IV Rank, IV Crush and Earnings - when volatility eats the profit

The price of an option is 50% the price of the stock and 50% the price of volatility. IV Rank tells you whether volatility is cheap or expensive relative to the past year. IV Crush is the moment that volatility disappears after an event. Earnings are the IV Crush factory. If you buy options before earnings without measuring IV, you are playing against the math.

This lesson teaches you to measure how expensive an option is and not to end up on the wrong side of the crush.

Implied Volatility - the price of fear

IV is the annual volatility the market expects, priced into the option.

Option price = Intrinsic value + Time value (dependent on IV and DTE)

High IV = expensive options (the market is afraid of a move)
Low IV = cheap options (the market is bored)

Example:
SPY 450, Call 450 30 DTE, price 8.00 at IV 20%
The same Call at IV 40% will cost ~15.00
The difference of 7.00 is only a change in the volatility expectation, the stock has not moved.

Measure IV as a price, not a forecast. An IV of 80% does not mean the stock will make an 80% move. It means options are expensive and the market-maker is hedging against a large move.

IV Rank and IV Percentile - a thermometer of expensiveness

You need context. An IV of 45% can be expensive for SPY and cheap for TSLA.

IV Rank = (Current IV - Min IV 52w) / (Max IV 52w - Min IV 52w) * 100

IV Rank 0 = cheapest of the year
IV Rank 100 = most expensive of the year
IV Rank 50 = exactly in the middle

Practical interpretation:
IVR < 20 = cheap → buy premium (long call/put, debit spreads) instead of selling
IVR 20-50 = average → neutral strategies, smaller positions
IVR > 50 = expensive → selling premium (credit spreads, Iron Condor) has the edge
IVR > 80 = very expensive → best for selling, but watch the event (where is this expensiveness coming from?)

IV Percentile is the % of days in the year when IV was lower than the current level. Similar, but weighted by time. For a retail trader, use IV Rank - it is simpler.

Decision table:

Always check: why is IV Rank high? If earnings are in 2 days, a high IVR is a trap, because the crush is about to wipe out the value.

IV Crush - the anatomy

IV Crush is the drop in IV after a binary event. The most common example: earnings.

The mechanism:

Before earnings: IV = 80-150% because the market does not know whether it will be +10% or -10%
After earnings: The uncertainty disappears, IV falls to 30-40% in a second
The option price drops by 30-70% even though the stock may even move in your direction

A real example (schematic):
AAPL before earnings: price 180, Call 180 3 DTE cost 5.00 at IV 70%
AAPL after earnings +3% (183), IV falls to 35%
The Call 180, even though it is ITM by 3, falls to 3.50 because the time value evaporated
Long call + correct direction = a loss of -1.50

The formula for the expected move from the option price (an approximation):

Expected move % ≈ Price of the nearest ATM straddle / Stock price * 100

Example: Straddle 180 Call + Put = 10 USD, stock 180
Expected move = 10/180 = 5.5% in one direction
If earnings deliver 3%, the long straddle loses despite the move.

Measure: If the expected move > the historical average move after earnings (e.g. 4% versus an average of 5% over the last 8 quarters), long premium may make sense. If expected > historical, the market has already priced it in.

Earnings - how not to get eaten

Earnings are the worst moment to be long options for a beginner and the best moment for premium sellers - if they know how to manage the gap.

Procedures:

If you want to play direction before earnings:

Step 1: Check IV Rank and the expected move
Step 2: If IVR > 70, do not buy a naked long call/put. Buy a debit spread (Bull Call Spread) to cut Vega.
A debit spread loses less on the crush because the short leg loses too.

Step 3: Size = max 0.5% of the account, because this is a binary bet.
Step 4: Alternative: trade the day after earnings, when IV is low and the trend is already known. You miss the first move, you gain the absence of the crush.

The formula for a debit spread before earnings:
Buy an ATM Call, Sell an OTM Call 1 strike higher.
Max loss = the debit, Max profit is limited, but Vega is ~50% smaller than naked.

