Commodity roll return: how futures curve shape drives long-run commodity returns

Commodity roll return—also called roll yield—is the return generated from rolling a futures contract from one expiry to the next. It is distinct from the spot price return (the change in the commodity's current market price) and represents the largest and most variable component of long-run commodity futures returns. Investors who focus on commodity spot price charts without understanding roll return will systematically misestimate the return from holding commodity futures or commodity ETFs, often significantly.

What roll return is

A commodity futures contract has a fixed expiry date. As the expiry approaches, a long-only commodity investor who wants to maintain exposure must sell the expiring contract and buy the next-expiring contract—this is the roll. The roll return is the profit or loss from this transaction, and it depends entirely on the shape of the futures curve at the time of the roll.

When the futures curve is in backwardation—near-term contracts priced above far-term contracts—the roll generates positive return. The investor sells the near-term contract (at a higher price) and buys the next contract (at a lower price). This price differential converts into a positive return as time passes and the next contract itself approaches expiry. Conversely, when the curve is in contango—near-term contracts priced below far-term contracts—the roll generates negative return. The investor sells the expiring contract at a lower price than the next contract they must buy, paying the price differential as a carrying cost.

How it works in practice

Consider a crude oil investor holding a one-month futures contract. If the contract is priced at USD 80 per barrel and the next month's contract is priced at USD 82, the curve is in contango by USD 2. When the near-term contract expires, the investor rolls by selling at USD 80 and buying at USD 82—immediately losing USD 2 per barrel from the roll, regardless of where the spot price goes. If this contango persists, the investor pays USD 2 per month (approximately 2.5% per month) simply to maintain the position. Over a year of persistent contango at this rate, the roll cost would amount to roughly 30%—a significant drag on any spot price appreciation.

Gorton and Rouwenhorst (2006) decomposed commodity futures returns into three components: spot price return, roll return, and collateral return (the return on the Treasury bills posted as margin). Their analysis of 36 commodity futures over 1959–2004 found that the average annualised roll return was approximately 3.5% per year—comparable to the average spot price return—making roll return a major and often dominant component of total commodity futures returns. Crucially, the sign of the roll return varied significantly across commodities and over time.

Structural patterns across commodity markets

Different commodity markets have different structural tendencies for their futures curves. Energy commodities—particularly crude oil and natural gas—frequently trade in contango during periods of ample supply, because storage costs and financing charges push deferred prices above spot prices. This creates a persistent roll cost headwind for long-only energy investors in supply-abundant environments. Agricultural commodities and some metals tend to alternate between contango and backwardation more readily, as their convenience yields—the economic benefit of holding physical inventory to meet production needs—fluctuate with seasonal demand patterns and supply disruptions.

Precious metals (gold, silver) are typically in slight contango because storage costs are low and there is no significant convenience yield—gold and silver are not consumed in production processes where stockouts would be costly. The contango in gold is approximately equal to the risk-free rate minus storage and insurance costs, making it persistent but modest. For gold investors, the roll cost is small enough that it does not substantially affect the total return case, unlike energy commodities in pronounced contango.

Limitations and trade-offs

Roll return is forward-looking and unpredictable. The current shape of the futures curve is observable; what the curve will look like at the time of the next roll is not. A market in backwardation today may be in contango in three months if supply conditions change. Commodity roll return is therefore both large in magnitude and highly variable in sign, making it a significant source of uncertainty for commodity investors.

Commodity ETFs that hold futures contracts rather than physical commodities are directly exposed to roll return dynamics. An ETF tracking a broad commodity index will roll contracts according to its index methodology, and the roll return will contribute positively or negatively to the ETF's total return relative to its underlying spot price index. Investors comparing a commodity ETF's performance to a spot price chart must adjust for both the roll return and the collateral return to make an accurate comparison.

Commodity roll return in pfolio

Roll return is a fundamental consideration in pfolio's commodity exposure. Commodity futures are accessible in pfolio both directly and through commodity ETFs, and pfolio's selection process evaluates the carry component—which includes roll yield—alongside momentum when assessing commodity positions. The cross-reference articles contango and backwardation and futures term structure provide the underlying mechanics. Commodity performance is tracked in pfolio Insights.

Related articles

• Contango and backwardation: how the shape of the futures curve affects long-term returns
• Futures term structure: what the price curve across expiries reveals
• Commodity investing explained: gold, oil, and real assets in a portfolio
• Carry strategies in investing: earning the spread across currencies, bonds, and commodities