Calendar Spread: Using Time Decay

Understanding Time Decay: The Engine Behind Calendar Spreads

Before diving into the mechanics of a calendar spread, it is worth spending time on the engine that drives the entire strategy - theta, or time decay. Understanding theta deeply is what separates a trader who uses calendar spreads skillfully from one who uses them blindly.

Every option has a time value component embedded in its premium. This time value represents the market's compensation for the uncertainty about where the underlying will be at expiry. All else being equal, an option that has 30 days left to expire will be worth more than the same option with only 5 days left, because the underlying has more time to move in a favourable direction. As those days pass, the time value shrinks - and that shrinkage is measured by theta.

Theta is typically expressed as a negative number for long option positions because time passage hurts option buyers. For a long call with a theta of -5, the option loses approximately ₹5 in premium for every calendar day that passes, assuming everything else remains constant. For the seller of that option, theta is positive - they gain ₹5 per day. This is why option sellers are sometimes called theta farmers: they are harvesting time value day after day.

The crucial insight for calendar spreads is that theta is not linear - it accelerates as expiry approaches. An option with 30 days left decays more slowly per day than one with 7 days left. The decay curve steepens sharply in the final two weeks of an option's life. If you plot time value against days to expiry, you get a curve that is relatively flat far from expiry and then drops steeply near expiry. This non-linear relationship is the mathematical foundation of the calendar spread.

In practical terms on the NSE, consider a Nifty 50 weekly call option expiring this Thursday versus a monthly call option expiring in three weeks on the same strike. The weekly option is in the steepest part of its decay curve - every day, it loses a disproportionately large chunk of its remaining time value. The monthly option is still in the flatter part of the curve. By selling the weekly and buying the monthly, you are essentially positioned on the right side of this decay differential.

Theta is not the only Greek that matters, however. Vega - which measures sensitivity to changes in implied volatility - also plays a significant role. Calendar spreads have a net positive vega when the back-month option is bought and the front-month is sold, meaning the overall position benefits when implied volatility rises and is hurt when it falls. This is because the longer-dated option is more sensitive to vega than the shorter-dated one. This vega exposure means that even if theta is working in your favour, a sharp drop in implied volatility can erode the value of your spread. Understanding this interplay between theta and vega is essential for managing a calendar spread through different market environments.

Delta, the directional measure, is approximately zero or very low for an at-the-money calendar spread at initiation. This near-delta-neutral character is one of the appealing features - you are not primarily making a directional bet. However, delta can shift as the underlying moves, requiring periodic adjustment if the underlying drifts far from the strike.

Gamma, which measures the rate of change of delta, works against the calendar spread when the underlying moves sharply. The short near-term option has higher gamma than the long far-term option near expiry, meaning a large move in the underlying can quickly create an unfavourable delta in the near-term leg that the longer-dated leg cannot fully offset.

In the Indian market, theta and vega dynamics become particularly important around weekly expiries. On a Monday morning, a weekly Nifty option expiring on Thursday has only four trading days of life remaining, placing it in the steepest part of the decay curve. This is precisely the environment where selling that front-week option and buying the next-week or current-month option can be attractive - as long as you are mindful of the vega risk around events that could spike volatility.

Mechanics of Constructing a Calendar Spread

A calendar spread is built with two legs: a short leg in the near-dated option and a long leg in the far-dated option. Both legs use the same strike price and the same option type - either both calls (a call calendar spread) or both puts (a put calendar spread). The choice between calls and puts depends largely on the trader's preference for the strike zone and on practical considerations like liquidity.

Let us walk through the construction step by step in the context of NSE Nifty 50 options.

Step one is to select the underlying. For most retail traders in India, Nifty 50 or Bank Nifty options are the natural choice because they offer deep liquidity across multiple expiry dates. Stock options on NSE are monthly only (except for a few large-cap stocks with weekly expiries), so a calendar spread in individual stocks uses consecutive monthly expiries.

Step two is to choose the strike. For a neutral calendar spread - one that profits from the underlying staying near the strike - you select the at-the-money (ATM) strike or the strike closest to the current market price. Nifty options are available in 50-point strike intervals, so if Nifty is at 22,400, the ATM strike is 22,400 (or whichever of 22,350 or 22,400 is closest). A bullish calendar spread uses a strike slightly above the current price, anticipating a mild upward drift by expiry of the near-month option. A bearish calendar spread uses a strike slightly below.

