What Is Margin Trading? How Buying Stocks on Margin Works and What Investors Need to Know

What if you could buy more stocks than the cash currently available in your brokerage account?

That is the basic idea behind margin trading.

Instead of paying for an entire stock purchase with your own money, you borrow part of the purchase price from your brokerage firm. Your securities and other assets in the account serve as collateral for the loan.

Margin can increase your purchasing power, but it also magnifies the financial consequences of a market move in the wrong direction. A 10% decline in the stock you purchased does not necessarily mean a 10% decline in your own capital. Because part of the position was financed with borrowed money, the percentage loss on your equity can be substantially larger.

There is another important difference between margin investing and ordinary stock investing: you owe the borrowed money even if the investment loses value.

This guide explains what margin trading is, how buying stocks on margin works, how much you can borrow, how margin interest works, what a margin call is, why brokers can liquidate positions, and what investors should understand before using leverage.

What Is Margin Trading?

Margin trading is the practice of purchasing securities with a combination of your own capital and money borrowed from a brokerage firm.

A simple example makes the concept easier to understand.

If the stock rises, the return on your own capital can be amplified.

But if the stock falls, the loss on your equity can also be amplified.

In addition, the $10,000 margin loan remains outstanding. You also pay interest on that borrowed amount according to your broker’s margin rate.

Investor.gov defines a margin account as a brokerage account in which the broker-dealer lends the investor cash using securities and other account assets as collateral.

Margin Account vs. Cash Account

Before understanding margin trading, it is essential to distinguish a margin account from a cash account.

Feature	Cash Account	Margin Account
Borrowing from broker	No	Yes
Purchasing power	Based primarily on available cash	Can exceed available cash
Interest expense	No margin loan interest	Yes, when borrowing occurs
Leverage	No borrowing leverage	Yes
Potential loss	Generally limited to invested capital	Can exceed initial cash contribution
Margin call	No	Possible
Forced liquidation	Not due to a margin deficiency	Possible

In a cash account, you generally pay the full amount for securities you purchase. In a margin account, your broker can lend you money to purchase securities, with the account serving as collateral.

If you are still building your first investment portfolio, our guide on how much money you need to start investing explains why you do not need leverage to begin investing.

How Does Margin Trading Work?

The process can be broken down into several steps.

Step 1: Open a Margin Account

First, you need a brokerage account that permits margin trading.

Opening a margin account generally involves signing a margin agreement that explains the terms of borrowing, interest charges, collateral requirements and other conditions.

FINRA requires firms to provide non-institutional customers with a margin disclosure statement before or when opening a margin account.

Step 2: Deposit Your Own Capital

You contribute cash and/or eligible securities to the account.

This represents your initial equity in the transaction.

Step 3: Borrow From the Brokerage Firm

The broker provides financing based on the applicable margin requirements.

The amount you can borrow depends on the securities involved, regulatory requirements and the brokerage firm’s own rules.

Step 4: Purchase the Securities

You use the combined amount of your own capital and borrowed funds to purchase securities.

Step 5: Pay Interest on the Margin Loan

The borrowed money is not free.

Your broker charges interest on the margin loan, and that expense reduces your investment return.

SEC investor guidance specifically warns that margin interest directly reduces investment returns and increases the return an investment must generate just to break even.

Step 6: Repay the Loan

When you sell the securities or otherwise repay the loan, the borrowed principal and accumulated interest must be settled according to the terms of the account.

How Much Can You Borrow to Buy Stocks?

This is one of the most important questions in margin investing.

In the United States, Regulation T generally requires 50% initial margin for purchases of marginable equity securities. This means that, under the general framework, an investor can initially finance up to roughly half of an eligible purchase with borrowed funds, subject to the security and broker’s requirements.

For example:

Investor Capital	Potential Borrowing	Illustrative Position
$5,000	$5,000	$10,000
$10,000	$10,000	$20,000
$25,000	$25,000	$50,000

These are simplified illustrations rather than a guarantee of available buying power. Brokerage firms can impose higher requirements, and not every security is eligible for margin financing.

What Is Initial Margin?

Initial margin is the amount of equity you must provide when establishing a margin position.

For example, suppose you want to purchase $20,000 of an eligible stock and the applicable initial margin requirement is 50%.

Component	Amount
Total stock purchase	$20,000
Your capital	$10,000
Margin loan	$10,000

The securities are then part of the collateral supporting the margin loan.

What Is Maintenance Margin?

Initial margin is only the beginning.

