Zero Days to Expiration (0DTE) Options: Meaning, Strategies, Risks

Zero Days to Expiration (0DTE) refers to option contracts that have reached maturity or their expiry date. These options are traded on the same day the contract expires.

The concept of 0DTE options has gained attention because option premiums can move significantly in the final trading sessions as the underlying asset approaches its settlement price.

In the Indian share market, traders should remember that 0DTEis a descriptive term, not a separate exchange product. The actual availability and expiry schedule of options depend on exchange specifications and regulatory requirements.

Traders participate in 0DTE through eligible short-dated options. However, high volatility on expiry day makes 0DTE riskier than options with longer expiry periods.

This comprehensive guide covers everything you need to know about 0DTE options, including how they work, their characteristics, strategies, risks, and common mistakes to avoid.

What are Options?

Options are derivative contracts that give the buyer the right, but not the obligation, to buy or sell an underlying asset at a predetermined price within the terms of the contract.

A call option gives the buyer the right to buy the underlying asset at the strike price, and a put option gives the buyer the right to sell the underlying asset at the strike price, subject to the terms of the contract. The predetermined price is known as the strike price, while the amount paid by the option buyer is called the premium.

Also Read: What is ITM, ATM, OTM in Call and Put Option?

What are 0DTE options?

0DTE options are exchange-traded derivative contracts that expire on the same day on which they are being traded. The phrase ‘zero days’ means there is no overnight period remaining before expiration.

An option contract with several days remaining for expiry may retain considerable time value. An option with little or no time remaining generally has very little time value in its premium. In such cases, ITM and ATM option strikes may trade closer to their intrinsic value. OTM options are affected by theta decay and trade at a lower value.

Example of 0DTE options:

Nifty 50 options have a weekly expiry on Tuesdays. During the Tuesday expiry session, the contract has no full trading day left until expiration. Therefore, all the Nifty options traded on Tuesday are considered 0DTE options.

In the same way, BSE Sensex options expire on every Thursday. During that Thursday trading session, the contract has zero trading days left until expiration. Therefore, all the Sensex options traded on Thursday are considered 0DTE options.

Also Read: What is Expiry Trading?

How do 0DTE Options Work?

0DTE options work through the same basic rules as ordinary options, but the remaining time to expiry is extremely short. Traders focus on intraday trading opportunities using the 0DTE contracts.

Here is the step-by-step process to understand and trade 0DTE options:

• Select the underlying:

Choose an eligible index or stock with options expiring on the same day.

• Choose the strike price:

Select a call or put option based on your market view and selected strike price.

• Option Premium:

Option buyers pay a premium to purchase the contract, and option sellers are subject to applicable margin requirements to enter into the contract.

• Trade during the day:

The option price changes rapidly as the underlying asset moves. With little time remaining until expiry, even small price movements can significantly affect the premium.

• Monitor time decay:

0DTE options experience fast time decay because the contract has only hours remaining before expiry.

• Manage volatility:

Changes in implied volatility can quickly increase or decrease the option premium, particularly during major market events.

• Exit before expiry:

Traders can sell their purchased option or close their position before the market closes to realise a profit or limit a loss.

• Hold until expiry:

If the position remains open until expiry, the contract is settled in accordance with the applicable exchange rules. For cash-settled index options, settlement is cash-based.

Characteristics of 0DTE Options

0DTE options differ from long-dated options because they have very little time remaining before expiry. Here are the characteristics:

• Same-day expiry:

The option is traded on its expiration day, leaving no full trading day for the position to develop.

• Fast time decay:

Time value decreases rapidly because the contract has almost no remaining life before settlement.

• High price sensitivity:

Small movements in the underlying asset can produce substantial changes in option premiums, particularly near expiration.

• Short trading horizon:

Traders typically take positions based on intraday market expectations rather than longer-term market forecasts.

• High liquidity:

Popular index options can attract significant trading activity around expiry, though liquidity varies across strikes and market conditions.

• Lower premium possibility:

Far OTM options can trade at relatively low premiums because very little time remains for them to become profitable.

What are Directional 0DTE Option Strategies?

Directional 0DTE option strategies depend on a one-sided movement in the underlying asset, which in turn affects the premium.

Here are some directional 0DTE option strategies used by option traders:

Long Call Option Strategy

In a long call strategy, a trader buys a call option when expecting the underlying index or stock to move higher before expiry. In 0DTE trading, the anticipated upward movement must occur quickly because time decay is rapid.

The strategy offers limited downside relative to the premium paid, while profits can increase if the underlying asset moves substantially above the strike price.

Long Put Option Strategy

In a long put option strategy, a trader buys a put option when expecting the underlying index to decline sharply during the expiry session. Since the option has almost no time value remaining, the expected downward movement generally needs to occur quickly.

The maximum loss is usually limited to the premium paid, whereas a sharp decline can generate significant gains.

Bull Call Spread Option Strategy

In a bull call spread, a trader buys a call option at a lower strike and sells another call at a higher strike with the same expiry. They use it when expecting a moderate upward movement.

