A zero cost collar (often just “collar” or “costless collar”) is an options hedging strategy that protects gains on a long stock position by simultaneously buying a protective put and selling a covered call with the same expiration. The premium paid for the put is offset (or nearly offset) by the premium received for the call, so the net up‑front cash outlay is zero (or close to zero).
Key takeaways
– A collar limits downside risk (via the long put) and caps upside potential (via the short call).
– It requires owning the underlying stock (typically 100 shares per options contract).
– True “zero cost” depends on option prices — premiums don’t always match, so you may have a small net debit or credit.
– Risks include assignment on the short call, limited upside if the stock rallies strongly, liquidity/spread costs, and tax/transaction effects.
How the zero cost collar works (mechanics)
1. You own long stock (e.g., 100 shares).
2. Buy an out‑of‑the‑money (OTM) put with strike L and expiration date T — this establishes a floor: you can sell the shares at L on or before T.
3. Simultaneously sell an OTM call with strike H (> L) and the same expiration T — this obligates you to sell the shares at H if assigned.
4. Choose L and H so the put premium ≈ call premium; when premiums match, the net premium ≈ $0 — hence “zero cost.”
Example (numbers)
– You bought stock at $100; it’s now $120.
– Buy 1 put (strike $115, cost $0.95) → cost = $0.95 × 100 = $95.
– Sell 1 call (strike $124, receive $0.95) → credit = $95.
– Net upfront cost = $0. Maximum and minimum outcomes at expiration (net cost = 0):
• If stock ≤ $115: your put is exercised; you effectively sell at $115. Your maximum loss relative to your original purchase = $100 − $115 = −$15 per share (i.e., you locked at $115 so you kept a $15 gain relative to your $100 purchase).
• If stock ≥ $124: your short call is exercised; your stock is called away at $124. Maximum gain relative to your $100 purchase = $24 per share.
• If stock closes between $115 and $124: both options expire worthless; you keep the stock and its market price.
Formulas (general)
Let P0 = your purchase price of the stock, L = put strike, H = call strike, net_cost = put_premium − call_premium (positive if you paid net premium).
– Max loss (worst case down to put strike) = (P0 − L) + net_cost
– Max gain (if stock ≥ H) = (H − P0) − net_cost
Is a “costless” collar really costless?
Not always. Options premiums vary with strike, expiration, implied volatility, time value, and liquidity. Perfect premium match is not guaranteed. Even if the premiums net to zero, commissions, fees, and bid/ask spreads create real costs. Also, if you accept a small net credit to get a “costless” profile you may be taking on slightly different strikes (changing the protection/ceiling), so the tradeoff is in the strike selection.
Practical steps to implement a zero cost collar
1. Define your objective: lock in gains, limit downside to an acceptable level, and decide how much upside you’re willing to cap.
2. Confirm you own at least 100 shares per options contract (or plan to buy that many).
3. Choose the time horizon (expiration) consistent with how long you want protection. Short expirations are cheaper but require rolling; longer expirations cost more and reduce flexibility.
4. Select put strike (L): how much downside protection do you want? Higher L = more protection but higher put premium.
5. Select call strike (H): how much upside are you willing to give up? Lower H = smaller upside but higher call premium received.
6. Check option premiums and liquidity: look at bid/ask spreads, open interest, and implied volatility. If premiums don’t match, adjust L or H to approximate zero net cost.
7. Place a simultaneous combination (combo) order: entering the buy-put and sell-call at the same time helps ensure the desired net cost. Many brokers support multi‑leg combo orders.
8. Monitor for early assignment on the short call (especially around dividends) and be prepared to close or roll the options before expiration if market conditions change.
9. At or before expiration decide: let expire, close the options, exercise the put if needed, or roll strikes/expiration forward.
Practical considerations, risks, and trade-offs
– Assignment risk: short American calls can be assigned before expiration, particularly if the underlying is ex‑dividend and the call is in the money. If assigned, you must deliver the shares (or close the short).
– Opportunity cost: upside beyond the short call strike is foregone if the stock surges.
