How do you construct a zero-cost collar, and what trade-offs does the 'free' hedge involve?

A zero-cost collar protects a long stock position by buying a protective put and funding it by selling a covered call, with strikes chosen so the call premium received equals the put premium paid. The cost is zero in cash terms, but you sacrifice upside potential above the call strike.\n\nConstruction:\n\n1. Own 100 shares of the underlying stock\n2. Buy 1 OTM put (downside protection)\n3. Sell 1 OTM call (funds the put, caps upside)\n4. Adjust strikes until: Call premium = Put premium\n\n`mermaid\ngraph TD\n A[\"Stock Position
Own 100 shares at $85\"] --> B[\"Buy Put at $75
Premium: $2.40\"]\n A --> C[\"Sell Call at $95
Premium: $2.40\"]\n B --> D[\"Downside protected
below $75\"]\n C --> E[\"Upside capped
above $95\"]\n D --> F[\"Net premium cost:
$2.40 - $2.40 = $0\"]\n E --> F\n F --> G[\"Zero-Cost Collar
Profit range: $75 to $95\"]\n`\n\nWorked Example:\n\nTrader Naomi owns 500 shares of Riverstone Logistics at $85 per share. She wants downside protection before earnings. 45-day options are available:\n\n| Put Strike | Put Premium | Call Strike | Call Premium | Net Cost |\n|---|---|---|---|---|\n| $80 | $1.90 | $92 | $1.90 | $0.00 |\n| $75 | $1.15 | $98 | $1.15 | $0.00 |\n| $70 | $0.60 | $105 | $0.60 | $0.00 |\n\nNaomi selects the $80/$92 collar because it provides meaningful downside protection while retaining 8.2% upside potential.\n\nPayoff at Expiration (per share):\n\n| Stock Price | Stock P&L | Put P&L | Call P&L | Total P&L |\n|---|---|---|---|---|\n| $65 | -$20.00 | +$15.00 | $0 | -$5.00 |\n| $75 | -$10.00 | +$5.00 | $0 | -$5.00 |\n| $80 | -$5.00 | $0 | $0 | -$5.00 |\n| $85 | $0 | $0 | $0 | $0 |\n| $90 | +$5.00 | $0 | $0 | +$5.00 |\n| $92 | +$7.00 | $0 | $0 | +$7.00 |\n| $100 | +$15.00 | $0 | -$8.00 | +$7.00 |\n\nMaximum gain: $7.00 (stock price to call strike: $92 - $85)\nMaximum loss: $5.00 (stock price to put strike: $85 - $80)\n\nThe Trade-Off:\n\nThe collar is not truly \"free\" — you pay with opportunity cost. If Riverstone jumps to $110, Naomi captures only $7 of the $25 move. The forgone upside is the real cost of the hedge.\n\nFinding the Zero-Cost Balance:\n- Start with your desired put protection level\n- Solve for the call strike where the premium matches\n- Higher volatility skew (puts more expensive than calls) pushes the call strike closer to ATM\n- Longer time to expiration typically widens the collar (put and call strikes further apart)\n\nCorporate Use:\nExecutives with concentrated stock positions frequently use zero-cost collars to hedge without cash outlay, especially during lockup periods when they cannot sell shares.\n\nPractice collar strategies in our CFA Derivatives modules.