Futures Contracts Explained: Mechanics, Margin, and Risk

The Contract That Nearly Bankrupted a Trading Desk

In April 2020, the price of WTI crude oil futures briefly fell to negative $37.63 per barrel—the first time in history any commodity traded at a negative price. Traders holding long contracts had to pay someone to take oil off their hands because Cushing, Oklahoma storage was completely full. That single trading session wiped out hundreds of millions of dollars in accounts that didn't understand delivery mechanics. Futures contracts are precise legal instruments, and every clause matters.

The Basic Structure of a Futures Contract

A futures contract is a standardized legal agreement between two parties: one agrees to buy, the other to sell, a specific quantity of an asset at a specified price on a specified future date. The buyer is "long." The seller is "short." Neither needs to own the underlying asset at contract inception.

Key components of every futures contract include:

• Underlying asset: The commodity or financial instrument (crude oil, corn, S&P 500 index, U.S. Treasury bonds)
• Contract size: The standardized quantity (1,000 barrels of oil; 5,000 bushels of corn; $250 × S&P 500 index value)
• Delivery date: The month when settlement occurs (March, June, September, December are common)
• Delivery method: Physical delivery or cash settlement
• Tick size: The minimum price movement and its dollar value

Margin: The Engine of Leverage

Futures require only a fraction of the contract's full value as a deposit—called margin. This creates leverage that amplifies both gains and losses.

Two types of margin apply. Initial margin is the deposit required to open a position. Maintenance margin is the minimum balance required to keep the position open—typically 75%–80% of initial margin. When account equity falls below maintenance margin, a margin call requires the trader to deposit additional funds or have the position liquidated.

Mark-to-Market: Daily Settlement

Unlike stocks, futures positions are settled daily. At the end of each trading session, the clearinghouse calculates each contract's gain or loss based on the settlement price and credits or debits accounts accordingly. This process is called mark-to-market.

Example: A trader buys one E-mini S&P 500 contract at 5,200. The contract multiplier is $50, so total contract value is $260,000. If the index closes at 5,220, the long position gained 20 points × $50 = $1,000, credited immediately. If it falls to 5,180, the account loses $1,000.

Physical Delivery vs. Cash Settlement

Most speculators and retail traders never want physical delivery. They close positions by taking the opposite trade before the contract expires—buying back shorts or selling out longs. Failing to do so with physically settled contracts results in obligations to receive (or deliver) actual barrels, bushels, or ounces.

Rolling Contracts Forward

Active traders who want continuous exposure roll their positions by closing the expiring contract and opening the next month's contract. This is called a roll. ETFs that hold futures—like the United States Oil Fund (USO)—do this mechanically, which is why they can diverge significantly from spot prices over time due to contango roll costs.

Who Uses Futures Markets and Why

• Airlines: Southwest Airlines famously hedged jet fuel prices using futures, saving billions during the 2000s oil spike
• Farmers: Corn and wheat producers sell futures at planting time to lock in revenue regardless of harvest-time prices
• Portfolio managers: Futures on stock indexes allow rapid hedging of equity exposure without selling individual shares
• Currency traders: CME FX futures allow hedging against exchange rate moves in 49 currency pairs

Risk Management Essentials

High leverage means small market moves create large dollar swings. A 1% move in a crude oil futures position can mean a 13% gain or loss on margin. Professional traders use stop-loss orders, position sizing rules, and diversification across uncorrelated contracts to manage this risk. Retail traders who treat futures like lottery tickets routinely lose their entire margin balance in days.

The CME Group's educational platform, CME Institute, offers free courses on futures mechanics, margin, and risk management—worthwhile before opening a futures account.

Disclaimer: Futures trading involves substantial risk of loss and is not appropriate for all investors. Leveraged instruments can result in losses exceeding initial deposits. This article is for informational purposes only. Consult a qualified financial advisor before trading futures.