For experienced traders looking to maximize capital efficiency, portfolio margin can be a game-changer. By calculating margin based on the overall risk of a portfolio rather than individual positions, this approach can significantly lower margin requirements and increase buying power. However, increased leverage also means increased responsibility.
Let’s explore how portfolio margin works, what makes it different from traditional margin, and how to use it wisely in your trading strategy.
What Is Portfolio Margin?
Portfolio margin is a risk-based margining system that evaluates an account’s potential losses using real-time pricing models and stress tests. Instead of setting fixed margin requirements per position, it evaluates the combined risk of all positions held. This can lead to lower margin requirements, especially when positions offset one another.
To qualify, an account generally needs a minimum equity balance of $125,000 and approval for advanced options strategies, including uncovered options. Applicants are usually required to pass a test assessing their knowledge of options and margin risk.
Portfolio Margin vs. Traditional Margin
Traditional margin accounts use set rules, such as requiring 50% of a stock’s value to be held in margin. In contrast, portfolio margin calculates potential losses across a range of market moves using an options pricing model.
For example, if a stock is trading at $50 and 100 shares are held, the traditional margin requirement would be $2,500. Under portfolio margin, the requirement is based on the theoretical loss if the stock drops 15%. In this case, that would result in a $750 margin requirement, allowing for more efficient use of capital.
The Stress Test Behind Portfolio Margin
Portfolio margin relies on a stress test model that simulates price movements—typically plus or minus 15% for individual equities. The model calculates the theoretical profit and loss for each position at multiple points within that range. The margin requirement is based on the largest projected loss across all those scenarios.
If a portfolio includes positions that hedge each other, such as a long stock paired with a short call, the net risk could be lower than the sum of individual risks. As a result, the portfolio margin requirement could be significantly reduced compared to traditional margin.
Real-World Examples of Portfolio Margin 
Short Put Example
A trader sells a 120 naked put for $0.80 on a stock trading at $125. The traditional margin requirement might be around $2,000. Under portfolio margin, the estimated requirement would be about $1,350, based on the theoretical loss if the stock drops 15% to $106.25.
Covered Call Example
A trader buys 100 shares of a stock at $41.35 and sells a 44 call for $0.35. The traditional margin requirement would be $2,032.50, factoring in 50% of the stock’s value minus the call premium. Under portfolio margin, the requirement could be closer to $590, based on the loss from a 15% price drop.
Key Considerations for Portfolio Margin
Portfolio margin can enhance capital efficiency and trading flexibility, but it also carries increased risk. Margin deficiencies must be addressed within a shorter time frame, sometimes as quickly as the same day, depending on market conditions. Accounts with concentrated risk in a single security may face higher requirements than those with diversified positions.
It’s important to understand that while margin can amplify gains, it also magnifies losses. Traders should fully understand how margin works, including maintenance requirements and the potential for liquidation without notice.
Eligibility and Risk Awareness
To apply for portfolio margin, a trader typically needs a minimum account value of $125,000, approval for advanced options trading strategies, and a strong understanding of margin mechanics. Qualification exams are designed to verify the trader’s ability to manage higher levels of risk.
Portfolio margin allows for more strategic flexibility, but it requires careful planning, regular monitoring, and a solid grasp of how risk behaves under various market conditions.
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