Futures explained: how futures contracts work and why they matter for commodity and currency exposure

Futures contracts are standardised agreements to buy or sell a specific asset at a predetermined price on a specified future date. They are the primary instrument through which investors gain commodity and currency exposure in a systematic portfolio, and they introduce mechanics—expiry, roll, and margin—that have no equivalent in equity or ETF investing. Understanding how these mechanics affect returns is essential before including futures in a portfolio.

What a futures contract is

A futures contract specifies the underlying asset (gold, crude oil, a currency pair, a government bond), the quantity, the delivery date, and the price agreed at the time of the contract. Both parties—the buyer and the seller—are obligated to fulfil the contract at expiry: the buyer to purchase at the agreed price, the seller to deliver at that price. In practice, most futures positions are closed or rolled before physical delivery occurs. Futures are traded on regulated exchanges, including the CME Group, ICE, and Eurex, with standardised contract specifications that ensure market liquidity and price transparency.

Margin is the defining operational feature of futures trading. Rather than paying the full contract value upfront, a futures trader posts an initial margin—a fraction of the total notional exposure—as collateral. This provides inherent leverage: a position with a notional value of USD 100,000 might require initial margin of USD 5,000–10,000. The margin requirement is marked to market daily: if the position moves against the trader, variation margin must be posted to maintain the position; if it moves in the trader's favour, excess margin can be withdrawn. This daily settlement mechanism means losses must be funded continuously rather than absorbed at position close.

Which asset classes futures represent

The asset class exposure of a futures contract depends on its underlying. Commodity futures—gold, crude oil, natural gas, agricultural commodities—provide commodity asset class exposure. Currency futures—EUR/USD, GBP/USD, USD/JPY—provide currency asset class exposure. Government bond futures provide fixed income exposure. Equity index futures provide equity exposure. Futures are particularly important for commodity and currency exposure at the retail level, where holding the underlying physical asset is either impractical (barrels of crude oil) or inefficient (physical gold storage).

For commodity investors in particular, futures are often the only practical instrument for gaining direct price exposure. Commodity ETFs that hold physical metals (gold, silver) are an exception, but for most commodities—energy, agricultural goods—the only investable instrument is a futures contract or a futures-based ETF. Understanding the futures mechanics is therefore not optional for investors seeking commodity exposure: whether they access it directly or through an ETF, the underlying return drivers include roll yield and contango effects.

Key considerations for portfolio use

Expiry and roll management are the most important operational considerations in futures investing. A futures contract expires on a specified date. An investor holding a futures position beyond that date must roll the position—closing the expiring contract and opening an equivalent position in the next available expiry. The cost of this roll depends on the shape of the futures curve. When the curve is in contango (futures prices exceed spot prices), rolling forward means selling a lower-priced contract and buying a higher-priced one—a persistent cost. When the curve is in backwardation (futures prices are below spot), rolling forward generates a gain. Over time, roll yield—positive or negative—is a material component of the total return from a futures position.

Margin requirements and leverage add operational complexity. A futures portfolio must maintain sufficient margin to withstand adverse price movements without being forced to close positions at unfavourable prices. Systematic strategies using futures must account for margin in their position sizing and cash management. Leverage that appears attractive in favourable conditions can force involuntary deleveraging in stressed conditions—a risk that equity or ETF portfolios do not face in the same way.

Futures in pfolio

In pfolio, futures are tagged with the Future asset type and their corresponding asset class—a gold futures contract carries the Commodity asset class tag; a EUR/USD futures contract carries the Currency tag. A key feature of pfolio for futures-based systematic strategies is the continuous futures chain builder. Because individual futures contracts expire, each expiry creates a discontinuity in the price history—a gap that makes long-term backtesting unreliable. The continuous chain builder stitches consecutive contracts into a single, unbroken price series by applying configurable roll rules: the roll date (how many days before expiry to initiate the roll), the roll cost method, and other construction parameters. This allows futures to be analysed and backtested over extended periods on the same basis as non-expiring instruments, which is essential for systematic strategy development. Futures instruments are visible on the Assets page, and futures-based portfolios are analysed in pfolio Insights.

Limitations

The roll mechanics of futures introduce a return component that does not exist in direct asset ownership. In contango markets, the roll cost is a persistent drag: an investor who holds a long crude oil futures position continuously over several years in a contango environment may find that spot oil prices have risen while their futures-based return is flat or negative, due to accumulated roll costs. This divergence between spot price and futures-based return is a structural feature of futures investing, not an anomaly.

Margin and leverage add operational complexity and risk that equity or ETF portfolios do not face. A portfolio using leveraged futures positions must manage margin continuously; forced deleveraging in stressed conditions can crystallise losses at the worst possible moment. The complexity of expiry and roll management also creates operational overhead—for investors or systematic strategies managing multiple futures positions across different expiry cycles, the logistics of rolling positions on schedule is a non-trivial requirement. Finally, liquidity in specific futures contracts can vary significantly: the most active contracts for major commodities and currencies are among the most liquid instruments in any market, but less actively traded contracts may have wider spreads and limited depth.

Related articles

• Asset types explained: how ETFs, stocks, futures, and currencies differ as investment instruments
• Commodity investing explained: gold, oil, and real assets in a portfolio
• Currency investing explained: how FX exposure affects portfolio returns
• Drawdown explained: measuring and understanding portfolio losses