What Is Margin?
Margin is the collateral (typically USDT or the traded asset) that a trader deposits to open a leveraged position. It acts as a security deposit — if the position moves against you, losses are deducted from your margin. If your margin drops below the maintenance requirement, the position is liquidated.
How Margin Works
Two main margin modes exist:
- Isolated Margin — Each position has its own margin. If liquidated, you lose only the margin assigned to that trade.
- Cross Margin — Your entire account balance serves as margin for all positions. Higher liquidation buffer, but a losing trade can drain your whole account.
Initial margin is the amount required to open a position. Maintenance margin is the minimum required to keep it open.
Why It Matters for Traders
Understanding margin mechanics prevents catastrophic losses. New traders often use cross margin without realizing a single bad trade can wipe their account. Isolated margin limits downside to the amount allocated to each trade. Professional risk management always starts with margin mode selection and sizing margin relative to account equity.
How It Works on CEX Perps
On centralized perpetual futures venues, margin shows up in the position panel, the funding timer, or the liquidation engine rather than as a separate product. Traders usually check it next to mark price, margin mode, and open interest so they do not size a trade from last price alone.
Example numbers only (not a live quote): if you hold a $10,000 notional long with 5x leverage, your initial margin is about $2,000. A move against you of roughly 20% of that notional can push the position near maintenance margin depending on the venue formula. Always read the venue's own liquidation rule before you size.
Formula and Worked Example
Use this only as a labeled example. It is not a live market print.
- Notional = coin size × mark price.
- Initial margin ≈ notional ÷ leverage.
- Distance to liquidation depends on maintenance margin, fees, and whether you use cross or isolated margin.
Example: 0.1 BTC long, mark $60,000, leverage 10x → notional $6,000, initial margin about $600. If maintenance margin is near 0.5% of notional, a modest adverse move can close the trade even when your thesis is still intact.
Common Mistakes
- Treating a single print of margin as a trade signal without checking funding, open interest, and your liquidation price.
- Mixing venue conventions (coin-margined vs USDT-margined, cross vs isolated) and reading the wrong mark.
- Copying example numbers from a glossary into live size without checking the current book depth and fee schedule.
- Ignoring related terms that change the meaning of the print on a given day.
