Contango vs Backwardation: The Indian Guide

Think of the futures curve like a railway timetable. The spot price — what one share costs if you buy it on the NSE today — is where the train is right now. The near-month, next-month and far-month futures contracts are stations further down the line, each one a few weeks ahead. If each later station is priced a little higher than the one before it, the line slopes up. That upward slope is contango.

Pull up a Reliance quote on a normal trading afternoon. Cash share at ₹2,840, near-month future at ₹2,855, far-month future at ₹2,870. Draw a line through those three prices and it slopes gently upward. That upward slope is contango, and it is what an Indian equity curve looks like on most days of the year.

Open the same screen on the morning after ITC announces a ₹15 special dividend, or in the middle of a sharp sell-off, and the slope can invert. The future trades below the cash share. That is backwardation, and it almost always carries a message.

One word matters before we go further. Basis simply means the futures price minus the spot price. If Reliance spot is ₹2,840 and the near-month future is ₹2,855, the basis is plus ₹15. If the future slips to ₹2,830, the basis is minus ₹10. A positive basis is the technical name for contango. A negative basis is the technical name for backwardation.

This article walks through what each term actually means on the NSE, why the curve normally slopes up, the three triggers that flip it into a discount, how traders read the shape day to day, and three places where a beginner can quietly leak money to the wrong call on contango or backwardation.

What contango and backwardation actually mean

Three futures contracts on the same underlying are listed at any moment on the NSE. The near month, the next month, and the far month, defined in the official NSE equity derivatives contract specifications.

Plot their prices alongside the cash market — the share price you would pay if you bought the stock outright today — and the line that connects them is called the futures curve. The shape of that line has only two names worth learning.

Contango is the shape where the curve slopes up to the right. The near-month future trades above the cash, the next-month future trades above the near month, and so on. This is the default state of an Indian equity contract.

Backwardation is the opposite shape. The future trades at a discount to the cash market and the curve slopes down. On Indian equities this is the rarer state and it shows up for specific reasons that can usually be named.

Most pieces written on this topic stop here, as if the words alone were the point. The words are not the point. The point is what each shape is telling a trader about the supply and demand on the futures contract.

Why the curve normally slopes up

A futures contract lets a trader take a view on a share without paying the full share price up front. Margin sits with the broker, the rest of the money keeps earning interest somewhere else.

That convenience is not free. The seller of the future is the natural counterpart of that bargain. They either hold the share or finance the share in some way, and they have to be paid for the cost of that capital until expiry.

The price they ask is the cost of carry — the financing cost of holding the underlying share until the contract expires. Multiply the spot price by the interest rate, scale it down to the number of days left until expiry, and that is the premium the next-month future should trade above the cash market by.

Net out anything the share is expected to pay back to the holder before expiry. The biggest item there is dividends. A share that goes ex-dividend — past the date from which a new buyer no longer qualifies for the upcoming payout — hands a slice of cash to the shareholder, not the futures holder, so the future shaves that expected payout out of its premium.

The working short-dated desk approximation is one line. Future minus Spot equals Spot times (interest rate minus dividend yield) times Days to expiry divided by 365. Treat it as a back-of-envelope tool, not a textbook law — for individual stocks the more honest version uses the actual rupee dividends expected before expiry rather than an annual yield, because dividends arrive in discrete lumps, not as a smooth stream.

Plug in real numbers on a Reliance one-month future. Spot is ₹2,840, the risk-free rate — the short-term interest rate a lender would accept on safe money, usually pegged to government Treasury bill yields — is around 6.5 per cent, no dividend is expected in the month, and there are 30 days to expiry.

The premium of ₹15 on the next-month future is roughly Spot times 6.5 per cent times 30 over 365, which lands at ₹15.18. The far-month future trades at twice that premium because it carries the share for twice as long.

That arithmetic is the whole reason for the upward slope. Each further-out contract carries the underlying for a longer period at the same interest rate, so each one is priced a little higher than the one before it.

Every arbitrage desk in Mumbai polices this gap — arbitrage simply meaning a low-risk trade that locks in the difference between two prices for the same thing. If the next-month future on Reliance prints at ₹2,860 instead of ₹2,855, the desk shorts the future, buys the cash, locks in the ₹5 spread, and closes the position at expiry. On liquid names like Reliance, Infosys and ICICI Bank, that policing tends to keep the basis close to fair value through the session, though the gap can widen briefly around the open, around major news, or on the last trading day of an expiry.

The full mechanics, including the textbook continuous-compounding version of the formula and the worked rupee numbers on one Reliance lot, sit in the longer guide on cost of carry in futures. Zerodha Varsity's chapter on futures pricing walks through the same parity argument with worked Indian examples.

When backwardation shows up in Indian markets

Most Indian equity futures spend the vast majority of their life in contango. The premium is small, positive, and almost invisible until you look for it.

Backwardation is the exception. When it appears, one of three things is usually true under the hood.

One. A heavy dividend is around the corner. ITC, Coal India, the public-sector banks, the IT majors at fiscal year end. These are the names where the annual or special dividend can be a meaningful slice of the share price.

The expected payout gets baked out of the next-month future weeks before the ex-date — the cut-off from which a new buyer no longer receives the upcoming dividend. On a share trading at ₹400 with a ₹12 dividend expected before expiry, that single payout is enough to drag the futures price several rupees below the cash. The curve flips, and the flip is mechanical, not a panic signal.

