How Commodity Futures Work: Margin, Rolling and Commodity ETFs
Futures are how wheat, corn, copper and cattle are priced in the US, and they sit inside many commodity ETFs. This guide explains contracts, margin and daily settlement, why rolling can quietly erode returns, who regulates the market, and how commodity funds are structured and taxed.
Most commodities are priced in futures markets. The price of corn quoted at harvest, the copper price that signals industrial demand, and the cattle price ranchers watch all come from futures contracts traded largely on exchanges in Chicago and New York. Even investors who never trade a contract meet futures indirectly, because many commodity funds hold them. Knowing the mechanics explains both how prices form and why commodity funds often behave differently from the prices in the headlines.
What a futures contract is
A futures contract is a standardized agreement to buy or sell a set quantity of a commodity, of a set quality, at a set place, in a set future month, at a price agreed today. The exchange fixes everything except the price, which is why contracts are interchangeable and easy to trade.
Major US commodity futures are listed by CME Group, which includes the Chicago Board of Trade (grains and oilseeds), the Chicago Mercantile Exchange (livestock), NYMEX (energy) and COMEX (metals). ICE Futures U.S. lists "softs" such as coffee, sugar, cocoa and cotton.
| Sector | Examples | What drives prices |
|---|---|---|
| Energy | Crude oil, natural gas, gasoline, heating oil | Production, inventories, weather, geopolitics |
| Metals | Gold, silver, copper, platinum | Industrial demand, real interest rates, the dollar |
| Grains and oilseeds | Corn, wheat, soybeans | Weather, planting and harvest reports, exports |
| Livestock | Live cattle, lean hogs | Herd sizes, feed costs, consumer demand |
| Softs | Coffee, sugar, cocoa, cotton | Weather in growing regions, crop disease, currencies |
The US Department of Agriculture's crop reports, including its monthly supply and demand estimates, are among the most market-moving data releases for agricultural futures.
Who uses futures, and why
Futures exist first as a risk-management tool.
- Hedgers have real exposure to the commodity. A farmer can sell corn futures in spring to lock in a price for the autumn harvest. A food company can buy wheat futures to fix its flour costs. An airline can hedge jet fuel.
- Speculators have no physical exposure and take positions to profit from price changes. They take the other side of hedgers' trades and provide liquidity, which makes hedging cheaper.
Most futures positions never result in delivery. Traders close them before expiry, and many contracts are cash-settled.
Margin and daily settlement
Futures are traded on margin, but the word means something different from margin on stocks. It is not a loan. It is a performance deposit that guarantees you can cover losses.
- Initial margin is the deposit required to open a position, set by the exchange and often raised by brokers. It is typically a small fraction of the contract's full value, which is what makes futures leveraged.
- Daily mark-to-market. At the end of every trading day, the clearinghouse settles gains and losses in cash. Winners receive money; losers pay.
- Maintenance margin is the minimum balance. If losses take the account below it, the broker issues a margin call, and if it is not met, the broker can close the position.
Leverage cuts both ways. Because a small deposit controls a large position, a modest price move can wipe out the margin, and losses can exceed the initial deposit. The clearinghouse standing between buyers and sellers removes most counterparty risk, but not market risk.
Contango, backwardation and the cost of rolling
Because contracts expire, anyone who wants to stay exposed must roll: sell the expiring contract and buy a later one. The relationship between near and far prices determines what that costs.
- Contango: later contracts are priced higher than nearer ones, often because storage, insurance and financing cost money. Rolling means selling low and buying high, which creates a drag over time even if the spot price is flat.
- Backwardation: nearer contracts are priced higher, often when supply is tight right now. Rolling means selling high and buying lower, which can add to returns.
This "roll yield" is why long-run returns from holding commodity futures can differ sharply from the change in spot prices. A commodity can rise in price over several years while a fund holding its futures loses money, if the market spent that period in steep contango.
Commodity funds: what is inside the wrapper
Retail investors usually reach commodities through exchange-traded products. Structure matters.
- Physically backed funds hold the commodity itself in a vault. This works for precious metals but not for perishable or bulky commodities.
- Futures-based funds hold futures and roll them according to a published method. Some roll mechanically into the next month; others choose contracts further out or use rules designed to reduce contango costs.
- Commodity producer equity funds hold shares in mining, energy or agricultural companies. They behave like stocks, not like commodities.
Many futures-based funds are organized as commodity pools structured as limited partnerships. Their investors receive a Schedule K-1 rather than a Form 1099, which can complicate tax filing, and gains may be taxable each year even without a sale. Others are organized to issue a 1099 instead, often by holding futures through a subsidiary. The fund's prospectus and website state which form it issues.
Exchange-traded notes linked to commodity indexes are another variant. They are unsecured debt of the issuing bank, so they add the bank's credit risk.
Regulation and protections
US futures markets are overseen by the Commodity Futures Trading Commission (CFTC). The National Futures Association (NFA) is the industry's self-regulatory organization, and firms and individuals who handle customer futures business must be registered and NFA members. The NFA's BASIC database lets anyone check a firm's registration and disciplinary history.
Two differences from stock accounts stand out. Futures accounts are not covered by SIPC; customer funds are instead protected by segregation rules that require brokers to keep customer money separate from their own. And the CFTC and exchanges can set position limits on some contracts to deter manipulation.
How futures are taxed
Regulated futures contracts generally fall under Section 1256 of the tax code. Open positions are treated as sold at fair market value on the last business day of the year, and gains or losses are split 60% long-term and 40% short-term, regardless of holding period. They are reported on IRS Form 6781. For an active short-term trader, the blended rate can be lower than ordinary short-term rates. Funds structured as partnerships pass this treatment through on the K-1, while funds that hold physical metals follow different rules.
Before trading futures or commodity funds
Commodities can diversify a portfolio built on stocks and bonds, and they have tended to do relatively well in some inflationary periods. But they produce no earnings or interest, swing sharply on weather and politics, and in fund form can lose value to roll costs. Reading the contract specifications or the fund's roll method, understanding margin and leverage, and confirming registration with the NFA are the basic steps before taking a position.
This article explains how commodity futures markets work and is not investment or tax advice. Consider your own circumstances and consult a licensed professional before acting.
Frequently asked questions
Do futures traders have to take delivery of the commodity?
Most futures positions are closed or rolled before the delivery period, and many retail brokers require customers to exit before then. Some contracts are cash-settled and never involve delivery. Physical delivery is mainly used by commercial firms that actually produce or use the commodity.
Why does a commodity ETF not match the price I see in the news?
Headline prices usually refer to the nearest futures contract, while a fund holds a series of contracts and must sell expiring ones and buy later ones. When later contracts cost more, a condition called contango, that roll process drags on returns, so the fund can lag the headline price significantly over time.
How are futures taxed in the US?
Regulated futures contracts are generally Section 1256 contracts. Gains and losses are marked to market at year-end and treated as 60% long-term and 40% short-term regardless of how long the position was held, and they are reported on IRS Form 6781.
