Hedging with index options means buying protection against a market fall while keeping your holdings. You pay a premium, you get a floor under your losses, and you keep most of the upside.
The part usually left out is that this is insurance, and insurance is priced to be profitable for the seller. Over a long enough period, continuously hedging costs more than the losses it prevents. That does not make it a bad idea. It makes it a decision with a price, and the useful question is what you are buying with that price rather than whether the price exists.
Everything below uses illustrative round numbers, not live prices. Contract specifications change and are cited to source rather than quoted. Read the disclaimer at the foot.
What a protective put does
Buy a put below the current index level. If the market falls past that strike, the put gains roughly what your portfolio loses, and your losses stop there.
That gap between the lines is the whole trade. You have converted an unlimited-downside position into one with a known floor, and you paid for it with a permanent, certain reduction in every other outcome.
The collar: paying for the put by selling upside
If the premium is uncomfortable, sell a call above the market to fund it. Choose strikes so the call premium roughly matches the put premium and the structure costs close to nothing at entry.
The phrase “zero-cost collar” is one of the more misleading pieces of vocabulary in the business. It costs nothing at entry and can cost a great deal at expiry, because the thing you sold is precisely the outcome you were hoping for.
Sizing the hedge
The arithmetic is straightforward and the two inputs are worth being careful about.
Contract value is the index level times the lot size, which gives the notional exposure one contract covers. Divide your portfolio value by that and you have the number of contracts for a one-to-one hedge.
Beta adjusts for the fact that your holdings probably do not move exactly with the index. A portfolio with a beta of 1.2 needs roughly 20 percent more index protection than its rupee value suggests, because it falls further than the index when the index falls.
Two practical wrinkles follow. Contracts are indivisible, so you will usually be slightly over or under hedged, and rounding up costs premium while rounding down leaves a gap. And beta is estimated from history, so it is least reliable during exactly the sharp move you are hedging against, when correlations rise and most things fall together.
Lot sizes, strike intervals and expiry schedules for Indian index derivatives have all changed more than once in recent years. Take them from the NSE derivatives documentation or the current circulars rather than from any article, including this one, because a hedge sized against a stale contract specification is simply the wrong size.
What it actually costs
This is the section that decides whether you should hedge at all.
A put five percent out of the money over one to two months typically costs a fraction of a percent of the notional it protects. That sounds trivial. Repeated continuously, it is not: a hedge costing half a percent every two months is roughly three percent a year, drawn from a portfolio whose long-run expected return might be low double digits. You are surrendering a meaningful share of your expected return, every year, in exchange for a floor you will rarely touch.
Add the costs around the premium. Every leg carries brokerage, exchange charges, GST, stamp duty and securities transaction tax, and STT on options is levied on the sell side, so closing a hedge early has its own cost. Current rates are on the NSE securities transaction tax page.
There is also a timing problem. Protection is cheapest when nobody wants it and expensive once a fall has begun, because implied volatility rises with fear. The natural moment to hedge is the worst moment to buy the hedge, and hedging after a decline mostly means paying a high price to protect against a move that has already happened.
How much to hedge
Hedging is not binary, and treating it as such is a common and expensive mistake.
A full hedge, protecting the entire portfolio value, costs the most and removes the most risk. A partial hedge covering half the portfolio costs half as much and floors half the loss. Since the premium scales roughly linearly with the notional protected, but your discomfort with losses usually does not, a partial hedge is often the better trade: it clips the worst of a fall while leaving most of the expected return intact.
The useful framing is to work backwards from the outcome you are trying to avoid. If a 30 percent fall would force you to sell at the bottom, but a 15 percent fall would not, then you do not need protection against the first 15 percent. You need protection against what lies beyond it. Buying a put a long way out of the money is far cheaper than an at-the-money one and addresses the actual problem, which is not volatility but the point at which you stop behaving rationally.
That threshold is personal, it is not a market variable, and it is worth writing down before a falling market helps you discover it.
Put spreads: cheaper protection with a hole in it
Instead of buying a put outright, buy one and sell a further put below it. The premium received on the lower strike reduces the cost, sometimes substantially.
The catch is exactly where you would expect. Your protection now runs only from the upper strike down to the lower one. Below that, you are unhedged again and falling at full speed, which means you have insured the moderate decline and left the catastrophe uncovered.
Whether that is sensible depends on what you are actually afraid of. If the concern is a normal correction, a put spread covers it at a fraction of the cost. If the concern is a genuine crash, a put spread is close to useless for the scenario that matters, and paying more for an outright put is the honest choice.
The general rule holds across all of these structures: any option strategy that is cheaper has given something up, and the thing it gave up is usually protection in the tail. Finding out which part you sold, before you need it, is the entire skill.
When hedging is the wrong tool
Continuous hedging is usually the expensive answer to a question with a cheaper one.
If the portfolio is simply too large for your tolerance, hold less of it. Selling some equity costs a transaction and possibly tax. Hedging costs a recurring premium forever. For a permanent reduction in risk, the permanent solution is usually cheaper, and this is really a portfolio construction question rather than a hedging one.
If you are worried about a specific dated event, a hedge over that window is defensible, because you have a defined start and end rather than an open-ended subscription.
If you cannot sell for a reason, a lock-in, a tax consequence, a concentrated holding you are unable to exit, hedging earns its keep. This is its strongest use.
The distinction is whether the risk is temporary or structural. Hedging is a good answer to temporary and a poor answer to structural.
Practical notes
Cash settlement removes delivery risk. Index options settle in cash, so a hedge that finishes in the money pays out without any obligation to deliver stock.
The short call in a collar needs margin. Selling that call is not free of capital requirements, and the margin can rise while the position is open, which is covered in risk management.
Basis risk is real. Your portfolio is not the index. A hedge on NIFTY protects against a market fall and does nothing about a fall confined to your holdings, which is precisely the risk diversification was supposed to address.
Tax treatment of derivatives differs from equity, and hedging gains and losses do not always offset the underlying position cleanly. This is worth confirming for your own circumstances rather than assuming.
Liquidity concentrates in the near expiry and near the money. Far-dated, deep out-of-the-money strikes are exactly what a long-horizon hedge wants and exactly where spreads are widest, so the quoted premium understates what the hedge costs to establish and unwind.
Where to go next
For the structures on the other side of this trade, where you are the one selling the insurance, see credit spreads and iron condors and butterfly option structures. For sizing and drawdown limits, risk management. And to test whether a hedging programme actually improved risk-adjusted returns after costs, rather than merely feeling safer, quantitative analysis.
Hedging buys certainty, and certainty has a price. Decide what that certainty is worth to you before you buy it, and be honest that in most years you will pay the premium and receive nothing in return. That is not the hedge failing. That is what insurance looks like when the house does not burn down.