A protective put and a collar buy a floor and charge for it

strategyPublished 20 October 20262 min readequities

Key points

• The floor is only as good as the strike, the expiry and the fill.
• Funding the put by selling a call adds a cap.
• A debit spread and a credit spread cap the gain and the loss in different directions. Neither is automatically limited in every account if the contract is not the one you think.

What is going on

A long put rises in value, at expiry, as the share falls below the strike, which can offset the share loss below that level after the premium is counted. Above the strike the put expires and the premium is spent. A collar adds a short call. The net premium can be smaller, or even a credit, because the call was sold. The share gain then stops at the call strike. A vertical debit spread pays a net premium for a capped payoff. A credit spread takes a net premium and owes a capped loss if the spread finishes in the money. Undefined-risk structures, such as a short call with no shares behind it, are a different contract from a covered call.

Why it matters

The cost of the hedge is the premium, the spread, and the upside you sold if you sold it. A hedge that expires before the loss arrives has not hedged that later loss. Implied volatility changes what you pay for the put before expiry. The expiry drawing does not include that. Assignment on the short call can remove the shares earlier than the expiry date you wrote down.

What to watch

Match expiries and contract size to the shares. Write the net premium after the spread. Decide in advance whether you will roll, close, or hold to expiry. If you cannot describe the loss at the worst expiry finish, you do not have the structure.

Risks

A floor at one strike is not a floor at a better price. Gaps, early exercise and a missed roll leave the shares exposed. This page does not quote a premium or a probability.