A collateral haircut is the discount an exchange applies to the market value of non-cash assets posted as margin, and understanding how it works is essential for anyone using cross-margin or unified margin accounts to trade crypto perpetuals.
How exchange collateral haircuts work
Cross-margin and unified margin systems let traders deposit assets like BTC, ETH, or SOL as collateral rather than only stablecoins. Because those assets can swing sharply in price, exchanges do not count their full market value toward available margin. Instead they apply a haircut, a percentage discount that reflects how volatile and liquid that asset is considered to be.
The danger of double-sided liquidation
Holding altcoin collateral while using it to open long perpetual positions creates a compounding risk. As the broader market drops, the long position loses money at the same time the collateral backing it is also losing value, which shrinks the account's buffer from two directions at once. Exchanges often raise haircut tiers during periods of high volatility precisely when this is happening, which can push positions into liquidation faster than a trader expects, even if the position itself hasn't moved as far against them as it seems.
A simple illustration
Consider a trader with $20,000 in SOL collateral at a 30 percent haircut, giving $14,000 of usable margin. If volatility spikes and the exchange raises the haircut to 45 percent while SOL also drops 10 percent, usable margin can fall by nearly a third almost overnight, even though the trader made no new trades.
Best practices for collateral management
- Keep the account's initial margin ratio below roughly 50 percent of total available collateral.
- Post primary collateral in fiat-backed stablecoins such as USDC rather than volatile altcoins where possible.
- Set automated alerts for when maintenance margin usage exceeds around 65 percent, so action can be taken before a forced liquidation.