Step three is to select the two expiry dates. The most common combination in India is selling the current weekly expiry and buying the next weekly expiry (a one-week calendar) or selling the current monthly expiry and buying the next monthly expiry (a one-month calendar). Longer spreads - say, selling the current month and buying three months out - are called long calendar spreads or diagonal spreads if the strike also differs.

Step four is to check the net premium. In a standard calendar spread, you receive premium for the near-term option you sell and pay premium for the far-term option you buy. Because implied volatility is typically similar across nearby expiries (though not always), and because the far-term option has more time value, the net position is usually a debit - you pay slightly more for the far-term option than you collect for the near-term option. The maximum risk on a debit calendar spread is limited to the net debit paid.

Step five is to verify the margin and premium requirements. SEBI and NSE's clearing corporation (NSCCL) require margin for the short leg of any spread. However, because you hold a long position in the far-term option, the broker's system - if it recognises the spread - may offer a reduced margin requirement, as the long option provides some protection. Always check with your broker about how they calculate margins for spread positions.

Step six is to determine your exit plan before you enter. A calendar spread is a time-sensitive position. The ideal exit is shortly before the near-term option expires, when its time value has substantially decayed but before expiry risk (the near-term option going in-the-money sharply) takes over. Many experienced traders close the position one day before the near-term expiry to avoid last-day gamma spikes.

An important practical note: in India, options are European-style, meaning they can only be exercised at expiry, not before. This removes the early exercise risk that complicates calendar spreads in American-style options markets. However, the mark-to-market dynamics still apply - the position's value changes daily with the options' prices, and margin requirements can change if the market moves sharply against the near-term short.

Liquidity is a critical consideration. Far-dated options, particularly beyond the current month in individual stocks, can have very wide bid-ask spreads and low open interest. Entering or exiting such positions at a fair price can be difficult. For Nifty 50, the current and next monthly expiries typically have reasonable liquidity, but the expiry two months out may be thinner. Always check the open interest and bid-ask spread of both legs before committing to the trade.

The Role of Implied Volatility in Calendar Spreads

While theta is the primary driver of a calendar spread's profit potential, implied volatility (IV) is arguably the most important risk factor. A calendar spread has a split personality when it comes to volatility - it loves rising implied volatility in general (positive net vega) but can be severely harmed if the near-term and far-term IV relationship shifts in unexpected ways.

To understand this, consider how IV behaves across different expiry dates. Options traders are familiar with the concept of the term structure of volatility - a curve that plots implied volatility against time to expiry. In normal market conditions, this curve is fairly flat or slightly upward sloping, meaning longer-dated options have similar or slightly higher IV than shorter-dated ones. However, before a major market-moving event - say, an RBI policy announcement or the Union Budget - the near-term IV spikes dramatically while longer-dated IV rises much less. This creates a steep upward slope in the near part of the term structure.

For a calendar spread, the relationship between near-term IV and far-term IV is what matters most, not just the absolute level of either. If near-term IV is much higher than far-term IV, the near-term option you are selling is relatively expensive - that is a good time to initiate the spread. If near-term IV and far-term IV are approximately equal, the edge is smaller. If near-term IV is lower than far-term IV (a rare inverted term structure, sometimes seen in deeply distressed markets), the calendar spread actually loses its theoretical edge because you are selling cheap and buying expensive in volatility terms.

The IV crush phenomenon is extremely relevant in India around events. Before the Budget, for instance, the weekly Nifty options expiring in the Budget week can have significantly elevated IV compared to options expiring two weeks later. A calendar spread set up before the Budget - selling the Budget-week expiry and buying the following-week expiry - can benefit from the IV crush that typically follows after the announcement, because the near-term IV collapses while the far-term IV holds up better. This is sometimes called an event-driven calendar spread.

However, this approach has risks. If the Budget brings a large surprise and Nifty moves dramatically - say, 3 to 5 per cent in a single session - the calendar spread can lose money even with IV crush, because the short near-term option's delta loss exceeds the theta gain. The ideal outcome for a calendar spread is a moderate or no move in the underlying combined with an IV crush in the near-term expiry.

Vega also affects the spread's value as you hold it through time. As the near-term expiry approaches, the near-term option's vega falls rapidly (shorter-dated options have lower vega), while the far-term option's vega remains relatively high. This means the spread's net vega increases over time - it becomes more sensitive to IV changes as you approach the front-month expiry. This dynamic can cause the spread to swing in value even without any move in the underlying, purely from shifts in market sentiment and implied volatility.

