Bull Call Spread
A long call with the far-fetched upside sold off to pay for it. The bull call spread is what a bullish view looks like once it has a budget.
In short: a bull call spread is a long call at a lower strike and a short call at a higher strike, same expiry, same quantity, entered for a net debit. Profit grows as the underlying rises, up to the higher strike, where it is capped at the strike difference minus the debit. The maximum loss is the debit. It costs less than a bare call, needs a smaller move to break even, and gives up the gains beyond the upper strike.
The intuition
A trader who expects Nifty to rise to 24,500 does not need the right to buy at 24,000 all the way to 26,000; they need it to 24,500. The part of a long call that pays beyond 24,500 is paid for in the premium but not wanted. Selling a 24,500 call hands that unwanted part to someone else and collects its price, which lowers the cost of the position and brings the break-even closer. The trade is bullish, defined-risk, and honest about the size of move it expects.
The price of that honesty is the cap. If Nifty rises to 25,500 the spread makes exactly what it would have at 24,500 and no more. The spread is therefore a trade for a measured view, where the extra probability of profit matters more than the open-ended payoff.
Formula
Net debit = lower-strike call premium − higher-strike call premium
Maximum profit = (higher strike − lower strike − net debit) × lot size, at or above the higher strike
Maximum loss = net debit × lot size, at or below the lower strike; break-even = lower strike + net debit
The spread is long delta, with small net gamma and vega near entry because the two legs largely offset; theta is slightly negative when the underlying is below the midpoint and turns positive as the spread moves into the money.
Worked example (illustrative numbers)
Suppose NIFTY is at 24,000 with 30 days to expiry and implied volatility of 13%. Buy the 24,000 call at ₹424, sell the 24,500 call at ₹205. Net debit ₹219 per unit, ₹14,235 per lot (65 units). Break-even 24,219.
| Nifty at expiry | 24,000 call | 24,500 call | Spread value | P&L per lot |
|---|---|---|---|---|
| 23,500 | 0 | 0 | 0 | −₹14,235 (maximum loss) |
| 24,000 | 0 | 0 | 0 | −₹14,235 |
| 24,219 | 219 | 0 | 219 | 0 (break-even) |
| 24,500 | 500 | 0 | 500 | +₹18,265 (maximum) |
| 25,000 | 1,000 | 500 | 500 | +₹18,265 |
Compared with the bare 24,000 call at ₹424, the spread costs about half, breaks even 205 points sooner, and returns up to 128% of the debit against a loss of 100%. The bare call would make ₹37,440 at 25,000; the spread stops at ₹18,265. For a trader who thinks 24,500 is the realistic target, the spread is the better-shaped bet; for one who expects a breakout, it is the wrong one.
Why it matters to an options trader
- It is the standard defined-risk bullish trade. Loss is known at entry and never exceeds the debit, which makes sizing straightforward.
- It is largely immune to volatility. The long and short legs’ vega mostly cancel, so a fall in implied volatility after entry, which hurts a bare call, barely affects the spread.
- Strike choice sets the character. A wide spread behaves more like a bare call; a narrow one is almost a binary bet on finishing above the upper strike.
- It is cheap in margin. The long call covers the short, so SPAN charges little beyond the debit; on NSE the broker typically blocks the debit plus a small spread margin.
Common mistakes
- Closing the long leg first. The remaining short call is naked and attracts full margin immediately; close the short leg first or both together.
- Expecting the full value before expiry. A spread deep in the money with time left trades below its maximum because the short call still has time value; the cap is reached fully only at expiry.
- Buying the spread too far out of the money for a tiny debit. The probability of reaching the lower strike, not the cheapness, is what matters.
- Letting a stock spread settle in the money on NSE. Both legs are physically settled: the long call takes delivery and the short call delivers, usually netting off, but funding and delivery margins apply in expiry week.
Indian-market specifics
- Index spreads (Nifty, Bank Nifty, FinNifty, Sensex) settle in cash at expiry; the spread’s value is paid as the difference between the two legs’ intrinsic values. Nifty expires on Tuesday (weekly and monthly); Sensex on Thursday; other indices monthly on the last Tuesday.
- Stock spreads are physically settled: an in-the-money long and short leg at expiry create offsetting delivery obligations, but brokers block delivery margins from E-4 regardless, and a leg that finishes between the strikes leaves a one-sided delivery.
- Margin: SPAN recognises the hedge, so the requirement is close to the net debit plus a spread charge; exchanges have set minimum spread margins by circular. The margin benefit exists only while both legs are open.
- STT: 0.15% of premium on the sale of the short leg; if the long leg is exercised at expiry, 0.15% of intrinsic value on the holder; strikes near the cap are often closed before settlement to avoid it.
- Lot sizes: Nifty 65, Bank Nifty 30, FinNifty 60, Sensex 20; the 24,000/24,500 example is ₹32,500 of spread width per Nifty lot.
FAQ
What is the maximum profit on a bull call spread?
Strike width minus debit: ₹18,265 per lot in the example.
What is the maximum loss?
The debit paid: ₹14,235 per lot in the example.
When is a bull call spread better than buying a call?
For a measured rise, in high IV, or when a defined loss matters.
How much margin does a bull call spread need on NSE?
Roughly the debit plus a small spread charge, while both legs are open.
Compare the spread with the bare call before entry
The bull call spread strategy page shows payoff tables and strike pairs. In the app, the Option Chain page gives the premiums and Greeks for both strikes for both strikes.
Related terms
- Bear Put Spread, the mirror for a bearish view
- Long Call, the uncapped version
- Defined Risk, why the loss is known
- Vega, what the two legs cancel