Day Margin vs Overnight Margin in Futures: What Changes at the Close (2026)
Futures day trading margin is the reduced capital your broker requires to hold a position during the session, on the condition that you are flat before the daily settlement. Overnight margin is the full requirement the clearing house sets to carry that same position through the close. They are different numbers produced by different institutions for different reasons, and the gap between them is often five to ten times.
That gap is where a lot of futures traders quietly misunderstand their own risk. A day margin figure feels like a statement about how risky a contract is. It is not. It is a statement about how long your broker is willing to carry you before the clearing house takes over the arithmetic.
This guide covers what each number is, who sets it and why, what happens at the moment of settlement if you are still holding, why low day margin creates a leverage illusion, and how none of it applies in the way traders assume inside a simulated funded account.
- Know who sets which number. The clearing house sets initial and maintenance margin. Your broker sets day margin, and can change it without notice.
- Treat day margin as credit, not as risk. A $500 intraday requirement on a contract with $20,000 of notional exposure tells you nothing about how far that contract can move.
- Respect the settlement boundary. Holding past the close switches you to the full exchange requirement, and brokers usually enforce it automatically.
- Expect margin to change under stress. Requirements are reviewed regularly and can be raised, including intraday, exactly when you least want it.
- In a simulated funded account the binding constraint is contracts and drawdown. Not a margin multiplier, because no clearing house is holding collateral.
Table of contents
- What each margin number actually is
- Who sets each one, and why they differ
- What happens at the close
- The leverage illusion low day margin creates
- How this works in a simulated funded account
What each margin number actually is
Overnight margin is the clearing house's initial margin requirement, historically called a performance bond. It is the good-faith deposit that guarantees you can meet the obligations of the contract, and it is calculated to cover a severe but plausible adverse move over a defined horizon. Day margin is a smaller number your broker accepts during the session because it plans to have you flat before that horizon begins.
CME Group describes performance bonds as deposits held at CME Clearing to ensure that clearing members can meet their obligations to their customers and to CME Clearing. Its performance bonds and margins documentation is the primary source, and the requirement is published per product rather than being a fixed percentage across the board.
Margin in futures is not a down payment
This is the single most persistent misconception in the market, and it is worth correcting before anything else. In equities, margin is borrowed money used to buy something. In futures, margin is collateral against a performance obligation. The CFTC glossary is explicit that futures margin is not partial payment on a purchase. Nothing has been purchased. You have agreed to a position whose value changes daily, and the deposit exists so the clearing house is not exposed if you cannot pay.
That distinction matters for how you should think about day margin. Because it is not a purchase price, halving it does not halve anything about the position. The contract's notional value, tick value and daily range are all unchanged. Only the amount of cash sitting behind them has moved.
Initial and maintenance are separate again
Within the exchange requirement there are still two figures. Initial margin is what you need to open. Maintenance margin is the level your equity must stay above to keep the position without a call. We covered the distinction in detail in our post on initial vs maintenance margin in futures. For the purposes of this article, treat both as parts of the same overnight requirement, sitting well above whatever number your broker quotes for intraday.
Who sets each one, and why they differ
The exchange sets overnight margin, the broker sets day margin, and the broker can never set a requirement below the exchange's for a position carried through settlement. That single sentence resolves most confusion about why the two numbers look nothing alike.
The exchange side: risk arithmetic
CME Clearing sizes performance bonds against modeled price moves, and states in its guidance on margin changes that margins are set to cover 99 percent of potential price moves. Requirements are reviewed on an ongoing basis and republished as volatility changes, which is why a contract's overnight margin is not a fixed figure you can memorize. When realized volatility rises, the requirement rises with it.
The clearing house can also collect additional margin intraday during significant market moves. That is not a punishment, it is the mechanism working as designed: the model says the existing collateral no longer covers the plausible move, so more is required immediately.
The broker side: a credit decision
Day margin is different in kind. Your futures commission merchant is extending you an accommodation, backed by its own capital and its own risk tolerance, on the assumption that it can force you out of the position during liquid hours if things deteriorate. That assumption is why the number can be so much lower. The broker is not carrying the overnight gap risk. You are expected not to create it.
