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How Does a Costless Collar Actually Cap the Risk on a Pile of One Stock?
You buy a put to set a floor and sell a call to pay for that put. If the premiums are close to equal, little or no cash leaves the account on day one. The stock can still fall, but only to the put strike. It can still rise, but only to the call strike. Outside that band, the options take over.
Mechanics are simple. You already own the shares. You pick an expiration, often three to twelve months. You buy a put below the market — say 10% to 15% down. That is insurance. You sell a call above the market — often a similar percentage up. The call premium funds the put. “Costless” is a nickname, not a promise. Spreads, early assignment, and a second collar when this one expires all cost something. If the stock finishes between the strikes, both options expire and you still own the shares. If it drops through the put, you can sell at the floor. If it rips through the call, the shares can be called away at the ceiling. That sale is a real taxable event.
A deep-in-the-money put can be treated as a constructive sale. A typical out-of-the-money collar usually is not, but it can pause the holding period on the stock under the straddle rules while the options are on. That matters if you were six months from long-term and wanted the 15% rate.
The couple is 43 and 41. A 15-year-old and a 6-year-old daughter. Combined W-2 income is $462,000 this year, including a chunk of vested stock from his employer. Texas. House worth $580,000 with $390,000 left on the mortgage. Combined 401(k)s are $540,000. Taxable brokerage is $485,000, and $410,000 of that is one ticker — employer shares from RSUs he never sold. Cost basis on most lots is much lower. Term life is in force. College for the 15-year-old is three years out and the 529 is light.
The stock trades near $92. They collar 2,000 shares (about $184,000) with a six-month $80 put and a $108 call. Premiums net to almost zero after the spread. Floor is $160,000 on that block. Ceiling is $216,000 plus the tiny net credit. If the stock goes to $70, the put covers down to $80. They lose about $24,000 on that slice instead of $44,000. If it goes to $125, the call takes the shares at $108. They realize the gain up to $108 in 2027, miss the last $17, and still have the other 2,400 shares uncapped.
Compare that with selling 2,000 shares today at $92. That books a large long-term gain in a year when MAGI is already over the $250,000 NIIT line. Federal tax on that gain sits at 15% plus 3.8%, and it is cash they cannot put back without a wash-sale problem if they repurchase too fast. The collar defers the tax and keeps the dividend for now. It also caps the upside they were counting on for the 529 gap.
This does not fit if a trading window or an insider policy blocks them from delivering shares when the call is exercised. It does not fit if they need unlimited upside to hit a number in two years. The common mistake is collaring the whole position, then watching the stock double while they sit at the call strike, or letting the collar expire and forgetting to roll so the floor disappears the week before a bad print.
Check lot-level basis, holding period, and whether the shares are free to sell. Read the option approval level at the broker. Price a few expirations; six months is not magic. If the call premium will not pay for a put that actually protects you, the collar is not costless. It is just a short call with a weak put attached.
Numbers here are illustrative, not a recommendation for a specific household.
Hypothetical example for general educational purposes only. The household described is not an actual client, and the numbers are illustrative; results are not representative of any client's experience. This is not personalized advice or a recommendation. Options involve risk, including possible loss of principal and early assignment; read the OCC's Characteristics and Risks of Standardized Options.
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