The larger the trade size, the higher the risk level associated with the trade. Therefore, we may increase our margin requirements for larger size trades or any additional trades in that instrument.
To do this, FOREX.com Web Trader platform increases the size of the margin requirement at specific quantity levels, known as step margin levels.
You can view a market’s step margin levels in its Market Information Sheet within the FOREX.com platform.
Step margins are not present in MetaTrader 4.