Traders who use calendar spreads actively in the Indian market often monitor the VIX India (India VIX), published by NSE, as a proxy for near-term implied volatility. India VIX measures the market's expectation of 30-day volatility in Nifty, derived from out-of-the-money Nifty option prices. A high India VIX reading suggests elevated near-term IV, which can make the near-term leg of a calendar spread more attractively priced. A low India VIX suggests the opposite. While India VIX is not a perfect tool for managing individual expiry IV, it provides useful context for the overall volatility environment.

Call Calendar Spreads vs Put Calendar Spreads

Traders constructing a calendar spread in the Indian market have a choice of using calls or puts. In theory, if you are using European-style options (as all index options in India are), a call calendar spread and a put calendar spread at the same strike should behave very similarly due to put-call parity. In practice, however, there are differences in liquidity, bid-ask spreads, and sometimes in how brokers handle margin, which can make one more attractive than the other.

A call calendar spread involves selling a near-term call and buying a far-term call at the same strike. This is typically more liquid on the call side for strikes at or above the current index level, since call open interest tends to be higher on the upside for Nifty. Call calendar spreads are often used when the trader expects the underlying to remain around or drift slightly higher toward the short call's strike by the near-term expiry.

A put calendar spread involves selling a near-term put and buying a far-term put at the same strike. This is typically better suited for strikes at or below the current index level, where put open interest is higher. Traders who are mildly bearish - expecting Nifty to drift slightly lower toward the short put's strike - might prefer a put calendar spread.

There is also a concept called a neutral calendar spread, where you simultaneously set up both a call calendar spread and a put calendar spread, one above and one below the current market price. This is sometimes called a double calendar spread, and it creates a broader range of profitability at the expense of a higher initial debit.

For stock options in India, which are monthly and American-style for some older listings (though most are now European), the choice of calls vs puts can matter more because early exercise risk is theoretically present for deep in-the-money options, particularly for calls on high-dividend stocks around the ex-dividend date. For Nifty and Bank Nifty - which are cash-settled, European-style index options - this concern does not apply.

Liquidity in the far-dated leg is often the deciding factor. For Nifty 50 options, the current monthly and next monthly expiries are usually both liquid enough for call and put calendar spreads. For Bank Nifty, the weekly expiries are extremely liquid, and weekly calendar spreads (selling the current-week expiry and buying the next-week expiry) are popular among active traders. For individual NSE-listed stock options, liquidity drops off sharply in the second and third monthly expiries, making it harder to execute a calendar spread at a fair price.

Regardless of whether you use calls or puts, the profit and loss profile of a standard calendar spread looks like a tent shape when plotted against the underlying's price at the near-term expiry. The peak of the tent is at the strike price - that is where the near-term option expires worthless (maximum benefit from the short leg) while the long far-term option retains the most value. The tent slopes downward on both sides because if the underlying moves far away from the strike, the near-term option goes deeply in-the-money and its value roughly mirrors the far-term option's value, compressing the spread's value.

Weekly vs Monthly Calendar Spreads in the Indian Market

One of the unique features of the Indian derivatives market is the availability of weekly expiry options for major indices. NSE introduced weekly expiries for Nifty 50 and Bank Nifty, and over time these have grown to dominate trading volumes. This weekly expiry structure creates opportunities for calendar spreads that are simply not available in markets that only have monthly options.

A weekly calendar spread involves selling an option expiring in the current week (or the coming Thursday) and buying an option expiring in the following week at the same strike. The holding period is typically only a few days - you enter early in the week and aim to exit before Friday of the near-expiry week (the expiry being Thursday). Because both options have short lives, the theta differential is compressed into a very tight window, meaning the spread moves quickly.

The advantage of weekly calendar spreads is speed. Theta decay happens fast in weekly options, so the strategy can play out in three to four days. Implied volatility differentials between two adjacent weekly expiries can also be sharp around events, creating attractive entry points. For example, if the first week contains an RBI policy meeting and the second week does not, the first-week options may be priced with higher IV, making them attractive to sell.

The disadvantage is that weekly spreads require more active management. With so little time, a modest move in Nifty can quickly shift the near-term option into the money and require adjustment. Transaction costs also eat into profits more significantly as a proportion of the smaller premium collected in a weekly spread. Traders who are new to calendar spreads are often better served starting with monthly calendar spreads, where there is more time to observe and manage the position.

