A bull call spread is a way to bet on a rise for less money than a plain call. You buy one call at a lower strike and sell one call at a higher strike, both on the same underlying and the same expiry. The premium you receive for the sold call pays for part of the call you bought. Because you pay more than you receive, it is a debit spread.
The cost of the saving is a cap: above the higher strike, the sold call loses as much as the bought call gains, so profit stops growing. If you have not met the single-option version yet, read the long call strategy first.
How the payoff works
- Below the lower strike at expiry: both calls are worthless. You lose the net debit, the most you can lose.
- Between the strikes: the bought call has value and the sold call does not. Profit rises one point for each point of the index.
- Above the higher strike: both calls are in the money; gains on one cancel losses on the other. Profit is fixed at its maximum.
Net debit = premium of bought call − premium of sold call
Max profit = (higher strike − lower strike) − net debit · Breakeven = lower strike + net debit
A worked NIFTY example
NIFTY is at 25,000. You expect a rise toward 25,200 by expiry, but not a lot more. You:
- Buy the 25,000 call for ₹180
- Sell the 25,200 call for ₹90
Net debit = 180 − 90 = ₹90. Strike width = 200. Maximum profit = 200 − 90 = ₹110. Breakeven = 25,000 + 90 = 25,090.
| NIFTY at expiry | 25,000 call | 25,200 call (sold) | Profit or loss per unit |
|---|---|---|---|
| 24,800 | 0 | 0 | −90 |
| 25,000 | 0 | 0 | −90 |
| 25,090 | 90 | 0 | 0 |
| 25,150 | 150 | 0 | +60 |
| 25,200 | 200 | 0 | +110 |
| 25,400 | 400 | −200 | +110 |
| 25,800 | 800 | −600 | +110 |
Compare with buying the 25,000 call alone for ₹180: its breakeven would be 25,180 and the worst case a ₹180 loss. The spread halves the cost and the breakeven comes 90 points sooner, but a big rally to 25,800 would have paid ₹620 on the single call versus ₹110 on the spread. With a lot of 75 units (check the current lot size), the spread risks ₹6,750 to make up to ₹8,250.
Live example: pricing a spread from today's chain
To price a real bull call spread, take two call prices from the same expiry in the option chain:
Pick a lower strike to buy and a higher one to sell, subtract the second call price from the first, and you have the net debit. Then check the ratio of maximum profit to maximum loss: a spread that costs nearly the full strike width has little room to pay.
The market's expected move helps choose the upper strike:
Placing the sold strike near the top of the expected range is a common way to cap only the part of the rally that the market sees as less likely.
Choosing the strikes and width
- Buy at the money, sell out of the money (as above): the usual version, with a reward around equal to the risk.
- Both strikes out of the money: cheaper, higher reward-to-risk, but needs a larger rise and has a lower chance of paying.
- Buy in the money, sell at the money: costs more, higher chance of profit, smaller reward compared with the risk.
- Wider strikes behave more like a plain long call; narrower strikes cost less but cap profit sooner.
The strategy builder lets you change the strikes and see the maximum profit, maximum loss and breakeven update straight away.
Time decay and volatility in a spread
Because you own one call and sold another, much of the time decay and volatility effect cancels. A bull call spread loses value to time far more slowly than a single bought call, and a fall in implied volatility hurts it less. This is a key reason traders use spreads around events, when buying a single call would expose them to IV crush.
The flip side is that the spread moves slowly before expiry. Even if NIFTY jumps to 25,300 the next day, the spread may be worth only a little more than you paid, because the sold call still holds time value. Most of the maximum profit arrives in the last days if NIFTY stays above the upper strike.
Managing the spread before expiry
A bull call spread is usually closed as one unit: sell the call you bought and buy back the call you sold, in the same order where your broker supports it. Common plans:
- Take profit early: many traders close once the spread is worth around two-thirds to three-quarters of its maximum, because waiting for the last part means carrying the risk of a reversal for little extra reward.
- Cut the loss: if NIFTY breaks below a level that proves the bullish idea wrong, closing early often saves part of the debit, since both legs still hold some time value.
- Roll up: after a strong rise, close the spread and open a new one at higher strikes, keeping some profit and staying in the trend.
Watch the last day closely. If NIFTY finishes between the two strikes, only the bought call is in the money, and its value is settled in cash for index options. For stock options, which are physically settled in India, an in-the-money leg can lead to delivery of shares, so stock spreads are best closed before expiry. Check your broker's rules for expiry week margins as well.
The same spread can be built on BANKNIFTY or stocks, with strike widths adjusted for their larger or smaller moves. A 200-point width on NIFTY is roughly similar, in percentage terms, to a 400 to 500-point width on BANKNIFTY.
Bull call spread vs bull put spread
Both make money if the price rises or holds up. A bull call spread is paid for up front and needs a rise; a bull put spread collects a credit and can profit even if the price goes nowhere. With the same strikes they have nearly the same payoff, and the choice usually comes down to prices, margin and whether you prefer paying or collecting the premium.
Common mistakes
- Expecting a big quick profit. The spread's value grows slowly until close to expiry.
- Paying too much. A debit close to the strike width leaves almost no reward.
- Legging in. Buying one call and waiting to sell the other exposes you to the market in between. Place both together where your broker allows.
- Ignoring costs. Two legs to open and two to close double the brokerage and charges.
- Using it on a stock with thin options. Wide bid-ask spreads can take a big share of the maximum profit.