Contango and backwardation explained

The curve as a news filter

When commodity markets move sharply, the front contract only tells half the story. The curve shows whether the stress sits in immediate delivery, further out in the season, or broadly across the whole market.

For a futures trader, this can change how you read the news. An oil price rising alongside strengthening backwardation often points to a tighter physical market. A price rally where the further-out contracts rise more can instead be more about expectations, financing or general inflation fears.

When the oil price is discussed in the news, it often sounds as if crude has a single price. In the futures market, there's simultaneously a price for delivery next month, another for delivery in six months, and further prices several years out. Lining these contracts up side by side gives us the futures curve - also called the term structure or forward curve.

The shape of the curve is a condensed picture of the market's balance between goods now and later. It can show what it costs to carry inventory, how valuable immediate access is, and how strongly producers and consumers want to hedge price. For a futures trader, the curve is therefore more than background material: it affects which contract should be traded, the price of calendar spreads, and what happens when a position has to be rolled.

What is a futures curve?

A futures curve shows the prices of several active contract months in the same market at one point in time. For WTI crude oil, a simplified example might look like this:

Here the price rises with time to maturity. The market is in contango. If October instead traded at $78, November at $77 and January at $75, the curve would be downward-sloping and the market would be in backwardation.

A real curve doesn't have to be smooth. It can be in backwardation at the front and contango further out, have seasonal peaks, or contain clear kinks around expected events. Natural gas, for example, can have higher winter contracts than the shoulder seasons without the whole market being simply labelled contango.

Contango: later delivery is priced higher

Contango typically describes an upward-sloping curve where further-out futures contracts are more expensive than nearer contracts. For storable commodities, this is often linked to cost of carry - the cost of buying the commodity now, financing the purchase, and storing and insuring it until delivery.

A simplified carry relationship can be written as:

F_0,T = S₀ · e^(r+u−y)T

where:

• F_0,T is the futures price for delivery at time T
• S₀ is today's spot price
• r is the financing rate
• u is storage, insurance and other carrying costs
• y is convenience yield - the non-cash benefit of owning the physical commodity

When interest rates and storage costs exceed the convenience yield, the theoretical futures price will normally sit above spot. In practice, prices are also affected by market friction, delivery location, commodity quality, credit, capacity and expected future balance.

Contango is therefore common when physical supply is ample, storage capacity is good, and there's limited need to secure immediate access. It doesn't mean the price necessarily has to rise. The curve can be upward-sloping even while both spot and futures prices are falling.

Backwardation: the commodity now is worth more than the commodity later

Backwardation normally describes a downward-sloping curve where near-term delivery is priced higher than later delivery. It often arises when the market values physical availability highly: inventories are low, demand is acute, or supply risk is high.

This benefit of holding the commodity in stock is called convenience yield. A refinery that owns crude oil can keep production running if a delivery falls through. A grain elevator can fulfil an immediate customer contract. The value is real, but it doesn't show up as an explicit interest payment on the account.

When convenience yield exceeds financing and storage cost, the futures price can sit below spot. Backwardation can therefore be a signal of scarcity at the front of the market. But here too the language matters: the curve shows relative prices now; it doesn't guarantee which way the spot price actually moves.

The futures price isn't the same as the expected spot price

One of the most common mistakes is saying that a December contract at $80 means the market "expects" a spot price of $80 in December. The futures price is the price that balances buyers and sellers today. It includes carry, risk premiums, hedging demand and scarcity value - not just a collective forecast.

It's also important to distinguish between:

• ordinary backwardation, which describes today's spot-futures relationship or a downward-sloping observed curve
• normal backwardation, which in Keynes's theory refers to the futures price sitting below the expected spot price at expiry because speculators demand a risk premium for being long against producers' hedging sales

The two can occur together, but they aren't the same thing by definition. Today's curve is observable. The expected future spot price is not.

Why spot and futures converge

At expiry, the futures price and the relevant spot or settlement price have to converge. If a large gap persisted in a deliverable market, qualified participants could in principle buy the cheap one and sell the expensive one, adjusted for costs and delivery rules.

Convergence doesn't mean, though, that the futures contract alone has to move toward today's spot price. Three paths are possible:

1. The futures price moves toward a relatively stable spot price.
2. The spot price moves toward the futures price.
3. Both move and meet at an entirely different level.

That's why it's wrong to treat contango as an automatic short and backwardation as an automatic long.

The main drivers behind the curve shape

Inventory levels

Storage is the buffer between production and consumption. High inventories reduce scarcity value and often favour contango. Low inventories increase the value of immediate delivery and can pull the front of the curve into backwardation.

The relationship isn't linear. The last available units can be far more valuable than earlier inventory reductions. At the same time, official inventory figures have to be read together with location and quality: oil in the wrong place, or metal that doesn't meet delivery requirements, doesn't necessarily resolve the scarcity in the futures contract.

Storage capacity

When physical storage space becomes tight, contango can become very steep. The market has to offer a bigger price gap before anyone is willing and able to store the commodity. If capacity is effectively full, simple cash-and-carry arbitrage works less well.

