Pricing and Market Analysis · Options Trading Guide

Implied volatility is backed out of option prices. Its pattern across strikes and expirations helps explain relative pricing, but does not reveal the future.

Distinguish an input from an outcome

Implied volatility is the volatility input that reconciles a pricing model with a market premium. Realised volatility measures past movement over a chosen window. They answer different questions. Comparing them requires consistent annualisation and a relevant period. A backward looking measure can omit an event that options already price into the future.

Inspect the surface

Skew describes variation in implied volatility across strikes. Term structure describes variation across expirations. A stock may show expensive downside puts or elevated volatility in an expiration containing earnings. Comparing two contracts by premium alone confuses strike, time and volatility effects. Record the underlying price, quote time and model when observing a surface.

Construct a comparison

Imagine 30 day options imply 40% annualised volatility while 90 day options imply 30%. That does not mean the next 60 days imply 20%. Using a simplified variance calculation with equal day units, forward variance is (0.30² × 90 minus 0.40² × 30) ÷ 60 = 0.055. Its square root is approximately 23.45%. This calculation assumes compatible measurements and is an analytical estimate rather than a tradable contract price.

Turn an observation into a question

High implied volatility can compensate sellers for genuine event risk. Low volatility can remain low while purchased options decay. Compare the surface with scheduled events, liquidity and a documented forecast distribution. When the forecast and market differ, state why and what could invalidate the view. Avoid labelling a contract cheap merely because its premium is small. A far strike option can have a tiny cash price and still be expensive relative to a realistic probability of reaching it.

Try it yourself

Two calls have different expirations and strikes. One has a lower premium but higher implied volatility. Is it automatically cheaper?

Show the worked answer

No. Premium reflects several inputs. Compare contracts under consistent price, time and volatility scenarios rather than ranking their cash premiums alone.

Further reading

Educational material. Examples and rates are hypothetical, not trade recommendations. Product terms, eligibility and risks vary by venue and jurisdiction.

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