Maintenance margin, as it relates to margin accounts and trading, refers to the necessary amount of funds an investor needs to maintain in their brokerage account in order to utilize margin. Margin accounts work differently than other trading accounts. Instead of allowing the trader to do regular trades, the margin account allows leveraged trades.
This means that the trader can buy securities including stocks, bonds, or options for more than the amount that they have in their account, paying only a deposit on the trade. They borrow the rest of the cash needed for the investment from the broker.
Key Points
• Maintenance margin represents the minimum balance required in a trader’s margin account to avoid a margin call and continue leveraged trading.
• The Financial Industry Regulatory Authority mandates a minimum maintenance margin of 25%, but individual brokerage firms often set higher requirements for added security.
• Margin trading carries significant risks, as traders can incur losses exceeding their account balance, leading to margin debt owed to brokers.
• If a trader’s account balance falls below the maintenance margin, the broker can issue a margin call, requiring additional funds or asset liquidation within a specified timeframe.
• Understanding the distinction between maintenance margin and initial margin is crucial, as the initial margin is the upfront deposit required to open a margin account.
Maintenance Margin Definition
In margin trading, the maintenance margin is the minimum amount of funds that a trader must hold in their portfolio to avoid being issued a margin call, for as long as they are actively involved in a trade. If a trade they enter decreases in value, the trader may owe money, which is taken from their account.
Minimum margin requirements for leveraged accounts are regulated by the government. Currently the Financial Industry Regulatory Authority (FINRA) sets the maintenance margin at 25% of the total value of securities that a trader holds in their margin account.
Specific brokerage firms also maintain their own requirements. It is common for brokerage requirements to be higher than the government required amount to provide the firm with greater financial security.
Margin maintenance requirements shift based on various factors, including market liquidity and volatility. And different stocks have differing maintenance requirements: if they are more likely to be volatile, the requirements may be higher.
Does a Maintenance Margin Mitigate Risk?
Maintenance margin doesn’t mitigate risk for traders. Margin investing is risky because traders can lose more money than they have in their account, creating a debt with the broker, called margin debt.
When a trader opens a margin account, they must sign an agreement and deposit a certain amount into the account before they can start trading. To pay off any debt from assets that have lost value, the trader will need to deposit additional funds, deposit securities, or sell off holdings.
Therefore, margin trading isn’t recommended for beginner traders, and it’s important for traders to understand the risks and how it works before trying it out.

đź’ˇ Quick Tip: When you’re actively investing in stocks, it’s important to ask what types of fees you might have to pay. For example, brokers may charge a flat fee for trading stocks, or require some commission for every trade. Taking the time to manage investment costs can be beneficial over the long term.
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Maintenance Margin Requirement Examples
Let’s look at an example of how maintenance margin requirements work.
Let’s say a trader wants to purchase 100 shares of Company XYZ at $40 per share. They don’t have sufficient funds to purchase the entire number of shares. The trader can use a margin account which allows them to purchase the entire amount of shares but only deposit a percentage of the total price into the trade and also pay a financing fee. This deposit amount is known as the initial margin requirement.
In this example, the initial maintenance margin requirement is 40% of the purchase price of the trade. For the trader to purchase the full 100 shares, they need to maintain a balance of 40% of the trade purchase amount in their margin account.
When Maintenance Margin Requirements Aren’t Met
If the amount in their account dips below the minimum requirement, their broker will issue a margin call notification. Generally, the trader will have between 2-5 days to either add more funds to their account or sell some of the assets they are invested in to move enough cash funds back into their account.
If the trader doesn’t sell holdings or add funds to their account to meet the margin maintenance requirement, the broker may sell the trader’s securities without notifying them, and they have the right to decide which ones they sell. They are also allowed to charge the trader commissions and even sue the trader for losses.
A margin call can also be sent out if the brokerage firm changes their requirements, which they can do at any time.
Calculating Maintenance Margin
Each brokerage firm has their own maintenance margin requirements. The formula to calculate the maintenance margin is:
Account value = (Margin Loan) / (1 – Maintenance Margin %)
This can be used to determine the stock price that will trigger a margin call.
For example, a trader opens a margin account and deposits $20,000 into it, then borrows $10,000 from the broker in a margin loan in order to purchase 200 shares of stock at a price of $100 each. The broker’s maintenance margin is 30%. Here is what the calculation would be to figure out what account balance would trigger the margin call:
($10,000 Margin Loan) / (1 – 0.30 Maintenance Margin %) = $14,285.71
That means that if the trader’s account dips below $14,285.71, or if the price of the stock falls below $71.43 ($14,285.71 / 200 shares) then the broker will issue a margin call.
Recommended: What Is Margin Interest and How to Calculate It
Maintenance Margin vs Initial Margin
When traders open a margin account, there is an initial margin amount they are required to deposit before they can start trading. This is set by FINRA, and brokers may also have their own additional requirements. The initial margin required by FINRA is currently $2,000 in cash or securities.
After a trader starts buying on margin, they must meet the maintenance margin on their account — at least 25% of the market value of the securities in their account.
The Takeaway
A maintenance margin is a monetary buffer for traders with margin accounts. The maintenance margin is a minimum balance required to execute leveraged trades. If a trader’s margin account dips below the minimum set by FINRA and the broker, the broker will issue a warning, or margin call, so that the trader can add cash to their account or sell holdings to cover the gap.
Maintenance margins do not mitigate risks for traders, and if an investor is utilizing margin as a part of their investment strategy, they should know what they’re getting into. Margin accounts have their pros and cons, but it’s important to keep the risks in mind.
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FAQ
What happens if you go below maintenance margin?
Generally, if a trader or investor’s account goes below the maintenance margin, their brokerage will send them a margin call, or otherwise warn them that they need to deposit funds or sell holdings.
What does current maintenance margin mean?
Current maintenance margin refers to the literal current maintenance margin set by financial regulators or by a specific brokerage. For example, it may be 25% of the value of an investor’s total holdings.
What is the difference between maintenance margin and minimum margin?
Minimum margin refers to the minimum amount of collateral needed in a margin account to execute leveraged trades, while maintenance margin is the total capital that needs to remain in the account as the investor continues to utilize a margin account.
Who sets the maintenance margin?
FINRA currently sets the maintenance margin, which is 25%. But specific brokerage firms can set their own beyond that, and often, at a higher threshold.
Why is my maintenance margin so high?
Maintenance margin requirements can be determined by a number of factors beyond regulatory minimums, such as market conditions and volatility, and the specific types of securities an investor is trading.
What does 25% maintenance margin mean?
Twenty-five percent maintenance margin means that an investor must hold 25% of the total value of their holdings in their account. It is the minimum amount of equity that must be maintained in their margin account.
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