Calendar Spread
Profit from time decay difference between near-term and far-term options at the same strike.
A calendar spread (also called a time spread or horizontal spread) involves selling a near-term option and buying a longer-term option at the same strike. It profits from the faster time decay of the short-dated option relative to the long-dated option. It also benefits from IV increases in the back-month option.
Strategy Structure
Sell 1 near-term ATM Call + Buy 1 far-term ATM Call (same strike, different expiry). Can also be done with puts.
Profit & Loss Profile
Market Outlook
Neutral near-term, mildly directional or neutral longer-term.
When to Use
- You expect range-bound action in the near term
- IV is low and you expect it to increase
- You want to exploit the theta differential between two expiries
- Post-event plays where near-term IV is elevated (sell expensive, hold cheaper)
When to Avoid
- When IV is already elevated (long option is expensive)
- If term structure is inverted (near-term IV much higher than far-term)
- In strongly trending markets where the underlying will move far from the strike
- If you need to manage complex multi-expiry positions
Ideal Conditions
- You expect the underlying to be at or near the strike at the near-term expiry
- IV is low — calendar spreads benefit from IV increase (long vega)
- Near-term IV is similar to or higher than far-term IV (normal or flat term structure)
- You want a position that benefits from both theta and potential IV expansion
Greeks Impact
Near-zero at entry (both legs are same strike, opposite expiry effect is small).
Slightly negative near-term (short option has higher gamma), but positive overall from the long option.
Positive theta — the short near-term option decays faster than the long far-term option.
Positive vega — the long far-term option has more vega than the short near-term option. Benefits from IV increase.
Nifty Example
Setup: Sell 22500 CE (this week) at ₹80, Buy 22500 CE (next week) at ₹160. Net debit = ₹80. At this week's expiry, if Nifty is at 22500, the short CE expires worthless and the long CE retains ~₹100. Profit = (₹100 - ₹80) × 25 = ₹500.
If profitable: If Nifty stays near 22500 at the first expiry, you gain the full theta of the short option while the long option retains most of its value. Estimated profit: ₹500-₹1,250 per lot.
If loss: If Nifty moves sharply away from 22500 (e.g., to 23000 or 22000), both options move similarly and the spread loses value. Max loss = ₹80 × 25 = ₹2,000.
Adjustments & Risk Management
- Roll the short option to the next week after the near-term expires (serial calendar)
- Shift the strike if the underlying has moved (convert to diagonal spread)
- Close if IV spikes (the long option gains more than the short option)
- Add another calendar at a different strike to create a double calendar
Calendar Spreads in Indian Markets
Indian options markets offer weekly expiries for Nifty and BankNifty, making calendar spreads practical with weekly-to-weekly or weekly-to-monthly setups. The typical setup is selling this week's expiry and buying next week's expiry at the same ATM strike.
One unique consideration: India's options are European-style (no early exercise risk), which makes calendar spreads cleaner to manage than in markets with American-style options. However, liquidity in far-dated options can be thinner, so check bid-ask spreads before entering.
Related Strategies
See Calendar Spread in Real-Time
Track live Calendar Spread values across multiple strikes and expiries on Quintal Mind.
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