0DTE options: what zero-days-to-expiry really means

The lesson in plain words

The same lesson as the slides above, written out in full.

1. 0DTE: options with hours to live

Zero D T E just means zero days to expiry. You buy the option in the morning and it is gone by the closing bell the same day. There is no tomorrow for it. Almost every index and a lot of large stocks now have options that expire every single day. That very short life is the whole story, because it changes how the option moves, and how fast.

• 0DTE means zero days to expiry: the contract expires today.
• There is no overnight, no next week. The clock runs out at the close.
• Every major index and many big names now list options that expire daily.
• That short life changes everything about how the option behaves.

EDUCATION, NOT ADVICE: This explains how 0DTE works. It is not a suggestion to trade it. These are the fastest-moving contracts on the board.

2. Time value falls off a cliff

Part of what you pay for any option is time value, the price of having time on the clock. When there are months left, that value drains slowly. On expiry day it falls off a cliff. By the closing bell there is no time value left at all, so the option is worth only what it is actually worth in the money, and nothing more. Holding a zero D T E option means you are fighting a clock that speeds up as the day goes on.

• Part of an option's price is time value: what you pay for time left.
• Months out, that value bleeds slowly. On the last day it collapses.
• By the close, any time value left is zero: only being right pays.
• Holding a 0DTE option is fighting a clock that speeds up all day.

3. Small move, violent swing

Right near expiry, the option's value hangs on which side of the strike price the market finishes. A move of just a few points in the underlying can flip the option from almost worthless to valuable, or the other way, in a matter of minutes. That is why zero D T E feels so violent. It is close to all or nothing, and it happens fast. Even a quiet looking chart can wipe out a zero D T E position on a small wobble.

• Close to expiry, an option's value hinges on which side of the strike price lands.
• A few points in the underlying can turn a winner into a loser in minutes.
• This sensitivity is why 0DTE feels violent: it is all or nothing, fast.
• A calm-looking chart can still shred a 0DTE position on a small wobble.

4. If you ever touch it, keep the loss defined

If a zero D T E trade ever makes sense for you, the desk rule matters even more than usual. Buy defined risk, never sell naked. When you buy a call or a put, the most you can lose is the premium you paid, and that is it. Selling a zero D T E option without protection exposes you to fast and outsized losses, and it is not something we do. Keep the size tiny, and treat that premium as money you are completely prepared to lose.

• The desk's rule holds double here: buy defined risk, never sell naked.
• Buying a call or put, the most you can lose is the premium you paid.
• Selling a 0DTE option naked exposes you to fast, outsized losses. We do not do that.
• Position tiny. Treat the premium as money you are fully prepared to lose.

THE ONE RULE: If a 0DTE trade ever makes sense, it is as a small, long, defined-risk position where the premium is the entire risk. Never as a naked short.