Once you own securities using borrowed money, you must maintain sufficient equity in the account. This is known as the maintenance margin requirement.

Under FINRA’s general framework, the maintenance requirement for long equity positions is generally at least 25% of current market value, although brokerage firms can establish higher “house” requirements. FINRA notes that firms may set maintenance requirements of 30%, 40%, or higher depending on the security and circumstances.

This distinction is critical because the broker’s actual requirement may be higher than the regulatory minimum.

What Is a Margin Call?

A margin call occurs when the equity in your margin account falls below the required level.

This can happen because:

• The stock price falls.
• The value of other securities in the account falls.
• The brokerage firm raises its house margin requirement.
• The security becomes substantially more volatile or difficult to liquidate.

When a margin deficiency occurs, the broker can require you to deposit additional cash or eligible securities.

Importantly, investors should not assume that they will always receive a long grace period before liquidation. Investor.gov states that a brokerage firm may sell securities in a margin account to cover a shortfall and may do so without informing the investor in advance.

Margin Call Example

Suppose you purchase $20,000 of stock using:

• $10,000 of your own money
• $10,000 borrowed from the broker

Initially:

Equity = $20,000 − $10,000 = $10,000

Now imagine the stock falls to $14,000.

Your loan is still approximately $10,000 before interest and other adjustments.

Therefore:

Equity = $14,000 − $10,000 = $4,000

If the broker requires 30% maintenance equity, you would need:

$14,000 × 30% = $4,200

Your $4,000 equity would therefore be below the requirement.

The broker could require additional collateral or liquidate securities according to the terms of the account.

Why Can a Broker Sell Your Stocks Without Waiting?

This is one of the biggest differences between margin investing and traditional cash investing.

The securities in your margin account serve as collateral for the loan.

If their value falls enough to create a margin deficiency, the brokerage firm has an interest in protecting the amount it has lent.

Investor.gov specifically warns that a brokerage firm may sell some or all securities in a margin account to cover a shortfall and that the investor may not get to choose which securities are sold.

That means a margin investor can be forced to sell during a market decline.

This creates an additional risk beyond the normal risk of owning stocks:

You may be forced to sell when prices are falling.

How Margin Magnifies Returns and Losses

Leverage works in both directions.

If the Stock Goes Up

Suppose you invest $10,000 of your own money and borrow another $10,000.

You purchase $20,000 of stock.

If the stock rises 20%, the position becomes $24,000.

Ignoring interest, commissions, taxes and other costs:

$24,000 − $10,000 loan = $14,000 equity.

You started with $10,000 and now have $14,000.

Your equity increased by 40%, even though the stock increased by 20%.

If the Stock Falls

Now imagine the stock falls 20%.

The $20,000 position becomes $16,000.

After repaying the $10,000 loan, you have $6,000.

Your $10,000 equity has fallen to $6,000—a 40% decline.

Stock Movement	Stock Position	Investor Equity	Approx. Equity Change
Initial	$20,000	$10,000	—
+20%	$24,000	$14,000	+40%
-20%	$16,000	$6,000	-40%

This is the essence of leverage.

It amplifies the percentage impact of price movements on your own capital.

Margin Interest: The Cost Investors Often Underestimate

One of the most important costs of margin trading is interest.

Suppose you borrow $20,000 at a hypothetical annual interest rate of 9%.

The approximate annual interest cost would be:

$20,000 × 9% = $1,800

If your investment generates a 6% return during the same period, the gross investment gain would be:

$20,000 × 6% = $1,200

You would therefore have a negative spread of approximately $600 before considering taxes, commissions and other costs.

This demonstrates why the correct question is not simply:

“Can the stock rise?”

The more relevant question is:

“Can the expected return reasonably exceed the financing cost and compensate me for the additional risk?”

Margin interest rates vary between brokers and can change over time. Investors should always check the current rate applicable to their account rather than relying on an illustrative rate.

What Happens If the Stock Falls 50%?

Consider a more severe hypothetical scenario.

You have $10,000 of your own capital and borrow $10,000 to buy $20,000 of stock.

If the stock falls 50%, the position becomes worth $10,000.

You still owe approximately $10,000 to the broker, excluding interest.

Your equity could therefore be reduced to approximately zero.

Item	Amount
Original stock position	$20,000
Investor capital	$10,000
Margin loan	$10,000
After 50% stock decline	$10,000
Loan outstanding	$10,000
Remaining equity before costs	$0

In real-world margin accounts, a broker may liquidate the position before losses reach this point because maintenance requirements must be satisfied.

