Implied Volatility (IV) is a measure of the market’s expectations of how much the price of the underlying asset is likely to move in the future.
It is not based on past movements but is derived from the current price of the option.
IV reflects how volatile traders expect the asset to be until the option expires.
Implied volatility plays a central role in option pricing because it directly influences the premium paid or received when trading options.
What Does Implied Volatility Represent?
IV expresses expected price movement of an asset over a given time (usually until option expiry).
It is measured in percentage terms, on an annualized basis.
Example:
An IV of 30% means the market expects the stock to move ±30% over a year.
Important: IV does not indicate direction — only the expected size of movement.
How Is Implied Volatility Used in Option Pricing?
Options are priced using models like Black-Scholes, where volatility is a key input.
Other inputs like strike price, expiry, and underlying price are known.
Volatility is not directly observable, so it is implied from the premium using models.
Impact:
Higher IV → Market expects larger moves → Option premiums are higher
Lower IV → Market expects smaller moves → Option premiums are lower
Example
Two stocks trade at ₹1,000:
Stock A has IV = 15%
Stock B has IV = 40%
Even with the same strike and expiry, the option on Stock B will have a higher premium due to higher expected volatility.
Implied Volatility vs Historical Volatility
Feature
Implied Volatility
Historical Volatility
Based on
Current option price
Past asset price movement
Indicates
Market’s expectation of future volatility
Actual past movement
Direction
No (only magnitude)
No (only magnitude)
Affects Premium
Yes — directly
No
Traders often compare IV to historical volatility to find overpriced or underpriced options.
How IV Affects Option Premium
Implied Volatility
Option Buyer Impact
Option Seller Impact
High IV
Pays higher premium
Collects higher premium
Low IV
Pays lower premium
Collects lower premium
Sellers prefer high IV because they earn more premium
Buyers prefer low IV because entry is cheaper
Volatility Crush
When IV falls sharply after events like earnings, option premiums drop even if the stock moves.
This is called volatility crush and often causes losses for option buyers.
Practical Use of Implied Volatility
Traders use IV to:
Assess if premiums are high or low
Select strike prices and strategies
Avoid overpaying during high IV conditions
Plan strategies such as:
Straddles or strangles during high IV
Iron condors or credit spreads during low IV
Key Takeaways
Implied volatility (IV) is the market’s forecast of how much an asset may move until expiry.
IV is derived from option premiums, not past data.
Higher IV means higher premiums; lower IV means cheaper options.
IV shows the size of expected movement, not the direction.
Traders use IV to assess risk, opportunities, and strategy suitability in options trading.