Monthly calendar spreads - selling the current month's expiry and buying the next month's expiry - offer a more relaxed pace. Entered early in the month, you have three to four weeks of theta decay in the near-term leg before expiry. This gives the underlying more time to settle near your strike and allows you to manage the position without daily stress. However, the far-month premium is higher, making the net debit larger and increasing the capital at risk.

A useful middle ground that some Indian traders use is a two-week calendar: selling the front-week option and buying the current month's option (which has two to three weeks remaining). This gives slightly more cushion than a pure weekly spread while still benefiting from the sharper theta decay of the front-week option.

In practice, the choice between weekly and monthly depends on your trading style, capital, and ability to monitor the position. SEBI and NSE regulations around derivatives trading also periodically change the margin requirements, especially for short options, so always check current SEBI circulars and NSE margin guidelines before initiating any spread position.

Calendar Spreads Around Market Events

Some of the most effective calendar spread opportunities in the Indian market arise around scheduled events that are known to spike implied volatility temporarily. Understanding how to use calendar spreads around these events requires familiarity with how IV behaves before and after announcements.

The mechanism is straightforward: before a major event, uncertainty is high, and the options market prices in a large potential move in the underlying by inflating implied volatility - particularly in the near-term options that expire closest to the event. Once the event occurs and the uncertainty is resolved, near-term IV often collapses rapidly (the IV crush), even if the underlying moves in a specific direction.

The main scheduled events in India that create this opportunity include: RBI Monetary Policy Committee (MPC) meetings, which occur six times a year and often move Nifty and Bank Nifty sharply; the Union Budget, presented in February, which is one of the single largest annual volatility events in Indian markets; quarterly earnings seasons (January, April, July, and October) for index heavyweights; and global events like the US Federal Reserve meetings, which affect FII flows into Indian markets.

To use a calendar spread around these events, the typical approach is: identify the event date; note which weekly or monthly option expiry falls in the same week as the event; observe whether near-term IV is elevated compared to the next expiry; if there is a meaningful IV premium in the near-term expiry, sell that expiry and buy the next one at the ATM strike.

The risk with event-driven calendar spreads is that if the event causes an extremely large move - far larger than the market had priced in - the calendar spread can still lose money despite the IV crush. This is because a very large move pushes both options deep in-the-money or far out-of-the-money, collapsing the spread value. The strategy works best when the event causes a moderate move (or no move) combined with an IV crush.

There is also the question of event timing within the expiry week. If the RBI policy announcement comes on a Wednesday and the weekly expiry is Thursday, the IV crush happens immediately after the announcement, and you may want to close the position the same afternoon rather than waiting until Thursday's expiry. Conversely, if the announcement comes on a Monday, you have more time for the position to play out.

Traders should also be cautious of using calendar spreads around events where the market is pricing a very large move - say, the India VIX is above 25 to 30 - because in such environments even the far-term option's IV can spike and collapse in unpredictable ways. In highly volatile environments, a different strategy may be more appropriate.

One additional consideration specific to the Indian market is circuit breakers. NSE imposes index circuit breakers at 10 per cent, 15 per cent, and 20 per cent intraday moves. In extreme events (such as a global financial shock), these circuit breakers halt trading and can prevent you from exiting your calendar spread at a fair price. This liquidity risk, while rare, should be factored into your worst-case scenario planning.

Calendar Spreads vs Other Multi-Leg Options Strategies

Calendar spreads occupy a specific niche in the options strategy universe, and it is helpful to understand how they compare to other multi-leg strategies that Indian options traders commonly use - particularly straddles, strangles, butterfly spreads, and iron condors.

A long straddle (buying both a call and a put at the ATM strike) is a volatility-buying strategy. You profit if the underlying makes a large move in either direction before expiry. A calendar spread is almost the opposite in spirit - it profits from the underlying staying near the strike and from time decay, not from a large move. However, both strategies are affected by changes in implied volatility, just in opposite ways: the straddle gains from rising IV (it has positive vega), while the calendar spread also has positive net vega but profits primarily from the differential decay between expiries rather than from rising IV alone.

A strangle (buying an OTM call and an OTM put) similarly benefits from large moves and is a volatility-buying strategy. Some traders combine a strangle with calendar logic by selling a near-term strangle and buying a far-term strangle at the same strikes - this is called a double calendar spread - to create a wider profit range.

