Zero-Cost Collar: Free Downside Hedge With a Cap

Key Takeaways

• A zero-cost collar pairs a long put and a short call whose premiums offset to near zero.
• The put sets a price floor; the short call sets a ceiling that funds the protection.
• The trade-off for free protection is giving up gains above the call strike.
• It suits investors protecting unrealized gains in a concentrated stock position.

What It Is

A collar holds a stock, buys a protective put below the current price, and sells a covered call above it. A zero-cost collar picks the call strike so its premium equals the put premium. The hedge then costs nothing, or close to nothing, upfront.

The put creates a floor: you can sell at the put strike no matter how far the stock falls. The short call creates a ceiling: if the stock rises past the call strike, you give up the gains above it. Between the two strikes the stock moves freely.

The Intuition

Buying a put alone protects you but costs money, and that premium is a drag on returns. The zero-cost collar solves the cost problem by selling away the part of the upside you may not need.

If you have a large unrealized gain and mostly want to defend it, the far upside is worth less to you than the protection. Selling a call at a strike you would be content to exit at funds the put. You trade unlimited, uncertain upside for a defined, free floor. That is the bargain at the heart of the structure.

How a Zero Cost Collar Works

The construction and the payoff zones:

Zero-cost collar = long stock + long put (strike Kp) + short call (strike Kc)
  Kp < current price < Kc
  premium(put) ~ premium(call)  ->  net cost ~ 0

Below Kp:  protected, you can sell at Kp (floor)
Kp to Kc:  stock moves freely, you keep gains and losses in this band
Above Kc:  capped, called away at Kc (ceiling)

Strike selection sets the cost and the band. A higher put strike means more protection but a more expensive put, which forces a lower call strike (tighter cap) to stay zero-cost. A wider call strike preserves more upside but collects less premium, which may require a lower put strike (less protection). Truly free is rare; most collars net to a small debit or credit.

Worked Example

You own 100 shares bought at 80, now trading at 100, and you want to protect the gain through an uncertain quarter without spending cash.

You buy a 95 put for 3.00 and sell a 110 call for 3.00. The premiums offset, so the collar costs nothing. Your floor is 95 and your ceiling is 110.

If the stock drops to 80, your put lets you sell at 95, capping the loss far above the open market. If it rises to 120, the short call is assigned and you sell at 110, keeping the gain up to 110 but missing the move above it. If it finishes between 95 and 110, both options expire worthless and you keep the shares and any gain in that band. You paid nothing for a floor at 95, and the cost was the upside above 110.

Common Mistakes

1. Treating "zero cost" as zero opportunity cost. The hedge is free in cash but you surrender all upside above the call strike. In a strong rally that forgone gain can be large.

2. Setting the cap too close. A tight call strike makes the collar cheap but caps you near the current price, so a normal advance gets cut off quickly.

3. Ignoring early assignment and dividends. A short call in the money near an ex-dividend date can be assigned early, taking your shares before you intended and forfeiting the dividend.

4. Forgetting the trade is not truly free in tax terms. Being called away realizes a taxable gain in a taxable account. The cash cost may be zero while the tax cost is not.

5. Rolling mechanically into a falling stock. Repeatedly resetting a collar on a declining position can lock in a low ceiling and limit any recovery. Reassess strikes each cycle.

Frequently Asked Questions

What is a zero cost collar in simple terms? A zero cost collar buys a put to protect a stock and sells a call to pay for that put, so the hedge costs almost nothing. You get a price floor in exchange for capping your upside at the call strike.

How does a zero cost collar affect investment decisions? It lets you defend an unrealized gain without spending cash, at the price of giving up gains above the cap. In the worked example, a 95 put and a 110 call set a free floor at 95 and a ceiling at 110.

What is a real-world example of a zero cost collar? An investor sitting on a large gain in a single stock before earnings buys a put below the price and sells a call above it at matching premiums, locking a free floor while accepting a capped upside.

How can investors use a zero cost collar effectively? Choose a call strike you would genuinely be happy to sell at, set the put where your protection truly matters, and check ex-dividend dates and tax consequences before the call can be assigned.

How is a zero cost collar different from a protective put? A protective put buys downside protection outright and keeps all upside, but costs premium. A zero cost collar funds that put by selling a call, removing the cash cost but capping the upside.

Sources

1. OIC (The Options Industry Council). "Collar (Protective Collar)." https://www.optionseducation.org/strategies/all-strategies/collar-protective-collar
2. Fidelity Learning Center. "Collar (long stock + long put + short call)." https://www.fidelity.com/learning-center/investment-products/options/options-strategy-guide/collar
3. Cboe Options Institute. "Options Education and Strategy Resources." https://www.cboe.com/optionsinstitute/
4. Corporate Finance Institute. "Collar Option Strategy." https://corporatefinanceinstitute.com/resources/derivatives/collar-option-strategy/

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.