Protective Put Strategy: Portfolio Insurance

Protective Put: Your Insurance Policy Against Market Crashes

A protective put holds shares (or an index exposure) while buying a put option as insurance. If markets crash, the put pays - your downside is capped at the strike - proving you the most direct hedge in options. This article explains how it works, exactly what it costs, how to pick the strike, and the tax and practical considerations for Indian investors.

The Mechanics in One Example

You hold a NIFTY-mimicking portfolio worth ₹12,00,000, or simply want to hedge your long in a big-cap stock. NIFTY at 24,600:

• Buy 24,000 put (600 points OTM), premium ₹150/unit
• Each lot protects 25 units = 600 points of downside on ₹6.15L notional
• Max loss on the protected portion if NIFTY crashes below 24,000: only the 600-point gap plus the premium

Below the strike the put's intrinsic value grows point-for-point, neutralising the portfolio's loss. Above the strike the put expires, and you are left holding the equity with a smile - protected but slightly poorer by the premium.

What Insurance Really Costs

The premium is the bill: often 1-2% of notional per month for a modest OTM put in reasonable markets, spiking higher in fear. Annualised, real hedging can run 8-15% of notional for continuous protection, which is why permanent hedging is a drag and temporary hedging (before known events or after big rallies) is the sensible compromise.

There is also an opportunity cost: in a flat or rising market the portfolio lags by the premium + slippage. The skill is deciding when the insurance is worth paying, not trying to avoid the cost, which by definition is negative-carry.

Choosing the Strike: The Insurance Deductible

Just like health insurance, the deductible depends on risk tolerance:

• 4-6% OTM (cheaper, higher deductible): covers crash tail events
• 1-3% OTM (costlier, tighter): covers ordinary corrections
• ATM (full insurance): expensive; rarely optimal

Professional hedgers generally select puts in the 5-8 delta to 10-15 delta range and treat the gap to full protection as their "deductible."

Rolling and Adjusting

• Roll down: if spot falls, buy back the put and buy a lower strike, keeping intrinsic value and resetting protection lower
• Roll out: if volatility has spiked (options dear), wait or buy a closer expiry and roll at the event's resolution
• Scale out: as your bullish conviction rises, sell a call against half the protection (a collar) to cut the net cost

Protective Put vs Other Hedges

Indian Market Practicalities

Index puts (NIFTY, Bank NIFTY) are cash-settled - clean and easy. Single-stock puts hedge only that stock's crash, not the portfolio, and margins/costs behave differently. Remember that holding a put past expiry with ITM value triggers settlement mechanics automatically; decide an exit before the last Thursday. On taxes, the put gains are business income for traders; for hedged investors consult your CA on classification.

SEBI Disclaimer

Options trading involves substantial risk. This article is educational only and is not investment advice. Hedging reduces, but does not eliminate, market risk.

Working a Hedge on Bank Nifty

The protective put on an index portfolio is the same insurance applied to a book of positions rather than a single stock. Imagine holding a 5-lakh-rupee Bank Nifty long exposure near 58,000 with the index down-trending; buying the 57,500 put for 900 per unit on the current lot size creates a floor close to 1.6 percent below the market while the upside stays uncapped. The hedge converts a naked long into a long with a known worst case; this is why the structure is called portfolio insurance, not stock insurance, because it insures the book against everything at once.

Choosing the Strike: The Insurance Deductible

Strike selection is deductible selection. A put 1 percent below spot costs far less but leaves the first drop to your account; a put at the money costs noticeably more but transfers nearly all of the near-term downside. The professional default is a strike that matches the risk budget: if the account can absorb a 3 percent index fall, buy the put 3 percent below spot and pocket the cheaper premium. Confirm the strike on IV rank as well, since buying a deep put into a volatility spike pays for fear that a calm week will not sell back.

Hedging Cost as a Percentage of the Book

Good hedging is priced in percentage terms before it is measured in rupees. A 1.2 percent quarterly put cost on a book that can drop 15 percent in a bad quarter is a bargain; the same cost on a book you confidently expect to rise is wasted money. Set the budget yearly: expected hedge cost near 2 to 4 percent of the notional covered, revisit quarterly, and let the market tell you when protection is cheap by watching IV rank and the put-call ratios. Hedges are the only positions where the premium paid and the peace granted arrive inversely.

Collar Conversion to Pay for the Put

When the put looks expensive, sell an out-of-the-money call against the same exposure to fund it. Nifty near 26,000, buying the 25,700 put while selling the 26,300 call can reduce the net cost to near zero when the strikes are chosen so the call premium covers the put. The price of the free insurance is a capped upside: the book's gains beyond 26,300 belong to the call buyer. The collar is the family car of hedging - slow, simple, and remarkably good at not crashing - and it suits investors who would rather stay on trend than max out one lucky month.

The Exit: Unwinding Protection

Hedges have their own life cycle. Sell the protection when the thesis that required it passes: after the event, after the decline has been absorbed, or when IV spikes make the put worth more than its insurance logic. Buying high-VIX and selling low-VIX is exactly backwards, so time the unwind by rolling IV rank, not by price. Document each hedge's entry, its cost, the worst-case it guaranteed, and its exit, because a journaled hedge book is the only reliable evidence that insurance added value over the year rather than merely consumed it.

1. Insure the book with a strike inside the risk budget.
2. Budget hedge cost as a percentage of covered notional.
3. Fund the put with a collar when IV is rich.
4. Exit protection by IV rank, not by pain tolerance.
5. Note each hedge's cost and worst-case guarantee for the annual summary.

The Vega of Your Insurance and the Rebalance Schedule

A put hedge is alive: its vega rises and falls with the volatility the market quotes, so the same protection costs more into a spike and less into calm, and the discipline is to buy protection in calm and roll it out of spikes rather than the reverse. The rebalance schedule keeps the hedge honest: on each milestone review, compare the hedge's current strike and days-to-expiry against the book's exposure, and roll or re-layer so the coverage matches the thesis instead of the memory of the entry. The vega and the schedule together mean the hedge is a managed position with its own rules, not a receipt the portfolio signed and forgot. A hedge rebalanced on the calendar is insurance the portfolio can actually use.