Futures Contracts: Definition, Types, Mechanics, and Trading Use

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A futures contract is a standardized, exchange-traded agreement that obligates the buyer to purchase, and the seller to deliver, a set quantity of an underlying asset at a price agreed today, on a specified future date. The underlying can be a physical commodity such as crude oil or wheat, or a financial instrument such as a stock index, a government bond or a currency. Both sides are bound: the buyer (the “long”) must take the asset at the contract price, and the seller (the “short”) must supply it, whatever the market price is at expiration. Because its value comes from the price of something else, a futures contract is a derivative.

What a futures contract specifies

What separates a futures contract from a private agreement is standardization. The exchange publishes a contract specification that every participant trades under. A typical specification covers:

1. Underlying asset and grade: for commodities, the quality that qualifies for delivery.
2. Contract size: the quantity one contract represents. One crude oil contract on the Chicago Mercantile Exchange (CME), for example, covers 1,000 barrels.
3. Price quotation and tick size: how the price is expressed and the smallest allowed price change.
4. Delivery months: the calendar months in which contracts expire.
5. Last trading day and expiration: many contracts expire on or around the third Friday of the month, but this varies by product.
6. Settlement method: cash settlement or physical delivery, and for delivery contracts, the approved locations.

Because every contract with the same symbol and month is identical, one trader’s long position can be closed by selling to anyone in the market. That fungibility is what makes futures liquid and what lets a position be exited long before the delivery date.

How futures contracts work

The clearinghouse

When two traders agree on a trade, the exchange’s clearinghouse steps in as the counterparty to both. The buyer’s contract is effectively with the clearinghouse, and so is the seller’s. Neither side needs to know or trust the other. The clearinghouse protects itself by requiring margin from every participant and by settling profits and losses daily.

Margin and daily settlement

Futures margin is not a down payment on the asset and not a loan. It is a performance bond, a deposit that shows you can cover losses. Three terms matter:

• Initial margin: the amount required to open a position, set by the exchange (brokers may require more).
• Maintenance margin: a lower threshold. If account equity falls below it, the broker issues a margin call.
• Variation margin: the daily cash flows that move gains into, and losses out of, the account.

At the end of each trading day, every open position is marked to market at the official settlement price. If the price rose, longs are credited and shorts debited by the change; if it fell, the reverse. A margin call requires a deposit that brings the account back up to the initial margin level, not merely to maintenance. If the money is not deposited, the broker can close the position.

Worked example: a long crude oil position

Hypothetical figures for illustration only. A trader buys one crude oil futures contract (1,000 barrels) at $70.00 per barrel. Assume initial margin of $6,000 and maintenance margin of $5,000. The trader deposits $6,000.

After day 3, equity of $4,600 is below the $5,000 maintenance level. The trader must deposit $1,400 to restore the $6,000 initial margin. If the trader then sells at $72.00, the total profit is ($72.00 - $70.00) × 1,000 = $2,000, but along the way the position required extra cash. A contract representing $70,000 of oil was controlled with a few thousand dollars, which is why a $1 move changes equity by $1,000.

Interpreting a futures position

The profit or loss on any futures position follows one formula:

P&L = (exit price - entry price) × contract multiplier × number of contracts

For a short position the sign is reversed. The payoff is linear: each one-unit move in the futures price changes the P&L by the same amount. A long can lose down to the price reaching zero; a short’s potential loss has no fixed ceiling. The payoff diagram is a straight line through the entry price, unlike the kinked payoff of an option.

How futures prices are set

A futures price is set by trading, but arbitrage ties it closely to the spot price through the cost of carry: interest, storage costs, and any income or benefit from holding the asset.

For a commodity, the standard model is:

F = S × e^((r + u - y) × T)

where F is the futures price, S the spot price, r the risk-free rate, u the storage cost as a rate, y the convenience yield (the benefit of having the physical good on hand), and T the time to expiration in years. For a stock index, the dividend yield q replaces storage and convenience yield: F = S × e^((r - q) × T). A dividend yield lowers the futures price relative to spot, because the holder of futures does not receive the dividends.

Hypothetical example: an index at 5,000, a 5% risk-free rate, a 1.5% dividend yield and six months to expiration gives F = 5,000 × e^(0.035 × 0.5) ≈ 5,088.

For currency futures, the carry is the interest rate differential between the two currencies, which is covered interest rate parity:

F = S × e^((r_domestic - r_foreign) × T)

Hypothetical example: EUR/USD spot at 1.1000, a 4% dollar rate, a 2% euro rate and six months to expiry gives F = 1.1000 × e^(0.01) ≈ 1.1111. The currency with the higher interest rate trades at a forward discount, which is why a futures quote on a currency pair differs from its spot rate even when nobody expects the rate to move.

Two related terms describe the relationship across time:

• Basis is the difference between the spot price and the futures price. It narrows toward zero as expiration approaches, because at delivery the futures and the asset are the same thing.
• Term structure is the curve of futures prices across expiration months. When later months trade above nearer ones, the market is in contango; when they trade below, it is in backwardation. Contango is consistent with carrying costs; backwardation often reflects a high convenience yield, when holding the physical good now is valued.

Who uses futures contracts

Hedgers

Hedgers have exposure to the price of an asset through their business and use futures to reduce it. An oil producer expecting to sell oil next year can sell futures to fix the price it will receive. A manufacturer that consumes oil every month can buy futures to fix its cost.

