Maintenance Margin is the minimum margin required to continue holding a position.
For USDT contracts, the Maintenance Margin Base Value is 0.5% total contract value (Including all USDT pairs) when opening a position. It will increase or decrease accordingly as the tiered margin.
Liquidation occurs when the isolated margin for the position is less than its maintenance margin level.
Order Value = Contract Size x Entry Price
Maintenance Margin = Maintenance Margin Rate x Order Value
The maintenance margin rate (MMR) required for a position is based on the tiered margin where every tier (1,000,000USDT) increases by 0.5%.
Trader place a long position of 1 BTC at USDT 10,000 with 50x leverage (Isolated Margin).
Initial Margin = 1 x 10,000 x 1/50 = 200 USDT
Maintenance Margin = 1 x 10,000 x 0.5% = 50 USDT
This means that this position could take an unrealized loss (Mark Price) of up to 150 USDT (200USDT – 50USDT) before liquidation takes place.
You may refer to the Maintenance Margin basic value under 'Contract Details' located on the main trading page.