– Liquidity and slippage: wide bid/ask spreads and low open interest can make it costly or impossible to achieve a true zero cost.
– Transaction costs and margin: commissions, exercise/assignment fees, and margin requirements (if using margin) impact results.
– Counterparty and broker constraints: check that your account level supports options writing and combo orders.
– Tax implications: assignment and expiration can trigger capital gains; short-term vs long-term treatment depends on holding periods and local tax rules—consult a tax adviser.
– Model risk: implied volatility changes affect option prices — a sudden rise in IV may make protective puts more expensive to roll.
When to use a zero cost collar
– You have a large unrealized gain and want to protect most of that gain without paying a large premium.
– You want downside protection but don’t want to sell your position and trigger an immediate taxable event.
– You prefer a known floor and ceiling for a defined period.
Alternatives and related strategies
– Protective put: buy only the put — full downside protection but you pay the premium.
– Covered call: sell a call only — generate income but no downside protection.
– Collars with net debit or credit: accept a small net cost to get closer protection, or a net credit but looser protection.
– Fence (three‑leg strategy): uses an extra option to fine‑tune protection and cost.
– Stop‑loss orders: non‑options alternative, but can suffer from gapping and lack of guaranteed price.
Rolling, closing, and post‑expiration actions
– Close both legs prior to expiration if you want to maintain the stock and avoid assignment.
– Roll the collar by buying back the short call and selling a further‑out call and/or buying a later‑expiration put (can involve a cost or credit).
– If the stock is assigned (called away), you sell the shares at H — you may decide to re‑enter the position after assignment if desired.
What is the “risk reversal”?
Terminology varies. In hedging parlance, some traders call the buy‑put/sell‑call combo a “risk reversal” or “equity risk reversal.” In broader options markets, “risk reversal” also commonly describes a long call/short put pair (used to synthetically express directional views). When discussing collars, clarify the context: for protective collars the typical construction is long stock + long put + short call.
Final thoughts
A zero cost collar is a practical, widely used way to lock in gains and define a known risk/reward range without a large upfront cash outlay. It’s not free in the broader sense: you give up potential upside, face assignment risk, and pay implicit costs through spreads, commissions, and taxes. Use a collar when you want downside protection with limited cash cost and are comfortable with sacrificing some upside for a set period. As with all options strategies, ensure you understand the mechanics, monitor the position, and consider consulting a financial or tax professional before executing.
Sources and further reading
– Investopedia — “Zero Cost Collar” (source provided)
– CBOE — Options Institute: Options Basics and Strategy Guides
(1) create a downloadable payoff chart for your specific strikes and purchase price; 2) walk through a live trade example using current option quotes; or 3) list broker order types and sample combo orders to enter a collar.)
(Continuation — additional sections, examples, and concluding summary)
Advanced Considerations and Variations
– Debit versus credit collars: A “zero cost” collar aims for net premium = $0, but in practice you may accept a small net debit (pay) or net credit (receive). A net debit reduces your realized gain; a net credit increases it. Choose strikes to reflect your market view and desired net cash flow.
– Dynamic collars: Rather than holding until expiration, investors can roll strikes or expirations (close and reopen options) as market conditions and objectives change. Rolling can maintain protection but adds transaction costs and can change the effective strike widths.
– The “fence” (three‑leg collar): Adds a third option (often another call or put) to tweak payoff shape (e.g., widen downside protection while keeping costs near zero). This increases complexity and execution risk.
– Synthetic or reverse risk reversal: Note terminology differences—“risk reversal” in options markets can mean different things depending on context (e.g., buying a call and selling a put to synthetically create forward exposure). For protecting a long stock, the standard collar is buy put + sell call.
Practical Steps to Implement a Zero Cost Collar
1. Define objective and time horizon
• Are you locking in short‑term gains, hedging through an earnings announcement, or protecting a longer holding period? Set the expiration accordingly.
2. Identify the shares to protect
• Collars are typically executed on shares you already own (100 shares per option contract).
