How this instrument works
A futures contract obligates the buyer to take, or the seller to deliver, a fixed quantity of something — bushels of corn, troy ounces of gold, an index basket, a currency pair — at a price agreed today, on a date set months out. Nobody pays the full value of that quantity up front. Instead, both sides post a fraction of it, called initial margin, as a good-faith deposit the clearinghouse holds while the position stays open.
The arithmetic behind that has two layers. Notional value is the number of units one contract controls multiplied by the going price — it measures the size of the position, not the size of the check anyone writes. Initial margin then takes a percentage of that notional figure, and the percentage is not something a trader picks; the exchange sets and periodically revises it based on how volatile the underlying has been, tightening it after wild sessions and loosening it once things settle.
The gap between those two numbers is leverage, and it is why futures exist for hedgers and speculators alike: a wheat farmer can lock in a selling price for a harvest worth far more than the cash tied up doing so, and a trader can hold a position many times the size their account balance would otherwise allow. The same gap is also the entire risk in the trade — a price move measured against the small margin, not the large notional figure, is what decides how fast that margin gets consumed or how soon a broker issues a call for more cash.
- Enter Contract size (units) — how many units one contract controls, such as 100 troy ounces for a COMEX gold contract or 5,000 bushels for CBOT corn.
- Enter Price per unit, $ — the current quoted futures price for a single unit of the underlying.
- Enter Initial margin requirement, % — the percentage of notional value your exchange or broker requires posted before the position can open.
- Read Notional contract value — the full dollar value of the position the contract controls.
- Read Required initial margin — the actual cash that has to be deposited to hold that position open.
Worked example — one COMEX gold contract
Take a single gold futures contract sized at 100 troy ounces, quoted at $1,900 an ounce. Contract size times price gives a notional value of 100 × $1,900 = $190,000 — the full dollar value of the gold the contract controls, regardless of how much cash sits in the trading account behind it.
The exchange's initial margin requirement of 5% is applied to that notional figure: $190,000 × 0.05 = $9,500. That smaller number, not $190,000, is what actually has to be posted to open the position, so the holder controls roughly twenty times more gold than the cash committed — and a price move of only a few percent against the position is enough to consume the entire margin deposit.
Questions
Is initial margin the same as a down payment?
No. A down payment reduces what you owe on an asset you are financing and builds equity in it. Initial margin is a refundable performance bond held by the clearinghouse while a leveraged position stays open — you do not own a share of the underlying, you post collateral against the risk of the full notional position, and it is returned, adjusted for gains or losses, once the position closes.
Does the required margin percentage ever change?
Yes, often without warning. Exchanges reset initial margin requirements, sometimes several times a month, based on realized and implied volatility in the underlying. A contract that required 5% last quarter can require 8% after a volatile stretch, which raises the cash needed to hold the identical position with no change in the price itself.
Is this the same margin used in gross profit margin?
No, and the shared word causes real confusion. Gross margin is profit divided by revenue on a sale of goods. Initial margin here is collateral divided by the notional value of a leveraged derivatives position — a different ratio entirely, used to control counterparty risk rather than measure profitability on a sale.
What happens when the price moves against the position?
The clearinghouse marks the contract to market daily and debits losses out of the account holding the margin. If the balance falls below a separate, lower threshold called maintenance margin, the broker issues a margin call demanding the account be topped back up to the initial level, or the position gets closed out.
Does the notional value figure represent money actually at risk?
Not directly — notional value represents the size of the position being controlled, not cash committed. The margin figure is the cash actually at stake up front, but losses are not capped there: a large enough adverse move can require depositing more cash than the original margin just to keep the position open.
Why do brokers sometimes require more than the exchange minimum?
Exchange-set initial margin is a floor, not a ceiling. Brokers routinely add a buffer above it to cover their own risk of an account moving faster than they can issue and collect a margin call, especially on smaller or less liquid accounts. That extra buffer varies by broker and is not shown in this instrument.
References
- CFTC Futures Glossary — definition of initial margin
- CFTC Learning Resources — futures market basics
Read this first: This instrument shows arithmetic, not advice. Real offers add fees, taxes and terms that vary by lender and place — verify the figures against your actual paperwork before deciding anything.