What is Maintenance Margin?
Maintenance margin is the minimum amount of equity a trader must maintain in their account to keep a leveraged position open. If account equity falls below the maintenance margin requirement, the position is subject to liquidation. It acts as a buffer protecting the exchange and counterparties from losses if a position moves against the trader.
Maintenance Margin vs. Initial Margin
Initial margin is the collateral required to open a position. Maintenance margin is the minimum required to maintain it. Initial margin is always higher than maintenance margin, creating a buffer zone between opening a position and being liquidated.
For example, a platform might require 10% initial margin allowing 10x max leverage but only 5% maintenance margin. This means you need 10% to open the position, but it only gets liquidated when losses reduce equity to 5% of position value.
How Maintenance Margin Works
As a position accrues unrealized losses, account equity decreases. The position remains open as long as equity exceeds the maintenance margin requirement. Once equity drops to or below maintenance margin, liquidation is triggered.
Equity equals Initial Margin plus Unrealized Profit and Loss. Liquidation occurs when Equity is less than or equal to Position Size multiplied by Maintenance Margin Rate.
Maintenance Margin Rates
Maintenance margin rates vary by platform, asset, and position size. Typical rates range from 0.5% to 5% of position value. Higher-risk or less liquid assets often have higher maintenance margin requirements. Larger position sizes may also face tiered increases in maintenance requirements.
Understanding the specific maintenance margin rates on your trading platform is crucial for accurate risk management and calculating liquidation prices.
Margin Ratio and Warnings
Many platforms display a margin ratio calculated as Maintenance Margin divided by Equity times 100%. As this ratio approaches 100%, you are nearing liquidation. Platforms typically issue warnings at certain thresholds, such as at 80% margin ratio, giving traders opportunity to add collateral or reduce position size.
Managing Maintenance Margin
To avoid liquidation, traders can add collateral to their position, increasing equity. They can partially close positions to reduce margin requirements. They can set stop-losses to exit before liquidation threshold. During volatile markets, actively monitoring maintenance margin status is essential for position survival.