What it means
When you buy a futures contract or trade on margin, you control an amount of exposure far larger than the cash you have handed over. The broker or exchange holds initial margin as protection, sized to cover a plausible one or two day adverse move in the contract.
It is refunded when the position closes, adjusted for whatever profit or loss occurred. Alongside initial margin sits maintenance margin, a lower threshold that the account balance must not fall below.
As prices move, the position is marked to market daily and gains or losses are credited or debited, and if the balance drops below maintenance margin the trader receives a margin call demanding a top-up. Fail to meet it and the broker closes the position, crystallising the loss.
The commercial relevance extends well beyond speculative trading. Businesses hedging currency, fuel or commodity exposure through exchange-traded contracts must post initial margin and then fund daily variation margin, which means a hedge that is economically sound can still create severe short-term cash demands.
Treasury teams model this explicitly, because a hedge that works on paper is useless if it bankrupts you before settlement. Margin rates are set by exchanges and brokers based on volatility, and they change.
During periods of turbulence, exchanges raise initial margin requirements, which forces traders to post more collateral exactly when cash is hardest to find and can amplify the original price move. A useful nuance is the difference between initial margin in derivatives and in equity margin lending.
In futures, initial margin is a performance bond covering potential loss on a contract, whereas in share dealing on margin it is the equity portion of a purchase partly funded by a broker loan, with the shares themselves as security.
In practice
Real-world examples.
Example
An airline hedges 500,000 gallons of jet fuel using exchange-traded contracts and posts $850,000 of initial margin. When prices fall sharply, the hedge shows a paper loss and the airline funds $1,200,000 of variation margin over three weeks, even though the position is offsetting a real reduction in its physical fuel costs.
Example
A retail investor buys $50,000 of shares using a margin account with a 50% initial margin requirement, contributing $25,000 of her own cash and borrowing $25,000. A 40% fall in the shares wipes out $20,000, taking her equity to $5,000 on a position now worth $30,000, well below the 25% maintenance requirement, and triggering a call to add funds.
Example
A grain merchant setting up a hedging facility negotiates the size of its initial margin deposit as part of the broker agreement. Because it can post government bonds rather than cash as collateral, it meets the $400,000 requirement without disturbing its working capital.
Think of it
“Initial margin is the deposit to open a position-your upfront collateral.
Formula
Calculation
Initial margin = Notional contract value x Initial margin rate
Notional contract value = Number of contracts x Contract size x Price
Leverage = Notional contract value / Initial margin
Suppose a fuel distributor buys 10 crude oil futures contracts, each covering 1,000 barrels, at a price of $75.00 a barrel. The notional value is 10 x 1,000 x $75.00 = $750,000. With an initial margin rate of 8%, the required deposit is $750,000 x 0.08 = $60,000, giving leverage of $750,000 / $60,000 = 12.5 times.
Now assume maintenance margin is set at 6% of notional, or $750,000 x 0.06 = $45,000. If the price falls to $73.00 a barrel, the loss is $2.00 x 10,000 barrels = $20,000, so account equity drops to $60,000 - $20,000 = $40,000. That is below the $45,000 maintenance level, so the broker issues a margin call for $20,000 to restore the account to the $60,000 initial requirement.Case study
Seen in the real world.
Redlake Copper Trading is a fictional metals merchant used purely for this illustrative case study. It hedged forward sales of copper with futures contracts, a sensible policy that protected margins on its physical order book.
The treasury team sized its credit facility around the initial margin on the opening positions, roughly $1,800,000, and gave no thought to variation margin. When copper prices rallied 18% over five weeks, the hedge moved against Redlake by about $4,600,000, all of which had to be posted in cash daily, while the offsetting gain on the physical contracts would not arrive until delivery months later.
Redlake had to sell inventory at short notice and negotiate an emergency overdraft at a punitive rate. In this fictional example the hedge was correct and eventually profitable in economic terms, but the company nearly failed because it had budgeted for initial margin and forgotten that margin is a continuing obligation, not a one-off deposit.
Watch out
Common mistakes.
- Treating initial margin as the maximum you can lose. It is a deposit, not a cap, and losses on a leveraged position can exceed the amount originally posted.
- Budgeting for initial margin but not variation margin. The daily cash calls on a losing position frequently dwarf the opening deposit and are the usual cause of forced closures.
- Assuming margin rates are fixed. Exchanges raise requirements when volatility rises, so the collateral demand grows precisely when markets are stressed.
Questions
People also ask.
What is the difference between initial and maintenance margin?
Initial margin is the deposit needed to open a position, while maintenance margin is the lower balance the account must stay above, and falling below it triggers a margin call.
Does posting initial margin mean I own the asset?
No, in futures you hold a contractual obligation rather than the underlying commodity, and the margin is collateral that is returned when the position is closed or settled.
Can margin be posted as something other than cash?
Often yes, since many brokers and clearing houses accept government bonds or other high-quality securities, usually with a haircut reducing the value credited.
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