Put Option

In one line: A put option gives its buyer the right to sell the underlying at a fixed strike price before expiry, profiting when the underlying falls — it is the fundamental bearish options contract and the classic hedging tool.

In simple words

Buy a put when you expect the price to fall, or to protect a portfolio against a crash. You pay a premium for the right to sell at the strike. If the underlying drops well below the strike, the put gains value. If it doesn't, you lose only the premium. Puts are the insurance policy of the market.

Visual

How a put option works

When you buy a Nifty 20,000 put, you gain the right to 'sell' Nifty at 20,000 no matter how low it falls. If Nifty drops to 19,500, that right is worth 500 points of intrinsic value, credited in cash for index options. Your profit is the intrinsic value at expiry minus the premium. Above the strike, the put has no intrinsic value and expires worthless. The lower the underlying goes, the more the put is worth — up to a maximum when the underlying reaches zero.

Breakeven and payoff

A put's breakeven is the strike minus the premium paid. For a 20,000 put bought at ₹200, breakeven is 19,800 — Nifty must fall below that for you to profit. Below breakeven, every point down is profit; the maximum gain (strike minus premium) occurs if the underlying goes to zero. Like the call, the put offers asymmetric payoff: small capped loss, large potential gain, this time on the downside.

Puts as portfolio insurance

The most important practical use of puts in India is hedging. An investor holding a basket that tracks Nifty can buy Nifty puts so that if the market crashes, the puts' gains offset the portfolio's losses. The premium is the cost of that insurance, just like an annual policy. Done one-for-one against holdings, this is called a Protective Put. It is why demand for puts — and their implied volatility — is structurally high.

Volatility skew: why puts cost more

Equidistant puts often trade at higher implied volatility than calls, a phenomenon called volatility skew or the 'put skew'. Markets tend to fall faster than they rise, and the constant demand for downside protection bids up put prices. Indian index options show a pronounced skew, so a 5%-OTM put is usually more expensive than a 5%-OTM call. Buyers of protection pay for this; sellers of puts are compensated for it.

Practical example (Nifty)

Call vs Put

Why it matters in practice

• Buy puts to profit from a fall, or to hedge holdings against a crash, with risk capped at the premium.
• Breakeven is strike − premium — the underlying must fall below that to profit.
• Puts are the market's insurance: a Protective Put offsets portfolio losses during a decline.
• Volatility skew makes puts structurally more expensive than equidistant calls.

Common mistakes

• Buying puts after a crash has already happened, when implied volatility (and the premium) is already elevated.
• Forgetting to subtract the premium from the strike when calculating breakeven.
• Over-hedging with expensive puts and letting insurance costs erode long-term returns.
• Selling naked puts on indices without respecting the large downside in a fast fall.

What professionals do

Professionals buy puts as insurance when volatility is cheap, not after fear has already spiked the premium. They size hedges to the actual portfolio risk, often use put spreads to cut the cost of protection, and treat the premium as a known, budgeted expense. When selling puts, they do so at strikes where they would happily own the underlying, and they respect that a fast Nifty decline can hurt a naked short put badly.

Frequently Asked Questions

Sources & references

• NSE India
• Zerodha Varsity — Put option

Educational content only — not investment advice.