India VIX and Implied Volatility: How to Use Them Before Buying or Selling Options

Key Takeaways

1. India VIX reflects the market's expectation of Nifty 50 volatility over the next 30 calendar days, based on Nifty option prices.
2. Implied volatility reflects the volatility implied by an option’s market price. Other factors being equal, higher IV generally means higher option premiums.
3. In options trading, higher implied volatility generally increases premium, all else being equal. Buyers may pay more, while sellers may collect more premium but remain exposed to significant losses.
4. Implied volatility may drop after big events such as results or policy announcements, which can reduce option premiums even if the price moves in your favour.
5. India VIX and implied volatility indicate expected volatility, not market direction. Comparing IV with its historical levels can provide context, but it does not by itself show whether an option is fairly priced.

You buy a call option, the stock moves up as expected, and yet your option barely gains. What went wrong?

Often, the answer lies in volatility. In options trading, the price you pay depends not only on where the market is today but also on how much the market expects it to move. Two numbers help you read this expectation: India VIX and implied volatility.

This blog explains what India VIX and implied volatility mean, how they affect option premiums, and what to consider before buying or selling options.

What Is India VIX?

India VIX is a volatility index calculated by NSE. It is based on the best bid ask quotes of Nifty 50 index options and reflects the volatility the market expects over the next 30 calendar days.

The figure is an annualised percentage. For example, a reading of 15 indicates an annualised expected volatility of about 15% over the next 30 calendar days. It does not mean Nifty will definitely rise or fall by 15%, or that its movement will stay within a fixed range.

India VIX is sometimes called the "fear index". It often rises during sharp market falls or ahead of major events, and tends to ease when markets are calmer. However, it does not indicate the direction of the market.

What Is Implied Volatility?

Implied volatility (IV) is the level of volatility the market is pricing into a particular option. India VIX gives you a view of the overall Nifty market, while IV is specific to each option contract, whether it is on an index or a stock.

IV is worked backwards from the option's premium using a pricing model. If the option's price rises while other pricing factors remain unchanged, its implied volatility will generally rise too.

Here's a simple way to compare the two:

How Volatility Affects Option Premiums

An option premium consists of intrinsic value, if any,  and extrinsic value, often known as time value. Implied volatility affects the option's premium, with the impact depending on factors such as the option type, strike price and time to expiry.

Higher  IV indicates that greater price fluctuations are being priced into the option. When IV is low, premiums may be lower. This is why an option's premium can differ before and after a major event, even if its strike price is unchanged.

In options trading, the sensitivity of an option's price to changes in IV is called Vega. Other factors being equal, options with more time to expiry generally have higher Vega.

How to Use India VIX and IV Before Buying Options

Check whether IV is high or low compared with its own history. An IV of 20% may be high for one stock and normal for another, so compare it with its recent range.

Be careful around events. Implied Volatility may rise before results, budget announcements or policy meetings, and may drop  once the news is out as the uncertainty decreases. This is known as an IV crush. An option buyer can lose value from a fall in IV, even if the underlying price moves in the expected direction.

Factor volatility into your expectations. Higher IV generally means a higher option premium, all else being equal. Before buying, consider the premium paid, the breakeven level at expiry and how much the underlying may need to move for the trade to become profitable. India VIX provides broader context for Nifty 50 volatility, but it is not a substitute for checking the IV of the specific option.

How to Use India VIX and IV Before Selling Options

In options trading, higher IV generally means a higher premium for a comparable option, all other factors being equal. However, higher expected volatility can also mean larger price swings, which may increase the risk of an option-selling position.

Option sellers must meet applicable margin requirements and can face substantial losses, particularly on uncovered positions. If IV rises after an option is sold, its premium may increase and create a mark-to-market loss even when the underlying price has moved very little. 

So, a seller should look at IV along with margin, position size and the possible move in the underlying, not at premium alone.

Common Doubts About India VIX and Implied Volatility

Does a high India VIX mean the market will fall?

Not necessarily. India VIX measures the expected size of moves, not their direction. It often rises during falls, but it can also rise ahead of events.

Is a low IV always good for option buyers?

Not necessarily. Low IV may mean that less volatility is priced into an option, but it does not automatically make the option a good purchase. The premium can still lose value because of time decay or changes in the underlying price. Consider the option's price, expiry, strike and potential risks before trading.

Can IV change during the day?

Yes. IV changes with option prices and can shift quickly around news.

How mastertrust Helps With Options Trading

mastertrust offers trading services for eligible futures and options (F&O) contracts on its platform at mastertrust.co.in 

You can use the available platform features to review option chains, premiums and your positions, subject to the applicable account and trading requirements.

If you are new to options, you can read our guide on options trading in India and learn how market volatility impacts futures and options trading.

Final Thoughts

India VIX measures the market's expected volatility for the Nifty 50 over the next 30 calendar days, while implied volatility reflects the volatility priced into a specific option.

Neither measure predicts  the market direction or guarantees how much prices will move. Checking both can help you understand volatility expectations, but your options trading decision should also consider the option premium, strike, expiry, break-even level and potential risk.

Frequently Asked Questions (FAQ)

1. What is a normal level for India VIX?

There is no definite level. In most cases, traders compare the current India VIX to the previous ranges and consider the prevailing market conditions.

2. How is implied volatility different from historical volatility?

Historical volatility measures how much the price has moved in the past. Implied volatility reflects how much movement the market expects in the future, based on option prices.

3. Why did my option lose value after the results announcement?

One possible reason is an IV crush. Implied volatility may fall after an event as uncertainty reduces, which can lower the option premium. Changes in the underlying price and time decay can also affect the option's value.

4. Should I avoid options trading when India VIX is high?

Not necessarily. A high India VIX indicates higher expected volatility for the Nifty 50. Option premiums depend on the IV of each contract and other pricing factors. Consider your strategy, risk tolerance, available capital and potential losses before trading.

5. Where can I track options trading data with mastertrust?

You can check option premiums and related data through the option chain on the mastertrust platform.