Collar Calculator

By Yojana Mandon · Updated June 2026 · 2 min read · Risk disclaimer

A collar protects a stock position by buying a put and financing it with a covered call. It caps both downside and upside — low-cost insurance for gains you want to keep.

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Key characteristics

• The put sets a floor; the call caps the upside and pays for the put.
• Often built for little or no net cost.
• Ideal for protecting an appreciated long-term holding.

When to use a collar

Use a collar to protect gains on a stock you own without selling it. You buy a protective put to set a floor and sell a covered call to pay for that put, bracketing your position between the two strikes.

It is ideal after a big run-up, when you want to lock in most of the gain through an uncertain period but stay invested for tax or conviction reasons.

The trade-off

The put guarantees a floor; the call caps your upside and finances the protection — often making the collar cost little or nothing to put on (a "zero-cost collar").

The cost is opportunity: if the stock keeps rallying past the call strike, your shares are called away and you miss the rest. You are trading some upside for downside certainty.

On the Greeks, the Collar is close to vega-neutral, so implied-volatility shifts have little net effect.

Managing the trade and common mistakes

Once a collar is on, the main lever experienced traders reach for is the short call. If the stock rallies toward your call strike early in the cycle and that call has lost most of its value, you can buy it back and sell a higher-strike call further out in time — a roll-up-and-out — to let the position breathe and collect fresh credit. On the downside, if the stock slides sharply, you can close the put early to harvest its gained value, or roll the put up to lock in a higher floor before the move reverses.

The assignment nuance that trips up beginners: the short call can be exercised early if it goes deep in-the-money, especially just before an ex-dividend date when it becomes rational for the call buyer to capture the dividend. Check the dividend calendar before expiration and consider rolling the call out or closing it before that date if intrinsic value substantially exceeds time value. At expiration, if the stock pins near your call strike, do not assume you are safe — pin risk means you could be assigned and simultaneously need to exercise your put; closing both legs the day before avoids that ambiguity.

The most common beginner mistake is choosing the call strike based purely on premium rather than on where they would genuinely be content to surrender the shares. Setting the call too close to the current price often means giving up the stock in a modest rally — exactly the outcome they were trying to avoid. A second mistake is letting the entire structure expire without re-evaluating: if circumstances change before expiration, rolling the collar or simply removing one leg may be far better than sitting idle until expiry day.

Calculate it live

Use the free OptionProfit Collar calculator to load a live option chain, build the trade, and instantly see the payoff chart, breakevens, probability of profit, Greeks and a Monte Carlo simulation of outcomes.

Frequently asked questions

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