Two. The market is in a sharp bearish move. A panic open after a global sell-off, the budget-day disappointment, an ugly inflation print. Aggressive shorting flows into the most liquid futures because the leverage is cleanest there.

The basis on Nifty and Bank Nifty futures can turn negative for stretches at a time. During the March 2020 Covid sell-off, Business Standard reported the Nifty future trading at a discount to the cash on 3 March 2020, and again on 12 March 2020 as the index fell sharply and the volatility gauge spiked. That kind of backwardation is a sentiment signal, not a dividend artefact.

Three. A single name has stock-specific selling pressure. A promoter unwinding, an FPI (Foreign Portfolio Investor — global funds investing in Indian shares through the SEBI-registered route) exiting, or a domestic fund forced to liquidate quickly often dumps the position through the F&O (futures and options) market first.

The basis can collapse before the cash chart obviously breaks. A trader watching the curve, the open interest, and any disclosed block deals often spots the unwind a session or two ahead of a trader watching only the price.

None of these triggers are mysterious. The first sits on the NSE corporate actions calendar. The second is visible on any broad index chart. The third leaves a footprint in the F&O reports — bhavcopy, open interest, and participant-wise data — that the NSE publishes after market hours in its derivatives reports section.

One nuance on participant-wise data: the NSE publishes those open-interest totals by category — FII, DII, proprietary desks, retail — not by individual fund or name. So it is a supporting clue, not proof of a specific seller. Pair it with the stock's own open interest, the basis, the price action, and any block deal or corporate disclosure before drawing a conclusion.

What a beginner has to internalise is that backwardation is rarely random. The curve is telling you something. The job is to figure out which of the three things it is telling you, before placing a trade against it.

How traders read the shape of the curve

On a trading desk the basis is not used to forecast tomorrow's close. It is used as a thermometer.

The number that matters is the annualised cost of carry — the rupee basis re-expressed as a yearly percentage, so a five-day contract and a thirty-day contract are finally comparable. Annualised carry equals (Future minus Spot) divided by Spot, times 365 divided by Days to expiry, times 100.

That formula is what makes the number comparable across days, contracts and instruments. A ₹15 premium on a 30-day Reliance contract is roughly 6.4 per cent annualised. The same ₹15 on a five-day-to-expiry contract is closer to 38 per cent. Without the annualisation step, the two numbers are not even in the same units.

The other number worth defining once is open interest, often written OI. Open interest is simply the count of futures contracts still alive in the system — contracts that have been opened by some trader and not yet closed or settled. A rising OI means fresh positions are being added; a falling OI means existing positions are being closed out. The shape of the curve plus the direction of OI is most of what a desk reads.

The annualised carry on Nifty and Bank Nifty futures tends to sit somewhere near the short-term funding rate after expected dividends have been netted out, and it shifts with rates, expiry distance, and the dividend calendar — so any single fixed range is misleading. The honest version is to read the number that day, on that contract, not to memorise a target band.

Three patterns repeat often enough that every Indian equity-derivatives desk has them mapped.

Contango widening on rising open interest. The premium is expanding even as fresh long positions are being added. Aggressive buyers are happy to pay above fair value. The curve is telling you long conviction is building in the name.

Contango collapsing into backwardation on rising open interest. Fresh positions are being added on the short side, pushing the future toward and below the cash. The curve is telling you the fresh money has a bearish view, and the cash chart often follows in the days after — though never with the reliability of a forecast.

Basis stable while open interest falls. Both sides of the existing book are getting closed out. The basis is unchanged because nobody is pressing either way. The signal is consolidation, not direction.

None of these calls work in isolation. They earn their weight when they line up with the cash chart, the participant-wise F&O data, and what the broader index basis is saying. A single curve print in a single name is noise. A pattern across the top ten F&O names, day after day, is signal. The NSE publishes the underlying bhavcopy and participant-wise OI in the same derivatives reports section linked above, and most major brokerages compute and display the annualised basis from that data on their own terminals.

Three places where the curve quietly costs you

Beginners trade futures for the leverage. The shape of the curve is rarely on their checklist. That is exactly where the small leaks start.

One. Buying the future when the cash share would do. An investor who plans to hold Reliance for six months and chooses the next-month future instead of the cash share pays contango carry six times. At a 6 per cent annualised premium that is roughly 3 per cent of the position value over the period, just for the privilege of leverage a long-only investor does not need.

The future is a leveraged instrument. If the leverage is not being used, the contango premium is a tax paid for nothing.

Two. Shorting a stock the day before it goes ex-dividend, expecting a fall. A beginner sees ITC drop by ₹15 on the ex-date and thinks the chart is breaking down. The fall is the dividend coming out of the price, and the futures market has been quietly pricing it in for weeks via mild backwardation. Worth knowing: only the holder of the cash share on the record date gets the dividend cheque — the futures position does not, which is why the future is fair only after the expected payout has already been shaved out of its premium.

The position made the right call on the mechanics and the wrong call on the cause. The trade gets stopped out two sessions later when the price stabilises and someone else, who read the calendar, walks away with the dividend captured.

Three. Rolling a high-carry position three months in a row. A bullish thesis on a small-cap F&O name with a thin float and a steep contango, rolled across three expiries, can quietly pay away most of the upside in carry alone.

None of these are about getting the direction wrong. They are about the small operational decisions on top of a correct directional call. The curve is the part of the trade that compounds quietly, in either direction.