0DTE options are option contracts that expire on the same calendar day they are traded. The abbreviation stands for "zero days to expiration." When you buy or sell a 0DTE option, the contract will either be worth something or expire worthless by the end of that trading session—there is no tomorrow.
The term describes a time condition, not a separate product category. Any standard call or put becomes a 0DTE on the morning of its expiration date.
Where 0DTE Options Come From
Until recently, expiration days were weekly events at best. Standard options on major indexes expired every Friday, with monthly expirations carrying most of the open interest.
That changed when the Chicago Board Options Exchange expanded SPX expiration dates to cover every trading day of the week:
| Day | Expiration Available |
|---|---|
| Monday | SPX Monday expiration |
| Tuesday | SPX Tuesday expiration |
| Wednesday | SPX Wednesday expiration |
| Thursday | SPX Thursday expiration |
| Friday | SPX weekly / monthly |
SPY ETF options follow the same daily schedule. Because these expirations exist every day, a trader who wants to operate in 0DTE contracts has the opportunity every single market session—not just at the end of each week.
The volume in these daily expirations has grown sharply. On active trading days, 0DTE contracts now represent more than 40% of total SPX options volume.
Why Traders Use 0DTE Options
Two distinct groups are drawn to 0DTE for opposite reasons.
Premium sellers want to collect time value that decays as fast as possible. An option's time value erodes to zero by expiration—a process called theta decay. On a 0DTE contract, that full erosion happens in a single session. Sellers who collect a credit at open and hold to expiration capture the maximum rate of decay.
Premium buyers want cheap exposure to a large intraday move. A 0DTE call or put can be purchased for a small premium. If the underlying makes a significant directional move before close, that option can multiply several times in value. If it does not, the premium expires worthless. The buyer defines their maximum loss upfront.
The result is that both sides of a trade have a clear motivation, which creates the liquidity and tight bid-ask spreads that make 0DTE markets function efficiently.
How 0DTE Options Behave
The mechanics of 0DTE contracts differ from options with weeks remaining. Three pricing factors explain why.
Theta Is Running at Full Speed
Theta is the daily rate at which an option loses time value. A 30-day option might shed 3–5% of its value per day from theta. A 0DTE option loses 100% of its remaining time value by the close. Every minute you hold a long 0DTE contract, time is working directly against you.
Gamma Is Extremely High Near the Money
Gamma measures how quickly an option's directional sensitivity changes as the underlying moves. Near expiration, gamma spikes on at-the-money strikes. A 10-point move in SPX can shift a contract's delta from 0.20 to 0.80 in minutes.
For sellers, this means a position can move from safely out-of-the-money to deep in-the-money before adjustments are possible. For buyers, it means a well-timed directional trade can pay off quickly.
Vega Is Close to Zero
Vega measures an option's sensitivity to changes in implied volatility. With only hours left, shifts in the broader volatility environment barely affect 0DTE pricing. What matters almost entirely is where the underlying price is relative to the strike right now.
What a 0DTE Trade Looks Like in Practice
Selling a 0DTE put spread on SPX
SPX is trading at 5,000. You believe it will stay above 4,950 through the close.
- Sell the 4,950 put and collect premium
- Buy the 4,920 put to cap your risk
- Net credit: $2.00 per spread
- Maximum loss if SPX closes below 4,920: $28.00
If SPX stays above 4,950 at expiration, both legs expire worthless and you keep the full credit. If it falls through 4,920, you absorb the maximum loss. The outcome is fully resolved by the end of the day.
Buying a 0DTE call on SPX
SPX is at 5,000 at 10:00 AM. You expect an intraday rally.
- Buy the 5,020 call expiring today for $1.50
- If SPX rallies to 5,040 by midday, that call might be worth $3.50–$5.00
- If SPX stays flat or falls, the call decays toward zero by close
The buyer's maximum loss is the $1.50 premium paid. No overnight risk, no margin complexity beyond the premium.
The Risks You Need to Understand
0DTE options amplify certain risks that standard options positions spread out over time.
No recovery window. A 30-DTE position that moves against you still has weeks for the underlying to reverse or for you to manage the trade. A 0DTE position has hours, sometimes minutes. There is no buffer against bad news, poor fills, or unexpected volatility.
Gamma explosions around news events. Scheduled macro events—FOMC announcements, CPI releases, Non-Farm Payrolls—can move SPX 30–50 points in seconds. Short 0DTE positions that appear safe before the announcement can breach max loss before the first trade prints after the data. Many experienced 0DTE traders exit or avoid positions on event days.
High win rate does not equal positive expectancy. A 0DTE iron condor might expire worthless on 80% of trading days. On the 20% of losing days, the loss can wipe out several weeks of collected premium. Evaluating a 0DTE strategy requires looking at the average win, average loss, and frequency of each—not just the percentage of winning trades.
Psychological pressure. A position resolving in hours creates more pressure than one expiring in weeks. Watching a short strike get tested with 90 minutes left is different from the same scenario with three weeks on the clock. Traders who deviate from their plan under this pressure often close positions at a loss that would have expired worthless.
0DTE vs. Standard Options at a Glance
| Factor | 0DTE | 30–45 DTE |
|---|---|---|
| Time remaining | Hours | Weeks |
| Theta decay | 100% by close | 3–5% per day |
| Gamma near the money | Extreme | Moderate |
| Vega sensitivity | Near zero | Significant |
| Adjustment flexibility | Very limited | Multiple opportunities |
| Overnight exposure | None | Present |
Are 0DTE Options Right for You?
0DTE options are not beginner instruments. They require a working understanding of how options are priced, how the Greeks behave near expiration, and how to manage a position under time pressure within a single session.
They are not exclusively the domain of institutional traders either. Retail traders who understand spread mechanics, can monitor positions during market hours, and have clear rules for when to close or accept a loss can trade 0DTE systematically.
If you are newer to options, starting with 30–45 DTE strategies gives you more time to learn and make mistakes without the compressed timeline. Once you understand how spreads behave over multiple weeks, the 0DTE mechanics are an extension of the same principles—just faster.
For deeper coverage including specific strategies, Greeks management, and performance tracking, see the complete 0DTE options guide.
Written by Days to Expiry Trading Team
The Days to Expiry trading team brings together experienced options traders and financial analysts dedicated to helping investors generate consistent income through proven options strategies.
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