High IV rank vs low IV rank: rich premium, and the reason it is rich
IV rank tells you whether an option's implied volatility is high or low compared with its own past year. High rank means richer premium. It also means the market expects a bigger move, which is why the premium is rich.
The short answer
Implied volatility (IV) is the market's guess at how much a stock will move, baked into option prices. IV rank scores today's IV from 0 to 100 against the past year: 0 means it is at the year's low, 100 at the year's high, 50 halfway.
High IV rank (say 50 and up) means premiums are fat compared with this stock's normal. Sellers like that. It also usually means something is coming: earnings, a lawsuit, a sector scare, or a drop that already started.
Low IV rank (say under 20) means premiums are thin compared with normal. Selling collects less. The stock is also, by the market's guess, calmer.
The premium is a price. High IV rank is the market charging more because it sees more risk. Both halves of that sentence are true at once.
Side by side
| High IV rank | Low IV rank | |
|---|---|---|
| Where IV sits vs its past year | Near the top | Near the bottom |
| Premium for the same delta | Bigger | Smaller |
| Strike for the same premium | Further from the price | Closer to the price |
| What the market expects | A bigger move | A smaller move |
| Usual cause | Earnings, news, a sell-off | A quiet stretch |
| If IV falls after you sell | The option cheapens; you can close early | Little room for IV to fall |
| If IV rises after you sell | Less likely, but it can | The option gets pricier; paper loss |
| The warning | Why is the market scared? | Why is the premium so thin? |
A worked example (an illustration, not a trade idea)
Two months, same stock, XYZ at $50. You sell the same 30-day $45 put each time.
- Low IV rank month (rank 10): the $45 put sells for $0.50. Collect $50.
- High IV rank month (rank 70, a lawsuit in the news): the $45 put sells for $1.50. Collect $150. A $42 put would pay what the $45 did in the quiet month.
| XYZ at expiry | Low-rank month ($45 put, $0.50) | High-rank month ($45 put, $1.50) |
|---|---|---|
| $52 | +$50 | +$150 |
| $47 | +$50 | +$150 |
| $43 | Assigned at $45, worth $43: −$200 + $50 = −$150 | −$200 + $150 = −$50 |
| $36 (the lawsuit went badly) | −$900 + $50 = −$850 | −$900 + $150 = −$750 |
Two honest readings.
- The high-rank premium helped in every row. It is a bigger cushion. On the same drop it lost $100 less.
- The high-rank month is the one where the $36 row happens. The quiet month rarely produces a 28% drop. The scared month produces it far more often. That is what the extra $100 was paying for, and $100 does not cover $900.
The premium is not a prediction. It is an insurance price. When it goes up, the odds of the thing it insures against went up too.
What to do with high IV rank
- Check why. If it is earnings inside your expiry, that is a binary event, not a sale. Many sellers skip it or wait until after the report.
- Use the room, not the size. A high-rank month lets you sell a further strike for a normal premium. That buys cushion. Selling the same strike for more money buys nothing but a bigger number.
- Size for the move the market is pricing. If IV implies a $6 move and you have cash for 100 shares, plan for the shares to be $6 lower when they arrive.
- Expect IV to drop after the event. That is the seller's friend; the option cheapens even if the stock does not move. Our guide to implied volatility explained shows how.
What to do with low IV rank
Mostly, accept smaller premiums or trade less. The temptation is to move the strike closer to keep the dollars up. That trades a calm month's cushion for a few extra dollars. See 30 delta vs 16 delta for what a closer strike costs over a year.
The other temptation is to go find a stock with high IV rank instead. Sometimes that is a fine stock having a scary week. Often it is a scary stock. On the wheel strategy, the stock comes first and the IV rank second, because you may own it for months.
IV rank vs IV percentile
They are cousins. IV rank places today's IV between the year's low and high. IV percentile says what share of the year's days had IV below today's. A single spike can push rank down for months while percentile stays honest. If your broker shows both, read both.
Questions
What is a good IV rank for selling options?
Many sellers look for 30 to 50 or higher, because premium is richer than the stock's normal. But a high rank is a warning as well as an opportunity: find out what the market is pricing before you sell.
Does high IV rank mean the stock will move a lot?
It means the market is pricing a bigger move than usual for this stock. Sometimes the move does not come and the premium melts. Sometimes it comes and blows through the strike. The rank tells you the price, not the result.
Should I avoid selling options when IV rank is low?
Not always. Low rank means a smaller premium, and selling closer to the price to make up for it adds risk. Selling smaller, or waiting, are both fine choices.
Is IV rank the same for every stock?
No. It compares a stock with its own past year, so a rank of 50 on a quiet utility is a much smaller expected move than a rank of 50 on a volatile tech name. Compare the dollar expected move too.
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