Two consequences follow, and traders discover them at inconvenient moments. First, day margin varies enormously between brokers for the identical contract, because it reflects each firm's appetite rather than any market fact. Second, a broker can raise day margin, sometimes dramatically, ahead of holidays, major economic releases or elevated volatility, and it does not need your agreement to do so.
| Property | Day (intraday) margin | Overnight (exchange) margin |
|---|---|---|
| Who sets it | Your broker or FCM | The clearing house |
| What it is sized against | The broker's ability to force you flat in a liquid session | A modeled severe adverse move, covering 99% of potential price moves |
| Consistency across firms | Varies widely for the same contract | Identical for all participants |
| When it applies | During the day session only | Through the daily settlement and beyond |
| Can it change without notice | Yes, at the broker's discretion | Yes, and it can be called intraday |
| What it tells you about risk | Very little | A clearing house's estimate of a bad day |
General structure of the US futures market. Specific requirements are published per product and change with volatility. Confirm current figures with your broker and the exchange before sizing.
What happens at the close
At the daily settlement your account is measured against the full exchange requirement rather than the intraday one. If your equity covers it, nothing happens. If it does not, the broker will issue a margin call or liquidate the position, and most retail futures platforms do the latter automatically because they cannot rely on reaching you in time.
The automatic part is what surprises people. There is frequently no conversation, no grace period and no discretion. The platform's risk system compares equity to requirement at a defined cutoff and acts. Positions get closed at whatever price the market offers at that moment, which in a thin post-session book is rarely the price the trader had in mind.
The cutoff is earlier than the settlement
Brokers usually enforce their own flatten time some minutes before the official close, precisely so that liquidation happens in a book that still has liquidity in it. A trader planning to exit at the bell can find the position already closed. This is documented in the account agreement rather than announced, and it is worth reading yours specifically rather than assuming an industry standard.
Why the overnight number is so much larger
Because an overnight gap is a move you cannot trade through. During the session, a $2,000 adverse move happens in front of you, with a working order book and a chance to exit at intermediate prices. Overnight, the same $2,000 can appear as a single opening print. The clearing house sizes for the second case. Our post on overnight gaps in futures covers what actually produces them and why they cluster around scheduled events.
Futures day trading margin · Spec sheet
Two numbers, two institutions, one boundary
Day margin is your broker's credit decision. Overnight margin is the clearing house's risk model. The settlement is where one hands over to the other.
One trading day
Set by the broker
Day margin
- Differs firm to firm on the same contract
- Withdrawn around volatility and holidays
- Assumes you can be forced flat in liquid hours
- Says nothing about the contract's range
Set by the clearing house
Overnight margin
- Identical for every participant
- Rises as realized volatility rises
- Sized for a gap you cannot trade through
- Can be called again intraday
You approach the broker's flatten time
Usually minutes before the official close, so liquidation happens while the book is still deep.
Equity is compared to the full requirement
Not the intraday number. The accommodation ends at the boundary.
Shortfall triggers an automatic close
Most retail platforms liquidate rather than call, at the prevailing price.
The gap risk transfers, or it does not
If you cleared the requirement you carry the position and the overnight gap with it.
tradefundrr.com
Illustrative example. Requirements and cutoff times differ by broker and by contract. Simulated environment.
The leverage illusion low day margin creates
Low day margin makes a contract feel small, and the feeling is wrong in a specific and expensive way. The margin figure changes how many contracts you are permitted to hold. It changes nothing about how many dollars each tick is worth, which is the number that actually determines your loss.
An E-mini S&P contract moves $12.50 per tick regardless of whether your broker asked for $500 or $15,000 to hold it. If a $500 intraday requirement persuades a trader to hold four contracts instead of one, a normal twenty-point session becomes a four-figure swing against an account that was sized for something much smaller.
The right frame is dollars per point, not margin per contract
Size from the instrument's tick value and its typical range, then check that the resulting position clears the margin requirement. Doing it the other way round, starting with available margin and working out the maximum contracts, is the sequence that produces blown accounts. Our post on point value and dollar risk per tick works through the arithmetic contract by contract.
Micros exist for this reason
The micro contracts were designed to let traders express a view at a size their account can absorb, rather than relying on a low margin number to make an oversized position feasible. A trader who needs day margin to afford a mini is usually a trader who should be in micros. Our comparison of micro futures vs E-mini futures covers where the line sits.
- Start from tick value. Multiply by the contracts you intend to hold and by a realistic adverse move.
- Check the exchange requirement, not just your broker's. It is the number that binds if anything goes wrong.
