Several pages on this site recommend spreads over single options without ever showing what a spread actually is. This is that article, and it covers the two simplest ones.
Both are built from two options on the same underlying and expiry. Both trade some potential gain for a loss that is known exactly before you enter. That trade is the entire point.
The bull call spread, worked through
You expect the underlying to rise, but only moderately, and you do not want the full cost or open-ended exposure that other bullish positions carry.
You buy one call option at a lower strike and sell one call option at a higher strike, both with the same expiry. The premium you receive for the higher strike partly pays for the one you bought.
Take illustrative figures, per unit of the underlying. The index is at 22,000. You buy the 22,000 strike call option for 180 and sell the 22,300 strike call option for 70. Your net cost is 110.
Maximum loss: 110, the net premium paid. If the index finishes at or below 22,000, both options expire worthless and that is all you lose.
Maximum gain: the gap between strikes minus the net cost — 300 minus 110, which is 190. That is reached if the index finishes at or above 22,300.
Break-even: the lower strike plus the net cost, so 22,110.
Multiply every figure by the lot size to get rupees. The numbers here are illustrative; real premiums depend on volatility and time to expiry. What does not change is the arithmetic: loss limited to the net debit, gain limited to the strike width minus that debit.
The bear put spread, the mirror image
You expect a moderate fall and want the same kind of defined risk.
You buy one put option at a higher strike and sell one put option at a lower strike, same expiry. Again, the sold option reduces the cost of the one you bought.
Illustratively: the index is at 22,000. You buy the 22,000 put option for 170 and sell the 21,700 put option for 65. Net cost: 105.
Maximum loss: 105, if the index finishes at or above 22,000.
Maximum gain: 300 minus 105, which is 195, if the index finishes at or below 21,700.
Break-even: the higher strike minus the net cost, so 21,895.
Both of these are debit spreads: you pay to enter, and the most you can lose is what you paid. There are also credit spreads, built the other way round — selling the nearer strike and buying the further one, collecting premium upfront. Credit spreads also have a defined maximum loss, set by the strike width minus the credit received, but their risk profile resembles option selling: frequent small gains, occasional larger losses up to that cap.
What the cap actually costs you
A spread is not a free improvement on buying a single option. It is a trade, and it is worth being clear on both sides of it.
You give up the large move. If the index in the bull call example rises to 23,000, a plain long call option gains enormously while your spread still stops at 190. For somebody expecting a dramatic move, the spread is the wrong structure.
You pay two sets of costs. Brokerage, statutory charges and the bid-ask spread apply to both legs, entering and exiting. On a small position those costs are a meaningful share of the maximum gain.
In return, you get three things. A lower entry cost than the single option. Less damage from time decay and falling volatility, because the sold leg is losing value too and partly offsets the bought one. And a worst case you can write down as a number before entering — which is what makes position sizing possible in the first place.
That last point is why spreads matter for smaller accounts in particular. It is very hard to size a position whose loss has no defined limit. It is straightforward to size one whose loss cannot exceed a known figure.
Practical details that catch people
Enter both legs together. Placing one leg and waiting for a better price on the other leaves you holding a single option with exactly the risk you were trying to avoid. Most brokers support placing multi-leg orders together.
Close both legs together too. Exiting the bought leg for a profit and leaving the sold leg open converts a defined-risk position into an open-ended one without you noticing.
Margin is lower than for a naked short option, not zero. Because the bought option hedges the sold one, the blocked amount reflects the capped risk. Exact requirements vary and are shown before you place the order.
Stock options add expiry risk. On single-stock contracts, a spread left open into expiry can create delivery obligations on one or both legs. On stock options, close before expiry unless you have planned for settlement.
Choose the width deliberately. A narrow spread is cheaper with a smaller maximum gain; a wide spread costs more and behaves more like a single option. Neither is correct in general. The width should match the size of move you actually expect, not the maximum gain you would like to see.
An account that places spreads together
Margin and maximum loss shown before you confirm. Free to open
All figures above are illustrative and chosen to show the arithmetic, not actual market prices. Contract specifications, lot sizes and margin rules are set by the exchanges and revised periodically. This is educational material, not advice, and nothing here recommends a position. We run no tips group and no signal service, we manage nobody's money, and no return is promised. Options can lose the entire premium paid, and credit structures can lose more than the premium collected.
Disclosure: the account-opening link on this page is under Atul Shrivastava's Zerodha Authorised Person registration (NSE AP Reg: AP2516003481; Zerodha Broking Ltd. SEBI Reg: INZ000031633) and earns a revenue share. TheFinBaba is not a SEBI-registered Investment Adviser — this content is educational, not investment advice.
Frequently Asked Questions
What is a bull call spread?
Buying a call option at one strike and selling another call option at a higher strike, same underlying and expiry. The maximum loss is the net premium paid and the maximum gain is the strike width minus that premium. It suits a moderately bullish view with defined risk.
What is the maximum loss on a bear put spread?
The net premium paid to enter it. That happens if the underlying finishes at or above the higher strike, where both put options expire worthless. The maximum gain is the strike width minus the net premium.
Is a spread better than buying a single option?
It is cheaper and has a defined worst case, and it suffers less from time decay. It also caps your gain, so it is the wrong choice if you expect a very large move. It is a trade-off, not a strict improvement.
Do spreads need margin?
Debit spreads mainly require the net premium. Credit spreads block margin, but much less than a naked short option because the bought leg caps the risk. Exact requirements depend on the broker and are shown before placing the order.
What is the difference between a debit spread and a credit spread?
In a debit spread you pay to enter and your maximum loss is that payment. In a credit spread you receive premium upfront and your maximum loss is the strike width minus the credit. Both are defined-risk, but credit spreads behave more like option selling.
Related Reading
- Options taught with the worst case first, in Kolkata
- Two spreads combined into a condor
- Structures without a capped loss
- How the sold leg offsets decay
- Why stock option spreads need closing before expiry
- Defined-risk structures, taught before selling
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