If you want to sell premium through earnings:

Never a tight Iron Condor 0-7 DTE. An 8% gap and you have the max loss.
If you do sell, then: wide spreads, small size, or after earnings (the next day, when IV is already low, but still higher than it will be in 5 days).

The best moment to sell after earnings: the day after the crush, when IV Rank is still 40-60 (because before it was 90). You sell after the crush, but still expensive relative to normality.

The rule: Do not hold short premium through earnings if the loss at the max move (expected move * 1.5) > 3% of the account.

Vega and Theta before and after the crush

Measure the exposure:

Before earnings:
Long option: +Vega large, -Theta small per day, but the crush -Vega dominates
Short spread: -Vega large (you profit on the crush), +Theta

After earnings:
IV falls, Vega falls, Theta becomes the main driver.

A log before every earnings trade:

Ticker | Earnings date | IV Rank now | Expected move from options | Average hist move 8Q | Position Vega in USD | Do I play? YES/NO

If expected > the historical average by >20%, playing long premium is statistically a losing game.

When the plan says do not trade

1. When IV Rank > 70 and you do not know why (you have not checked the earnings, FDA or CPI calendar). A high IVR is not an invitation, it is often a warning. Check the event.
2. When you want to buy a Call/Put 0-3 DTE before earnings because “it is cheap, 2 USD”. That is not cheap, that is 200% IV. After the crush it will be 0.50 even if the direction is right. Do not trade the lottery.
3. When your position Vega > 2x the daily Theta * remaining DTE. Around earnings, Vega will kill you in a second. Reduce Vega or close.
4. When the expected move > 2x ATR(14) D1, and you have an Iron Condor in the middle of that range. The gap will land outside the condor, max loss.
5. When, after 3 losing earnings trades in a row, you want to “win it back” with a bigger position. Earnings are not an income strategy. Take a 2-week break.

The mistakes that cost the most

A measurable exercise

Title: 20 earnings events - expected vs actual

1. Over 1 month, pick 20 companies before earnings (2-3 per week). For each one, record the day before: Price, ATM straddle price, Expected move % = straddle/price, IV Rank, Average move after the last 8 earnings (you will find it on OptionCharts or Earnhub).
2. The day after earnings, record: Actual move %, IV after (the drop), What would have happened to an ATM long call/put.
3. Calculate:

% of times when expected > actual (the market overestimates)
Average IV crush in %
How many times an ATM long straddle would have been profitable

4. Draw a conclusion: what expected/historical ratio is needed for long premium to have a chance?

Pass criterion: 20 entries + the calculated % of overestimation. You will see that the market overestimates the move before earnings in 65-75% of cases.

Test yourself

1. What is an IV Rank of 85 and what does it say about the option price?
2. A company trades at 100 USD with an ATM straddle at 8 USD before earnings. What is the expected move %? If the average historical move is 4%, does buying the straddle make statistical sense?
3. Why can a long call lose despite the stock rising after earnings?
4. You hold an Iron Condor before earnings with Vega -80 USD. IV falls 20 points after earnings. How much do you gain on Vega?
5. Give 2 ways to reduce Vega risk before earnings for someone who wants to stay in the position.

Frequently asked questions

Where can I find IV Rank? It is built in on Tastyworks, TOS and IBKR. On the Warsaw Stock Exchange (GPW) you have to calculate it yourself: you take IV from the Black-Scholes formula using the OW20 price, and record the 52-week min/max. There is no ready-made indicator.

Does IV Rank work on the GPW? Yes, but it is weaker, because the lack of many series and low liquidity = noisy IV. It is worth calculating, but the thresholds are different: an IVR > 60 on the OW20 (WIG20 index options) is already high (because the WIG20 is jumpy).

Can I make money on IV Crush by buying options? No, the premium seller profits on the crush. The buyer loses. You can profit from the crush indirectly, by waiting for IV to fall and buying cheaper options for the next move.

Are earnings a good time for the Wheel? No. An assignment right after earnings means buying at high volatility. It is better to wait 1-2 days after earnings, when IV is already low.

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Educational material. This is not investment advice or a recommendation. Every trading decision is your own risk. Measure volatility before you measure profit.

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