An iron condor (selling an OTM call spread and an OTM put spread in the same expiry) is also a range-bound strategy and competes with the calendar spread in low-volatility environments. The key difference is that the iron condor uses the same expiry for all four legs and profits purely from time decay in a single expiry cycle, while the calendar spread exploits the differential decay across two expiries. An iron condor has a defined profit zone and loses money if the underlying moves outside that zone, just like a calendar spread. However, the iron condor typically has a higher maximum profit relative to the maximum risk in a narrow-range environment, while the calendar spread benefits more from an extended period of range-bound price action because the long far-term option retains value even after the near-term option expires.

A butterfly spread (typically constructed as a long call at a lower strike, two short calls at the middle strike, and a long call at a higher strike, all in the same expiry) also profits from the underlying staying near the middle strike at expiry. The butterfly is a single-expiry strategy that benefits entirely from theta decay in that one expiry, while the calendar spread uses two expiries to express a similar view. Calendar spreads are generally easier to adjust because you only need to manage the short near-term leg at expiry and can let the long far-term leg run.

In terms of capital efficiency in the Indian market, calendar spreads are competitive with other defined-risk strategies. The net debit for an ATM calendar spread on Nifty might be relatively modest compared to the margin required for a naked short or even an iron condor with full margin. However, calendar spreads do require margin for the short leg (offset partially by the long leg), and the actual net margin required varies by broker and is governed by SEBI and NSCCL regulations.

Overall, calendar spreads are best thought of as a complement to a diversified options strategy toolkit rather than a standalone approach. They work well in specific market environments (low volatility, range-bound, or pre-event) but can underperform or lose money when the market is trending strongly or when IV patterns behave unexpectedly.

Tax Treatment of Calendar Spreads in India

Options trading profits and losses in India have specific tax treatment, and calendar spreads - as a multi-leg options strategy - are subject to the same rules as any other options trading activity. It is important to understand the broad framework, though for precise guidance on your individual situation, you should consult a qualified chartered accountant, as tax laws are updated with each Finance Act and Finance Bill.

Under Indian income tax law, profits from options trading are classified as business income, not capital gains, for most active traders. This is because options are treated as derivatives, and gains or losses from derivatives are categorised as non-speculative business income under Section 43(5) of the Income Tax Act (for exchange-traded derivatives, which is the relevant category for NSE-listed options). This means that options profits are added to your total income and taxed at your applicable slab rate.

Because options profits are treated as business income, losses from options trading can be set off against other business income in the same year, and can also be carried forward for up to eight assessment years to be set off against future business income. This is a favourable provision compared to speculative losses (from intraday equity trading), which can only be set off against speculative gains.

For a calendar spread specifically, each leg is a separate options transaction for the purposes of STT, brokerage, and record-keeping. The premium received from the short near-term option and the premium paid for the long far-term option are both recorded as separate transactions. When you close or roll the legs, those are additional transactions. Your net profit or loss for tax purposes is the sum of all these transactions, net of all transaction costs (brokerage, STT, exchange charges, GST, etc.).

STT (Securities Transaction Tax) is levied at the time of each options transaction at a rate specified in the Finance Act - the sell side of an options premium transaction attracts STT. When you sell the near-term option to open the short leg, STT applies. When you buy it back to close (or it expires worthless, in which case there may be no STT), the buy transaction may or may not attract STT depending on whether the option is exercised or lapses. Refer to the latest Finance Act for current STT rates, as these are revised periodically.

If your options trading turnover crosses specified thresholds, a tax audit under Section 44AB of the Income Tax Act may be required. For derivatives trading, turnover is typically calculated as the absolute sum of all profits and losses (not the notional value), but accounting standards and case law continue to evolve - consult your CA for the current position.

GST at 18 per cent applies to brokerage and other service charges paid to your broker, adding to your transaction costs. Stamp duty on options contracts is also applicable at rates specified by state governments and the central government, with electronic contracts attracting stamp duty at a central rate under the Stamps Act as amended.

The key takeaway for calendar spread traders is to maintain meticulous records of every entry, exit, and roll transaction for each leg of every spread. Most modern trading platforms and brokers in India generate trade ledgers and contract notes that facilitate this record-keeping, but the ultimate responsibility for accurate tax reporting rests with the trader.

Common Mistakes and How to Avoid Them

Even experienced options traders make avoidable errors when trading calendar spreads, particularly when transitioning from simpler directional strategies. Understanding the most common mistakes can save considerable capital and frustration.

