Why futures brokers charge two different margins: broker day margin vs CME maintenance
When you trade CME Group futures (CME, CBOT, COMEX and NYMEX contracts) in a personal brokerage account, two margin levels decide how many contracts you can hold. During the session many brokers set their own reduced day-trade margin for positions you close the same day: on 22 Oct 2026 Tradovate listed $50 for MES, MYM and M2K and $100 for MNQ, and $500 for ES, YM and RTY and $1,000 for NQ. To hold a position past the daily 4:00 PM CT close you need the exchange margin set by CME Clearing instead. CME's maintenance margin for the December 2026 contracts was $2,621 for MES, $4,258 for MNQ, $26,214 for ES and $42,579 for NQ on the same date, more than 40 times the day rates, and brokers usually ask for initial margin to carry a position (Tradovate's initial was about 110% of CME maintenance). NinjaTrader, for example, applies day margins until 15 minutes before the session close; a position that does not meet the overnight requirement may be liquidated by the broker, usually with a fee. Margins change often, so treat these as dated examples and check your broker's current numbers.
Full-size contracts and their Micros
The Micro E-mini index futures are one-tenth of the E-minis: MES is $5 per point against ES at $50, MNQ $2 against NQ at $20, MYM $0.50 against YM at $5 and M2K $5 against RTY at $50, with the same tick sizes. Gold, silver and crude oil are full-size contracts, not E-minis: Micro Gold (MGC, 10 oz) is one-tenth of GC (100 oz), Micro WTI Crude (MCL, 100 barrels) is one-tenth of CL (1,000 barrels), and Micro Silver (SIL, 1,000 oz) is one-fifth of SI (5,000 oz). Contract units and tick values are from CME Group's contract specifications.
Pair CME margin checks with position sizing, prop firm comparisons and Section 1256 tax math
Size your exact contract count from dollar risk in our Futures Position Size Calculator, compare personal CME brokerage tax treatment in the US Section 1256 (60/40) Tax Calculator, or compare personal futures against funded evaluations in the Futures vs Forex Prop Firm Calculator.