Portfolio Margin
The Formal Definition
A risk-based margin methodology that calculates collateral requirements by stress-testing an entire portfolio against net risk, rather than applying fixed margin percentages to individual positions.
Margin Requirement = Max Portfolio Loss Under TIMS Stress Scenario (±8% to ±15%)
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Reg T margin treats every position in a silo, forcing 50% collateral on stocks. Portfolio margin looks at your net mathematical risk. If you hold long stock hedged with put options, your required capital drops dramatically, freeing up massive buying power."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: $150,000 hedged equity and index options portfolio
| Execution Metric | Portfolio Margin Account (IBKR) | Standard Reg T Account |
|---|---|---|
| Fee / Rate | $110,000 account equity requirement | $2,000 equity minimum |
| Spread / Buffer | Net risk stress-tested at 15% | Fixed 50% initial margin rule |
| Execution / Status | Required margin: $22,500 (6.6x effective leverage) | Required margin: $75,000 (2.0x max leverage) |
| Total Cost / Result | Maximum collateral deployment | Trapped in rigid margin limits |
How Brokers Weaponize This Term
Retail apps rarely support Portfolio Margin because they lack real-time risk simulation engines (TIMS), trapping sophisticated hedgers in high-margin accounts where borrowing rates are marked up.
Broker Evaluation Matrix
Cole Approves
Interactive Brokers: Automated real-time Portfolio Margin engine with live TIMS risk modeling.
Read Audit →Cole Flags / Avoids
Simplified Retail Brokers: Restricts accounts to rigid Reg T 50% margin rules regardless of net hedges.
View Trap Details →Frequently Asked Questions
What is the minimum balance required for Portfolio Margin in the US?
Under FINRA rules, brokers require a minimum net account equity of $110,000 to qualify for Portfolio Margin.
Can Portfolio Margin cause faster liquidations?
Yes. Because leverage can reach 6:1 or higher, sudden out-of-model market shocks can trigger rapid automated margin liquidation.