This is why investors can face a margin call well before a position loses 50%.

Can You Lose More Than You Invested?

Yes.

This is one of the most important risks of margin trading.

If the value of your securities falls substantially, the proceeds from selling those securities may not be enough to repay the margin loan and associated costs.

The investor can therefore remain responsible for a debt even after the securities have been sold.

The SEC explicitly warns that investors using margin can lose more money than they initially invested.

What Is Buying Power?

Buying power refers to the amount of securities you may be able to purchase based on the cash, eligible securities and applicable margin rules in your account.

Margin increases purchasing power because the broker is financing part of the transaction.

For example, if you have $25,000 of eligible equity and a 50% initial margin requirement applies, the general framework could support a $50,000 purchase.

But investors should not automatically treat the maximum displayed buying power in an app as an amount they should use.

Maximum borrowing capacity and prudent borrowing capacity are two different concepts.

Margin Trading and Diversification

Leverage can make diversification more complicated.

Suppose an investor has $50,000 and borrows another $50,000.

If the entire $100,000 is invested in one stock, the investor faces both:

• Concentration risk
• Leverage risk

If the $100,000 is spread across a diversified portfolio, company-specific risk may be lower, but leverage risk remains.

This distinction matters.

Diversification can reduce certain investment risks, but it does not eliminate the risks associated with borrowing.

For investors who want to build a portfolio without leverage, our guide on how long-term investors think explores the role of time, discipline and portfolio construction.

Margin Trading vs. Investing With Your Own Cash

Factor	Cash Investing	Margin Investing
Capital source	Investor’s own money	Own money + borrowed funds
Leverage	No	Yes
Interest cost	No margin loan	Yes
Potential return on equity	Linked to asset return	Can be amplified
Potential loss on equity	Generally limited to invested capital	Can exceed initial capital
Margin call	No	Possible
Forced liquidation	Not due to margin deficiency	Possible

Margin Trading vs. Stock Lending

Because these concepts are often confused, it is useful to distinguish them clearly.

Feature	Margin Trading	Stock Lending
Who borrows?	Investor borrows money	Market participant borrows securities
What is borrowed?	Cash	Stocks or other securities
Main objective	Increase purchasing power	Facilitate short selling, settlement, market making or other activities
Investor pays	Margin interest	Usually no borrowing cost for the lender; compensation may be received
Main investor risk	Leverage and margin calls	Counterparty, voting-right, dividend/tax and program risks

If you want to understand the other side of securities borrowing, read our guide on stock lending and securities lending.

What Is the Difference Between Margin Trading and Short Selling?

Margin trading is broader than short selling.

An investor can use a margin account to purchase securities with borrowed money.

Short selling involves selling securities that the investor does not own, typically after borrowing them through the brokerage infrastructure.

Short selling also involves margin requirements and securities borrowing costs.

Investor.gov explains that short sales are generally settled through delivery of borrowed securities and that short sellers are subject to margin rules and other applicable costs.

For a detailed explanation, see our guide to how short selling works.

When Can Margin Trading Become Particularly Dangerous?

Several situations can increase the risk significantly.

1. Highly Volatile Stocks

Large daily price swings can quickly reduce account equity.

2. Concentrated Positions

Borrowing money to buy one or two stocks creates a combination of leverage and concentration risk.

3. High Margin Interest Rates

Higher financing costs increase the return required to break even.

4. Rapid Market Declines

Sharp market declines can trigger margin calls and forced liquidation.

5. Insufficient Cash Reserves

If you cannot meet a margin call, the broker may liquidate securities.

6. Using Maximum Available Leverage

The fact that a broker allows a certain amount of borrowing does not mean that amount is appropriate for every investor.

What Happens During a Market Crash?

Margin risk becomes particularly visible during broad market sell-offs.

Imagine an investor who has:

• $100,000 of their own capital
• $50,000 borrowed from a broker
• $150,000 invested in stocks

If the portfolio falls 30%, its value drops to $105,000.

The investor still owes approximately $50,000.

Equity therefore falls to approximately $55,000 before interest and other adjustments.

The investor has lost 45% of their original $100,000 capital even though the underlying portfolio declined by 30%.

If the decline continues, the account can approach maintenance requirements and potentially trigger a margin call.

This is one reason why investors should consider their ability to withstand large market declines before using leverage.

Our guide on what to do when the stock market falls explains the broader behavioral and portfolio-management issues that arise during market declines.

Can a Broker Increase Margin Requirements?

