Implied volatility, the seller's tailwind Options Foundations

Implied volatility (IV) is the market's bet on how much a stock will move in the future, baked right into the option's price. It is implied because it is reverse-engineered from what people are paying. When traders expect big moves, they pay up for options, IV rises, and premiums get fat. When everyone is calm, IV falls and premiums shrink. For a seller, IV is the single biggest lever on how much you get paid.

IV vs. historical volatility

Think of HV as the weather you have already had, and IV as the forecast everyone is pricing in. They often disagree. When IV sits well above HV, the market is paying up for fear that may not materialize — fertile ground for a seller, because you are collecting premium for movement that often does not arrive.

IV rank tells you when premium is rich

Raw IV needs context. IV rank places current IV within its own 52-week low-to-high range. IV percentile instead counts how often historical daily IV was lower. A rank near 70 is toward the high end of the range; it does not mean IV exceeded 70% of daily observations. Neither measure alone is a reason to trade.

IV crush: the event trap

Before a known event — an earnings report, an FDA decision, a major product launch — IV balloons because nobody knows the outcome. The moment the news drops, the uncertainty is gone and IV collapses, often violently. This sudden drop is called IV crush. It can be a windfall for a seller (your option deflates fast) but it cuts both ways: if the stock gaps against you, the crushed time value will not save you from a real directional loss.