What is a Bull Put Spread? A Guide to Selling Puts Safely

A bull put spread means selling a put and buying a lower-strike put on the same underlying and expiry. You collect a credit upfront and keep it if the price holds above the sold strike. The lower put you own is what stops a sharp fall from becoming an unlimited loss.

Selling puts is a well-known way to earn premium, and also a well-known way to get hurt when a market drops. Adding a cheaper long put underneath turns it into a controlled position.

The sections below cover what you earn, what the protection costs, and what happens if the price closes between the strikes.

Key Takeaways

• A credit is collected when the trade is opened.
• The credit is kept if the price stays above the sold strike.
• A lower long put converts unlimited risk into a fixed amount.
• It expresses a mildly bullish or neutral view.
• Assignment is a real possibility near expiry.

How the position is built

You sell a put near the current level to collect premium, then spend part of that premium on a put at a lower strike. What remains is your credit. The structure says, in effect, that you are willing to be paid for the market holding a floor, provided somebody else carries the risk of a crash.

Consider NIFTY trading at 22,600. You sell the 22,600 put at ₹180 and buy the 22,400 put at ₹90, collecting a net credit of ₹90. If NIFTY finishes at or above 22,600, both puts expire worthless and you keep that ₹90 as your maximum profit. The maximum loss is the 200-point strike gap minus the credit, which is ₹110. Breakeven is 22,510.

What the long put is really for

A naked short put on an index carries risk that grows all the way down to zero. The 22,400 put ends that. Below it, the long put gains point for point with the short put, so the account stops bleeding. That single leg is the difference between a defined trade and a position that can damage an account in one gap-down.

The zone between the strikes

Finishing between 22,400 and 22,600 is the outcome traders often overlook. The short put is in the money and the long put is not, so the result lands somewhere between the maximum profit and the maximum loss. At 22,510 the loss on the short put exactly equals the credit and the trade breaks even.

Assignment and expiry week

If the short put moves into the money as expiry nears, assignment becomes a live possibility, particularly for stock options where physical settlement applies. Many traders close the spread rather than carry it into the final session. Exchange rules on settlement are revised from time to time, so check the current position before letting a spread run to expiry.

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Futures and Options are leveraged products and carry a high risk of loss that can be more than the money you put in. This article is only for learning and is not a recommendation to trade in derivatives.

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