Equity investors generally accept that markets fluctuate. What can be more difficult, however, is managing the impact of a sharp and unexpected decline—particularly when a portfolio has been built over several years and the investor does not want to sell quality investments simply because markets have become volatile.
This is where portfolio insurance through index put options can play a role.
A put option can provide a defined downside hedge: the investor pays a premium upfront for the right to receive value from the option if the underlying index falls below the selected strike price. NSE describes index options as contracts giving the buyer a right, but not an obligation, in return for a premium. NIFTY 50 options are currently available as European-style index options on the NIFTY 50. (NSE India)
What is portfolio insurance?
Think of portfolio insurance in much the same way as other forms of insurance.
You own an investment portfolio because you want to participate in long-term equity growth. At the same time, you recognise that a significant market correction can temporarily—or sometimes substantially—reduce its value.
Instead of selling the portfolio in anticipation of a possible correction, an investor can purchase NIFTY 50 put options as a hedge.
The put is designed to gain value when the NIFTY 50 falls sufficiently below its strike price. That gain can partially offset losses in an equity portfolio that broadly moves with the index.
Importantly, this is not a guarantee that the entire portfolio will be protected. The effectiveness depends on factors such as the portfolio’s relationship with the NIFTY 50, the strike selected, option premium, expiry, volatility and the timing of the hedge.
A simple NIFTY 50 example
Let’s consider an illustrative portfolio of ₹1 crore.
Suppose, purely for illustration, that the NIFTY 50 is trading at:
NIFTY 50 = 25,000
An investor wants protection against a substantial market decline but does not necessarily want to pay for protection starting from the current market level.
One approach is to purchase a 5% out-of-the-money (OTM) NIFTY 50 put.
Calculating the strike
5% below 25,000:
25,000 × 95% = 23,750
So the investor would look at a NIFTY 50 put with a strike around 23,750, subject to the strikes actually available for the relevant expiry.
The investor pays a premium for this put.
The result is a strategy with three distinct zones:
| NIFTY 50 at expiry | What happens to the put |
|---|---|
| Above 23,750 | Put may expire with no intrinsic value |
| Around 23,750 | Put approaches the strike |
| Below 23,750 | Put develops intrinsic value |
This means the first 5% of a market decline is not necessarily compensated by the put’s intrinsic value. Instead, the investor has effectively chosen to insure against more severe downside, rather than paying for protection against every small market fluctuation.
Why choose 5% out of the money?
The choice of strike is one of the most important decisions in a hedging programme.
An at-the-money (ATM) put provides protection closer to the current index level but will generally require a higher premium than a sufficiently OTM put, all else equal.
A 5% OTM put, by contrast, establishes a protection level below the current market.
This can make the hedge more targeted toward significant corrections rather than normal day-to-day market volatility.
For example:
NIFTY 50: 25,000
5% OTM strike: 23,750
The investor continues to hold the underlying portfolio and accepts normal market fluctuations above that level while maintaining protection against a deeper decline.
The appropriate strike, however, depends on the investor’s objectives, risk tolerance and the desired cost of protection.
What happens during a market correction?
Suppose the NIFTY 50 falls from 25,000 to 20,000.
That represents a 20% decline.
The 23,750 put would now be substantially in the money. Ignoring premium, transaction costs and other factors, its intrinsic value would be:
23,750 − 20,000 = 3,750 index points
That increase in the put’s value can offset part of the loss in an appropriately hedged portfolio.
The key word is offset.
The hedge does not magically prevent the portfolio from falling. Nor does a NIFTY 50 put perfectly track every portfolio.
A portfolio concentrated in particular sectors, mid-caps, individual stocks or other assets may behave very differently from the NIFTY 50. This creates what is commonly called basis or tracking risk.
SEBI also highlights imperfect correlation between derivatives and the underlying exposure as one of the risks investors need to consider. (Securities and Exchange Board of India)
The cost of protection
Insurance has a cost, and portfolio insurance is no different.