Yes.

Brokerage firms can impose house margin requirements that are higher than regulatory minimums.

FINRA notes that firms may increase their requirements for particular securities or groups of securities, including during periods of high volatility or other elevated risk.

This creates an important risk:

You could face a margin deficiency even if you did not make a new trade.

For example, if a broker increases the maintenance requirement on a highly volatile stock, your existing equity may no longer be sufficient.

What Is a House Margin Requirement?

A house margin requirement is a brokerage firm’s own margin requirement.

Regulators establish minimum standards, but brokers can impose stricter requirements.

For example, the general FINRA maintenance requirement for a long equity position is 25%, but a broker may require 35%, 40% or more for a particular security.

Requirement Type	Meaning
Regulatory minimum	Minimum standard established by applicable rules
House requirement	Broker’s own, potentially stricter requirement
Special requirement	Higher requirement for certain securities or market conditions

Should You Use Stop-Loss Orders With Margin?

Some investors use stop-loss orders as part of their risk-management process.

A stop order can potentially help automate an exit when a specified price level is reached.

However, investors should understand that a stop-loss order does not guarantee a particular execution price. In a rapidly moving or illiquid market, the actual execution price can differ materially from the trigger price.

Therefore, a stop-loss should not be treated as a complete solution to margin risk.

More important is understanding:

• How much you are borrowing
• How much equity you maintain
• How much the stock can reasonably fluctuate
• How much interest you are paying
• What your broker’s maintenance requirements are
• How much liquidity you have available to meet a margin call

A Realistic Margin Trading Example

Consider Daniel, a hypothetical investor with $30,000 in available capital.

He decides to purchase $60,000 of a diversified stock portfolio using $30,000 of his own capital and $30,000 borrowed from his broker.

The portfolio initially rises 15%.

The $60,000 position becomes $69,000.

After subtracting the $30,000 loan, Daniel has approximately $39,000 of equity before interest and other costs.

His original $30,000 capital has increased to $39,000, a 30% increase.

But imagine instead that the portfolio falls 15%.

The position becomes $51,000.

After subtracting the $30,000 loan, Daniel has approximately $21,000.

His original $30,000 capital has fallen by 30%.

The underlying portfolio moved 15%.

His equity moved approximately twice as much in percentage terms because he used 2-to-1 gross exposure.

Interest expenses would further affect the result.

What Should You Check Before Using Margin?

Margin Trading and Long-Term Investing

Margin is often associated with active trading, but the financing mechanism itself does not determine an investor’s time horizon.

An investor can technically hold a margin-financed position for an extended period.

The challenge is that the investor must continue paying interest and maintaining sufficient account equity throughout the holding period.

This creates a significant difference between time in the market and time financed with borrowed money.

A long-term investor may benefit from allowing investments to compound over many years, but borrowing costs can work in the opposite direction.

If you are building wealth over a long horizon, our guide on building savings and financial reserves explains why a strong financial foundation can be more important than maximizing short-term purchasing power.

Margin Trading and Debt Management

Margin borrowing is still debt.

That means it should be analyzed with the same discipline you would apply to other forms of borrowing.

For example, consider an investor who has:

• High-interest credit card debt
• No emergency fund
• A margin loan used to buy stocks

The investor is simultaneously carrying expensive personal debt, financial fragility and investment leverage.

Before increasing investment leverage, it is useful to understand the relationship between debt and investing.

The objective should not simply be to maximize the amount of capital invested. It should be to build a financial structure that can survive unfavorable scenarios.

Common Margin Trading Mistakes

Mistake 1: Using the Maximum Available Buying Power

Maximum buying power is not the same as prudent buying power.

Mistake 2: Ignoring Interest

An investment that looks profitable before financing costs may produce a much smaller return—or even a loss—after margin interest.

Mistake 3: Assuming the Broker Will Give You Time

Investors should understand their broker’s liquidation and margin-call procedures rather than assuming they will always receive advance notice.

Mistake 4: Concentrating the Borrowed Money

Using leverage to purchase one highly volatile stock can create substantial downside exposure.

Mistake 5: Confusing a Temporary Decline With a Margin-Safe Position

A long-term investment thesis does not protect a leveraged position from a margin call.

Mistake 6: Borrowing Without a Liquidity Reserve

If a margin call occurs, the investor may need to provide additional cash or securities quickly.

Mistake 7: Treating Leverage as a Shortcut to Wealth

Leverage changes the distribution of possible outcomes; it does not make an investment fundamentally more valuable.

