Bull Put Spread: Getting Paid for a Mildly Bullish View With Capped Risk

Sometimes our view on a stock or index is only mildly positive. We don’t expect a rally, we just don’t think it will fall much before expiry. Buying a call for that view feels wasteful, because time decay eats the premium while the price drifts. A bull put spread flips the arrangement around: you collect a premium upfront and keep it if the price simply stays above a level you chose, with a hard cap on how much you can lose if you are wrong.

This guide covers how the trade is built, the three numbers that define it (maximum profit, maximum loss and breakeven), a worked rupee example at expiry, how strike choice changes the risk, and the assignment and expiry risks that beginners tend to ignore. The definitions and formulas follow the strategy pages published by the Options Industry Council (OIC) and tastylive.

What a bull put spread actually is

The structure has two legs, both puts, on the same underlying and with the same expiry:

• Sell one put at a higher strike, closer to the current price.
• Buy one put at a lower strike, further away.

The put you sell is worth more than the put you buy, because it sits nearer the money. So the trade opens with money coming into your account. That is why it is also called a credit put spread, or a short put vertical. OIC describes it simply: a limited-risk, limited-reward strategy made of a short put and a long put with a lower strike.

The short put is where the income comes from. The long put is the insurance. OIC puts its job plainly: it offsets assignment risk and protects you if the stock drops sharply. Without that lower put, you would just be a naked put seller, with losses that keep growing all the way down.

tastylive groups it as one of the four vertical spreads, alongside the bull call spread, the bear put spread and the bear call spread. A vertical spread, in their definition, means buying and selling options of the same type, on the same underlying and expiry, at different strikes.

The three numbers that define a bull put spread

Everything about this trade is known before you place it. That is its biggest attraction. Both OIC and tastylive give the same three formulas:

• Maximum profit = net credit received. You get this if the price is above the higher (short) strike at expiry. Both puts expire worthless and you keep the whole credit.
• Maximum loss = (higher strike minus lower strike) minus net credit. This happens if the price is below the lower (long) strike at expiry.
• Breakeven = short put strike minus net credit.

Between the two strikes, the result slides from full profit to full loss. OIC notes that profits start to erode once the stock is below the short put strike, and losses hit their maximum at or below the long put strike. Below that, any extra loss on the short put is matched by gains on the long put, so the damage stops growing.

The credit you collect is the most you can ever make on this trade. Everything after the entry is about how much of it you get to keep.

A worked rupee example

Let’s put numbers on it. Everything below is hypothetical, picked only to make the arithmetic clear.

Stock A trades at ₹1,000. You think it will hold up over the next few weeks but you are not expecting a breakout. You set up a bull put spread for the same expiry:

• Sell the 980 put at ₹22
• Buy the 940 put at ₹8

Net credit = 22 minus 8 = ₹14 per share. The gap between strikes (the width) is 980 minus 940 = ₹40.

• Maximum profit = ₹14 per share
• Maximum loss = 40 minus 14 = ₹26 per share
• Breakeven = 980 minus 14 = ₹966

Assume, purely for the example, that one contract covers 500 shares. Then the maximum profit is 14 × 500 = ₹7,000 and the maximum loss is 26 × 500 = ₹13,000. Real lot sizes differ by contract, so always multiply by the lot size in the exchange’s current contract specifications rather than our made-up 500.

What happens at expiry

Look at the last two rows. Whether Stock A ends at ₹940 or crashes to ₹900, the loss is the same ₹13,000. The 940 put does its job. The P&L per share is simply the credit of 14 minus the 980 put’s value plus the 940 put’s value.

Notice also what the trade doesn’t need. Stock A can fall 2% from ₹1,000 to ₹980 and you still keep the full ₹14. That is the appeal for a mildly bullish or sideways view: you are paid for the stock not falling much, rather than for it rising.

The catch: risk is bigger than reward

In our example you risk ₹26 to make ₹14. Put another way, the credit is 14 of the 40-rupee width, or 35%, and the other 65% is what you stand to lose. That lopsided ratio is normal for credit spreads that sit below the current price. You are being paid a modest amount because the odds of keeping it are, on the setup’s own logic, decent. But one bad expiry can wipe out the gains from a couple of good ones.

tastylive lists this directly among the cons: profit is capped at the net credit, which can be small compared with more aggressive strategies. We would add a practical point. If you run this trade repeatedly, your sizing has to be built around the maximum loss, not the credit. Sizing by the ₹7,000 you hope to make is how small accounts get hurt.

Size a bull put spread by what it can lose, not by what it pays you to open it.

How strike choice changes the trade

OIC makes the point that the strikes you pick decide both the income and the risk. Choosing a higher short strike or a lower long strike increases the credit you collect.

tastylive’s own two examples show the trade-off. In the first, with the stock at $50, the trader sells the 50 put for $3 and buys the 45 put for $1.50. Net credit is $1.50, which is $150 on a 100-share contract, and the maximum loss is ($50 − $45 − $1.50) × 100 = $350. In the second, the trader sells the 45 put for $2 and buys the 40 put for $0.75. Credit drops to $1.25, or $125 per contract, and the maximum loss rises to $375. Moving the strikes further from the price made the trade more forgiving on direction but worse on payout relative to risk.