The first and most common mistake is ignoring the far-dated leg's liquidity. Traders sometimes enter the near-term short leg easily (high liquidity) but struggle to get a fair price on the far-dated long leg because that contract has low open interest and a wide bid-ask spread. This results in entering the spread at an unfavourable price, effectively giving up edge before the position even begins to work. Always check the bid-ask spread and open interest of both legs, and if the far-dated leg is illiquid, either choose a different expiry that is more liquid or wait for better conditions.

The second mistake is setting up a calendar spread just before an event without checking the IV differential. If near-term IV is already trading at a discount to far-term IV (an inverted term structure), the calendar spread has a negative IV edge - you are selling cheap and buying expensive. In this scenario, the strategy loses its theoretical basis. Always check that the near-term implied volatility is equal to or higher than the far-term implied volatility before initiating.

The third mistake is not having an exit plan. Calendar spreads require active management near the near-term expiry. Many traders enter the spread but do not plan for the final two days before the front-month option expires. In those final two days, gamma risk in the short near-term option spikes dramatically - a modest intraday move can create large P&L swings. The rule of thumb is to close the entire spread (both legs) one to two days before the near-term expiry, locking in whatever profit or loss has accumulated.

The fourth mistake is over-leveraging. Because the net debit on a single calendar spread can appear modest in absolute rupee terms (perhaps ₹3,000 to ₹8,000 net debit per lot on a Nifty ATM spread), traders sometimes initiate multiple lots to scale up the position. But if the underlying makes a sharp adverse move, each lot loses money simultaneously, and the aggregate loss can be substantial. Position sizing discipline is non-negotiable.

The fifth mistake is confusing a calendar spread with a diagonal spread. A diagonal spread uses different strikes in addition to different expiries - for example, selling the current-week ATM call and buying the next-month call at a higher OTM strike. Diagonal spreads have additional directional exposure and behave quite differently from a standard calendar spread. Beginners should master the standard (same-strike) calendar spread before experimenting with diagonal variants.

The sixth mistake is neglecting to account for the cost of carry and dividends in stock options. If you are trading a calendar spread on a dividend-paying stock around its ex-dividend date, the options pricing will reflect the expected dividend, and the call-put parity relationship can shift in ways that affect your spread's value. This is less of an issue for index options (since Nifty and Bank Nifty represent dividend-adjusted versions of their underlying indices), but it matters for individual stock options.

Finally, many traders make the mistake of abandoning the strategy after a single losing trade. Calendar spreads, like any options strategy, have periods where they underperform - particularly during trending markets or volatility expansions. The appropriate response is to review whether the market environment was suitable for the strategy, refine the entry criteria, and apply proper risk management rather than either abandoning or doubling down indiscriminately.

Example

Key benefits

How it works

1. 1
   Select the Underlying and Expiries

   Choose a liquid underlying such as Nifty 50 or Bank Nifty on NSE. Identify two expiry dates - a near-term expiry (to be sold) and a far-term expiry (to be bought), ideally one week to one month apart.

2. 2
   Choose the Strike Price

   Select the ATM strike for a neutral calendar spread, or a strike slightly above or below the current price for a mildly directional bias. Verify that both expiries have reasonable liquidity at this strike.

3. 3
   Sell the Near-Term Option

   Sell one lot of the near-term call (or put) at the selected strike, collecting the premium. This is the theta-harvesting leg that benefits from rapid time decay.

4. 4
   Buy the Far-Term Option

   Simultaneously buy one lot of the far-term option at the same strike and option type. Pay the premium - this leg decays more slowly and retains value while the short leg decays.

5. 5
   Monitor the Position Daily

   Track the underlying's price relative to your strike, the implied volatility of both expiries, and the net spread value. Be prepared to adjust if the underlying moves significantly away from your strike.

6. 6
   Manage Near Expiry Carefully

   As the near-term expiry approaches within the final two to three days, gamma risk increases sharply. Plan to close or roll the short leg before the final session to avoid large intraday P&L swings.

7. 7
   Exit or Roll the Position

   Close both legs simultaneously to lock in profit or loss, or roll the short leg to the next expiry to continue the strategy for another cycle while keeping the far-term long option in place.

Formula

Net Debit = Far-Term Option Premium − Near-Term Option Premium
Maximum Risk = Net Debit Paid (per unit) × Lot Size

Key takeaways

Frequently asked questions

Related terms