Interest rates and financing

Owning inventory ties up capital. Higher interest rates raise the carrying cost and, taken in isolation, pull the further-out contracts up relative to spot. The effect is clearest in commodities with low other costs and good storage options, but it can be overridden by physical scarcity.

Insurance, shrinkage and transport

Metals, grains and energy have different requirements for storage, quality and transport. Insurance, evaporation, quality deterioration, terminal fees and freight affect which spread can actually be arbitraged.

Convenience yield

Convenience yield tends to rise as inventories fall. It's high because a physical owner can meet unexpected demand, avoid a production stoppage, or deliver on short notice. It can't be bought directly by a pure futures investor.

Season

Natural gas, gasoline, heating oil and agricultural products have clear production or consumption seasons. A high winter price and a low summer price isn't necessarily a general bullish signal; it can be a normal seasonal premium.

Hedging pressure and risk premium

Producers sell futures to hedge income, while industrial buyers can buy futures to hedge costs. The imbalance between these groups and the capital on the opposite side can affect prices beyond pure storage economics.

How different markets are read

Crude oil

WTI and Brent can shift between contango and backwardation as inventories, OPEC+ policy, geopolitics and refinery demand change. Steep backwardation at the front is often associated with a tight physical market. Steep contango can signal a surplus and storage demand. Read more in our guide to oil futures.

Natural gas

The curve is heavily seasonal. A winter premium can reflect the risk of cold weather and limited withdrawal capacity. Compare the same delivery month across years, or use seasonally adjusted spreads, before drawing conclusions.

Gold

Gold is durable, relatively easy to store, and has large existing stockpiles. The curve therefore often sits in moderate contango driven by interest rates, financing and storage costs. A shortage in a specific deliverable form can still create local deviations.

Grains

Corn, wheat and soybeans follow crop cycles. Contracts around the old and new crop can be priced very differently. Weather, crop size, stocks-to-use ratios and quality can create both seasonal contango and sharp backwardation.

Calendar spreads: trading the curve

A calendar spread consists of opposite positions in two contract months in the same commodity. If you buy the near contract and sell the far contract, you're long the spread. The position is driven primarily by the change in the price difference - not just the commodity's absolute price.

Example:

• October oil: $75
• December oil: $77
• October-December spread: -$2

If October later rises to $78 and December to $79, the spread has become -$1. The long spread has strengthened even though both contracts rose. If both fall, but the front falls less, the spread can also strengthen.

Spread trading often carries lower absolute price risk than an outright futures position, but it isn't risk-free. Relative prices can move sharply, margin can increase, and each leg carries liquidity and execution risk.

The curve and rollover

A trader who wants to keep exposure beyond the contract's liquid life has to close the old contract and open a later one. In contango, the new long contract is normally bought at a higher price than the one sold. In backwardation, it's normally bought lower.

This leads to roll yield, but the curve shape and actual return need to be kept separate. Prices can change before the roll, and the roll method can select different contracts than the front month. See our practical guide to futures rollover and expiry.

How to read the curve in practice

A professional review can be done in six steps:

1. Get simultaneous prices for all liquid contract months.
2. Use the same point in time and the correct contract specification.
3. Calculate the calendar spreads, not just the price level.
4. Annualise the spread when comparing markets with different maturities.
5. Compare the shape with storage, season and delivery rules.
6. Follow how the curve changes over time - a single snapshot isn't enough.

A simple annualised front spread can be expressed as:

Annualised spread ≈ (far contract − near contract) / near contract × 365 / days between contracts

This is a comparison measure, not a guaranteed return. It ignores transaction costs, margin, the exact delivery period and price changes before the roll, among other things.

Common misconceptions

"Contango means the market thinks the price is going up." Not necessarily; carry can explain all or part of the slope. "Backwardation is always bullish." It can signal scarcity now, while the market still prices lower later. "The curve has to move toward today's spot." Spot and futures can both change before convergence. "Backwardation guarantees positive roll yield." Only under specific exposures and price paths. "All contracts on the curve are equally liquid." Volume and spread can drop quickly in the far months. "The oil price" is a single price. The delivery month and reference point are part of the price.

Conclusion

Contango and backwardation are the market's pricing of time. The curve ties together physical supply, storage, financing, season, hedging demand and risk. It can offer valuable information about where the scarcity sits, but it's neither a pure forecast nor a ready-made trading signal.

First understand which market and which delivery month you're analysing. Then separate curve shape from expected spot price, and curve shape from actual roll yield. That precision is what makes the futures curve useful - for outright futures, calendar spreads, and commodity products that roll contracts alike.

Sources and further reading

• CME Group: What is Contango and Backwardation?
• Gorton and Rouwenhorst: Facts and Fantasies about Commodity Futures
• Gorton, Hayashi and Rouwenhorst: The Fundamentals of Commodity Futures Returns
• CFTC: Futures Market Basics

Capital risk: Futures trading carries a high level of risk and isn't suitable for everyone. Losses can exceed capital deposited. This article is general information, not investment advice.

Frequently asked questions about contango and backwardation

Short answers about futures curves, contango, backwardation, convenience yield, carry and practical interpretation.