily market volume.

The Mechanics of Same-Day Expiration

Traditional options contracts are often bought weeks or months in advance, giving the buyer time for their thesis to play out. Because time is a component of an option’s premium (extrinsic value), those longer-dated options have a “buffer” against short-term volatility.

0DTE options have zero time buffer.

When you buy a 0DTE call or put, you are making a highly leveraged, binary bet on the intraday movement of the underlying asset. Because the option expires at the closing bell, the premium consists almost entirely of intrinsic value and immediate implied volatility.

Why Do Traders Use 0DTE Options?

1. High Leverage: A small move in the underlying index (like the SPX) can result in percentage gains (or losses) of 100% to 1,000% on the option premium in a matter of minutes.
2. Event Trading: They are the perfect vehicle for trading macroeconomic events like Federal Reserve rate decisions or CPI data releases, where the market absorbs the news instantly.
3. No Overnight Risk: Because the position is opened and closed within the same trading session, the trader is not exposed to gap-downs or overnight news shocks.

The Risks

0DTE options are exceptionally dangerous for inexperienced traders. The same mechanism that provides massive leverage also guarantees total capital loss if the market does not move exactly as predicted before 4:00 PM EST. The “decay” of the option’s value accelerates exponentially in the final hours of trading.