Hypothetical example: a producer expects to have one million barrels ready in 12 months. Spot oil is $75 and the one-year futures price is $78. Selling 1,000 contracts locks in roughly $78 million. If spot falls to $65, the producer sells its oil for less but gains about $13 per barrel on the short futures. If spot rises to $90, the physical sale earns more and the futures lose about $12 per barrel. Either way, the combined result stays near $78: the hedge removes the downside and gives up the upside.

In practice hedges are rarely perfect. The producer’s oil may differ in grade or location from the contract’s deliverable, and its quantity may not divide evenly into contracts. The remaining mismatch is called basis risk.

Speculators

Speculators have no business need for the underlying asset. They take positions to profit from price changes, for example buying grain futures in the expectation that prices rise before delivery. They supply much of the liquidity hedgers rely on by taking the other side of hedgers’ trades.

Arbitrageurs

Arbitrageurs trade futures against the underlying asset or against related contracts to capture temporary mispricings. If a futures price drifts far above its cost-of-carry value, an arbitrageur can buy the asset, sell the futures and earn the gap. This activity is what keeps futures prices anchored to the formulas above.

Types of futures contracts

Futures can be listed on almost any asset with a large enough market. The main families are:

• Agricultural futures: grains such as corn, wheat and soybeans; softs such as coffee, sugar and cotton; lumber, milk and livestock.
• Energy futures: crude oil, natural gas, gasoline and heating oil.
• Metal futures: precious metals such as gold and silver, and industrial metals such as copper and steel.
• Currency futures: contracts on exchange rates between national currencies, priced off spot and interest rate differentials.
• Interest rate and bond futures: contracts on short-term rates and on government debt, such as U.S. Treasury bonds and German BOBL notes.
• Stock index futures: contracts on indexes such as the S&P 500 and the Nasdaq-100, which are cash-settled.

Many exchanges also list smaller “mini” and “micro” versions of popular contracts, which cut the contract size and therefore the dollar value of each price move.

What happens when a futures contract expires

A trader who still holds a position after the last trading day must settle it according to the contract specification.

• Cash-settled contracts, such as stock index futures, are closed at a final settlement price. The account is credited or debited the difference, and no asset changes hands.
• Physically delivered contracts require the short to deliver and the long to accept the actual commodity or security at an approved location. The long becomes responsible for transport, storage, handling and insurance.

Retail traders and most portfolio managers have no use for 1,000 barrels of oil, so they close positions before expiration or roll them: selling the expiring month and buying a later one in the same order. In a contango market, each roll sells a cheaper near contract and buys a more expensive later one, which can drag on long-term returns even when spot prices are flat. Brokers serving individual traders typically require clients to exit delivery contracts before the delivery period and may close positions themselves if the client does not.

Futures vs. forwards, options and spot trading

Futures vs. forward contracts. A forward is also an agreement to exchange an asset at a set price on a future date, and both can be used to hedge or speculate. The differences lie in structure:

A forward can be tailored to an exact quantity and date, which is why companies hedging a specific foreign-currency payment often use forwards. Futures give up that flexibility in exchange for liquidity and the clearinghouse guarantee.

Futures vs. options. A futures contract is an obligation for both sides. An option gives the buyer the right, but not the obligation, to buy or sell at a strike price in exchange for a premium, so the buyer’s loss is limited to the premium while a futures position can lose much more than the initial margin. A put option can set a price floor much like a short futures hedge while keeping the upside, at the cost of the premium. Options on futures also exist.

Futures vs. spot trading. A spot trade exchanges the asset now at the current price. A futures trade fixes a price for later, and its price differs from spot by the cost of carry. In foreign exchange, a spot forex position held overnight is typically adjusted through swap or rollover charges, while a currency futures contract builds the interest rate differential into its price and has a fixed expiry.

Limitations and risks of futures contracts

• Leverage cuts both ways. Margin is a small fraction of contract value, so modest price moves produce large gains or losses relative to the deposit. Losses can exceed the money in the account.
• Daily cash demands. Because positions are marked to market every day, a hedge that will work out at expiration can still require large margin payments in the meantime. A hedger needs cash reserves, not just a correct view.
• Fixed contract sizes. Exposure comes in whole contracts, so matching an exact quantity may be impossible and leaves part of the position unhedged or overhedged.
• Price limits and gaps. Some contracts have daily price limits that can halt trading, and prices can gap between sessions, so a stop order may fill far from its trigger price.

Sizing a position by the dollar value of one tick and the maximum loss you accept, rather than by the margin required, keeps leverage within a planned limit.

How to trade futures

In the United States, futures markets are regulated by the Commodity Futures Trading Commission (CFTC). Futures brokers register with the CFTC and are members of the National Futures Association.

The practical steps are:

1. Open a futures-enabled account. Brokers require a margin account and separate futures approval, usually based on experience, finances and risk disclosures.
2. Read the contract specification. Contract size, tick value, trading hours, last trading day and settlement method determine what one trade risks.
3. Fund the account above the initial margin, leaving room for adverse daily moves.
4. Place the order for the chosen month: buy to go long, sell to go short. Shorting futures requires no borrowing of the asset.
5. Monitor margin daily and decide in advance whether to close or roll before expiration.

Major U.S. venues include CME Group’s exchanges, ICE Futures U.S. and the Cboe Futures Exchange (CFE).

FAQs

The Bottom Line

Futures suit hedgers who want to fix a future price and traders who want leveraged, liquid exposure to commodities, currencies, rates or indexes. The same leverage can produce losses larger than the deposit, and daily settlement demands cash even when a position later works out. Read the contract specification, size positions by tick value and maximum acceptable loss, and plan to close or roll before expiration.