Derivatives Journal

Crypto Derivatives

Liquidation Mechanics in Crypto Derivatives: How Forced Closures Work

How liquidation actually works in crypto perpetual futures, maintenance margin, partial liquidation, insurance fund, ADL, and how to avoid getting wrecked.

January 20, 2026

Contents

Liquidation is the mechanism that protects exchanges from default risk on leveraged positions. It is also the mechanism that wipes out unprepared traders. Understanding exactly how liquidation works, what triggers it, how it executes, and what the exchange does when liquidation is not enough, separates traders who survive from those who repeatedly blow up. This guide walks through the chain of events on the major venues.

The trigger: maintenance margin

Every leveraged position carries two margin numbers:

  • Initial margin, the collateral required to open the position.
  • Maintenance margin, the minimum collateral required to keep the position open.

Maintenance margin is always lower than initial margin. As a position moves against the trader, unrealised losses reduce account equity. When equity falls below maintenance margin, liquidation triggers.

The maintenance margin requirement scales with notional size. Larger positions face higher maintenance margin tiers. A 100 BTC perp may require 1% maintenance margin, while a 1,000 BTC perp may require 2% or more. Tier tables are published on every venue's contract specifications.

Partial liquidation

Most major venues use partial liquidation as the first response. Instead of closing the entire position, the exchange closes part of it, enough to bring the account back above maintenance margin. The remaining position continues to trade.

The benefit: traders get a second chance. A position that triggers a partial liquidation but then recovers can survive with reduced size.

The drawback: the partial close happens at the mark price, not at any price the trader sees on the book. In fast markets, this can be substantially worse than the displayed best bid/offer.

Full liquidation

If partial liquidation does not bring the account above maintenance margin (or if the venue does not support partial liquidation for the contract), the position is fully closed. The exchange takes over the position and closes it on the open market or hands it to the insurance fund.

The trader's account is debited by the loss. In isolated margin mode, the loss is capped at the isolated collateral. In cross margin mode, the loss can extend to the full account balance, and beyond, into the insurance fund, in extreme cases.

The insurance fund

When a liquidated position closes at a worse price than the maintenance margin level, the exchange covers the gap from the insurance fund. The insurance fund accumulates over time from a fraction of liquidation fees and acts as a buffer between defaulted traders and counterparty risk on the platform.

Insurance fund balances are public. Coinglass and similar aggregators show insurance fund history for the major venues. A persistently growing insurance fund is healthy; a depleting fund signals stress.

Auto-deleveraging (ADL)

When the insurance fund is exhausted and a liquidated position cannot be closed at the mark price, ADL kicks in. The exchange forcibly closes profitable opposing positions on the other side of the market to absorb the bad debt.

ADL is the worst-case outcome for a profitable trader: a winning position is closed against the trader's will, often at a price that captures less of the move than the trader expected. ADL is rare in normal markets but appears during severe stress events (March 2020 covid crash, FTX collapse week, major liquidation cascades).

ADL ranking is typically calculated as profit% × leverage. The most profitable, highest-leverage positions get deleveraged first. Reducing leverage on a winning position can move the trader down the ADL queue.

Liquidation cascades

A single liquidation moves the price slightly. Many liquidations at once move it materially. When prices move materially, more positions hit their liquidation triggers, which feed the cascade. The result is the violent flash moves that crypto traders know well.

Liquidation cascades can be one-directional (a long squeeze or a short squeeze) and last anywhere from seconds to hours. During a cascade:

  • Spreads widen dramatically.
  • Mark price diverges from index price.
  • Stop loss orders execute at far worse than expected prices.
  • Cross margin accounts can lose multiple positions simultaneously as account equity collapses.

Mark price vs last price

Liquidation is typically based on mark price, not last traded price. Mark price is computed from a weighted index of multiple spot exchanges plus a moving average of the perp. The intent is to prevent manipulation: a trader cannot wash-trade the perp orderbook to trigger competitor liquidations because the mark price stays anchored to the broader market.

Most venues display both prices. Liquidation alerts and risk monitoring should be based on mark price.

Practical defence

1. Use isolated margin for high-leverage tactical trades

Isolated margin caps loss to the allocated collateral. Cross margin lets one position drain others.

2. Set leverage low

Most blowups happen at leverage above 10x. The realistic working range is 2-5x for active trading.

3. Use stop losses, but understand their limits

Stop loss orders execute at market when triggered. In fast markets, the fill price can be far worse than the stop level. A stop loss is a discipline tool, not a guarantee.

4. Monitor margin ratio actively

Most venues display a margin ratio, current account equity vs maintenance margin requirement. A ratio approaching 80% means liquidation risk is real. Reduce position size or add collateral.

5. Avoid trading into illiquid contracts at high leverage

Smaller-cap perps have shallower books and worse liquidation execution. Reserve high leverage for the deepest contracts (BTC, ETH USDT-margined perps).

6. Have a margin reserve

Keep at least 20-30% of account in cash. The reserve can be deployed to defend a position that is approaching liquidation, provided the underlying thesis still holds.

Venue-specific notes

Binance Futures

Tier-based maintenance margin scaling. Partial liquidation supported. Insurance fund balance public. ADL rare but possible during major events.

Bybit

Similar mechanics. Bybit's UTA introduces additional cross-product complexity worth understanding before opting in.

OKX

Portfolio margin available for eligible accounts. Cross-product liquidation can be sequenced, e.g., loss-making spot inventory may be liquidated to defend a profitable derivatives position.

Deribit

Portfolio margin standard for many accounts. Liquidation in options portfolios is more complex because each leg's risk depends on the others.

When liquidation is the right outcome

A liquidation is not always a failure. If the trader's stop loss did not get hit (price gapped through), the liquidation can be the cleanest exit available. The lesson is to size positions so that even a liquidation does not threaten account-level survival, and to learn from the trade that triggered it.