What Is Volatility Skew in Options? A Beginner's Guide
Learn what volatility skew means, why implied volatility differs across option strikes, and how traders can interpret the shape of an option volatility structure.
What Is Volatility Skew?
Volatility Skew describes the difference in implied volatility between options with different strike prices but the same underlying and expiration.
In real markets, implied volatility is often not identical across strikes. The resulting variation is called volatility skew.
Why Does Implied Volatility Differ by Strike?
Market participants may value protection and speculative exposure differently at different strikes.
For example, demand for downside protection can influence the relative pricing of out-of-the-money puts.
This can cause implied volatility to be higher at some strikes than others.
Skew vs Implied Volatility
Implied Volatility asks:
How much volatility is priced into this option?
Volatility Skew asks:
How does implied volatility change across strikes?
Therefore, skew is a way of analysing the cross-strike structure of IV.
See What Is Implied Volatility? A Beginner's Guide to IV in Options Trading for the fundamentals of IV.
What Does a Volatility Skew Look Like?
Imagine the same expiry has these IV readings:
The higher IV at the lower strike indicates a downside skew.
The exact shape varies by underlying, expiry, market conditions, and demand.
Volatility Skew in Index Options
Index options can display meaningful differences in IV across calls and puts.
During periods of concern about downside risk, demand for protection can influence the relative pricing of out-of-the-money puts.
This does not mean skew alone predicts a market decline. It describes the pricing structure.
Skew and the Option Chain
What Is an Option Chain? A Beginner's Guide explains how strikes, calls, puts, expiries, and related data are organised.
When studying skew, compare IV across multiple strikes rather than looking only at premium.
Skew and Open Interest
Open Interest and implied volatility measure different things.
What Is Open Interest? A Beginner's Guide explains outstanding option positions.
A strike can have high OI without having the highest IV. Therefore, high OI does not automatically mean high or low volatility.
Volatility Skew and Option Greeks
Vega measures sensitivity to changes in implied volatility. See What Is Vega in Options?.
Delta, Gamma, Theta, and Rho measure other dimensions of option risk. Skew provides a different perspective by examining IV across strikes.
Why Skew Matters to Option Traders
Two options at similar distances from spot can still have different implied volatility.
Therefore, selecting a strike based only on premium or distance from the underlying can overlook an important part of the pricing structure.
How Beginners Can Use Skew
A disciplined approach is:
Final Thoughts
Volatility Skew helps traders move beyond looking at a single implied volatility number.
It shows how the market's implied volatility changes across option strikes and can add useful context to option-chain and volatility analysis.
Frequently Asked Questions
What is volatility skew?
It is the difference in implied volatility across option strikes for the same underlying and expiration.
Does higher IV mean the market expects the price to move in that direction?
Not necessarily. IV reflects volatility priced into the option, not a guaranteed directional forecast.
Is skew the same as implied volatility?
No. IV belongs to an individual option; skew describes how IV differs across strikes.
Can skew change over time?
Yes. Market demand, hedging activity, risk perception, and market conditions can change the volatility structure.
Disclaimer
This article is for educational purposes only and does not constitute financial advice. Options trading involves substantial risk.
This article is for educational purposes only and does not constitute financial advice. Please consult a SEBI registered investment advisor before making any investment decisions.