Who Should Understand Margin Trading?

Margin trading is a more advanced feature of brokerage accounts because it combines investment risk with financing risk.

Before using it, an investor should understand:

• Basic portfolio construction
• Market volatility
• Risk management
• Interest costs
• Margin requirements
• Liquidity management
• Tax considerations
• Broker-specific liquidation rules

Investor.gov emphasizes that margin accounts involve substantially greater risks than cash accounts and advises investors to understand the margin agreement and whether margin is appropriate for their financial resources, objectives and risk tolerance.

Frequently Asked Questions About Margin Trading

1. What is margin trading?

Margin trading means purchasing securities using a combination of your own capital and money borrowed from a brokerage firm.

2. What is a margin account?

A margin account is a brokerage account that allows the broker to lend money to the investor, with securities and other account assets serving as collateral.

3. What is the difference between a margin account and a cash account?

A cash account requires the investor to pay the full purchase amount, while a margin account allows borrowing subject to applicable requirements.

4. How much can I borrow when buying stocks on margin?

In the U.S., Regulation T generally sets a 50% initial margin requirement for eligible marginable equity securities, although brokers and securities can have stricter requirements.

5. What is initial margin?

Initial margin is the equity an investor must contribute when establishing a margin position.

6. What is maintenance margin?

Maintenance margin is the minimum level of account equity that must generally be maintained after the position has been established.

7. What is a margin call?

A margin call occurs when account equity falls below the applicable maintenance requirement and the broker requires additional collateral or takes other permitted action.

8. Can a broker sell my stocks without asking me?

Yes. Under the terms and rules governing margin accounts, a broker may liquidate securities to cover a margin deficiency, and investors may not be able to choose which securities are sold.

9. Can I lose more than I invested?

Yes. Margin borrowing can create losses exceeding the investor’s initial cash contribution.

10. Do I pay interest on margin?

Yes. Margin loans carry interest, and that expense reduces investment returns.

11. Can margin interest rates change?

They can. The applicable rate depends on the brokerage firm’s terms and may change over time. Investors should check the current rate and agreement.

12. Can every stock be purchased on margin?

No. Security eligibility depends on regulatory requirements, exchange rules and the brokerage firm’s policies.

13. Can ETFs be purchased on margin?

Many ETFs may be marginable, but eligibility and requirements vary by fund and brokerage firm.

14. Is margin trading the same as short selling?

No. Margin trading can involve buying securities with borrowed money, while short selling involves selling securities that the investor does not own, typically after borrowing them.

15. Does diversification eliminate margin risk?

No. Diversification can reduce certain portfolio risks, but leverage, interest costs and margin-call risk remain.

16. Can my broker increase my margin requirement?

Yes. Brokerage firms can impose higher house requirements, including for particular securities or during periods of elevated risk.

17. Can margin be used for long-term investing?

It can be used to finance positions held over longer periods, but the investor continues to face interest costs, maintenance requirements and the possibility of forced liquidation.

18. Does margin guarantee higher returns?

No. Margin amplifies exposure to the underlying investment. It can increase gains, but it can also amplify losses.

19. What happens if my stock falls sharply?

Your account equity can decline rapidly. If it falls below the required maintenance level, the broker may require additional collateral or liquidate securities.

20. What should I check before opening a margin account?

Review the margin interest rate, initial and maintenance requirements, house rules, eligible securities, margin-call procedures, liquidation rights, collateral rules and all associated fees.

Final Thoughts: Margin Is a Financing Tool, Not a Shortcut

Buying stocks on margin can significantly increase an investor’s purchasing power.

But the same mechanism that can magnify gains can also magnify losses.

The most important concept to remember is simple:

When you invest with borrowed money, you are managing both an investment and a loan.

The investment can decline. Interest continues to accrue. Maintenance requirements must be satisfied. The brokerage firm can increase its requirements in certain circumstances, and a margin deficiency can lead to forced liquidation.

For that reason, investors should evaluate margin not only by asking how much additional stock they can buy, but also by asking:

• How much debt am I taking on?
• How much interest will I pay?
• How much can the portfolio decline before I face a margin problem?
• Can I provide additional cash if needed?
• Could I survive a severe market decline without being forced to sell?

The goal of investing is not simply to maximize exposure to financial markets. It is to build wealth in a way that is consistent with your financial resources, time horizon and ability to withstand uncertainty.

Margin can be one tool within that broader framework. But understanding the downside is at least as important as understanding the additional purchasing power.