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Collar Strategy: Buying a Floor by Selling an Upside Cap

For educational purposes only; not investment advice.

Direct answer

Section titled “Direct answer”

A collar combines a long stock position with a long protective put and a short covered call, normally using matching share quantities and the same option expiration. The put establishes a downside sale price, while the call premium helps pay for the protection in exchange for giving up gains above the call strike.

The strategy does not remove market risk. It converts an open-ended stock payoff into a range for the selected term: a lower floor, ordinary stock exposure between strikes, and an upper cap. The protection ends or changes when the options expire, are closed, exercised, assigned, or rolled.

Expiration payoff

Section titled “Expiration payoff”

Let S₀ be stock value when the collar is evaluated, K_P the put strike, K_C the call strike, and N the net option cost per share (put premium − call premium). Ignoring dividends, fees, tax, and prior stock gains or losses, expiration P/L per share is:

Π(S_T) = (S_T−S₀) + max(K_P−S_T,0) − max(S_T−K_C,0) − N

For K_P < K_C:

  • S_T ≤ K_P: P/L is fixed at K_P−S₀−N.
  • K_P < S_T < K_C: P/L follows the stock as S_T−S₀−N.
  • S_T ≥ K_C: P/L is capped at K_C−S₀−N.

If the collar opens for a net credit, N is negative. A “zero-cost collar” means quoted put and call premiums approximately offset at entry; it does not mean zero risk, zero spread, or zero opportunity cost.

Stock dividends add economic return if received, but a short American call may be assigned before an ex-dividend date. Borrow, voting rights, taxes, and corporate actions can also alter the practical outcome.

A 90/110 collar on stock at 100

Section titled “A 90/110 collar on stock at 100”

Hold 100 shares valued at 100 each. Buy one 90 put for 2.00 and sell one 110 call for 1.50, both with the same expiration. Net option cost is 0.50 per share, or 50 dollars.

  • At or below 90, expiration loss is limited to 90−100−0.50 = −10.50 per share, or −1,050 dollars.
  • Between 90 and 110, P/L follows S_T−100.50, so the simple breakeven is 100.50.
  • At or above 110, maximum expiration gain is 110−100−0.50 = 9.50 per share, or 950 dollars.

These amounts exclude dividends, commissions, taxes, and any difference between the stock’s tax basis and the 100 reference value. A pre-existing unrealized gain or loss does not disappear when the collar is added.

Construction and management checklist

Section titled “Construction and management checklist”
  • Match the put and call contract multiplier and quantities to the actual shares; adjusted options may not represent 100 ordinary shares.
  • Choose the put strike from the maximum acceptable stock loss, then evaluate how much upside must be surrendered to fund it.
  • Compare synchronized executable package quotes, not separate last-sale prices or an assumed zero cost.
  • Check earnings, dividends, mergers, distributions, voting needs, stock-loan terms, and any holding-period or tax implications with qualified advice.
  • Monitor short-call early assignment, particularly before ex-dividend dates when remaining extrinsic value is less than the dividend incentive.
  • Plan what happens at each strike: sell stock through call assignment, exercise or sell the put, close the package, or roll to a new term.
  • Do not wait until after expiration to discover broker exercise cutoffs, share requirements, or after-hours pin risk.
  • Record old and new option results separately when rolling; a new credit does not erase protection cost or prior stock loss.

Common misconceptions

Section titled “Common misconceptions”
  • “A collar guarantees no loss.” Loss remains between the stock reference and put floor, plus net cost and frictions.
  • “Zero-cost means free insurance.” The short call gives away upside and can be assigned early.
  • “The covered call cannot create problems.” Assignment can sell shares earlier than intended and affect dividends or taxes.
  • “The put automatically closes the stock.” Exercise and broker procedures require explicit handling.
  • “A wider collar is always better.” A lower put weakens protection; a higher call may fund less premium.
  • “Rolling extends the same trade.” It closes old options and establishes a new protection range with new costs and events.
Section titled “Related topics”

Authoritative sources

Section titled “Authoritative sources”