Ratio Spreads in Options: Setup, Payoff and Real Risks
A ratio spread is an options position where you buy and sell unequal numbers of contracts in the same underlying and expiry, most often buying one option and selling two further out of the money. Because you sell more premium than you buy, the trade usually starts with a credit.
The defining feature of a ratio spread is that one short option is not covered by a long option, so beyond a certain price the loss behaves like a naked short and has no cap.
Below: how the position is assembled, a Nifty payoff worked out in rupees, where the profit comes from, and the ways this structure hurts traders who treat it as a safe income trade.
How the position is assembled
Start from a vertical spread: buy one option, sell one at a different strike. A ratio spread changes only the quantity on one leg.
Call ratio spread
Buy 1 call at a lower strike, sell 2 calls at a higher strike, same expiry. You want the underlying to rise gently and stall near the short strike. A sharp rally is the enemy.
Put ratio spread
Buy 1 put at a higher strike, sell 2 puts at a lower strike. You want a mild decline that stops near the short strike. A crash is the enemy, and crashes come with expanding volatility, making the short puts more expensive to close.
Front spread and back spread
Selling more than you buy is a front ratio spread. Reverse it, buying two and selling one, and you have a back spread: a debit position that bleeds in a quiet market and pays off in a violent move. Our guide to the bull call spread is the foundation this sits on.
Worked example on Nifty in rupees
Suppose Nifty is at 25,000 and the lot size for this illustration is 75. Confirm the current lot size and expiry schedule on the exchange website before placing anything.
You buy 1 lot of the 25,000 call at Rs 320 and sell 2 lots of the 25,300 call at Rs 190 each.
- Premium paid: 320 x 75 = Rs 24,000.
- Premium received: 190 x 2 x 75 = Rs 28,500.
- Net credit: 28,500 minus 24,000 = Rs 4,500, or Rs 60 per unit.
Payoff per unit is the long call value, minus twice the short call value, plus the Rs 60 credit.
| Nifty at expiry | Long 25,000 CE value | Two short 25,300 CE value | Net per unit | Profit or loss on one lot |
|---|---|---|---|---|
| 24,900 | 0 | 0 | +60 | +Rs 4,500 |
| 25,000 | 0 | 0 | +60 | +Rs 4,500 |
| 25,150 | 150 | 0 | +210 | +Rs 15,750 |
| 25,300 | 300 | 0 | +360 | +Rs 27,000 |
| 25,500 | 500 | 400 | +160 | +Rs 12,000 |
| 25,660 | 660 | 720 | 0 | Rs 0 |
| 26,000 | 1,000 | 1,400 | -340 | -Rs 25,500 |
Maximum profit is Rs 27,000, exactly at the short strike of 25,300. Upper breakeven is 25,660, where 660 minus 720 plus 60 equals zero. Above that, every index point costs Rs 75, one lot of naked short exposure, with no upper limit.
Notice the asymmetry. A 300 point rally hands you Rs 27,000. A 1,000 point rally costs Rs 25,500, and a 2,000 point rally about Rs 1,00,500. Downside grows in a straight line while upside is fixed.
Where does the profit actually come from?
Three sources, in rough order of importance.
Time decay on the two short options, faster in rupee terms than decay on your long option once the underlying sits below the short strike. Our explainer on theta decay covers why that accelerates near expiry.
A fall in implied volatility, which shrinks the net short position. Entering when volatility is unusually high is much of the edge.
Direction, but a narrow kind: a drift towards the short strike that stops there. This is the hardest part, and the reason traders who understand the payoff still lose on it.
The risks the payoff chart does not show
The extra short option is uncovered, so the position is margined like a short options trade. Expect to block far more capital than the Rs 4,500 credit suggests. Read our note on options margin requirements before sizing the trade.
- Gap risk. A large overnight move can take the underlying past breakeven before you can act. Stop loss orders do not protect through a gap.
- Margin escalation. As the short strike is breached, SPAN and exposure margin both rise, and traders get squared off by the broker rather than by their own plan.
- Settlement. Index options in India are European style and cash settled. Stock options are physically settled on expiry, a serious problem for an uncovered short leg.
- The STT trap. Letting a small in the money option expire attracts STT at 0.15% on settlement value rather than premium, which can cost far more than squaring off.
Plain risk note: a front ratio spread has undefined loss on one side. Only trade it with capital you can afford to lose, and only after running the arithmetic on what a three sigma move would do to your account.
When does a ratio spread make sense?
It fits a narrow set of conditions.
- You have a mild directional view and a level where you expect the move to stall, such as a well tested resistance zone.
- Implied volatility is elevated against its own recent range, so you are selling expensive options rather than cheap ones.
- There is enough time to expiry that decay works for you, but not so much that a trend has room to run away.
- Your account can absorb the margin and a loss several times the credit received.
- You have written down, before entry, the price at which you will close or convert.
If any of those five is missing, a plain vertical spread with defined loss is the better trade. Giving up some credit to cap the downside is a bargain most of the time.
Managing the position once it is live
The clean fix is to buy back one short option, turning the structure into an ordinary vertical spread. You pay for it, and risk becomes finite again. Do this as the underlying approaches the short strike with time still left, not after it has blown through.
Rolling the short strike further out gives you room but adds uncovered exposure, so it is not a repair. It is a bigger bet with a nicer name.
The most common mistake is holding into expiry week hoping the underlying settles exactly at the short strike. Maximum profit sits at one price. Aiming for it is not a plan.
Frequently Asked Questions
Is a ratio spread the same as a broken wing butterfly?
They are close cousins. A broken wing butterfly adds a further out of the money long option to cap the runaway side, converting unlimited loss into a defined one. If the payoff appeals but the tail risk does not, the butterfly is the more sensible version of the same idea.
Can I run a ratio spread on stock options in India?
You can, but physical settlement makes it risky. Stock derivatives in India are settled by actual delivery on expiry, so an uncovered short call finishing in the money can create a delivery obligation you never intended. Close these positions well before expiry day, or avoid the segment.
What happens if implied volatility spikes after I enter?
The position loses value on paper, because two short options gain more from rising volatility than one long option does. Even if the underlying has not moved, the mark to market goes against you and margin rises. This is why entry volatility matters more here than in a plain vertical.
Which is safer, a call ratio spread or a put ratio spread?
Neither is safe, but put ratio spreads are harsher in practice. Markets fall faster than they rise and volatility expands during falls, so the short puts move against you on two fronts at once. Traders underestimate how quickly those two effects compound in a single session.
Should a beginner trade ratio spreads at all?
Not as a first strategy. Learn defined risk verticals first, place enough of them to see how decay and volatility actually behave, and only then add a structure with an uncovered leg. Our overview of naked options explains the exposure you would be taking on.
Key Takeaways
- A 1 by 2 front ratio spread sells more options than it buys, so one short leg is uncovered and loss above breakeven is unlimited.
- In the example, maximum profit of Rs 27,000 sits at the short strike, breakeven is 25,660 and each point beyond costs Rs 75.
- Profit comes mainly from time decay and falling implied volatility, and margin is charged on the uncovered short leg.
- Buying back one short option converts the trade into a defined risk vertical; rolling the strike does not reduce risk.
- Index options are cash settled and European style, but stock options are physically settled, making an uncovered short leg dangerous at expiry.
