The Bull Call Spread

Suppose you are gently bullish on RELIANCE. You think it drifts up over the next month, maybe toward 1360, but you are not expecting a moonshot. You could just buy a call, but a lone 1320 call costs about Rs 31 a share, Rs 15,590 for the lot, and it only starts paying off after a fairly big move. There is a smarter, cheaper way to back that mild view, and it is the first strategy every options trader should learn. It is the bull call spread, a two-legged, defined-risk trade that lets the market itself fund part of your bet.

What a bull call spread is

A bull call spread has exactly two legs, both calls, on the same expiry.

You buy the 1320 call, which is the leg that profits if RELIANCE rises. Then you sell the 1360 call at a higher strike, which brings in premium. The premium you collect from the sold call pays down a large part of the cost of the call you bought. The result is a position that still profits on a rise, but costs far less than the lone call did.

That net cost is the net debit, and for this spread it works out to about Rs 7,795 for one lot. Because you paid that money up front and can never be asked for more, the net debit is also the most you can ever lose. This is what makes the bull call spread a defined-risk trade.

The three numbers

Here is everything the strategy builder reports for the RELIANCE bull call spread, with spot at 1318 and expiry 28 July 2026.

Read them one at a time.

• The maximum loss is Rs 7,795, the net debit you paid. You suffer it if RELIANCE closes at or below 1320, where both calls expire worthless and your whole outlay is gone. On the chart this is the flat floor on the left.
• The breakeven is 1336. RELIANCE must close above this for the trade to make money. It sits a little above the bought strike of 1320, because the stock first has to rise enough to earn back the net debit before you are in profit.
• The maximum profit is Rs 12,205, reached if RELIANCE closes at or above 1360 at expiry. Above 1360 the sold call cancels any further gains from the bought call, so your profit stops climbing. On the chart this is the flat ceiling on the right.

Reading the chart

Walk the solid white expiry line from left to right and the whole trade tells its story.

Below 1320, both calls are worthless. You are sitting on your maximum loss of Rs 7,795, the flat floor. As RELIANCE climbs past 1320 the bought 1320 call starts gaining intrinsic value, so your loss shrinks. At the breakeven of 1336, marked by the amber dot, the line crosses zero and you move into profit. From 1336 up to 1360 you are firmly in the green profit zone, your gains growing with every rupee RELIANCE adds. At 1360 the sold call comes alive and begins offsetting further gains, so the line flattens onto its ceiling of Rs 12,205 and stays there no matter how high RELIANCE goes.

The dotted cyan line is the value today, the T+0 curve, smoother because time value is still in the options. The amber dotted vertical marks spot 1320. As the days pass toward expiry, that dotted line settles down onto the solid one.

Three ways expiry can play out

It helps to walk through the actual outcomes, because the chart shape becomes obvious once you have lived through each ending in your head. There are really only three places RELIANCE can finish relative to your two strikes on 28 July 2026.

• RELIANCE closes at or below 1320. Both the 1320 call and the 1360 call expire worthless. You keep nothing of value, and the net debit you paid is gone. You lose the full Rs 7,795, your maximum loss. This is the bet not working.
• RELIANCE closes between 1320 and 1360, say at 1345. Your bought 1320 call is worth 25 points of intrinsic value, while the sold 1360 call is still worthless. You collect that intrinsic value, subtract the net debit you paid, and the result is your profit. At 1345 you are comfortably above the 1336 breakeven and sitting in the green. This is the middle ground where the spread earns a partial reward.
• RELIANCE closes at or above 1360, say at 1380. Now both calls have intrinsic value. The 1320 call is worth 60 points and the sold 1360 call costs you back 20 points, leaving a net 40 points, the full strike width, worth Rs 20,000. Subtract the Rs 7,795 debit and you bank the maximum profit of Rs 12,205. Anything above 1360 gives the same result, because the sold call grows exactly as fast as the bought one from there.

Seeing these three endings is the whole strategy. The flat floor, the rising middle, and the flat ceiling on the chart are just these three scenarios drawn as one continuous line.

Why prefer it over a lone call

The bull call spread is not always better than a plain bought call. It is better for a specific, common view, and worse for another.

• Choose the spread when you expect a moderate move, roughly to 1360 and not far beyond. The sold call cuts your cost from about Rs 15,590 down to Rs 7,795, so you risk less and your breakeven of 1336 is closer than the lone call's breakeven near 1351. You profit sooner and on a smaller move.
• Stay with the lone call when you expect a genuine moonshot, a violent run well past 1360. The sold call caps your upside at 1360, so a huge rally that the lone call would ride all the way up is wasted on the spread. You traded that unlimited upside away in exchange for a lower cost.

In short, the bull call spread says, I am bullish but realistic. You give up the dream of unlimited gains and in return you pay less, risk less, and reach profit on a smaller move. For a beginner backing a mild view, that is usually the wiser trade.

What it costs you and how to size it

Every benefit has a price, and for the bull call spread the price is your capped upside. You will never catch the full run of a runaway rally, because the sold 1360 call gives back everything the bought call earns above that strike. You accepted that cap deliberately, in exchange for paying less and breaking even sooner. That is a fair trade for a moderate view, but you should make it with open eyes.

On sizing, the comfort of defined risk is that the worst case is printed in advance. One lot risks Rs 7,795. If you trade two lots you risk Rs 15,590, and so on. Decide first how much you are willing to lose if RELIANCE simply sits still or falls, then count back to how many lots that allows. Never size to the maximum profit, always size to the maximum loss, because the loss is the number that actually tests your account.

You have now built and read your first real strategy end to end. The bull call spread is the cleanest expression of a mildly bullish, defined-risk view, and its logic carries straight into the rest of the course. In the next chapter we keep the bullish view but flip the construction, collecting a credit up front instead of paying a debit, with the bull put spread.