What Is Implied Volatility (IV)?

Delta tells you probability. Theta tells you daily decay. But implied volatility is what sets the price of the entire game.

Implied volatility (IV) is the market’s forecast of how much a stock will move over a given period, expressed as an annualized percentage. It’s forward-looking, not backward-looking. Not what already happened, but what the market expects to happen.

For Wheel traders who sell cash-secured puts and covered calls, IV is the single biggest driver of how much premium you collect.

My previous article on theta introduced IV briefly and how it affects time decay.

Now we go deeper on what IV actually is, how to read it, and how to use it.

For a gentle introduction to delta and theta, start with this intro article on Options Greeks.

What Is Volatility?

Volatility is like a weather forecast. It tells you how stormy or calm conditions are expected to be.

• A stock with high volatility is like a region with wild weather swings
• Low volatility is like a mild climate

Sure, the analogy isn’t perfect, but it captures the core idea:

Volatility simply measures how much a stock’s price bounces around (the size and frequency of price swings).

As a quick refresher:

• Volatility measures the magnitude of price movements, not the direction
• A stock that swings $5 a day is more volatile than one that moves $0.50
• Volatility is expressed as a percentage, making it comparable across different stock prices
• Volatility changes over time as market conditions shift

All that said, high volatility doesn’t automatically mean “dangerous.” It means bigger moves in both directions.

For Wheel traders, volatility is the raw material that creates premium.

So if volatility is just how much a stock moves…who decides what the expected volatility should be?

That’s where implied volatility comes in.

What Is Implied Volatility (IV)?

IV is the market’s forecast of how much a stock will move over a given period, expressed as an annualized percentage.

IV is forward-looking.

• Historical volatility tells you what already happened
• IV tells you what the market expects to happen next

Where IV Comes From

IV is backed out of option prices using pricing models. You don’t calculate it. Your brokerage does.

What matters is understanding what the number means, not how it’s derived.

Note: The most common model is Black-Scholes. IV is the one variable in the model you can’t directly observe. It’s the “plug” value that makes the model’s theoretical price match the actual market price. Think of it as the market’s collective bet on future uncertainty.

What the IV Number Actually Means

IV is expressed as an annualized percentage.

An IV of 50% means the market expects the stock could move up or down roughly 50% over the next year.

But nobody trades annual horizons. So we convert to a shorter timeframe using the one-standard-deviation rule.

“One standard deviation” just means the range where the stock lands about two-thirds of the time.

IV Worked Example

Okay, let’s suppose that B (Barrick Mining), is currently trading at ~$43 with IV at 50%.

That means that over the next 30 days, the market expects B to stay within roughly $36.84 to $49.16, about 68% of the time.

That’s a $6.16 move in either direction. Not trivial.

How did I arrive there?

Let’s take a look at the math:

• Expected Move = Stock Price x IV x sqrt(DTE / 365)
• Plug in B’s numbers: $43 x 0.50 x sqrt(30/365) = ~$6.16
• Range: $43 - $6.16 = $36.84 to $43 + $6.16 = $49.16

You never need to do this by hand. Most brokerages will show you this data on the options chain.

But understanding where the number comes from helps you evaluate whether the market’s forecast feels reasonable for the stock you’re trading.

How IV Affects Option Premiums (and Your Wheel Income)

Keep in mind the golden rule of IV:

• Higher IV means fatter premiums
• While lower IV equals thinner premiums

IV is the dial that controls how much you get paid for selling cash-secured puts and covered calls.

Same stock, same strike, same DTE, but different IV environments produce dramatically different premiums.

A Tale of Two IV Environments

Let’s walk through what this looks like in practice with B using the following example:

• Last month B was trading at ~$43 with IV sitting at 30%
• The $41 put (35 DTE) was paying around $0.75
• Fast forward a month, stock price hasn’t moved, still ~$43
• But the dollar has strengthened, bond yields are climbing, and there’s chatter about B’s upcoming earnings
• IV has jumped to 55%
• That same $41 put (35 DTE) is now paying $1.85

Same stock. Same strike. Same DTE. The only thing that changed is IV.

Note: These are illustrative values to show the IV-premium relationship. Actual premiums depend on multiple factors beyond IV alone.

The Tradeoff (This Is the Important Part)

There’s no such thing as a free lunch in the stock market. High IV exists for a reason. It’s pricing in real risk.

When IV spikes on B because of gold macro concerns, the market is saying “we expect bigger moves.” Bigger expected moves mean a higher probability of the stock breaching your strike.

That $1.85 premium is compensation for the elevated risk of assignment.

The fat premium is the market paying you to absorb uncertainty.

Every Wheel trader needs to ask themselves one question:

Am I being paid enough for this risk, or am I picking up pennies in front of a steamroller?

Elevated IV also means the effective probability of assignment may be higher than delta alone suggests.

The stock has more room to swing. Delta gives you a baseline probability, but IV tells you how much the market expects the underlying to actually move around.

IV Rank and IV Percentile

So how do you know if IV is actually high or low for this particular stock?

