Futures Curve: Contango and Backwardation Explained

A futures curve plots the price of a commodity's contracts across expiration months. Its shape — contango or backwardation — is not a forecast. It is a snapshot of storage costs, interest rates, and supply/demand balance, and it creates a hidden return called roll yield that dominates long-run commodity returns.

Contango (upward sloping)

Later contracts trade higher than near contracts. Normal for storable commodities: the later price equals spot plus storage, insurance, and financing costs.

• Roll yield is negative. A long-only holder sells the expiring contract and buys the next one at a higher price, paying the spread each roll. This is the contango drag.
• Where it bites hardest: VIX futures in calm markets (the VIX futures curve is almost always in contango, eroding long-VIX ETFs like VXX by 5–15% per month in low-vol regimes), and oil in oversupply.

Backwardation (downward sloping)

Near contracts trade higher than later contracts. Signals scarcity — buyers will pay a premium for immediate delivery.

• Roll yield is positive. A long holder rolls from the expensive near contract into the cheaper next one, capturing the spread. Backwardation is why long-only commodity exposure can outperform spot.
• Where it appears: oil in supply shocks, grains after crop failures, and any market where physical demand exceeds immediate supply.

The roll-yield math

If front-month crude is $80 and the next month is $82 (contango, +2.5% monthly), a long holder loses ~2.5% per roll just from the curve, before spot moves. Over a year of rolls that compounds severely. Conversely, in backwardation ($82 front, $80 next), the long holder gains ~2.5% per roll.

How to trade it

• Never hold long-only commodity or VIX ETFs in persistent contango unless you have a strong directional view that exceeds the roll drag. The structure leaks capital monthly.
• Curve-aware entries: for long commodity exposure, prefer periods of backwardation — the roll yield adds to your return. In contango, demand a strong spot catalyst or stand aside.
• Calendar spreads: trade the shape directly. Long front / short back in backwardation (betting the scarcity tightens); long back / short front in contango (betting the curve flattens as supply eases). Defined risk, no spot exposure.
• Roll-down trades: in steep backwardation, buying the front and letting it roll down the curve toward the back captures roll yield if the curve holds.

The key takeaway

Spot price gets the headlines; roll yield drives the returns. A commodity ETF in steep contango can lose money over a year even when spot is flat. Before any commodity or volatility position, look at the curve shape — it tells you whether the structure is paying you or taxing you to hold it.