Implied Volatility Explained: Why IV Matters for Options Income

Two stocks can trade at the same price, and their options can cost wildly different amounts. The reason is almost always implied volatility (IV), the market’s estimate of how much a stock might move in the future. For anyone selling options for income, IV is arguably the most important number on the chain.

What implied volatility actually is

Implied volatility is the expected size of future price swings, baked into an option’s price. It is not a direction, high IV does not mean the stock will go up or down, only that the market expects a bigger move either way. When fear or uncertainty rises, IV rises and options get more expensive. When things calm down, IV falls and options get cheaper.

Why sellers love high IV

When you sell a covered call or a cash-secured put, you collect the option’s premium. Higher IV means fatter premium for the same strike, you get paid more to take the same obligation. And because IV tends to revert toward its average, premium sold when IV is high often loses value as IV falls back, handing the seller a gain. That is the core edge of premium selling: sell expensive, let it deflate.

IV rank and IV percentile

A raw IV number means little on its own, you need context. Two tools give it:

• IV rank tells you where today’s IV sits between its 52-week low and high, on a 0 to 100 scale. IV rank of 80 means IV is near the top of its yearly range.
• IV percentile tells you the share of days over the past year that IV was lower than today.

A common rule of thumb: premium sellers prefer to sell when IV rank is elevated, and to be patient when it is low.

IV crush: the earnings trap

Before an earnings report, uncertainty is high, so IV spikes and options get pricey. The moment earnings are released, the uncertainty is gone and IV collapses, this is “IV crush.” Buyers are often shocked to see their calls or puts lose value even when the stock moved their way, because the volatility they paid for evaporated. Sellers can benefit from that crush, though the trade-off is exposure to a big earnings gap.

How to use IV in practice

1. Check IV rank before selling. Prefer to sell premium when it is elevated, not when it is dead.
2. Respect earnings. Know when the company reports; the IV crush and gap risk change the trade entirely.
3. Remember vega, the Greek that connects IV to your option’s price, covered in our Greeks guide.

The bottom line

Implied volatility is the price of uncertainty. Sellers want to sell it when it is expensive and let it deflate; buyers want to avoid overpaying for it, especially into earnings. Learn to glance at IV rank before every options trade and you are ahead of most beginners. Put it to work with the wheel strategy.

This article is for educational purposes only and is not financial advice. Options involve risk and are not suitable for every investor.