Contango and backwardation: how the shape of the futures curve affects long-term returns
A commodity ETF that tracks oil is not the same as buying oil. If the futures market is in contango—where futures prices exceed the spot price—investors holding the ETF lose money from rolling contracts, even if oil's spot price stays flat or rises. Contango and backwardation are the two fundamental states of the futures curve, and they determine whether holding a long futures position currently costs or earns money, independent of what the underlying price does.
What contango is
Contango describes a futures market where contracts with later expiry dates are priced higher than those with earlier expiry dates. The front-month contract is cheaper than the second-month, which is cheaper than the third, and so on. The term structure slopes upward.
Economically, contango reflects the cost of carrying a position in the underlying asset through time. For financial instruments—equity index futures, Treasury bond futures—the driver is the net cost of carry: what you pay in interest to finance a leveraged position, less what you receive in dividends or coupon income. For commodity futures, the primary driver is storage cost. Storing crude oil requires tanks, insurance, and financing—costs that must be reflected in the forward price if producers and merchants are to bear them. When storage is plentiful and cheap, contango tends to be modest. When storage is tight or financing costs are high, the curve steepens.
What backwardation is
Backwardation is the opposite state: the front-month contract is more expensive than later expiries. The term structure slopes downward. Backwardation occurs when the near-term demand for a commodity—or the benefit of physically possessing it now—exceeds what future supply expectations imply. This benefit, the convenience yield, is the economic value of having the commodity available immediately. It is high when inventories are low, supply is disrupted, or seasonal demand peaks. During a cold winter when natural gas inventories are depleted, spot gas commands a significant premium over gas for spring delivery. That premium is backwardation.
Equity index futures are structurally in contango in most interest-rate environments because interest rates typically exceed dividend yields. Commodity markets cycle between the two states depending on supply-demand conditions and seasonal patterns.
How they affect returns
For a long futures position maintained through rolling, the term structure state directly determines the roll yield—the return earned or lost at each roll.
In contango. The roll costs money. You sell the expiring (lower-priced) contract and buy the next (higher-priced) one. In backwardation. The roll earns money. You sell the expiring (higher-priced) contract and buys the next (lower-priced) one.
The canonical illustration is crude oil in the years following the 2008–2009 financial crisis. WTI crude spot prices rose from approximately USD 34 per barrel in early 2009 to over USD 110 by early 2011—a gain of more than 200% in spot-price terms. Yet the United States Oil Fund (USO), a long-only front-month crude oil futures ETF, returned approximately 15–20% over the same period. The crude oil futures market was in persistent, steep contango throughout, meaning every monthly roll transferred wealth from long holders to short sellers. The roll cost eroded the overwhelming majority of the spot-price gain.
Gorton & Rouwenhorst (2006), Facts and Fantasies About Commodity Futures, Financial Analysts Journal, found—analysing commodity futures returns over 1959–2004—that contracts in backwardation earned an average annualised roll yield of approximately 5% while contracts in contango earned approximately −5%: a spread of roughly ten percentage points per year from this single structural characteristic alone.
Limitations
Contango and backwardation describe the current state of the term structure—they say nothing about future price direction. A market can be in deep contango and still have rising spot prices; the question is only whether the spot-price gains will exceed the roll losses. Similarly, backwardation does not guarantee positive total returns: if the spot price falls faster than the roll yield is positive, the total return is negative.
The term structure state changes continuously. Positions taken when a market is in backwardation can find themselves in contango within weeks if supply conditions change. Systematic strategies that attempt to exploit roll yield by targeting backwardated contracts must account for this state-change risk.
Roll yield is one of three components of total futures return, alongside spot return and collateral yield (the return on cash posted as margin). Focusing solely on term structure state without considering the other two components can give a misleading picture of expected total return.
Contango and backwardation in pfolio
pfolio's continuous futures chain builder embeds actual roll prices into constructed price series, so contango drag and backwardation carry are captured in backtested performance metrics. A strategy that held crude oil futures through a period of persistent contango will show that roll cost in its historical returns—not as a separate line item, but as part of the actual return series. This makes performance comparisons between different futures markets honest: two strategies with similar spot-price exposures but different term structure characteristics will show different historical returns, as they would in reality. The live term structure chart for each instrument is available in the platform's instrument analytics view.
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