A margin account lets you borrow money from your brokerage to buy stocks or other investments

A margin account is a type of investment account where your brokerage firm lends you money to purchase securities — stocks, bonds, exchange-traded funds, and similar investments. You put in some of your own money, and the brokerage covers the rest. The amount you can borrow depends on the value of what you already own in the account; the brokerage uses your existing investments as collateral.

This is different from a regular cash account, where you can only buy investments with money you deposit yourself. With a margin account, you can buy more than your cash alone would allow. That sounds like an advantage, but it comes with real costs and real risks — which is why margin accounts are not the default option at most brokerages.

The basic mechanics are straightforward: you deposit $5,000, your brokerage lends you another $5,000 (or some other amount, depending on the rules), and you use the full $10,000 to buy investments. If those investments go up in value, you keep the gains on the full $10,000 — but you still owe back only the $5,000 you borrowed. If they go down, you lose money on the full $10,000, and you still owe back the $5,000.

Key Takeaways

  • A margin account is a loan from your brokerage: you deposit your own money and borrow the rest to buy investments, using what you own as collateral.
  • You pay interest on the borrowed money, and the interest rate varies by brokerage and by how much you borrow.
  • If your investments fall in value, your brokerage can force you to sell holdings or deposit more cash to cover the loan — a process called a margin call.
  • Margin accounts are riskier than cash accounts because losses are magnified: you can lose more than the money you put in.
  • Opening a margin account requires approval from your brokerage and usually a minimum deposit, often $2,000 or more.

How the borrowing works and what it costs

When you borrow through a margin account, you are borrowing from your brokerage, not from a bank. The brokerage charges you interest on the borrowed amount — this is called the margin interest rate or debit interest rate. The rate varies by brokerage and usually depends on how much you have borrowed. Borrow a small amount and the rate might be higher; borrow a larger amount and it may be lower. Rates also change over time as the brokerage's own borrowing costs change.

You pay this interest whether your investments make money or lose money. If you borrow $5,000 at 8% annual interest and hold the loan for a year, you owe $400 in interest regardless of what happened to your stocks. That cost comes out of any gains you make, or it adds to your losses.

The amount you can borrow is limited by Regulation T, a federal rule that says you can borrow up to 50% of the value of marginable securities you own. That means if you have $10,000 in stocks, you can borrow up to $5,000 more. But your brokerage can set stricter limits, and different types of investments have different borrowing limits — some stocks allow 50% borrowing, others allow less, and some cannot be used as collateral at all.

What a margin call is and when it happens

A margin call is a demand from your brokerage that you deposit more money or sell investments to bring your account back into compliance with borrowing rules. It happens when the value of your investments falls enough that the collateral no longer covers the loan.

Here is a concrete example: you deposit $10,000 and borrow $10,000, buying $20,000 worth of stock. Your brokerage requires that the value of your investments stay at least 130% of what you owe — this is called the maintenance requirement. That means your $20,000 in stock must stay worth at least $13,000 (because $13,000 ÷ $10,000 = 1.30). If your stock falls to $12,500, you have fallen below the maintenance requirement. Your brokerage will call and ask you to deposit $500 in cash or sell $500 worth of stock. If you do not act quickly — usually within a few days — your brokerage can sell your holdings without asking you, using the proceeds to pay down the loan.

Margin calls can happen fast. A stock market drop of 10% or 15% can trigger them in accounts with large borrowed amounts. You have no choice in whether to comply; if you do not deposit cash or sell, your brokerage will do it for you.

The real risks of borrowing to invest

Margin amplifies both gains and losses. If you invest $10,000 of your own money and it goes up 20%, you make $2,000. If you invest $10,000 of your own money plus $10,000 borrowed and the same investment goes up 20%, you make $4,000 on the $20,000 total — but you still owe back the $10,000 you borrowed, so your net gain is $4,000 minus the interest you paid. That sounds good until the market moves the other way.