The investor pays the option premium when purchasing the put. If the market remains above the strike through expiry, the option may expire without intrinsic value and the premium paid becomes the cost of the protection.
For illustration, suppose the annualised cost of the chosen hedging programme is 1% of portfolio value.
For a ₹1 crore portfolio:
Illustrative annual hedge cost = ₹1,00,000
This should be viewed as an illustrative assumption, not a guaranteed or universal cost. Actual option premiums can vary significantly depending on volatility, time to expiry, strike, interest rates and market conditions. NSE notes that option premiums are influenced by variables including the underlying price, strike, time to expiry, interest rate and volatility. (NSE India)
A useful way of thinking about the cost is:
The premium is the price paid for transferring part of the downside risk to the option position.
The real value: staying invested
Perhaps the most important benefit of a systematic hedging strategy is behavioural as much as mathematical.
During a sharp correction, investors can face a difficult choice:
Sell investments after a decline—or remain invested despite the uncertainty.
A predefined hedging strategy can provide another framework: maintain the long-term portfolio while using a separate position to address part of the downside risk.
This can be particularly relevant for investors who:
- Have accumulated significant equity wealth
- Want to remain invested for the long term
- Are concerned about large drawdowns
- Do not want to liquidate their portfolio during periods of uncertainty
- Want a predefined risk-management framework
But portfolio insurance is not free protection
There are several important considerations.
First, the put can expire worthless. If the NIFTY 50 does not fall sufficiently, the premium paid may be lost.
Second, protection is not necessarily one-for-one. A NIFTY 50 hedge may not perfectly match an individual portfolio.
Third, protection has to be renewed. Options have finite maturities, so maintaining an ongoing hedge generally requires monitoring and potentially rolling positions.
Fourth, markets can behave differently from expectations. Volatility, option pricing and liquidity can change the economics of a hedge.
SEBI specifically notes that an option holder can lose the entire premium paid if the anticipated price movement does not occur sufficiently before expiry. (Securities and Exchange Board of India)
A disciplined approach to portfolio insurance
Rather than trying to predict exactly when the next market crash will occur, portfolio insurance can be approached as a risk-management process.
A simplified framework could be:
1. Define the portfolio being protected
Determine the value and how closely it relates to the NIFTY 50.
2. Establish the desired protection level
For example, consider a 5% OTM put as an illustrative starting point.
3. Determine the appropriate hedge quantity
The hedge should be based on the portfolio’s exposure and its sensitivity to the NIFTY 50—not simply its rupee value.
4. Select the expiry and monitor the premium
The cost of protection changes with market conditions.
5. Review and rebalance
As portfolio values, index levels and market volatility change, the hedge may need adjustment.
Conclusion
Portfolio insurance using NIFTY 50 put options is not about predicting the next market crash.
It is about preparing for the possibility of one.
A 5% OTM put can be used as an illustrative structure for investors who want to maintain equity exposure while establishing a potential source of downside protection below a defined market level.
For example, with the NIFTY 50 at 25,000, a 23,750 put represents a 5% OTM protection level. If the index subsequently experiences a substantial decline, the put can increase in value and potentially offset part of the losses in a suitably correlated portfolio.
The trade-off is straightforward: the investor pays a premium today in exchange for potential protection tomorrow.
Used thoughtfully, portfolio insurance can therefore become part of a broader wealth-management framework focused not only on generating returns, but also on managing the path those returns take.
Important note
This article is for educational purposes and uses hypothetical figures. It is not investment advice or a recommendation to buy NIFTY 50 put options. Actual option premiums, strikes, expiries, liquidity and hedge effectiveness vary with market conditions. Options involve significant risks, including loss of the premium paid and imperfect hedging. Investors should consider their circumstances and consult an appropriately qualified professional before implementing an options strategy. SEBI notes that derivatives can involve risks different from, and potentially greater than, those associated with traditional investments. (Securities and Exchange Board of India)