How initial and maintenance margin work, how leverage is calculated from margin, the mechanics of margin calls, and how to size futures contracts so leverage works for you instead of against you.
Key Takeaways
- Initial margin opens the trade; maintenance margin keeps it open.
- Leverage = Notional Value ÷ Margin — the same move hits margin that many times harder.
- A margin call demands more funds or forces liquidation when equity falls below maintenance.
- You can lose more than your initial margin in a fast, adverse move.
- Size contracts from dollar risk, not from how many contracts margin allows.
Initial vs. Maintenance Margin
Initial margin is the deposit required to open a futures position — typically 3%–12% of the contract’s notional value, set by the exchange and often adjusted by your broker. Maintenance margin is the lower minimum equity you must hold to keep the position open. If your account equity falls to the maintenance level, you receive a margin call: deposit more funds or the broker liquidates the position.
How Leverage Is Calculated
Leverage = Notional Value ÷ Initial Margin. A contract controlling $250,000 of exposure with $12,500 margin runs at 20:1 leverage.
Leverage tells you how much a given price move is magnified on your margin. At 20:1 leverage, a 1% adverse move in the underlying costs 20% of your margin. A 5% move — common in volatile markets — would wipe out the entire deposit.
The Mechanics of a Margin Call
Futures accounts are marked-to-market daily — gains and losses are credited and debited each session. If a losing day drops your equity to the maintenance margin, your broker issues a margin call. You can deposit more funds to restore equity to the initial level, or reduce position size. If you do neither, the broker will liquidate — often at the worst possible price. Margin calls are how leverage enforces its discipline.
You Can Lose More Than Your Margin
Unlike options (where maximum loss is the premium paid), futures losses are theoretically unlimited. A gap through your stop, a locked-limit move, or a fast liquidation can produce losses exceeding your initial margin. This is why professional futures traders size far smaller than their margin allows and keep cash reserves beyond the margin requirement.
Sizing from Risk, Not from Margin
The most common futures mistake is trading as many contracts as your margin allows. That maximizes leverage, not survival. Instead, size from dollar risk: decide how much you are willing to lose (1%–2% of equity), divide by the stop distance in dollars, and trade that many contracts. The TradeRiskMath futures calculator does this instantly for ES, NQ, CL, GC, and ZN — returning the contract count that holds risk constant regardless of how much margin you have.
Frequently Asked Questions
What is futures margin?
Margin is the good-faith deposit required to hold a futures contract, not a down payment on the underlying. Initial margin opens the position; maintenance margin is the level below which a margin call triggers.
What is a margin call?
A margin call occurs when your account equity falls below the maintenance margin. You must deposit more funds or the broker will close positions, often at the worst time.
Is leverage the same as margin?
No. Margin is the deposit; leverage is the ratio of position size to margin. A 100,000-dollar position on 5,000-dollar margin runs at 20:1 leverage.
Should I use all the leverage my broker allows?
No. Treat leverage as a ceiling, not a target. Size from dollar risk and keep effective leverage modest so ordinary volatility does not force a margin call.
Where can I size futures from risk?
The TradeRiskMath Futures calculator sizes contracts from your dollar risk and stop. Open it from the Futures hub.
The Bottom Line
Margin is the tool that makes futures capital-efficient; leverage is the consequence that makes them dangerous. Understand the difference between initial and maintenance margin, respect the margin-call mechanism, and always size from dollar risk rather than from how much margin your broker will let you use.
Educational Disclaimer
This article is provided strictly for educational purposes and does not constitute financial, investment, or trading advice. Trading stocks, options, futures, forex, and crypto involves substantial risk of loss. Always evaluate trades against your own financial situation and risk tolerance, and consult a licensed professional before making investment decisions. Past performance does not guarantee future results.