Ratio Spread Options Strategy on Nifty: Payoff, Breakevens and the Naked Leg Risk

Most option spreads are tidy. You buy one, you sell one, and the worst case is known before you place the order. The ratio spread options strategy breaks that symmetry on purpose. You buy one option and sell two (or more) further out, which makes the trade cheap, sometimes free, and gives it a sweet spot where it pays far more than a plain spread. The price for that is one short option with nothing protecting it.

We’ll build a call ratio spread and a put ratio spread on Nifty with round, made-up premiums, work out the payoff at expiry level by level, find the breakevens, and then spend some time on the part most traders skip: what that extra short leg does to you when the market runs. All Nifty levels and premiums below are hypothetical, chosen so the arithmetic is easy to follow.

What a ratio spread options strategy actually is

Investopedia describes a ratio spread as a neutral strategy where you hold an unequal number of long and short options of the same type on the same underlying. The most common ratio is two to one: two options written for every one bought. The bought option is usually at the money (ATM) or out of the money (OTM), and the two written options sit further OTM.

There are two flavours:

• Call ratio spread. Buy one ATM or OTM call, sell two calls at a higher strike. Investopedia puts this as the choice when you’re slightly bullish but don’t expect a big move.
• Put ratio spread. Buy one ATM or OTM put, sell two puts at a lower strike. This is the slightly bearish version.

The core idea in both: you expect the index to drift, not sprint. If it sprints in the direction of your short strikes, the second short option is naked, and losses on the call side are theoretically unlimited. Investopedia says exactly that, and it’s the single most important line to remember about this trade.

One naming trap. Zerodha Varsity teaches a call ratio back spread, which flips the structure: sell one in-the-money call and buy two OTM calls. That version wants a big move and has unlimited upside. The ratio spread in this article is the opposite trade. Same “ratio” word, very different risk. Mixing them up on an order screen is an expensive mistake.

Worked example: a call ratio spread on Nifty

Say Nifty is at a hypothetical 25,000 and you think it’ll grind a little higher over the next few weeks, maybe towards 25,300, but not much beyond. You set up a 1:2 call ratio spread in the same expiry:

• Buy 1 lot of the 25,100 call at 130 points.
• Sell 2 lots of the 25,300 call at 70 points each, so 140 points received.

Net cash flow is 140 received minus 130 paid, which is a credit of 10 points. You’re being paid, slightly, to put this on. Multiply every figure below by your contract’s lot size to get rupees.

At expiry, a call is worth the greater of zero and (spot minus strike). Varsity uses this same intrinsic-value rule in its back-spread chapter. So the payoff of our position at any expiry level S is:

10 + max(S − 25,100, 0) − 2 × max(S − 25,300, 0)

Let’s walk it up the ladder.

Read the table from top to bottom and the personality of the trade shows up. Below 25,100 everything expires worthless and you keep the 10-point credit. Between 25,100 and 25,300 the long call gains while the shorts are still worthless, so profit climbs fast. At exactly 25,300 you hit the peak.

That peak matches Investopedia’s formula: maximum profit is the difference between the strikes plus the net credit. Here that’s 200 + 10 = 210 points.

Above 25,300 the two short calls start losing two points for every point Nifty rises, while the long call gains only one. Net, you bleed one point per point. Profit shrinks to zero at 25,510, which is the short strike plus the maximum profit (25,300 + 210). Beyond that, the loss keeps growing with no ceiling.

A ratio spread is a bet on where the market stops, not just which way it goes. Get the stopping point right and it pays several times a plain spread. Get the speed wrong and the extra short call does all the talking.

The same idea on the put side

Flip it for a mildly bearish view. Nifty at a hypothetical 25,000, and you expect a slow slide towards 24,700:

• Buy 1 lot of the 24,900 put at 120 points.
• Sell 2 lots of the 24,700 put at 55 points each, so 110 points received.

This time you pay 120 and receive 110, a net debit of 10 points. That small change matters, as you’ll see. The payoff is:

−10 + max(24,900 − S, 0) − 2 × max(24,700 − S, 0)

Because this one cost money to enter, it has two breakevens instead of one. If Nifty doesn’t fall at all, you lose the 10-point debit. You start making money below 24,890 (long strike minus the debit), peak at 24,700 with 200 − 10 = 190 points, and slip back to zero at 24,510. Below that, the naked put loses a point for every point of fall.

Put ratio spreads have a theoretical floor, since Nifty can’t go below zero. In practice that’s no comfort. A sharp gap-down on a global shock can take the index through your lower breakeven before you’ve had your morning tea.

Credit or debit: how strike choice changes the trade

Notice the two examples behave differently on the side you don’t expect. The credit call spread keeps 10 points if Nifty falls. The debit put spread loses 10 points if Nifty rises. Whether you end up with a credit or a debit depends on which strikes you pick and how far apart they are.

Move the short strikes closer to the long strike and each short option is worth more, so the credit grows, but the peak profit (the strike gap) shrinks and the danger zone arrives sooner. Push the short strikes further away and the credit turns into a debit, the peak gets bigger, and the naked leg sits further from spot. There’s no free version. You’re always trading off how much room you have against how much you get paid.

