Options Strategy
Theta play
Calendar Spread - Nifty 50
Sell a near-term option and buy a far-term option at the same strike. The near-term option decays faster, so you profit from the time value differential. Maximum profit occurs when Nifty sits exactly at the strike on near-term expiry.
Leg 1 — SELL near-term option
24,000 CE (weekly)
Receive: ₹180 · Expires sooner
Leg 2 — BUY far-term option
24,000 CE (monthly)
Pay: ₹380 · Expires later
Net debit
₹15,000
Max risk (per lot)
Strike
24,000
Same for both legs
Near theta / day
₹540
Near-term decay rate
Far theta / day
₹285
Far-term decay rate
Adjust your trade parameters
Daily theta comparison — near term decays faster
Near-term (sell)
₹540 / day
Far-term (buy)
₹285 / day
Far from strike
Both legs move ITM or deep OTM together. Time value advantage disappears and net debit is lost.
Near the strike
Near-term option decays faster. Spread widens as theta differential compounds in your favour.
Pinned at strike
Near-term expires worthless. Far-term retains maximum time value. Best possible outcome.
Call calendar vs Put calendar: Both work identically in terms of theta mechanics. A call calendar is slightly more common on bullish or neutral Nifty views. A put calendar suits a mild bearish or neutral view. The IV structure matters more than direction, Enter when near-term IV is elevated relative to far-term IV so you are selling expensive near-term options.
How to execute on NSE
1
Choose a flat or mildly directional week for the near leg. Select the strike closest to the current Nifty spot .ATM options have the highest theta.
2
SELL the near-term option (e.g. current weekly expiry CE/PE at the ATM strike). You receive premium.
3
BUY the far-term option (e.g. monthly expiry CE/PE at the same strike). Same type both calls or both puts.
4
Net debit = Far premium − Near premium × 75. This is your maximum loss if both sides expire worthless or move far away from the strike.
5
At near-term expiry, close the far-term leg by selling it. Do not hold it. Yu can then re-sell the next week's option to run the spread again.
Key risks to know
Large Nifty move kills the spread: If Nifty moves far away from the strike in either direction, both options lose their time value differential and the spread collapses to near zero. The max loss is the net debit paid.
IV crush on near-term: If near-term IV collapses before expiry (e.g. after a scheduled event resolves), the near-term option loses value faster but so may the far-term. Monitor IV levels on both legs.
Two expiry dates to manage: Unlike most spreads, the two legs expire on different dates. You must actively close the far-term leg after the near-term expires or roll the near-term leg to avoid being left with a naked long option.
Not a set-and-forget trade: The calendar spread requires active management around expiry. If Nifty drifts away from the strike mid-week, consider closing early to preserve the theta gains rather than waiting for a recovery that may not come.