Collar — a hard floor bought with a hard ceiling

What is a collar?

A collar holds 100 shares, buys a protective put below the market and sells a call above it. The sold call pays for the put. The result is a corridor: a hard floor under the loss and a hard ceiling over the gain, both known at entry.

Key takeaways

• A collar bounds loss and gain at once — both limits are fixed at entry.
• The sold call pays for the protective put; the currency is upside.
• "Zero cost" describes the cash outlay, not the cost.
• The capital requirement is very high, because the stock position is part of it.

The question to answer before you open the trade: Will you accept a hard ceiling in exchange for a hard floor?

A simple mental model: a price corridor for the harvest

Imagine you grow apples. A crate fetches 100 € today. Because you have no idea where the price will be in autumn, you strike a deal with the cider mill: they pay you at least 90 € a crate, however far the market falls. In return you receive at most 110 €, however far it rises. No money changes hands when you sign.

Three things follow, and together they are the whole collar:

• Between 90 € and 110 € nothing changes. You simply get the market price.
• If the price collapses to 40 € you still get 90 €. But the 10 € slide from 100 € to 90 € is yours to carry.
• If the price runs to 130 € you still get 110 €. The 20 € above that belongs to the mill — that is what the floor cost you.

Where the picture ends: the corridor is a deal made of two halves that can be unwound separately — and unwinding only one half leaves you in a completely different position. The two halves are also rarely worth the same in the market: downside protection usually costs more than the equivalent slice of upside.

How does a collar work?

The driver is direction on the stock you own — but only inside a corridor. You hold 100 shares. Beneath them you place a bought put as a floor, above them a sold call as a ceiling. The put costs premium, the call brings premium, and in the usual construction the two largely cancel.

What this produces is not a return strategy but a reshaping of the risk profile. Before, you held stock with an open loss below and an open gain above. Afterwards, both are bounded. Whether that is a good exchange depends entirely on which of the two open ends occupies you more.

Movement works against you in both directions. Below the put strike the protection engages, but the loss down to that point is still yours. Above the call strike, that part of the gain belongs to somebody else.

If you remember one thing: you do not pay for your floor with money, you pay for it with your ceiling.

How is a collar constructed?

1. +100 shares
2. +1 Put @Kp
3. -1 Call @Kc

The stock position is the core; the two options reshape it. The put sits below the market and the call above it, both typically at 0.20–0.30 delta. That symmetry is why the premiums roughly cancel.

One detail interferes in practice: at equal distance, puts usually cost more than calls, because volatility skew prices downside protection higher. A perfectly equidistant collar is therefore rarely genuinely cost-neutral — either a small debit remains, or the call moves closer to the market and the ceiling comes down.

Worked example

You own 100 shares at 100 €. You buy the 90 € put for 2 € and sell the 110 € call for 2 €. The premiums cancel — a zero-cost collar.

Maximum profit: 10 € per share, or 1,000 € — the distance from the share price to the call strike, adjusted by the net premium. You reach it whenever the stock finishes at or above 110 €. At 130 € the gain is the same as at 110 €.

Maximum loss: 10 € per share, or 1,000 € — the distance from the share price to the put strike, adjusted the same way. You reach it whenever the stock finishes at or below 90 €. A fall to 40 € still costs 1,000 €. That is the entire point of the construction.

Break-even: 100 € — the entry price, because the net premium is zero.

Now the version with skew in it. More realistically, the 90 put costs 2.50 € and the 110 call brings 1.50 €: a net debit of 1 €. Everything then shifts by exactly that euro — maximum profit 9 € (900 €), maximum loss 11 € (1,100 €), break-even 101 €. The corridor stays the same width; it simply sits less favourably. Anyone reading "zero cost" in an offer should recompute that number.

• Run your own numbers: Break Even Multi Leg Calculator →

When is a collar worth it?

Market phases it suits

• Sideways
• Breakout, direction unknown
• Strong downtrend

Goal

• Hedging
• Income

A collar belongs on a stock position you want to keep, but not unprotected: ahead of an unclear breakout, in a sideways market with downside risk, or when a large unrealised gain should not be allowed to evaporate.

On volatility it tolerates medium to high implied volatility — the swing the market expects in future, which makes every option more expensive. Unlike a plain protective put, high implied volatility is not a problem here: you buy expensively, but you also sell expensively. What matters is not the level but the skew between the two sides.

Its purposes are hedging and income — though income plays a supporting role at best. The call is not a revenue source, it is the means of payment for the put. Treating a collar as an income strategy leads to a call strike placed too close, which damages the very position it was meant to protect.

The greeks on a collar

Short version: positive delta, everything else near zero. A collar is still a stock position — one with the ends trimmed off. The near-neutral vega follows from the bought put and the sold call responding to volatility in opposite directions and largely cancelling.

Management

A collar has no profit target, and that is not an omission in the data — it follows from how the position is built. The ceiling is the profit target; it is fixed at entry and no amount of management improves it. Likewise, the loss limit is not a rule you follow but the put strike, which engages regardless.

That leaves one thing to manage: rolling both legs together. They belong together. Buying back the call because the stock rallied and leaving the put in place means holding a protective put from that moment — with a running cost that was not there before. Letting the put expire because "nothing is happening" means holding a covered call and carrying the full downside again.