3. Choose expiration date
• Balance protection duration against option liquidity and premium cost. Longer expirations cost more but require fewer rollovers.
4. Select strike prices
• Decide on the downside protection level (put strike) and the upside cap you accept (call strike). Wider strike separation gives more room for upside but costs more protection—or requires selling a nearer call to offset cost.
5. Calculate premiums and net cost
• Multiply option premiums by 100 per contract. Aim for net premium near zero (or acceptable debit/credit).
6. Place the trades
• Ideally enter as a simultaneous or “combo” (buy put + sell call) order to avoid interim exposure.
7. Monitor and manage
• Watch for early assignment risk on the short call (especially around dividends) and for large moves that may require rolling strikes or closing legs.
8. Exit or roll as needed
• At or before expiration, decide whether to let options exercise/expire, close legs, or roll to a new collar.
Example 1 — Illustrative Zero Cost Collar (net premium = $0)
– Situation: You own 100 shares bought at $100; current market price = $120.
– Objective: Lock in most gains for 1 month while allowing modest additional upside.
– Trade:
• Buy 1-month put, strike $115, premium = $0.95 per share → cost = $95
• Sell 1-month call, strike $124, premium = $0.95 per share → credit = $95
• Net premium = $0 (ignoring commissions)
– Outcomes at expiration:
• If stock ≤ $115: put exercised; you sell stock at $115 → realized sale price = $115 (protects from deeper falls).
• If stock between $115 and $124: both options expire worthless; you keep stock valued at market price (between strikes) and your effective locked‑in gain remains intact relative to the lower bound.
• If stock ≥ $124: call exercised; you must sell at $124 → your upside is capped at $124.
– Net effect: You’ve guaranteed that, over the life of the options, your sale price will be between $115 and $124 (or unchanged if you do not close position), while having paid no net premium for that band.
Example 2 — Collar with Net Credit (small income)
– Same starting position (own 100 shares at $100; current = $120), but choose:
• Buy put strike $114, premium = $0.60 → cost = $60
• Sell call strike $124, premium = $0.75 → credit = $75
• Net credit = $15
– Outcomes:
• Downside protected to $114, upside capped at $124, plus you receive $15 cash today (before commissions). The $15 increases your effective sale proceeds (or reduces net basis).
Mathematical Payoff and P/L at Expiration (for owner who bought shares at P0)
– Let S0 = current stock price when you set collar, P0 = your original purchase price, Kput = put strike, Kcall = call strike, PremiumPut = cost, PremiumCall = credit.
– Net premium = PremiumPut − PremiumCall (positive = net debit).
– If S_T ≤ Kput: stock effectively sold at Kput → total proceeds = Kput − P0 − Net premium (ignoring fees).
– If Kput < S_T < Kcall: you keep stock at S_T → unrealized P/L = S_T − P0 − Net premium.
– If S_T ≥ Kcall: stock is sold at Kcall → total proceeds = Kcall − P0 − Net premium.
– Maximum loss (relative to P0) occurs at S_T = 0: limited by the put strike (you don’t lose more than P0 − Kput, adjusted for net premium).
– Maximum gain is capped at Kcall − P0 − Net premium.
Is a “Zero Cost” Collar Really Costless?
– Transaction costs: Commissions, exchange fees, and bid/ask spreads can make a supposed zero net premium trade effectively a net debit (or reduce a net credit).
– Early assignment risk: If you’re short the call, early exercise (e.g., ex‑dividend) can force stock sale earlier than expected.
– Opportunity cost: If the underlying rallies well above the short call strike, your upside is capped—this is a real cost in lost further gains.
– Margin and capital: Some brokers require margin or adjustments to account for short option obligations. There may be margin interest or collateral requirements.
– Liquidity and price slippage: Option markets may be less liquid at certain strikes/expirations; you may have to accept worse fills than theoretical midpoint quotes.
In short, “zero cost” refers only to option premium parity, not to total economic cost.
Tax, Accounting, and Corporate Action Considerations
– Tax treatment varies by jurisdiction. Selling the call that is subsequently exercised generally creates a sale of stock at the strike price, impacting capital gains calculations (short‑term vs. long‑term). Premiums received/paid may have special tax treatment in some cases.
