In leverage trading, forced liquidation is a core component of risk management. For investors trading USDT perpetual contracts on platforms like Bybit, a clear understanding of the platform's specific liquidation rules is crucial. This article will systematically analyze Bybit's forced liquidation process based on official rules and public information.
Trigger Conditions for Forced Liquidation
Forced liquidation is a mechanism where an exchange, to protect itself and counterparties from unlimited losses, forcibly closes a leveraged trading position when its margin or collateral value falls below the minimum maintenance margin threshold required to sustain that position.
On Bybit, the key price indicator that triggers liquidation is the "Mark Price," not the latest market transaction price. The purpose of using the Mark Price is to prevent unnecessary forced liquidations due to low liquidity at a single point or momentary market manipulation, making the trigger process more equitable.
Forced Liquidation Process
When market price movements are unfavorable to a position, causing the margin balance to drop to the maintenance margin threshold, Bybit's automated liquidation engine intervenes, and traders lose the ability to manually manage that position. The liquidation process typically follows a "tiered" principle:
- Engine Takeover: The system takes over the position slated for liquidation.
- Attempt Partial Liquidation: If the position supports partial liquidation, the engine will prioritize executing it to reduce the position size and restore the margin ratio, aiming to avoid full liquidation. This does not apply to all position types.
- Full Liquidation: If partial liquidation is insufficient to restore the margin level to safety, the engine will execute a full liquidation of the position.
- Bankruptcy Price Liquidation: The liquidation engine executes the liquidation at the "bankruptcy price." The bankruptcy price is the point at which a trader's margin balance reaches zero, and the position can no longer cover further losses.
Liquidation Differences Across Margin Modes
Bybit's Unified Trading Account supports Isolated, Cross, and Portfolio Margin modes, and the trigger logic for forced liquidation differs significantly across these modes:
- Isolated Margin Mode: Each position is managed independently with a fixed amount of margin allocated to it. Forced liquidation is triggered only when the Mark Price of that specific position reaches its preset "liquidation price." The liquidation of one position does not affect other positions in the account.
- Cross Margin Mode: All available margin in the account is shared to support all positions. Forced liquidation is not based on the liquidation price of a single position, but rather triggered when the account's overall "maintenance margin ratio" reaches 100%. This means that even if an individual position has not yet reached its liquidation price, an excessively high overall account risk may lead to the liquidation of all or part of the positions.
- Portfolio Margin Mode: Similar to Cross Margin mode, liquidation is also determined by the account-level maintenance margin ratio reaching 100%.
Insurance Fund and Auto-Deleveraging
To prevent extreme losses from forced liquidation, Bybit employs risk hedging mechanisms:
- Insurance Fund: When the actual execution price of a forced liquidation is worse than the position's "bankruptcy price," the resulting additional losses are first covered by Bybit's insurance fund. This aims to protect liquidated traders from excessive losses beyond their initial margin.
- Auto-Deleveraging (ADL): If the insurance fund is insufficient to cover all losses from liquidations executed at prices worse than the bankruptcy price, the system will trigger Auto-Deleveraging. ADL will partially close the positions of the most profitable counterparties, ranked by profit size and leverage, to raise funds to cover the deficit.
Related Data and Fee Information
The maintenance margin ratio is calculated in tiers based on the position's risk limit. For example, for BTCUSDT perpetual contracts (referencing April 2026 data), for a position value within a certain range (e.g., 2,000,000 USDT and below), the maintenance margin ratio is 0.5%; as the position value increases, the required maintenance margin ratio also increases.
Leverage and liquidation price are closely related. Higher leverage means the liquidation price is closer to the opening price. For instance, with 20x high leverage, approximately a 4.5% adverse price movement could trigger liquidation; with 10x leverage, the buffer space expands to about 9.5%.
Bybit does not charge separate liquidation fees for perpetual contracts and futures trading, but it does charge liquidation fees for scenarios such as spot leverage, crypto loans, and delisted assets on the platform (e.g., Bybit Alpha delisted assets, where automatic system liquidation incurs a 0.5% fee).
Core Principles of Risk Management
Understanding the forced liquidation mechanism aims to manage risk more effectively. Traders can reduce the probability and impact of being forcibly liquidated by: using lower leverage multiples, setting reasonable stop-loss orders, choosing a margin mode based on their risk appetite (e.g., beginners may prefer the risk-isolated Isolated Margin mode), and continuously monitoring their account margin levels.
