Understanding how maintenance margin ratios work is essential for traders engaging in leveraged positions across spot, futures, and options markets. These ratios determine the minimum equity needed to keep positions open and play a critical role in risk management—especially when market volatility threatens account stability. This guide breaks down the tiered maintenance margin ratio rules, explains how liquidation is triggered, and outlines key fee structures across different account modes.
What Is a Maintenance Margin Ratio?
The maintenance margin ratio is a percentage-based metric that reflects whether your account has enough equity to sustain its current leveraged positions. When this ratio drops to 100% or below, it means your adjusted equity (account value after unrealized P&L) is equal to or less than the required maintenance margin plus any applicable fees—triggering an automated forced liquidation.
Liquidation involves one or more actions: order cancellation, partial position closure, or full liquidation. The exact process varies depending on your account mode and position size tier.
👉 Discover how to optimize your margin usage and avoid unexpected liquidations.
How Maintenance Margin Requirements Are Calculated
Maintenance margin requirements are not fixed—they dynamically adjust based on three core factors:
- Account equity (adjusted for unrealized gains/losses)
- Account mode (isolated vs. cross-margin)
- Position tier (based on position size)
These variables ensure that larger positions carry proportionally higher risk buffers, helping maintain platform stability during volatile market conditions.
Account Mode Differences
Different account modes calculate maintenance requirements in distinct ways:
Isolated Margin
Each position is evaluated independently. The maintenance margin is calculated as:
Position Value × Tier-Specific Maintenance Margin Rate
This means each trade must meet its own margin threshold, limiting cross-position risk exposure.
Cross-Margin (Spot & Futures)
All positions in the same asset are grouped together. The total position size determines the applicable tier and required margin:
Sum of (Position Value × Maintenance Margin Rate per Tier)
For example, holding 1,000 BTC weekly futures, 500 bi-weekly, 500 quarterly, and 500 bi-quarterly contracts totals 2,500 contracts, placing you in Tier 2 for BTCUSDT.
Portfolio Margin Mode
Instead of using standard maintenance rates, this mode applies stress-test scenarios to estimate worst-case losses. The required margin reflects potential drawdowns under extreme market moves, offering a more holistic risk assessment.
Understanding Position Tiers
Position tiers are a risk mitigation mechanism: the larger your position, the higher the maintenance margin requirement and the lower the maximum allowable leverage.
This tiered structure prevents oversized positions from being liquidated at unfavorable prices—a scenario that could destabilize market liquidity.
| Key Benefits of Tiered Margins |
|---|
| Prevents disorderly liquidations of large positions |
| Reduces systemic risk during high volatility |
| Encourages responsible position sizing |
OKX reserves the right to adjust tier thresholds based on market conditions. Users are strictly prohibited from using multiple accounts to bypass tier limits. If such behavior is detected and deemed risky to market integrity, OKX may intervene by closing or taking over affected positions.
Liquidation Fees and Clearance Fees
When your maintenance margin ratio hits 100%, forced liquidation begins. Two types of fees apply:
1. Liquidation Taker Fee
This fee covers the cost of executing the liquidation order and is charged at your current taker fee rate, based on your trading tier.
For options, the liquidation fee includes:
Your taker fee rate + 12.5% of the option premium
2. Liquidation Clearance Fee
An additional fee may be applied to cover slippage, market impact, and uncovered losses during liquidation. These fees help replenish the insurance fund, which protects all users from auto-deleveraging events.
Spot & Margin Liquidation Clearance Fee Breakdown
- Isolated Mode:
Liabilities = ABS(liability amount) × (Tier maintenance requirement / Trading pair rate) - Cross-Margin Mode:
Liabilities = ABS(liability amount) × Tier maintenance requirement Multi-Currency & Portfolio Mode:
- No clearance fee if USDT is involved
- Asset-side liquidation follows crypto discount gradients
- Liability-side uses a tier-hopping method based on position tier
Futures Clearance Fee Calculation
- Crypto-Margined Contracts:
Face value × Contract multiplier × Positions liquidated / Mark price × Tier margin rate - USDT-Margined Contracts:
Face value × Contract multiplier × Positions liquidated × Mark price × Tier margin rate
Options Clearance Fee (Portfolio Margin Only)
- Call Option:
C × Margin factor × Number of positions
(C = configuration parameter) - Put Option:
Max(C, C × Option mark price) × Margin factor × Number of positions
All net proceeds from these fees go directly into the insurance fund.
👉 Learn how insurance funds protect traders during volatile markets.
The Forced Liquidation Process
Once your maintenance margin ratio reaches or falls below 100%, OKX initiates the following steps:
- Cancel or reject new orders requiring additional margin
- Take control of the highest-risk position
- Use internal insurance funds to begin liquidation
While OKX may use its insurance fund to cover losses, there is no guarantee that losses will be fully absorbed.
Liquidation Workflow by Account Type
For Isolated & Spot/Futures Cross-Margin Positions:
- System assumes liability based on position tiers
- Collects necessary funds from assets
- Applies liquidation clearance fees accordingly
For Multi-Currency Cross-Margin & Portfolio Accounts:
- If liability is in non-USDT crypto: prioritize settling liabilities first, starting with most liquid assets and considering discount tiers
- If liability is in USDT: begin with asset-side liquidation, reducing holdings by liquidity and discount rate
Frequently Asked Questions (FAQ)
What happens when my maintenance margin ratio hits 100%?
Your account triggers forced liquidation. Orders are canceled, and positions start being closed automatically to prevent further risk exposure.
How can I avoid liquidation?
Monitor your maintenance margin ratio closely, reduce leverage on large positions, and maintain sufficient equity. Using stop-loss orders can also help manage downside risk.
Are liquidation fees refundable?
No. Liquidation taker and clearance fees are non-refundable and are used to cover execution costs and stabilize the insurance fund.
Why do larger positions have higher margin requirements?
To reduce systemic risk. Large positions can cause price slippage during liquidation; higher margins act as a buffer to protect market integrity.
Can I appeal a liquidation decision?
OKX’s liquidation process is fully automated and based on real-time risk metrics. There is no appeals process, so proactive risk management is crucial.
Does OKX warn users before liquidation?
While real-time alerts may be available via app or email, traders are ultimately responsible for monitoring their accounts. Relying solely on notifications is not recommended.
Final Thoughts
Tiered maintenance margin ratios are a cornerstone of responsible leveraged trading. By adjusting requirements based on position size and account mode, platforms like OKX help maintain market stability—even during sharp price swings.
To stay safe:
- Understand your position tier and corresponding margin needs
- Avoid concentrating large exposures in single pairs
- Regularly review your equity and leverage levels
👉 Stay ahead of liquidation risks with real-time margin monitoring tools.
Remember: leveraged trading amplifies both gains and losses. Always assess whether such strategies align with your risk tolerance and financial goals.