The typical 60–180 day expiration is longer than on most strategies here. A collar is a holding construction, not a trading position.

Assignment and capital

Assignment risk

medium on the short call

Capital required

very high (a full stock position)

Typical expiration

60-180

Typical delta

Put 0.20-0.30, Call 0.20-0.30

The assignment risk is medium and sits on the short call. Early exercise means delivering the shares at the call strike — not painful, since you own them, but the position ends early and the bought put is left standing without stock behind it. The probability rises before an ex-dividend date, especially once the call holds little extrinsic value.

The capital requirement is very high: it includes the whole stock position. At 100 shares of a 100 € stock that is 10,000 €, and the two options change nothing about it. A collar is not a capital-efficient strategy — it is a rebuild of a position you are holding anyway.

What a collar does not mean

• "Zero cost" does not mean free. Only the cash outlay at entry is zero. You pay in gains above the ceiling — 20 € per share in the example if the stock reaches 130 €.
• Hedged does not mean loss-free. The stretch from your entry price down to the put strike is entirely yours: 1,000 € per contract in the worked example, before the floor carries anything.
• Equal distances do not make a symmetric corridor. Downside protection is usually priced higher than the same slice of upside, so a 10-below, 10-above collar normally still leaves a small debit.
• A collar is not an income strategy. The call premium is the means of payment for the put, not your return. Booking it as income leads to a ceiling placed too close.
• Reaching the ceiling does not mean the trade went perfectly. It only means the stock rose further than your corridor allows, and that part of the move never reached you.

Which mistakes cost money on a collar?

Read "zero cost" as free. The premiums cancel; the cost does not. You pay in upside above the call strike, and that price only becomes visible once the stock has risen. Work out before entry what a 30 % rally costs you inside this collar.

Call strike placed too close. The most common construction error. A tight call funds the put comfortably and caps the position so early that it can never recover from a dip. Over several cycles a pattern emerges: the declines taken in full, the recoveries only as far as the ceiling.

Treated the two legs separately. The put and the call are one unit. Rolling, closing or expiring only one of them means holding a different strategy with a different risk profile from that moment — usually without noticing.

Left running permanently. A collar caps the gain. Rolled for years, it systematically cuts off the best advances while braking declines only as far as the put strike. As protection through a specific phase it is a tool; as a permanent state it is a decision against the position's own return.

Feynman check: explain a collar without jargon

Explain to someone in three sentences what you are actually doing. Do it without the words "put", "call", "strike" and "premium".

Your explanation is complete when it contains four things:

1. What do you own before the trade starts?
2. Where is your floor — and who guarantees it?
3. What did you pay for that floor?
4. How much loss do you carry before the floor engages at all?

One possible explanation: "I own 100 shares. I bought the right to hand them over at a fixed price below today's, up to a set date — that is my floor. I did not pay for it with money but with a second commitment: I have to hand the shares over at a fixed price above today's if someone asks. Between those two prices I am simply invested in the stock as usual."

If your explanation says the collar was free, or that you can no longer lose anything, those are the two classic gaps. Go back to the worked example: 1,000 € of loss down to the floor is possible, and a rally to 130 € costs you 20 € per share in gains you never see.

Five questions before you enter

1. What does this corridor cost me if the stock rallies 30 %?
2. How much loss down to the floor am I willing to carry?
3. After both premiums, is the net really zero — or is there a debit?
4. How long do I want the protection to last, and will I roll both legs together?
5. Does an ex-dividend date fall inside the life of the call I am selling?

Collar or Protective Put: what is the difference?

This data-driven table lays out the differences that actually matter between Collar and Protective Put.

Collar compared with Protective Put

Criterion	Collar	Protective Put
Market phase	Range-bound, no trend, price oscillating between levels, Big move expected, direction unknown (event, coiling at the edge of a range) or Clear downtrend or an outright crash	Clear uptrend, expected to continue, Big move expected, direction unknown (event, coiling at the edge of a range) or Clear downtrend or an outright crash
What pays you	Direction	Direction
Risk defined	Yes	Yes
Max profit	(the call strike minus your cost basis) plus (the credit received minus the debit paid)	unlimited
Max loss	(your cost basis minus the put strike) minus (the credit received minus the debit paid)	(your cost basis minus the put strike) plus the debit paid
Capital required	very high (a full stock position)	very high (stock position plus premium)
Approval level	1	1

In short: Collar fits when the market phase is Range-bound, no trend, price oscillating between levels, Big move expected, direction unknown (event, coiling at the edge of a range) or Clear downtrend or an outright crash and the goal is Hedging or Income; Protective Put fits when the market phase is Clear uptrend, expected to continue, Big move expected, direction unknown (event, coiling at the edge of a range) or Clear downtrend or an outright crash and the goal is Hedging.

Related strategies

These strategies solve a similar problem — the counter position is the inverse.

Protective Put→

Bullish with downside protection · Single leg

What does this insurance cost you per year, as a percentage of the position?

Covered Call→

Neutral to mildly bullish · Single leg

Are you willing to hand over the shares at the call strike - even if they keep running afterwards?

Counter position: Long Straddle→

Direction-neutral, needs a big move · Movement

Does the move have to be bigger than the one the market has already priced in?

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