Zero-Days-to-Expiration Options (0DTE)

A zero-days-to-expiration option is a listed option contract being traded on the day it expires. The Securities and Exchange Commission uses the phrase in its own rule filings, describing "short-dated option ('SDO') contracts, including those traded on the day of their expiration ('zero-days-to- expiration' or '0DTE' options)". Both names appear in the same sentence, which is why this page carries both: 0DTE is the market's shorthand and zero-days-to-expiration is what it stands for.

The label describes a moment rather than an instrument. Every listed option spends its final trading day as a 0DTE contract, and the rights and obligations are exactly those of any other option on the same underlying at the same strike. What made the term worth having is that expirations became continuous: once index options expire on every trading day, a trader who wants a contract with hours of life left can find one every morning, which was not true when a given index option expired once a month.

The market did not decide to create same-day options; it added expiration dates until every day was one. The SEC's order recounts the sequence: in 2005 Cboe began listing weekly options on the S&P 500 index expiring each Friday of the month; in 2016 it introduced Monday and Wednesday weekly expirations; and in 2022 it added Tuesday and Thursday. The order describes the result as options "now expiring on every trading day of the year". Nothing about a single contract changed. The calendar filled in around it.

The scale is documented in the same order, and it is the reason clearing regulators took an interest. OCC's average daily cleared volume increased steadily after 2018 and doubled by 2022, reaching more than 40 million cleared contracts, a significant portion of them short-dated. In a study of trading between February and July 2023, options with less than one month to expiration contributed around 30 percent of daily volume across the days examined, and on the expiration dates themselves the figure for 0DTE options reached 40 percent. These are the Options Clearing Corporation's own figures as recited by the SEC, and they describe volume, not the number of people trading.

What is actually different about the last day is that there is no later. An option's price has two parts: what the right is worth if exercised now, and what it might become before it expires. The second part is what a buyer is paying for time, and on expiration day there is almost none of it left to buy. A position that is out of the money at the close is worth nothing, with no intervening session in which the view could come good. That compresses an ordinary options outcome into hours and makes the size of a move matter far less than its timing.

The clearing system's response was a margin change, and it is easy to mis-describe. OCC collects margin at the start of each business day using its STANS calculation, which is based on end-of-day positions from the previous trading session, so it captures neither overnight nor intraday activity. A position opened and closed inside one session leaves no trace in the numbers the margin call was built from. To close that gap, OCC adopted an Intraday Risk Charge, approved by the SEC in April 2025, calculated monthly from the average of the previous month's daily peak intraday risk increases. The charge is not a 0DTE rule: the order states that the calculation "would capture all products that OCC clears, including SDOs and 0DTE options". It also sits between OCC and its clearing members, not between a broker and a customer. The customer-side rules, which FINRA is replacing with intraday margin standards, are covered under day trading.

Tax treatment turns on what the option is written on, and this is the part most likely to be stated wrongly. Under IRC 1256, a section 1256 contract is marked to market at year end and any gain or loss is treated as 60 percent long-term and 40 percent short-term regardless of holding period, which is what makes the rule interesting for a contract that lives one day. But the definitions decide who gets it. IRC 1256(g)(3) makes a "nonequity option" any listed option that is not an equity option, and IRC 1256(g)(6) defines an equity option as an option to buy or sell stock, or one whose value is determined by reference to any stock or any narrow-based security index, and says an option on a group of stocks is an equity option "only if such group meets the requirements for a narrow-based security index". So a listed option on a broad-based index is a section 1256 contract and a single-stock option is not. Since same-day expirations are concentrated in index options, a 0DTE trader may be inside the section 1256 regime without having chosen it, and a reader who assumes the treatment follows the strategy rather than the underlying will get it backwards.

A 0DTE position is opened like any other options position: an approved brokerage account, a contract chosen by underlying, strike and expiration, and a premium paid or received. The difference is the deadline. The position either produces intrinsic value by the close or produces nothing, and it is settled that day rather than carried.

A hypothetical, using an index option that settles in cash. Assume an index is at 5,595 in the early afternoon and a same-day call struck at 5,600 is quoted at $3.10 per index unit. The contract covers 100 units, so one contract costs $310 and the breakeven is an index level of 5,603.10 (the 5,600 strike plus the 3.10 premium). Three outcomes:

If the index settles at 5,598, the call is out of the money, expires worthless, and the loss is the whole $310, even though the trader's direction was right by three points.

If the index settles at 5,604, the call is worth 4 index units, or $400, and the position gains $90 ($400 received less the $310 paid).

If the index settles at 5,615, the call is worth 15 units, or $1,500, a gain of $1,190. The same $310 produced a total loss, a small gain and a large one across a range of 17 index points, roughly three tenths of one percent of the index. That leverage is the attraction and it is the risk; nothing about the arithmetic is unique to 0DTE except that it is settled by the closing bell rather than weeks later.

Pros

• The cost of a position is known and capped for a buyer: the premium paid is the most that can be lost on a long call or put.
• A defined one-day horizon can be used to express a view about a single scheduled event, such as an economic release, without carrying exposure afterwards.
• Because expirations are now available on every trading day for some index products, a hedge can be sized to the exact period it is meant to cover rather than to the nearest monthly date.
• Cash-settled index contracts are closed out in cash at expiry, so there is no unwanted stock position to deal with the next morning.

Cons

• There is no recovery period. A view that is correct a day later produces the same result as a view that was wrong, and most out-of-the-money contracts end the session worth nothing.
• The whole premium is at risk over hours, so the pace of loss is far faster than the same position held over weeks, and the frequency of trading multiplies transaction costs and bid-ask spreads.
• Selling these contracts inverts the risk: the premium received is capped and the loss is not, and it can arrive within a single session.
• Tax treatment is not uniform across the strategy. An option on a broad-based index is a section 1256 contract with year-end mark-to-market, while a single-stock option is not, so two positions that look identical to the trader are reported differently.
• Frequent same-day trading is exactly the activity the margin rules are being rewritten around, so an account's own requirements can change without the strategy changing.