A practical habit: before placing the order, write down three numbers. The maximum profit, the breakeven on the naked side, and how far that breakeven is from current spot in percentage terms. In our call example, 25,510 is about 2% above a 25,000 Nifty. Ask yourself honestly whether Nifty has moved 2% inside your holding period recently. If it does that often, the trade is tighter than it looks.

The naked leg: what actually goes wrong

Investopedia’s explanation is blunt. In a normal bull call or bear put spread, every short option is matched by a long one, so a big move can’t create a big loss. In a 1:2 ratio spread, one short option is unmatched. That’s the naked leg, and it behaves exactly like a sold option with nothing behind it.

Three things tend to hurt.

Speed. The strategy needs time to drift to the short strike. A fast move through it, the kind you get on a results day, a policy surprise or a global sell-off, skips the profitable zone entirely and lands you in the loss zone.

Volatility. Because you’re net short one option, a jump in implied volatility pushes up the value of what you’ve sold more than what you’ve bought, and your mark-to-market goes red even if Nifty hasn’t moved much. Varsity’s short straddle chapter makes the related point that news drives volatility up and option sellers look to buy back once it cools. Our piece on the vega options Greek covers how much a move in implied volatility can shift premiums.

Margin. Don’t judge the trade by its premium alone. Check the margin your broker will block for the whole position before you enter, not after. With one short option uncovered, it can be far larger than the small credit or debit suggests. A trade that looks free on premium isn’t necessarily free on capital.

The premium on a ratio spread can be close to zero. The margin, and the risk behind it, never is.

Capping the risk: add a far wing

If the open-ended loss bothers you (it should), the cleanest fix is to buy one more option further out to cover the naked leg. Going back to the call example, suppose the 25,600 call costs a hypothetical 25 points. Add one long 25,600 call:

• Net cash flow becomes 10 − 25 = a debit of 15 points.
• Maximum profit at 25,300 drops to 200 − 15 = 185 points.
• The upside breakeven moves in slightly, to 25,300 + 185 = 25,485.
• Above 25,600, the extra long call gains a point for every point the naked short loses. The loss stops growing and stays fixed at 115 points.

Check that last number at 26,000: the 25,100 call is worth 900, the two 25,300 calls cost you 1,400, and the 25,600 call is worth 400. That’s 900 − 1,400 + 400 − 15 = −115. At 27,000 you get the same answer. The worst case is now known in advance.

You’ve given up 25 points of maximum profit and turned a small credit into a small debit. In exchange, a runaway rally can no longer do unlimited damage. For most retail traders, that’s a trade worth making every single time.

Managing a live ratio spread

These are habits, not rules, but they’ve saved plenty of accounts.

1. Decide your exit on the naked side before you enter. For the call version, pick a Nifty level, maybe a bit below the upside breakeven, where you’ll close or hedge the whole position. Don’t wait to see if it comes back.
2. Don’t run it through big scheduled events unless the far wing is in place. Policy days and heavyweight results weeks are exactly when speed and volatility both show up.
3. Take profits near the short strike early. If Nifty reaches 25,300 with a week left, a good chunk of the profit may already be in the mark-to-market. Holding to expiry for the last few points means sitting right next to the danger zone.
4. Close all legs together. Leaving the long call open and buying back only the shorts, or the reverse, changes the risk entirely. Treat it as one position.
5. Size it as if the naked leg is the whole trade. Because, on a bad day, it is.

Ratio spread vs short strangle vs back spread

It helps to see where this sits among its cousins.

A short strangle on Nifty sells an OTM call and an OTM put. It’s naked on both sides and wants the index to stay in a range. A call ratio spread is naked on one side only, and it has a directional lean: it actually wants Nifty to move, just a little, towards the short strike.

A ratio back spread, as Varsity lays it out, is the mirror image. Its example sells one 7,600 call at 201 and buys two 7,800 calls at 78 each for a 45-point net credit, with a breakeven at 7,645. That trade loses most if the market sits near the long strike and makes money on a big rally. If you think a big move is coming, the back spread fits. If you think the market will creep, the front ratio spread fits. Getting this backwards is the classic beginner error with ratio trades.

If you’re still finding your feet with multi-leg trades, our options trading for beginners in India guide covers the building blocks, premiums, strikes and expiry, that every one of these structures is made from.

Quick checklist before you place one

• Is your view “slow drift to a level,” not “big move”? If not, this isn’t the trade.
• Have you calculated max profit, the naked-side breakeven and the percentage distance to it?
• Credit or debit? Know what happens if the market goes the “wrong” way.
• Is there a big event before expiry? If yes, add the far wing or wait.
• Have you checked the margin your broker will block for the uncovered leg?
• Is your exit level on the naked side written down?

The ratio spread is a precise tool. When the market behaves the way you thought it would, it pays handsomely for very little outlay. When it doesn’t, the extra short option makes sure you notice. Respect that leg, cap it where you can, and the strategy earns its place in the toolkit.

Disclaimer: This article is for educational purposes only and is not investment advice. All Nifty levels, strikes and premiums in the examples are hypothetical and chosen for illustration. Options trading involves substantial risk, including losses greater than the premium received. Please do your own research or consult a SEBI-registered investment adviser before making any trading decision.