What is Credit Spread?
A credit spread nets premium upfront with risk capped by the long protective leg. Bull put and bear call variants are common on NSE.
Formula
Max profit = credit; Max loss = spread width - credit
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 Credit 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). Credit 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. Credit 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 credit 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 Credit 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 Credit 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 Credit Spread statistics.
Best practices
- Size Credit 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 Credit 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 net credit, max loss ₹, and DTE. Monthly expectancy for put vs call credit tags.
Related terms
A covered call sells a call option while holding the underlying shares. Premium income trades against capped upside if stock rallies hard.
An iron condor combines bull put and bear call credit spreads, profiting if price stays between short strikes through expiry.
Theta measures expected premium change from passage of time, holding other factors constant. Long options usually have negative theta; short options collect theta.
Vega estimates premium change per one-point move in implied volatility. Long options benefit from vol expansion; short options suffer.
FAQ
What is a credit spread?
A credit spread involves selling an option and buying a cheaper option at a different strike. You receive a net credit upfront. Profit if the spread expires worthless or decreases in value.
What are the types of credit spreads?
Bull put spread (sell put, buy lower put) profits if stock stays up. Bear call spread (sell call, buy higher call) profits if stock stays down. Both collect premium.
What is the max profit and loss on a credit spread?
Max profit = credit received. Max loss = spread width minus credit. Example: $5 wide spread with $1.50 credit = max profit $1.50, max loss $3.50.
When should you use credit spreads?
Use credit spreads when you want to collect premium with defined risk. Best when IV is elevated. Profits from time decay and IV decrease. Good for neutral to directional views.
Is credit spread safer than selling naked options?
Yes. The long option caps your loss. Naked puts have huge risk; put credit spreads have defined risk. Always know your max loss before entering.
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