An Overview of Excess Equity 

Excess equity, also known as buying power, represents the funds a trader has available to purchase securities in an account. It is calculated as the total cash held in the trading account plus any available margin.

How Excess Equity Works

Excess equity specifically refers to the funds available to investors in a leveraged account to purchase securities. Leveraged accounts, commonly referred to as margin accounts, allow investors to borrow money based on the cash in their brokerage accounts.

Under Regulation T, established by the Federal Reserve Board (FRB), an investor’s initial margin requirement for a margin account must be at least 50%. This means that the trader has two times their equity in excess equity.

Excess Equity in Margin Accounts

The excess equity an investor has in a margin account depends on the brokerage firm’s risk parameters and the investor’s specific profile. Typically, margin accounts offer twice the cash held in the account as excess equity.

While leverage increases excess equity, it also raises the risk of margin calls, making it harder to recover from losses. In non-margin or cash accounts, excess equity equals the cash balance in the account. For example, if an investor has $10,000 in a cash account, their excess equity is limited to $10,000.

Excess Equity in Day Trading Accounts

Excess equity in day trading accounts operates differently than standard margin accounts. These accounts require a minimum equity balance of $25,000, compared to the $2,000 required for standard margin accounts.

In a day trading account, traders only need to fund 25% of the cost of the securities they purchase, giving them four times the equity in excess equity. For instance, if a trader has $50,000 in a day trading account, they could open trades worth up to $200,000 during the trading day ($50,000 × 4 = $200,000).

Example of Excess Equity

Excess equity is accounted for in the following manner: Suppose Alex has $100,000 in a brokerage margin account and wants to purchase shares of Apple Inc. (AAPL). If the broker’s initial margin requirement is 50%, Alex’s total excess equity can be calculated as follows:

Excess Equity = Cash Balance / Initial Margin Percentage

Excess Equity = 100,000 / 50% = 200,000

This means Alex can purchase up to $200,000 worth of Apple shares. However, the value of the margin account will fluctuate with the value of the securities held. If the account approaches its margin limits, Alex could face a margin call.

Conclusion

Excess equity refers to the total amount of money an investor has available to purchase securities, which is calculated as the sum of cash in their brokerage account plus any available margin. In a standard margin account, investors typically have access to two times their equity as excess equity, while pattern day trading accounts offer even greater leverage, providing four times the equity as excess equity. However, this increased excess equity not only enhances the potential for higher profits but also magnifies the risk of greater losses.