Run the same idea on our hypothetical Stock A. Suppose instead you sold the 1,000 put at ₹32 and bought the 960 put at ₹14:

• Net credit = 32 minus 14 = ₹18
• Maximum loss = 40 minus 18 = ₹22
• Breakeven = 1,000 minus 18 = ₹982

More credit and a smaller maximum loss. Sounds better, until you see that the breakeven moved up from ₹966 to ₹982 and you now need Stock A to finish at or above ₹1,000, its current price, to keep everything. The first version gave the stock room to slip; this one doesn’t. There is no free lunch here, only a choice between a wider cushion and a better payout.

Width matters too. A wider gap between strikes collects more credit but also raises the maximum loss in rupees. A narrow spread keeps the worst case small but pays little. Pick the width from the loss you can stomach, then see if the credit makes it worth doing.

Time decay and volatility

OIC says the passage of time helps the position, though less than it helps a plain short put, because the decay on the two puts partly cancels out. tastylive explains the same thing through the Greeks: as expiry approaches, extrinsic value fades, and that tends to help the short put more than the long put, especially if the price holds steady or rises.

On volatility, OIC calls the effect slight, all else equal, since the two legs offset each other to a large degree. tastylive adds that a fall in implied volatility generally helps a bull put spread and a rise generally hurts it, because of the different vega of the two legs. In practice this means the trade is usually more attractive to open when option premiums are rich, and an IV spike while you hold it can push the spread’s price against you even if the stock hasn’t moved much.

Bull put spread vs bull call spread

Both are bullish verticals, so which one should you use? OIC notes that their profit-and-loss profiles at expiry are essentially the same once you adjust for the cost of carry. The main differences are the timing of cash flows and early assignment risk. The bull call spread costs money upfront for an unknown later payoff. The bull put spread gives you cash upfront in exchange for a possible payout later.

tastylive frames the choice by the size of the move you expect. The bull put spread is suited to a slightly bullish or sideways market. The bull call spread tends to need a bigger move up to pay off fully, since you want the price above the higher call strike at expiry. If you want a fuller comparison of the two styles, our piece on debit vs credit spread options goes through it side by side.

Assignment and expiry risk

This is the part people skip. The short put can be assigned. OIC says early assignment is possible at any time but generally occurs only when the put goes deep in the money, and corporate events such as mergers, spin-offs or special dividends can upset normal expectations about early exercise.

Holding through expiry adds its own risk. OIC’s warning centres on the case where the price ends just around the short strike: you may not know for sure whether you will be assigned, and you can end up with a stock position you didn’t plan for. Their suggested defences are to close the spread early or be ready for either outcome, and to watch the stock closely on the last trading day.

Settlement and exercise rules differ between markets and between index and stock options, so check the exchange’s contract specifications and your broker’s expiry policies before you hold any short option into the final day. tastylive also flags that a bull put spread may tie up margin depending on your broker, so know that number before you enter.

When a bull put spread fits, and when it doesn’t

It fits when:

• Your view is mildly bullish or neutral, not explosive.
• There is a level below the current price you are reasonably confident will hold until expiry.
• Option premiums are relatively rich, so the credit is worth the risk.
• You want to know your worst case before you click buy.

It doesn’t fit when:

• You expect a big rally. The profit is capped at the credit, so a long call or a call spread uses that view better.
• A results announcement or event could gap the stock below your long strike. The cap protects you, but you will take the full loss.
• The credit is so thin that the maximum loss is many times bigger than the profit.

For the basics of calls, puts, premiums and expiries before trying any spread, start with our options trading for beginners in India guide.

A quick bull put spread checklist

1. Write down your view: where do you think the price will not go below by expiry?
2. Pick a short put strike at or below that level, and a long put strike under it.
3. Work out the net credit, the width, the maximum loss and the breakeven before placing the order.
4. Multiply the maximum loss by the actual lot size and check it against what you can afford to lose.
5. Check margin, contract specs and any events (results, dividends, corporate actions) before expiry.
6. Decide in advance when you will exit: at a target share of the credit, at a loss limit, or before the final session.

A bull put spread won’t make anyone rich in one trade. What it offers is clarity. You know the most you can make, the most you can lose and the price where one turns into the other, all before you start. For a trader with a modest bullish view, that clarity is often worth more than open-ended upside.

Disclaimer: This article is for educational purposes only and is not investment advice. Stock A, its option premiums and the 500-share lot used in the examples are hypothetical and used only to explain the arithmetic. Options trading involves substantial risk and is not suitable for all investors. Investments in the securities market are subject to market risks. Consult a SEBI-registered investment adviser before making investment decisions.