Futures day trading margin: $50 opens a micro S&P contract, and fifteen minutes before the close the requirement becomes $2,844.75

NinjaTrader's intraday margins, the exchange-based margins behind them and CME's contract specifications, read on 16 September 2026. The day margin is under 2% of the overnight one, it ends at 15:45 Central, and $50 on a micro S&P is a ten-point move.

Last verified 16 September 2026 · how we check

A futures broker advertising “$50 day trading margins” is quoting a real number. It is also quoting the smallest of three numbers for the same contract, the one that applies for the shortest time, and the one the broker can change without notice.

Three margins for one contract

NinjaTrader publishes all three for every contract it offers. Its table was dated 16 September 2026 when we read it:

The day margin is NinjaTrader’s own figure. Initial margin is the one NinjaTrader says is set by the exchange: what you need to hold a position into the next session. In every row above, the initial figure is maintenance plus 10%.

The day margin on a micro S&P contract is 1.8% of the initial margin. The ratio is not constant: 57 times on the S&P contracts, 11 times on crude oil. How far the day margin sits below the exchange’s figure is a choice the broker makes contract by contract.

What $50 buys, in index points

CME’s specifications give the dollar value of a point:

A ten-point move in the S&P 500 is the whole day margin, on the micro and the full-size contract alike. The micro is a tenth the size and has a tenth the margin, so it does not give more room, only a smaller amount at stake.

Costs come out of the same $50. On NinjaTrader’s free plan a micro S&P round turn costs $1.88 all-in, which we itemized in futures commission per contract. That is 1.5 ticks, and 3.8% of the day margin before the price has moved at all.

The day margin ends at 15:45

NinjaTrader’s policy: intraday rates apply “from the product open until 15 minutes prior to the session close, when initial margin is required”.

For the equity index, currency, crude oil, gold and Treasury bond contracts it lists, the day margin ends at 15:45 CT against a 16:00 close. For wheat it ends at 13:05. The CME trading hours set the close; the broker sets the cut-off before it.

At 15:45 an account holding one micro S&P contract needs $2,844.75, not $50. An account that does not meet the requirement is, in the policy’s words, “subject to liquidation and applicable fees”.

Holidays shorten this further. On early-close days NinjaTrader states that intraday margin “is not extended through the holiday trading halt”, and positions must meet initial margin 15 minutes before the early close. Those early closes fall on dates that are easy to misjudge, which we set out in the CME holiday calendar.

Around news, the margin can quadruple

The same policy says intraday margins “may be set to 4X our standard rates at least 15 minutes prior to the release of key economic news announcements”. On a micro S&P that is $200.

Two details matter. The higher rate applies “only when entering a new position”, so a position already open keeps its margin. And it stays in place after the release until volatility is “determined to present manageable risk”, which is a judgement rather than a time.

Separately, the risk team “reserves the right to adjust intraday margins” and may do so “without prior notification”. The $50 is a current setting, not a contract term.

A liquidation costs a fee on top of the loss

If an account does not meet the margin requirement “at all times during the trade”, the policy says the entire position may be liquidated, with an execution fee:

On a micro S&P, a second liquidation costs as much as the whole day margin.

The margins page adds one more line, without further explanation: “your account will be liquidated if the balance goes below $50 if trading a $25 margin contract”. Read literally, the liquidation point on that contract is twice its day margin. The page does not say whether the same ratio applies to the $50 contracts.

What to take from this

Treat the day margin as a floor, not a deposit size. NinjaTrader says so itself: an account balance equal to the intraday margin will open a position, but it encourages traders to “view this as the minimum required to maintain” one.

Know the time your margin changes. For index futures at this broker it is 15:45 CT, and earlier on holidays.

Check the news calendar before entering, not after. The fourfold rate applies to new positions from at least 15 minutes before a release.

Count the fee in the loss. A $25 or $50 liquidation charge is large against a $50 margin.

What we checked, and what we didn’t

Day, maintenance and initial margins were read from NinjaTrader’s margins table, dated 16 September 2026, and the margin policy, news rule, cut-off times and liquidation fees from its margin and position management page the same day. Point values and tick sizes are from CME Group’s contract specifications for MES, MNQ and ES. Ratios and point equivalents are our arithmetic on those figures.

Margins change daily with the exchange and at the broker’s discretion, so the dollar figures above describe one day. We have not compared day margins at other futures brokers, and we have not traded at NinjaTrader or been liquidated there. For the platform’s commission plans, see NinjaTrader fees.

Sources

• NinjaTrader: margins by market, as of 16 September 2026
• NinjaTrader: margin policy and position management
• CME Group: Micro E-mini S&P 500 contract specifications
• CME Group: Micro E-mini Nasdaq-100 contract specifications
• CME Group: E-mini S&P 500 contract specifications