PolymarketDocumentation/docs/perps/learn-about-trading/margin.md

Documentation Index

Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt Use this file to discover all available pages before exploring further.

Margin

Initial margin, maintenance margin, and equity calculations

Margin is the collateral required to open and maintain leveraged positions. It ensures traders have enough collateral to cover potential losses and gives the system a buffer to close positions before they become insolvent.

There are two thresholds. Initial margin (IM) is the collateral required to open or increase a position. Maintenance margin (MM) is the minimum collateral required to keep a position open. When equity drops below maintenance margin, the position is liquidated.

Equity

Equity is the real-time value of an account, incorporating all open positions at current Mark Price.

Equity = Collateral + UnrealizedPnL(Mark) - FeesDue - FundingDue

Unrealized PnL

Long PnL = PositionSize * (Mark - EntryPrice)
Short PnL = PositionSize * (EntryPrice - Mark)

Because equity depends on Mark Price, equity follows live mark updates. See Mark Price.

Margin Requirements

IM = Notional / L_max
MM = Notional / L_maint

Margin requirements scale with position size through leverage tiers. Larger positions require proportionally more margin. Margin is calculated incrementally across tiers, so a position spanning two tiers uses the lower tier's rate on notional up to its upper bound and the next tier's rate on the remainder.

Margin requirements are static across sessions.

Margin States

An account is always in one of three states.

State	Condition	What Happens
Healthy	Equity >= IM	Normal trading
Margin call	MM <= Equity < IM	Can only reduce exposure or deposit collateral
Liquidation	Equity < MM	The system begins closing the position

Margin Checks

Pre-Trade

Before any order executes, the system verifies the account can afford it:

1. Compute the new position after the order fills.
2. Calculate required initial margin using the market's leverage tiers.
3. Reject the order if equity is below required initial margin.

This prevents accounts from entering a margin-call state through new trades.

Continuous Monitoring

The system continuously evaluates accounts:

• If equity falls below maintenance margin, liquidation begins.
• If equity is between maintenance margin and initial margin, the account may enter reduce-only mode.

Deposits and Withdrawals

Deposits increase equity. A deposit during margin call can restore the account to healthy status immediately.

Withdrawals require the account to remain above required initial margin after the withdrawal. You cannot withdraw yourself into a margin call.