What is Calendar Spread?
Calendar spread longs nearer expiry and shorts farther (or reverse) — exploits time and vol differences.
Indian market context (NSE)
Reference levels: Nifty 50 at 24,300, Reliance Industries at ₹1,300, Bank Nifty futures at 55,000 (lot size 30). Examples below show how Calendar Spread shows up on Indian index, equity, and futures books — update to live quotes in your journal.
Nifty 50 perspective
Nifty at 24,300: weekly/monthly option chains centre on round strikes (24,000 / 24,500). Calendar Spread on ATM Nifty options shifts quickly into expiry — India VIX and event risk (RBI, budget) reprice premiums independent of spot.
Reliance Industries perspective
Reliance at ₹1,300: stock options are American-style on NSE with liquidity concentrated near ATM strikes. Calendar Spread behaviour on ₹1,300 handle differs from index options — watch assignment on short ITM legs before expiry.
Bank Nifty futures perspective
Bank Nifty futures at 55,000: hedging with options or trading calendar spread on Bank Nifty weekly contracts — theta and gamma rise sharply into Thursday expiry; futures leg has no time decay but carries overnight gap risk.
How to validate
- Validate Calendar Spread separately for index weeklies vs stock options.
- Stress-test with expiry-week and event-week subsets (RBI, budget, results).
- Confirm margin and tail-loss scenarios are logged for short premium books.
- Discard readings polluted by untagged discretionary adjustments.
How to track in TradeLyser
- Tag every leg: structure, DTE, moneyness, and whether Calendar Spread was a primary driver.
- Log planned max loss ₹ on entry for short premium strategies.
- Weekly: list open short ITM/ATM legs before expiry with a written roll/close rule.
- Separate F&O account tags from cash equity for Calendar Spread statistics.
Best practices
- Size Calendar Spread trades with margin headroom for gaps and assignment.
- Prefer defined-risk structures when learning a new options concept.
- Roll or close based on written DTE rules, not convenience.
- Keep weekly index and monthly stock books in separate tags.
Common pitfalls
- Short premium without defined max loss while Calendar Spread risk builds.
- Holding illiquid stock options into expiry without a plan.
- Blending index and stock gamma exposure in one tag.
- Ignoring margin spikes on gap opens.
How to use this in TradeLyser
Log near/far expiry and IV at entry; review roll dates in notebook.
Related terms
Implied volatility backs out expected future volatility from current option premiums using pricing models. It can diverge sharply from recent realised volatility.
Rollover closes or shifts positions from near-expiry contracts to the next series, avoiding delivery or illiquid last days.
Theta measures expected premium change from passage of time, holding other factors constant. Long options usually have negative theta; short options collect theta.
Vertical spread pairs adjacent strikes same expiry — bull call or bear put structures.
FAQ
Calendar on stock earnings?
Vol term structure twists — tag event.
Max loss defined?
Know debit paid or margin for short front.
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