“If I buy a call and a put, won't one of them make money whichever way the market goes?”
It's a reasonable question. A call benefits from some upward moves, and a put from some downward moves. Holding both seems to solve the problem of choosing a direction.
The missing part is the bill. A long straddle buys a call and a put with the same strike and expiry on the same underlying, in matched quantities. You pay both premiums. For the combined trade to work, the value you recover has to cover that combined cost, not just the price of the winning leg.
Let's follow a hypothetical index at 20,000 and give both options a place in every calculation.
Put the two premiums together before anything else
Suppose the 20,000 call costs 120 points and the 20,000 put costs 100 points. Buying both costs 220 points per underlying unit, before charges and execution differences.
This is a long straddle. Using different strikes would produce a different structure, commonly a long strangle, and different payoff calculations. Matching the expiry and quantities matters too.
On Neostox's advanced options chain, check the full contract details and current displayed quotes for the practice context. A call and put can share a strike while belonging to different expiries. Don't let a matching number in the strike column hide that mismatch.
For now, assume both legs are acquired at the hypothetical premiums above. The number to keep in view is 220. The position hasn't become inexpensive merely because either side can respond to movement.
A small rise can leave the whole trade losing
At expiry, suppose the relevant final settlement value is 20,150. The call has intrinsic value of 150 points. The put has none because the underlying is above the strike.
The combined expiry payoff is therefore 150 points. Subtract the 220-point entry cost and the result is a 70-point loss before costs.
The market rose. The call finished in the money. The straddle still lost money. All three statements can be true because the call's payoff wasn't large enough to repay the cost of both options.
This is the difference between correctly anticipating movement and buying that movement at a workable price. Neostox's explanation of intrinsic value versus time value is useful here: being in the money describes the relationship to the strike, not whether the total trade has earned back its premium.
Find the two expiry breakevens
The upper expiry breakeven is the strike plus the combined premium: 20,000 plus 220, or 20,220. The lower one is the strike minus the combined premium: 20,000 minus 220, or 19,780.
At either point, the option that has intrinsic value contributes 220 points and the other contributes zero. That exactly covers the entry debit before costs.
At 20,400, the call contributes 400 points and the put contributes zero. Net profit is 180 points. At 19,600, the put contributes 400 and the call zero, again leaving 180 points in this simplified example.
These outcomes show what “either direction” really means. Direction can vary, but the final distance from the strike has to be sufficient. Charges push the practical recovery requirement further, and actual fills can change the original debit.
What happens if the market finishes where it started?
If the final value is exactly 20,000, both options have zero intrinsic value. The full 220-point debit is lost before costs. That is the maximum expiry loss for the matched long position in this example.
Suppose the hypothetical quantity is 25 underlying units. The entry debit and maximum premium loss would be ₹5,500. The 70-point loss in our small-rise scenario would be ₹1,750, and the 180-point gain in either larger-move scenario would be ₹4,500, all before costs.
Those units are chosen only to make the arithmetic concrete. Use the actual multiplier for a listed contract. A “small” premium quoted in points can represent a much larger cash amount after multiplication, especially across several lots.
The loss being limited to the premium doesn't make it unlikely. It describes the shape of the payoff, not the probability of a disappointing outcome.
Before expiry, distance isn't the whole explanation
So far, we've calculated expiry payoffs. Before expiry, both options can have time value, and their market prices respond to time remaining and implied volatility as well as the underlying.
Imagine you buy the pair before a widely anticipated event. The market moves afterwards, but expectations of further movement fall. A reduction in implied volatility can hurt the combined option value even though one directional component helped.
That doesn't mean every event produces the same result. It means the event's actual movement must be considered alongside what was already priced into the premiums. Neostox's article on why a call can fall when the market rises explains the same basic problem for a single option.
Likewise, time passing generally works against a long straddle when other inputs are held constant. Waiting longer for the hoped-for move is not costless. A decision to exit before expiry therefore needs its own rule rather than borrowing the expiry breakevens as exact live P&L boundaries.
Review the pair, not the attractive screenshot
Suppose your call is showing a gain and your put a larger loss. Sharing only the call result would tell an incomplete story about the strategy. Add both values, subtract both entry costs and include the relevant charges.
If you close one leg and keep the other, record that decision as a change in the position. From that point, you no longer hold the original two-leg straddle. Its remaining behaviour and risk are different.
Neostox's trading reports can help you review the recorded practice orders and results. Keep a shared note for the two legs in your own journal, including entry time, expiry, quantities, combined debit and planned exit condition.
For a useful practice comparison, record examples that barely move as carefully as the dramatic ones. A strategy built around large moves will look flattering if the quiet outcomes never enter the notebook.
Answer the original question with the full cost
Buying a call and a put gives exposure to a sufficiently large move in either direction. It doesn't turn every move into a profit. Our 150-point rise still left a 70-point loss because the pair cost 220.
Before practising a long straddle, calculate the combined debit, both expiry breakevens and the result if the market barely changes. Then write down how you would manage the position before expiry, when time and volatility still matter. That gives you a complete question to test instead of the comforting but incomplete idea that one leg must win.