For traders navigating the dynamic world of digital assets, understanding risk management mechanisms is crucial. One of the most critical concepts in leveraged trading is the forced liquidation system, also known as margin call. This process protects both the exchange and users from excessive losses when positions move against them. In this guide, we’ll break down how liquidation works, what triggers it, and how you can manage your exposure effectively.
What Is Forced Liquidation?
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Forced liquidation occurs when your account's maintenance margin ratio drops to or below 100%. At this point, your equity (account value after unrealized profits and losses) equals or falls below the required maintenance margin plus any applicable liquidation fees.
When this threshold is breached, the system automatically intervenes by:
- Canceling pending orders
- Partially or fully closing open positions
The exact process varies depending on your account mode—whether you're using isolated margin, cross margin, or portfolio margin. Different products such as futures, options, and leveraged tokens may also follow unique rules.
You are responsible for monitoring your position health and maintaining sufficient margin levels at all times.
Maintenance Margin Ratio Explained
Your maintenance margin ratio isn’t a fixed number—it’s a dynamic percentage that changes based on several factors including:
- Adjusted equity (your total account value including unrealized P&L)
- Position size
- Account mode
- Asset volatility
This ratio determines how much collateral you must maintain to keep a leveraged position open.
What Is Maintenance Margin?
Maintenance margin is the minimum amount of equity required to sustain an open position. If your adjusted equity falls below this level, your position becomes vulnerable to liquidation.
Let’s explore how different account models affect these requirements.
A. Account Modes and Their Impact
Different margin systems calculate risk differently:
- Isolated Margin: Each position has its own dedicated margin. Liquidation affects only that specific position.
- Cross Margin (Spot & Futures): All positions in a single currency share the same margin pool. Risk is evaluated across all holdings.
- Multi-Currency Cross Margin: Consolidates multiple currencies into one risk bucket using discount rates.
- Portfolio Margin (Combination Mode): Uses advanced stress testing under extreme market scenarios to determine required margins—offering higher efficiency but stricter criteria.
In isolated, cross, and multi-currency modes, the total maintenance margin is calculated by summing up each position’s value multiplied by its corresponding maintenance rate.
In portfolio margin mode, however, the system evaluates worst-case scenario losses instead of relying solely on standard maintenance rates.
B. Position Tiering System
Larger positions require higher maintenance margins due to increased risk exposure. This is managed through a tiered system, where bigger positions fall into higher tiers with progressively stricter margin requirements and lower maximum leverage.
| Key Benefits of Tiering:
| - Prevents large-scale forced sales that could destabilize markets
| - Reduces slippage during volatile conditions
| - Limits systemic risk on the platform
For example, in BTC/USDT perpetual contracts, if a user holds:
- 1,000 contracts (weekly)
- 500 contracts (next week)
- 500 contracts (quarterly)
- 500 contracts (next quarter)
The total count is 2,500 contracts, placing them in Tier 2, which comes with defined margin and leverage limits.
⚠️ Note: OKX reserves the right to adjust tiering parameters at any time to manage platform risk. Users attempting to bypass tier limits via multiple accounts may have their positions closed without notice.
Products Overview: How Different Instruments Are Handled
Futures Contracts (Delivery & Perpetual)
- Isolated Mode: Calculated per contract and direction.
- Cross Mode: Aggregates all positions in the same underlying asset across expiries.
Total contract quantity determines the applicable tier and margin rate.
Leveraged Tokens & Margin Trading
Maintenance requirements are based on borrowed amounts:
- Isolated & Cross Margin: Follow "pair-based gradient" rules
- Multi-Currency & Portfolio Modes: Use "currency-based gradient"
Options Trading
Options use a tiered structure based on contract quantity:
- Applies in isolated margin mode
- Not used in portfolio margin mode, which relies on stress testing
Liquidation Fees: What You Need to Know
When a position is liquidated, two types of fees typically apply:
1. Liquidation Fee
Charged during forced closure of a position. The rate depends on your current fee tier:
- For spot and futures: Based on standard fee schedules
- For options: Equal to your fee tier rate + 12.5% of the option premium
2. Clearing Fee (Liquidation Surcharge)
This additional charge covers potential losses due to market slippage or adverse price movements during liquidation. It helps fund the risk provision fund, which protects other users from systemic defaults.
Clearing Fee Calculation by Mode
Spot & Margin Accounts
- Isolated:
ABS(liability) × pair gradient rate - Cross (Spot/Futures):
ABS(liability) × pair gradient rate Multi-Currency/Portfolio:
- Assets and liabilities are assessed separately
- No fee if USDT is involved
- Fees applied progressively based on tiered discount rates
Futures Contracts
- Coin-Margined:
Contract value × multiplier × liquidated contracts / mark price × tier rate - USDT-Margined:
Contract value × multiplier × liquidated contracts × mark price × tier rate
Options
- Call Options:
C × margin factor × liquidated contracts - Put Options:
Max(C, C × mark price) × margin factor × liquidated contracts
WhereC= configuration parameter set by the system
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The Liquidation Process: Step by Step
Liquidation procedures vary by account type:
General Trigger
When your maintenance margin ratio hits 100% or lower, OKX:
- Blocks new leveraged orders
- Begins automatic risk mitigation
The system may use risk provision funds to cover initial losses while closing high-risk positions first—especially those with the highest margin usage.
OKX does not guarantee full loss coverage via its risk fund.
Full Process Flow
For Cross-Margin Spot & Futures Positions
- System identifies liability
- Begins reducing exposure starting with most liquid assets
- Collects clearing fees from remaining assets
For Multi-Currency & Portfolio Margin Accounts
- Non-USDT Liability: Starts from liability side; reduces based on liquidity and tier
- USDT Liability: Begins from asset side; clears highest-discount-rate coins first
All actions aim to restore solvency efficiently while minimizing market impact.
Frequently Asked Questions (FAQ)
Q: What happens when my position gets liquidated?
A: Your position is automatically closed—either partially or fully—to prevent further losses. Fees are deducted, and any remaining balance stays in your account.
Q: Can I avoid liquidation entirely?
A: While you can't eliminate the risk completely, you can reduce it by using lower leverage, adding more margin manually, or setting stop-loss orders.
Q: Why did my entire portfolio get affected instead of just one trade?
A: In cross-margin modes, all positions share the same collateral pool. A drop in one asset’s value can trigger liquidation across multiple holdings.
Q: How often are tier levels updated?
A: Tier structures may be adjusted periodically by OKX to reflect market conditions and platform risk levels.
Q: Is there a warning before liquidation occurs?
A: Most platforms provide real-time margin ratio tracking. When approaching dangerous levels, alerts are triggered—but execution depends on market speed.
Q: Where does the liquidation fee go?
A: Net proceeds from liquidations are deposited into the risk provision fund, which insures against cascading defaults during extreme volatility.
Final Thoughts: Stay Ahead of Risk
Trading with leverage amplifies both gains and losses. Understanding how forced liquidation works empowers you to make informed decisions and protect your capital.
👉 Start practicing with real-time analytics to stay ahead of margin calls.
Remember:
- Monitor your maintenance margin ratio constantly
- Use conservative leverage for larger positions
- Diversify across account modes based on strategy
- Never assume risk provision funds will save your position
Digital asset trading involves significant risk. Past performance does not indicate future results. You alone are responsible for your trading decisions. OKX is not liable for any losses incurred.
This article is for informational purposes only and does not constitute financial, legal, or tax advice.