Quick Answer
Futures margin is a performance bond posted by both the long and the short, not a loan, so no interest accrues and no ownership changes hands. Exchanges set the initial and maintenance levels. A margin call restores equity to the initial requirement, not just maintenance. Hedgers and spread traders post less margin because their positions carry less net risk.
The whole unit on one sheet: what futures margin actually is, how initial and maintenance levels drive a call, and why hedgers and spreaders pay less than an outright speculator.
What Kind of Deposit Is Futures Margin?
- Futures margin is a performance bond: a good-faith deposit that guarantees a trader can meet the contract's obligations, not a down payment or partial payment.
- Both the long and the short post it, because a futures contract obligates both sides. Securities margin is posted by the buyer alone.
- It involves no loan and no interest. The money stays the trader's own funds held as security, unlike a securities margin loan under Regulation T.
- The exchanges, through the clearinghouse, set and revise the levels, not the Federal Reserve and not the Commodity Futures Trading Commission (CFTC). A revised requirement can reach positions already open, not just new trades.
Which Numbers Matter Most?
| Concept | What It Means |
|---|---|
| Initial requirement | Amount posted per contract to open a position |
| Maintenance requirement | Minimum equity to keep the position open; set below initial |
| Margin call trigger | Equity falls below maintenance |
| Margin call amount | Restores equity to the INITIAL requirement, not just maintenance |
| Variation margin | Daily cash settling gains and losses at mark-to-market |
| Withdrawal floor | Equity above initial may be withdrawn, but only down to initial |
| Hedge margin | Lower than a speculator's, because an offsetting cash position cuts net risk |
| Spread margin | Lower than two outright positions, because the offsetting legs cut net risk |
Why Do Hedgers and Spread Traders Post Less Margin?
- A bona fide hedger holds an offsetting position in the cash market, so a loss on one side is roughly matched by a gain on the other. Less net risk means a smaller performance bond.
- A spread trader holds offsetting long and short futures legs. A market-wide swing largely cancels between the two, so the trader is exposed mainly to the price relationship between the legs, not the full move.
- Both cases share one thread: offset reduces risk, and reduced risk reduces margin.
Which Gotchas Trip Students Up?
- A futures margin call restores equity to the initial requirement, not to maintenance. Applying the securities maintenance-call rule to futures is the most-flipped fact in the unit.
- Regulation T governs securities margin, not futures margin. The Federal Reserve's authority stops at securities; exchanges set futures levels.
- A requirement increase can reach a position already open, not only new trades.
- The withdrawal floor is the initial requirement, not maintenance. Equity can sit between the two without triggering a call, yet it cannot be drawn below initial.
One-Breath Recap
Futures margin is a performance bond posted by both the long and the short, never a loan, so no interest accrues and no ownership passes; the exchanges, through the clearinghouse, set the initial requirement to open a position and a lower maintenance requirement to keep it open, and a margin call triggered by equity falling below maintenance must restore equity all the way to the initial level, not merely to maintenance, while excess equity above initial may be withdrawn but never below it; a bona fide hedger's offsetting cash position and a spread trader's offsetting futures legs each cut net risk, so both post less margin than an outright speculator holding the same exposure.
Need more than the recap? Read the full Margin Requirements unit.