- Know your broker's flatten time. In writing, from the account agreement, not from a forum post.
- Assume margin can rise before an event, not after. Requirements often move ahead of scheduled volatility.
- Never treat day margin as a risk measure. It measures your broker's tolerance, not the market's behavior.
How this works in a simulated funded account
A simulated funded futures account does not use day margin or overnight margin in the exchange sense, because no real position is carried and no clearing house is holding collateral against it. There is no performance bond, no margin call and no automatic liquidation triggered by a shortfall against a published requirement. The constraints are the account's own written rules.
Those rules do the same job through a different mechanism. Position limits are stated directly in contracts, minis and micros counted separately, rather than being implied by a margin figure. A daily loss limit caps what a single session can cost. A maximum drawdown caps the account's total. On a simulated 50K futures account that is a $1,000 daily loss limit against a $3,000 maximum drawdown, and on a 100K account it is $2,000 against $6,000.
Why that is easier to plan against
A stated contract limit removes the reverse-engineering entirely. You are not calculating how many contracts your margin permits, then discovering that the permitted number is far more than your account can survive. The number of contracts is given, and the loss limits tell you what each one may cost you before the session ends.
Where a program runs a soft daily loss limit, crossing it ends the trading day and the account continues into the next session. There is no warning count and no maximum number of crossings. What ends the account is the maximum drawdown, because every soft day still spends part of it. Confirm which structure applies in your own written account terms rather than assuming.
The overnight question still matters
Holding rules are set per program and stated in the account terms. Where a program requires positions to be flat by a stated time, that requirement functions like the broker cutoff described above, and for a similar reason: exposure through a period the trader cannot manage is a different risk from exposure during a session. Our posts on end of day flat rules and overnight and weekend holding rules cover how those are usually structured.
Why the live mechanic is still worth learning
The simulated environment exists to build habits that survive contact with a live account. Margin mechanics are a clean example. A trader who has internalized that day margin is a credit accommodation, that the exchange number is the real one, and that the settlement boundary is enforced automatically will size the same way in either environment. A trader who learned to size from whatever the platform allowed will find that the allowance changes at the worst possible moment.
Frequently asked questions
What is futures day trading margin?
Futures day trading margin, also called intraday margin, is a reduced amount of capital your broker requires to hold a position during the trading session on the condition that you close it before the daily settlement. It is set by the broker as a credit accommodation, not by the exchange, and it can be withdrawn at any time.
Who sets overnight margin in futures?
The clearing house sets it. CME Clearing publishes performance bond requirements, commonly called initial and maintenance margin, and brokers may require more but not less. CME states that margins are set to cover 99 percent of potential price moves, which is why the overnight figure is materially higher than a broker's intraday number.
What happens if I hold a futures position past the close with only day margin?
Your account is measured against the full exchange margin requirement at settlement. If your equity does not cover it, the broker will typically issue a margin call or liquidate the position automatically, often without discretion and at the prevailing price rather than a price you chose.
Why is day margin so much lower than overnight margin?
Because the broker is only carrying the risk for a few hours in a liquid session, not through an overnight gap. Overnight margin is sized to survive a move that happens while the market is effectively untradeable for the participant, which is a much larger worst case than an intraday move you can exit into.
Does a simulated funded futures account use day margin or overnight margin?
Neither in the exchange sense, because no real position is carried and no clearing house is holding collateral. A simulated funded account governs exposure through its own written rules: a position limit stated in contracts, a daily loss limit, and a maximum drawdown. Confirm the figures that apply to your program in your account terms.
Can I hold futures positions overnight in a TradeFundrr account?
Holding rules are set per program and are stated in the account terms rather than being universal across the industry. Because the position limit is expressed in contracts rather than in margin dollars, the constraint you plan around is contract count and drawdown, not a margin multiplier. Confirm your program's holding rules before you plan a strategy around them.
Can exchange margin change while I hold a position?
Yes. CME Clearing reviews and republishes performance bond requirements regularly and can raise them with short notice during volatile periods, and it can also call additional margin intraday. A position that was adequately margined yesterday can be short of the requirement today without you doing anything.
Size from contracts and dollars, not from a margin multiplier
TradeFundrr publishes the contract limit, daily loss limit, maximum drawdown, profit target and 80/20 split for every simulated futures program before you start, so the constraint is stated rather than inferred.
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