Futures Margin Explained: Initial, Maintenance and Real Risk

Margin in futures is not what it is in stocks, and confusing the two leads to positions much larger than intended. In stocks, margin generally means borrowing from your broker. In futures, margin is a good-faith deposit held against a contract, and it says nothing about how much you can lose.

What margin is

When you buy or sell a futures contract you post a deposit that is a fraction of the contract's notional value. Notional value is the index level times the point value. At a hypothetical S&P 500 level of 5,000, one ES contract has about $250,000 of exposure ($50 per point). The margin required to hold it is a small portion of that, which is what creates leverage. A 10-point move against one ES contract is $500, whether your margin is a few hundred dollars or many thousands.

Initial and maintenance margin

Initial margin is what an account needs to open or hold a position. Maintenance margin is the lower balance the account must stay above while the position is open. Exchange margins are set by the exchange clearing house, and brokers can require more. Both change with volatility, and they often rise around turbulent markets, which is why I will not print a table of numbers here. A figure from an article is stale quickly.

To find current numbers, check the CME Group margin page for the exact contract, then your broker's margin schedule, since your broker's number is the one that governs your account. Also check whether it differs for overnight versus intraday, and for standard versus micro contracts.

A hypothetical maintenance example

Suppose a broker requires $12,000 initial and $10,800 maintenance for one ES, and your account holds $12,000. Price moves 24 points against you, a $1,200 loss, taking the account to $10,800. At that point you are at the maintenance level. A further loss puts you under it. The exact numbers are made up, and real requirements will differ, but the mechanism is the same.

Intraday margin

Many futures brokers advertise a reduced intraday margin for positions closed before a cutoff. The amount is set by each broker and can differ between brokers and account types. Lower margin means you can hold a contract with less cash, but it does not reduce the points you can lose. It can also push you into positions that are large relative to your account. My own view is that the overnight requirement is a useful sanity check for whether an account is capitalized for a contract, since a stop that fills badly does not care what the intraday margin was.

Margin calls and liquidation

When equity falls below maintenance, brokers handle it in different ways. Some send a call and give you time to deposit. Others auto-liquidate positions without notice, especially intraday, and liquidation happens at whatever the market price is when it triggers. Read your broker's margin agreement for the actual procedure. Also note that in a gap or a fast market, losses can exceed the cash you deposited, in which case you owe the difference.

Micro contracts

Micro E-mini contracts have one-tenth the point value of the standard contracts: MES is $5 per point against ES at $50, and MNQ is $2 against NQ at $20. Margin for micros is typically proportionally lower, but verify it with the exchange and your broker. Micros let you size a position in smaller steps, which matters when your risk budget is small.

Size by risk, not by margin

Risk per trade equals stop distance in points times point value times contracts.

• 10-point stop, 1 ES: 10 x $50 = $500.
• 20-point stop, 2 MES: 20 x $5 x 2 = $200.

A common budget rule is 1 to 2% of the account per trade, though that is a convention and not a guarantee of safety. On a hypothetical $25,000 account that is $250 to $500. One ES with a 5 to 10 point stop fits that, and so does a few MES with a wider stop. Remember that a stop order can slip, especially in fast markets, so the loss can come in above the number you computed. Build in a buffer.

The mistake to avoid is treating available margin as permission. Having enough margin to hold one MES does not make a 300-point stop reasonable, and having intraday margin for one ES does not cap the loss at that margin. Margin is collateral. Your stop and size define your risk.

A quick checklist before you trade

1. Look up the current exchange margin for your contract and your broker's requirement.
2. Find your broker's rule on margin calls and auto-liquidation.
3. Choose a stop in points, then compute dollar risk for your contract.
4. Pick the largest contract count where that risk fits your per-trade budget, rounding down.
5. Check your account against the overnight requirement even if you plan to day trade.

If you trade a funded or evaluation account, the firm's drawdown rules are separate from exchange margin, so read both. Related reading: what is futures trading, how to day trade futures, position sizing and ATR for stops. The 7-day trial into Intro at $97/month includes the course and daily ES/NQ KPL.