That’s where IV Rank and IV Percentile come in:

• IV Rank measures where current IV falls relative to the past year’s high and low (on a 0-100 scale)
• IV Percentile measures what percentage of days in the past year had IV lower than today

Both tools help you contextualize the raw IV number against a stock’s own history.

The full treatment of how to use these for trade timing lives in the IV vs. HV article.

IV Crush: What It Is and Why Wheel Traders Must Understand It

IV crush is the sharp, sudden drop in implied volatility after a known catalyst passes:

• Earnings reports
• FDA decisions
• Central bank announcements
• Effectively, any date-certain event that resolves uncertainty

Why It Happens

Before the catalyst, uncertainty is high. Nobody knows the outcome, so the market prices in bigger expected moves (higher IV).

Once the event passes, the uncertainty evaporates. IV collapses regardless of whether the news was good or bad.

The uncertainty itself was the IV driver, not the outcome.

Worked Example: Pre and Post-Earnings

Let’s walk through an example of IV crush in action, using B, the same ticker as earlier:

• Two weeks before B’s quarterly earnings, IV starts climbing (uncertainty about gold prices, production numbers, revenue guidance)
• IV reaches ~65%
• You sell the B $41 put (21 DTE) and collect $2.10 in premium
• The fat premium reflects the elevated pre-earnings IV
• Earnings come and go roughly one week later, B reports decent numbers, stock barely moves
• Next morning, IV has crushed from 65% down to ~38%
• The put you sold for $2.10 is now worth ~$0.60 (~14 DTE remaining)
• The stock didn’t move meaningfully, IV crush alone vaporized most of the extrinsic value
• You could buy the put back for $0.60 and pocket $1.50 of the $2.10 premium in a single overnight move

That’s a ~71% gain on the position, and the stock barely twitched.

IV crush isn’t limited to earnings, either. It happens around any known catalyst:

• FDA drug approval decisions
• Federal Reserve rate announcements
• Central bank gold reserve reports

Any time a date-certain event resolves, the uncertainty premium collapses.

The “Should I Sell Pre-Earnings IV?” Debate

This is one of the most common questions Wheel traders ask. And the honest answer is: it depends.

The Cautious Stance (Default for Most Traders)

Selling into pre-earnings IV is risky.

The premium may look tasty and irresistible, but you’re taking on binary event risk.

The stock may gap 10% overnight and your put is deep ITM before the market opens.

That fat premium won’t save you from a big gap down.

The Aggressive Stance (Valid for Experienced Wheelers)

Aggressive Wheelers deliberately seek out these setups.

They’re looking for pre-earnings elevated IV because the premium is at its richest.

If you’d genuinely be happy owning the stock at that strike price even after a bad earnings report, selling elevated pre-earnings IV can be a calculated play.

Neither approach is wrong. It’s a personal decision based on trading style, risk tolerance, and conviction on the underlying stock.

How IV Crush and Theta Work Together

IV crush and theta hit your premium from two directions at once.

• The IV collapse deflates extrinsic value
• Theta keeps eroding whatever’s left
• When both forces are working in your favor simultaneously, the option you sold can lose value fast

That’s the Wheel seller’s dream scenario…and it’s exactly what happened in the B earnings example above.

(Of course, if B had reported catastrophic numbers and gapped down 15%, you’d be having a very different kind of day. The premium is fat for a reason.)

Common IV Mistakes Wheel Traders Make

Even traders who understand IV conceptually still make these mistakes in practice:

1. Chasing high IV on junk stocks. This is the biggest one. Selling puts on garbage companies just because IV is high and the premium looks fat. IV is high on that biotech penny stock for a reason, namely the market is pricing in the real possibility it goes to zero. High IV on a stock you’d never want to own is not an opportunity. It’s a trap. The Wheel only works (long-term) on stocks you’d be happy to own at the strike price.
2. Confusing high IV with “guaranteed” high returns. High IV means high uncertainty, not free money. The fat premium is compensation for elevated risk. The market is telling you it expects bigger moves, and bigger moves can go against you just as easily as they can go in your favor.
3. Selling when IV is at rock bottom. You’re collecting pennies for the same capital commitment. If IV is at its 52-week low, premiums are thin and you’re not being adequately compensated for tying up your capital.
4. Ignoring why IV is elevated. Not all high IV is equal. IV elevated because of routine earnings uncertainty is very different from IV elevated because the company might be facing bankruptcy, a fraud investigation, or a sector-wide collapse. Context matters.
5. Treating IV as static. IV changes constantly. The premium you sold at 55% IV may look very different if IV drops to 35% (good for you, IV crush) or spikes to 75% (bad for you, your short option is now worth more than you sold it for).

Note: Number one is the one that wrecks accounts. Ask anyone on r/thetagang who sold puts on a “high IV” stock they’d never heard of two weeks ago. They’ll tell you.)

Where to Go from Here

IV is the market’s forecast of future movement. It drives premium levels. And IV crush is the mechanism that makes selling around catalysts both lucrative and risky.

Context matters more than the raw IV number.

IV Rank, IV Percentile, and stock quality all determine whether elevated IV is an opportunity or a trap.

IV is a tool, not a theory. Use it alongside delta and theta to build a repeatable system for your Wheel trades.