Maintenance Margin: Definition and Comparison to Margin Accounts

What Is Maintenance Margin?

Maintenance margin is the minimum equity an investor must hold in the margin account after the purchase has been made; it is currently set at 25% of the total value of the securities in a margin account as per Financial Industry Regulatory Authority (FINRA) requirements.

Key Takeaways

  • Maintenance margin is the minimum amount of equity that an investor must maintain in the margin account after the purchase has been made.
  • Maintenance margin is currently set at 25% of the total value of the securities in a margin account as per FINRA requirements.
  • The investor may be hit with a margin call if the account equity falls below the maintenance margin threshold which may necessitate that the investor liquidate positions until the requirement is satisfied.

Understanding Maintenance Margin

Although FINRA requires a 25% minimum maintenance margin, many brokerage firms may require that as much as 30% to 40% of the securities' total value should be available. Maintenance margin is also called a minimum maintenance or maintenance requirement.

A margin account is an account with a brokerage firm that allows an investor to buy securities including stocks, bonds or options—all with cash loaned by the broker. All margin accounts, or purchasing securities on margin, have strict rules and regulations. The maintenance margin is one such rule. It stipulates the minimum amount of equity—the total value of securities in the margin account minus anything borrowed from the brokerage firm—that must be in a margin account at all times as long as the investor holds on to the securities purchased.

So if an investor has $10,000 worth of equity in their margin account, they must maintain a minimum amount of $2,500 in the margin account. If the value of their equity increases to $15,000, then the maintenance margin also rises to $3,750. The investor is hit with a margin call if the value of securities falls below the maintenance margin.

Margin trading is regulated by the federal government and other self-regulatory agencies in an effort to mitigate potentially crippling losses for both investors and brokerages. There are multiple regulators of margin trading, the most important of which are the Federal Reserve Board and FINRA.


Maintenance Margin

Margin Accounts vs. Maintenance Margins

Investors and brokerage firms must sign an agreement before opening a margin account. According to the terms of the agreement set forth by FINRA and the Federal Reserve Board, the account requires a minimum margin be met before investors can trade on the account. The minimum or initial margin must be at least $2,000 in cash or securities.

The Federal Reserve Board’s Regulation T (Reg T) sets a limit on how much an investor can borrow, which is up to 50% of the price of the security purchased. Some brokers require more than a 50% deposit from the investor.

Once an investor buys a security on margin, the maintenance margin goes into effect with FINRA requiring that at least 25% of the total market value of the securities be in the account at all times. Still, many brokers can require more as stipulated in the margin agreement.

If the equity in a margin account falls below the maintenance margin, the broker issues a margin call, which requires that the investor deposit more cash into the margin account bring the level of funds up to the maintenance margin or liquidate securities in order to fulfill the maintenance amount. The broker reserves the right to sell the securities in a margin account, sometimes without consulting the investor, to meet the maintenance margin. Typically the investor will receive a warning from their broker first, and only upon continued failure to pay the margin call will action be taken. A Federal Call is a special kind of margin call issued by the federal government.

Maintenance minimums also eliminate some of the risk to the brokerage in case the investor defaults on the loan.

Maintenance margins, margin calls, Reg T and FINRA regulations all exist because margin trading has the potential to incur skyrocketing gains—as well as colossal losses. Such losses are a huge financial risk, and if left unchecked can unsettle the securities markets, as well as potentially disrupt the entire financial market.

Article Sources
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  1. Financial Industry Regulatory Authority. "Margin Account Requirements."

  2. TD Ameritrade. "Margin Handbook," page 5.

  3. Electronic Code of Federal Regulations. "Title 12: Banks and Banking. Chapter II - Federal Reserve System. Subchapter A. Part 220 - Credit by Brokers and Dealers (Regulation T)."

  4. U.S. Securities and Exchange Commission. "Margin: Borrowing Money to Pay for Stocks."

  5. TD Ameritrade. "Margin Handbook," Page 4.

  6. Nasdaq. "Federal Margin Call."

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