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Zero-cost collar explained, and what the cap really costs

A zero-cost collar puts a floor under shares you own by buying a put, then pays for that put by selling a call above the price. Nothing leaves your account on day one. The cost shows up later, at the top.

Options guide · 9-minute read · Updated 2026-10-29

What a zero-cost collar is

Three pieces, on a stock you already own:

1. 100 shares. You keep them.
2. A Protective put below the price. You buy it. That is your floor — the price you can always sell at.
3. A Covered call above the price. You sell it. The premium pays for the put.

Pick the two strikes so the premium you collect on the call matches the premium you pay for the put, and the whole structure costs nothing out of pocket. That is where "zero cost" comes from.

A plain Collar is the same thing with a bill attached. The zero-cost version is just the collar tuned until that bill reads nothing.

It is the main tool for a problem the rest of the strategies on the options strategies beyond the wheel map cannot touch: you own something that has run up, you do not want to sell it, and you cannot afford to watch it halve.

The zero cost is paid in upside

The put is not a gift. Somebody wrote it and wants paying. You paid them with the call.

What the call sold is your rally. Above that strike the shares get called away, and every dollar above it belongs to whoever bought the call.

So the honest name for this trade is not "free protection". It is swapping your upside for a floor. Whether that is a good swap depends entirely on how far away the ceiling is, and the table below puts a number on it.

A worked example (an illustration, not a trade idea)

Cedar Ridge Utilities, a made-up company. You bought 100 shares at $40. It has run to $50 and you are nervous.

With 90 days to expiry:

• Buy the $45 put for $1.25 → pay $125
• Sell the $55 call for $1.25 → collect $125
• Net cost: $0

Your floor is $45. Your ceiling is $55. The matching premiums keep the arithmetic clean here; the section further down explains what a real options chain usually does to that symmetry.

Every outcome at expiry

Measured from $50, the price on the day you put the collar on, so you can see what the collar did and what it cost.

Below $45 the put takes over: you sell at $45 whatever the screen says, so the loss stops at $500 and the collar has saved you up to $1,500 at the bottom row.

Above $55 the call takes over: you sell at $55 whatever the screen says. At $65 that cost you $1,000 of gain you would otherwise have had. At $75 it cost you $2,000.

Those two numbers in the last column are not a footnote. They are the price of the trade, and they are far larger than the $125 the put would have cost you if you had simply bought it with cash.

Because your Cost basis is $40, add $1,000 to every number in the collar column to see your result on the whole position: the worst row becomes a $500 gain and the best becomes a $1,500 gain. The floor only looks comfortable because you bought at $40. Collar a position that is already underwater and the floor is a locked-in loss.

Why the strikes are rarely as neat as that

In the real world, a put $5 below the price almost always costs more than a call $5 above it. The reason is Volatility skew: markets fall faster than they rise, so downside protection is bid up and the options chain charges more for it.

What that means in practice: to fund the put you usually have to bring the call closer to the price than the put. The floor sits $5 below, the ceiling ends up $3 or $4 above. The trade is less symmetrical than every diagram of it suggests.

Three dials, all pulling the same way:

There is no setting where you get a high floor, a distant ceiling and no cost. That option is not on the menu.

What can go wrong before expiry

• Early assignment on the call. If the stock runs well past $55 and a dividend is coming, your short call can be exercised early, usually just before the Ex-dividend date. Your shares go at $55 sooner than planned, and you are left holding a lone long put — a bearish bet you never meant to make. Close or roll the put the same day.
• The put expires and the stock keeps falling. A collar is protection with an end date. The floor exists until expiry and not one day longer. Our covered call guide makes the same point from the other side.
• Rolling turns free into expensive. Pushing the ceiling up to keep a rally alive means buying back a call that has gained value. That costs real money and it has to come from somewhere, usually from lowering your floor.
• Shares leaving through either leg is a sale. In a taxable account that is a disposal with tax consequences, which is worth settling with a tax professional before you pick the strikes, not after.

When a collar earns its keep

It fits a narrow set of situations, and it fits them well:

• A single position that has grown into too much of your account and that you cannot sell yet, for tax reasons or a lock-up.
• Shares you need to still be worth something on a known date — a down payment, a tuition bill.
• A nervous stretch you want to sit out while staying invested.

It fits badly when you still expect a big move up — you have just sold that move — or when you could simply trim the position instead.

Compared with the wheel strategy, a collar is the defensive twin: the wheel sells calls to get paid, a collar sells calls to buy insurance.

Access: owning shares and selling a call against them is permitted in most TFSAs and RRSPs, but buying the put sits at a higher Options approval level at many brokers and some will not accept a two-legged collar order in a registered account at all — check your broker's current options agreement first.

Price your own version in the collar calculator with your real cost basis. Then look at what a strong rally would have cost you. That is the figure to make peace with before you place the order.

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