If that same $20,000 investment falls 20%, it is now worth $16,000. You still owe $10,000 to your brokerage. Your $10,000 in cash has become $6,000 — a 40% loss on your own money. If it falls 50%, your $20,000 is now $10,000, and you owe $10,000, leaving you with nothing. In theory, if the investment falls more than 50%, you could owe more than you have — though most brokerages have safeguards to prevent this.

Margin calls can force you to sell at the worst time. If the market drops sharply and your brokerage issues a margin call, you may have to sell holdings while prices are down, locking in losses. You do not get to wait for a recovery.

Who can open a margin account and what you need

Not everyone can open a margin account. Your brokerage must approve you, and approval usually requires:

  • A minimum deposit, often $2,000 or more (this varies by brokerage).
  • A completed process acknowledging the risks.
  • Enough investment experience or income that the brokerage believes you understand what you are doing.
  • A valid Social Security number and other identity verification.

Some brokerages are more willing to approve margin accounts than others. Some require you to have held an account for a certain period before you can open a margin account. A few brokerages do not offer margin accounts at all.

Once approved, you can choose whether to use margin on any given trade. Opening a margin account does not mean you have to borrow; you can deposit cash and buy investments the same way you would in a regular account. The difference is that you have the option to borrow if you want to.

Margin accounts versus cash accounts

In a cash account, you can only buy investments with money you have deposited. If you have $5,000 in cash, you can buy up to $5,000 worth of investments. There is no borrowing, no interest, and no margin calls. Your losses are limited to the money you put in.

In a margin account, you can buy more than your cash balance allows. You pay interest on the borrowed amount, and you face the risk of margin calls. You also face the risk of losing more than you invested if the market moves sharply against you.

For most people new to investing, a cash account is simpler and safer. Margin accounts are tools for experienced investors who understand the risks and have a specific reason to borrow — usually to take advantage of short-term price movements or to hold a larger position than their cash alone would allow. If you are still learning how investing works, a cash account is the better starting point.

How margin accounts fit into a line of credit

A margin account is one form of borrowing, but it is different from a traditional line of credit. With a line of credit, you borrow money and use it for whatever you want — paying bills, making a large purchase, covering an emergency. With a margin account, you borrow money specifically to buy investments, and the investments themselves serve as collateral.

The advantage of margin is that the interest rate is often lower than a personal line of credit or credit card, because the brokerage has collateral — your investments — that it can sell if you do not pay back the loan. The disadvantage is that you cannot use the borrowed money for anything except buying investments, and you face the risk of forced sales if the value of those investments falls.

Frequently Asked Questions

Can I lose more money than I put into a margin account?

In theory, yes, though most brokerages have safeguards to prevent it. If your investments fall more than 50% and you have borrowed 50%, you could owe more than your account is worth. In practice, your brokerage will issue a margin call and force you to sell before that happens, but the forced sale locks in your losses at the worst time.

What happens if I cannot meet a margin call?

Your brokerage will sell your holdings without asking you, using the proceeds to pay down the loan. You have no control over which investments are sold or when. This can trigger tax consequences if you have gains in some positions.

Is the interest on a margin account tax deductible?

Margin interest is only deductible if you use the borrowed money to buy investments that produce taxable income, such as dividend-paying stocks or bonds. The rules are complex, and you should consult a tax professional about your specific situation.

Can I use a margin account for day trading?

Yes, but there are additional rules. The SEC requires that accounts used for day trading (buying and selling the same security within a single trading day) maintain a minimum balance of $25,000. If your account falls below that, you cannot day trade until you deposit more money.

What is the difference between initial margin and maintenance margin?

Initial margin is the amount you must deposit when you first open a margin account or make a new purchase — usually 50% of the purchase price. Maintenance margin is the minimum percentage of collateral you must keep in the account at all times — usually around 25% to 30%. A margin call happens when your account falls below the maintenance requirement.