– Dividends: If the stock pays a dividend, the short call holder may be assigned early just before the ex‑dividend date to capture the dividend, forcing you to sell the shares earlier than the call’s expiration.
– Record keeping: Keep clear records of dates, premiums, and assignments—tax rules for options can be complex.
When to Use a Zero Cost Collar
– Locking in gains after a large run-up when you want protection but aren’t ready to sell.
– Hedging against a near-term event (earnings, FDA decision, macro news).
– Generating limited income while keeping some upside (if you set strikes accordingly).
– Reducing volatility in a concentrated equity position without liquidating the holding.
When Not to Use a Collar
– If you strongly believe in major upside appreciation and don’t want to cap gains.
– When options are very expensive (high implied volatility) making protection costly.
– If you need full liquidity and wish to avoid the risk of short‑call assignment.
Common Mistakes and How to Avoid Them
– Entering legs separately and exposing yourself to directional risk between fills — use combination orders if possible.
– Neglecting early assignment risk around dividends — monitor ex‑dividend dates and consider closing the short call before that date if assignment is a concern.
– Overlooking commissions and spreads — calculate net economic cost including these.
– Choosing strikes incompatible with your goals — be explicit about the trade‑off between protection and capped upside.
Alternatives and Complements
– Protective put only: Full downside protection (to the put strike) without a capped upside, but costs money.
– Covered call only: Generates income but provides no downside protection.
– Stop orders: Simpler but may not execute at favorable prices during volatility.
– Put spreads and collars with additional legs (fences) for customized payoff shapes.
Example Case Study — Practical Walkthrough
– You own 200 shares of Company X, cost basis $50, current price $80. You want one quarter (3‑month) protection, willing to cap upside at $90.
– Step 1: Decide per 100‑share contract; you’ll need 2 contracts.
– Step 2: Shop option chain for 3‑month put 75 and call 90.
• Suppose put 75 = $1.60, call 90 = $1.60 → net premium ≈ $0.
– Step 3: Enter a 2‑contract simultaneous order: buy 2 puts 75, sell 2 calls 90.
– Outcome: For 3 months your position is protected below $75; upside capped at $90. If the stock falls to $60, you effectively can exit at $75 thanks to the put. If it rises to $100, you’ll be sold at $90 and realize gains to that level.
Final Thoughts and Quick Checklist
– A zero cost collar is a practical, widely used way to protect stock positions by buying an out‑of‑the‑money put while selling an out‑of‑the‑money call with the same expiration.
– It trades unlimited upside for defined downside protection in a chosen price band.
– Realize that “zero cost” typically refers to option premiums only; account for commissions, assignment risk, taxes, and opportunity cost.
– Use combination orders, pick liquid strikes and expirations, and continually monitor for corporate actions and market moves.
Quick Execution Checklist
– Confirm shares owned and number of contracts (100 shares per contract).
– Check option liquidity (open interest, bid/ask spreads).
– Select expiration aligned with your objectives.
– Choose put and call strikes to match your risk/reward tolerance.
– Enter simultaneous combo order if possible.
– Monitor for assignment risk, dividends, and changes in implied volatility.
– Decide on exit strategy: let expire, close legs, or roll.
Sources and Further Reading
– Investopedia — “Zero Cost Collar”
– Chicago Board Options Exchange (CBOE) — Options education and strategy descriptions
– Options Industry Council (OIC) — educational materials on collars and option spreads
Concluding Summary
A zero cost collar is a flexible hedging tool that helps investors lock in gains while limiting downside risk by combining a protective put and a covered call with offsetting premiums. It is particularly useful for holders of appreciated stock who want to avoid selling but desire near‑term protection. While it can be implemented with little or no net option premium, investors must account for commissions, liquidity, early assignment risk, and the opportunity cost of capping upside. With careful selection of strikes and expirations, and by using simultaneous executions, the collar can be an effective part of a disciplined risk‑management approach.