The strategy limits both potential profit and loss, making it more controlled than simply buying a call option.

Bear Put Spread Option Strategy

In a bear put spread, a trader buys a higher strike put option and sells a lower strike put with the same expiry. They use this strategy when expecting a moderate decline in the underlying index.

The position has defined maximum risk and maximum profit, helping traders manage exposure during highly volatile expiry sessions.

Call or Put Breakout Strategy

In this strategy, a trader buys a call after confirming an upside breakout, or buys a put after confirming a downside breakout on the price chart. Traders generally look for strong price and volume movement before entering. Because 0DTE options react rapidly, strict entry levels, stop losses, and position sizing are essential for controlling risk.

What are Non-Directional 0DTEOption Strategies?

Non-directional option strategies are used when a trader expects the market to trade in a range and believes there is a lower chance of significant upward or downward movement.

Here are some non-directional 0DTEoption strategies used by option traders:

Short Straddle Strategy

In a short straddle strategy, a trader sells an ATM call and an ATM put with the same 0DTE expiry. The strategy aims to profit when the underlying asset remains near the strike price and option premiums decline over time due to time decay.

However, a sharp directional move can lead to substantial losses; therefore, risk management through appropriate risk controls is important.

Short Strangle Strategy

In a short strangle strategy, a trader sells an OTM call and an OTM put option with the same expiry. They expect the underlying to remain between the two strike prices during the session. The strategy can benefit from rapid time decay, but a strong move beyond either strike can cause significant losses.

Iron Condor Strategy

An iron condor strategy combines a bear call spread with a bull put spread using the same expiry. Traders establish a position when they expect limited movement in the underlying asset.

The strategy provides defined maximum profit and maximum loss, making it more controlled than an unhedged short strangle during volatile expiry sessions.

Iron Butterfly Strategy

An iron butterfly strategy combines a short ATM call and a short ATM put with protective call and put options at different strike prices. Traders expect the underlying to remain close to the central strike at expiry.

The strategy offers defined risk but requires careful strike selection because 0DTE prices can change rapidly.

Risk Associated With 0DTE Options

0DTE options carry several risks that can make them unsuitable for beginners and inexperienced traders.

• Fast time decay:

The option can lose substantial value within hours because there is almost no time remaining until expiration.

• High-gamma exposure:

Options close to expiry can become highly sensitive to underlying price movements, leading to rapid changes in delta.

• Sudden premium collapse:

An option premium can decline sharply when the anticipated market movement does not materialise.

• Liquidity risk:

Some strikes may have limited buyers or sellers, making it difficult to enter or exit positions efficiently.

• Naked option-selling risk:

Unhedged option-selling positions can incur substantial losses when the underlying asset moves sharply against the position.

• Capital erosion:

Repeated small losses in short-dated options can accumulate quickly, especially when traders overtrade every expiry session.

Common Mistakes to Avoid in 0DTE Options Trading

Here are some common mistakes to avoid while trading 0DTE options. This can help you participate in 0DTE trading more effectively and manage risk.

• Ignoring time decay:

Traders sometimes focus only on direction and underestimate how quickly an option’s time value disappears.

• Buying cheap options:

Low-premium options can appear attractive but may require an unusually large market movement to become profitable.

• Overtrading:

Frequent trades during expiry can increase transaction costs and expose traders to unnecessary market fluctuations.

• Ignoring liquidity:

Trading illiquid strikes can increase execution costs and make timely exits difficult.

• Holding losing positions:

Traders may continue to hold because they expect a reversal, even though expiry leaves little time for recovery.

• Ignoring event risk:

Important economic announcements or corporate developments can create unexpected volatility during trading sessions.

• Trading without a plan:

Entering positions without defined risk limits can turn short-term trading into uncontrolled speculation.

FAQs

What is a zero-day-to-expiry (0DTE) option?

A zero-day-to-expiry option is an option contract traded on its expiration day. It has no full trading day remaining after that session. 0DTE option premiums can change rapidly because the time value of money declines quickly as the contract approaches expiration.

What is a zero-day option strategy?

A zero-day option strategy is a trading approach involving options that expire on the same day. Traders may use directional or non-directional strategies based on expected price movement, volatility and time decay, while maintaining strict risk management.

What happens if we don’t sell options on the expiry date?

If you do not close an option position before expiry, its outcome depends on whether it has value at expiration and the applicable settlement rules. An OTM option expires worthless, while an ATM option may be settled according to exchange rules.

What happens if I hold my position to expiration?

Holding an option until expiration means its final value is determined by the underlying asset’s settlement price and applicable exchange rules. Buyers can lose the premium if the option expires worthless, while sellers remain exposed to the applicable settlement obligations and risks.

Is 0DTE good for beginners?

0DTE options are generally not ideal for beginners because premiums can change extremely quickly and time decay is intense. New traders should first understand options, the Greeks, volatility, position sizing and risk management before considering short-term expiry trading.