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The Collar

intermediate6 min read

Finance your downside insurance by selling away some upside — near-free portfolio protection.

A collar combines two strategies you already know into elegant, cheap protection for a stock you own: you buy a protective putBuying a put to insure a stock holding against a fall. (the floor) AND sell a covered callSelling a call on stock you own to earn income. (the ceiling). The premium from the callThe right, not the obligation, to buy or sell at a set price. you sell helps pay for the putThe right, not the obligation, to buy or sell at a set price. you buy.

The collar’s genius is using the **covered callSelling a call on stock you own to earn income. to fund the protective putBuying a put to insure a stock holding against a fall.* — so you get downside insurance for little or no net cost. The trade-off is symmetric and intuitive: you cap your downside* (the putThe right, not the obligation, to buy or sell at a set price. floor) by also capping your upside (the callThe right, not the obligation, to buy or sell at a set price. ceiling). You’re effectively saying “I’ll give up gains above X to be protected below Y, for free.” When the callThe right to buy the underlying at a set price — a bullish bet. premium exactly pays for the putThe right to sell the underlying at a set price — a bearish bet., it’s a zero-cost collar — protection that costs nothing out of pocket. This makes the collar the practical way to protect a holding you don’t want to sell (avoiding the constant premium drag of a standalone protective putBuying a put to insure a stock holding against a fall.): you fence your stock into a defined range you’re comfortable with, for around zero cost. Ideal for protecting large unrealised gains or riding out an uncertain period.
ExampleYou hold a stock at ₹1,000 sitting on big gains. Buy the ₹950 putThe right, not the obligation, to buy or sell at a set price. for ₹25, sell the ₹1,080 callThe right, not the obligation, to buy or sell at a set price. for ₹25 → zero net cost. Now you’re protected below ₹950 and capped above ₹1,080. A crash to ₹800? Your loss stops at ₹950. A rally to ₹1,200? You’re capped at ₹1,080. Free insurance, in exchangeA regulated marketplace where shares are bought and sold. for the upside above the ceiling.
Key takeawayA collar = own the stock + buy a putThe right, not the obligation, to buy or sell at a set price. (floor) + sell a callThe right, not the obligation, to buy or sell at a set price. (ceiling), the callThe right to buy the underlying at a set price — a bullish bet. funding the putThe right to sell the underlying at a set price — a bearish bet. — often zero net cost. It caps both downside and upside, fencing your stock into a defined range. The practical, drag-free way to protect a holding you don’t want to sell.
FAQs
What’s the catch with a zero-cost collar?

You give up upside above the call strike — if the stock soars, you miss the gains beyond the ceiling. It’s “free” in cash terms but not in opportunity: you’ve traded away the big-rally upside for downside protection. That’s a great deal when protecting gains or during uncertainty, less so if you’re strongly bullish.