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

A margin account is a brokerage account that allows you to borrow cash from your broker to purchase investments. Unlike a regular cash account where you can only spend money you already have, a margin account extends credit to you based on the securities you hold. The broker holds your investments as collateral for the loan.

The amount you can borrow depends on the value of your holdings and federal rules. The Federal Reserve's Regulation T currently requires that you put up at least 50 percent of the purchase price yourself — meaning you can borrow up to 50 percent. Your broker may require a higher percentage, often 60 to 70 percent of your own money. This borrowed money is not free; you pay interest on it, and that interest rate varies by broker and market conditions.

Margin accounts are common among active traders and investors who want to amplify their buying power. They are also riskier than cash accounts because losses are magnified along with gains, and you can end up owing money even after selling your positions.

Key Takeaways

  • A margin account allows you to borrow up to 50 percent of a purchase price from your broker, with the rest coming from your own money.
  • Your broker charges interest on borrowed funds, and that rate depends on the broker and current market conditions.
  • If your account value drops below the broker's maintenance requirement, you will receive a margin call and must deposit cash or sell securities immediately.
  • Margin amplifies both gains and losses — you can lose more than your initial investment if prices move against you.
  • Opening a margin account requires approval from your broker and typically involves signing a margin agreement that outlines the terms and risks.

How the borrowing limit works

When you open a margin account, your broker sets a buying power based on your cash and the value of securities you already own. If you have $10,000 in cash and $10,000 in stocks, your buying power is roughly $40,000 — you can borrow an additional $20,000 because your total collateral is $20,000 and you can borrow 50 percent of that under Regulation T.

The exact calculation depends on which securities you hold. Stocks typically allow 50 percent margin, but bonds, mutual funds, and other investments may have different limits. Your broker's website or account dashboard will show your current buying power and how much margin you have available.

As the value of your holdings changes, your buying power changes too. If your stocks rise in value, you have more collateral and can borrow more. If they fall, your buying power shrinks and you may trigger a margin call.

Margin calls and what happens when prices drop

A margin call occurs when the value of your account falls below your broker's maintenance requirement — typically 25 to 30 percent of the total value of your securities, though some brokers require higher percentages. When this happens, your broker demands that you deposit cash or sell securities to bring your account back into compliance, usually within one to five business days.

If you do not meet the margin call, your broker has the right to sell your securities without your permission to raise the cash. This forced liquidation happens at whatever price the market offers at that moment, which may be a loss. You remain responsible for any shortfall — if the sale does not raise enough to cover what you owe, you still owe the difference to the broker.

Margin calls can happen quickly during market downturns. A 20 percent drop in your stock holdings can easily trigger a call if you are borrowing near the maximum. This is why margin accounts carry significant risk for investors who cannot respond quickly or do not have cash reserves available.

Interest rates and the cost of borrowing

Brokers charge interest on the cash you borrow, and the rate varies. Most brokers use a tiered structure where the rate depends on how much you are borrowing — borrowing $5,000 might cost 8 percent annually, while borrowing $50,000 might cost 6 percent. Rates also move with the market; when the Federal Reserve raises rates, broker margin rates typically rise too.

Interest accrues daily and is usually deducted from your account monthly or quarterly. If you borrow $20,000 at 7 percent annual interest, you pay roughly $1,400 per year, or about $117 per month. That cost eats into your returns, so margin makes sense only if you believe your investments will earn more than the interest you are paying.

You can check your broker's current margin rates on their website. Rates vary significantly between brokers, so comparing them matters if you plan to borrow regularly. Some brokers offer lower rates for larger balances or loyalty discounts.

Opening a margin account and the approval process

To open a margin account, you must request one from your broker. Most brokers allow you to convert an existing cash account or open a new margin account directly through their website or by phone. Your broker will ask you to sign a margin agreement that explains the terms, risks, and your obligations.

Brokers typically require a minimum account balance to open margin — often $2,000 to $5,000, though some require more. They may also review your investment experience and financial situation to determine whether margin is appropriate for you. This is not a formal credit check in the traditional sense, but brokers do assess whether you understand the risks.

Approval is usually quick, sometimes same-day. Once approved, you can begin borrowing immediately up to your buying power limit. Your broker will send you a copy of the margin agreement and documentation of your initial buying power.

Margin versus cash accounts: when to use each

A cash account requires you to pay for securities in full before you own them, and you cannot borrow against your holdings. Settlement takes two business days after you buy, and you cannot use the proceeds from a sale to buy something else until the sale settles. Cash accounts are simpler and carry no risk of a margin call, but they limit how much you can trade with a given amount of money.

Margin accounts offer flexibility and higher buying power, but they require active monitoring and understanding of margin calls. They make sense for experienced traders who have cash reserves, understand leverage, and can respond quickly to market moves. They are generally not recommended for buy-and-hold investors or people who cannot afford to lose more than their initial investment.

Some investors use margin for specific strategies — borrowing to buy dividend-paying stocks, for example — while keeping most of their portfolio in a cash account. This hybrid approach lets them use leverage selectively without exposing their entire portfolio to margin call risk.

Common mistakes and how to avoid them

The biggest mistake is borrowing too much relative to your cash reserves. If you borrow the maximum 50 percent and the market drops 30 percent, you will receive a margin call. Many new margin users underestimate how quickly this can happen or assume they will have time to deposit cash. In reality, brokers can force liquidation within days.

Another mistake is ignoring interest costs. Borrowing $50,000 at 6 percent costs $3,000 per year. If your investments return 5 percent, you are losing money before taxes. Margin only makes financial sense if you expect returns well above the interest rate you are paying.

A third mistake is using margin for speculative trades or volatile stocks. Margin amplifies losses just as it amplifies gains. A stock that drops 50 percent will wipe out your entire investment and leave you owing the broker money. Experienced traders limit margin to positions they are confident about and diversify across multiple holdings.

Frequently Asked Questions

Can I lose more money than I invested in a margin account?

Yes. If you borrow $20,000 and invest $40,000 total in a stock that drops to $5,000, you still owe the broker $20,000 plus interest. You have lost $35,000 — more than your initial $20,000 investment. Your broker can pursue collection for the shortfall.

What happens if I cannot meet a margin call?

Your broker will sell your securities without your permission to raise the cash needed to meet the call. If the sale does not cover what you owe, you remain liable for the difference. The forced sale may occur at unfavorable prices during market stress.

Do I have to use all my available margin?

No. Your available margin is a limit, not a requirement. You can borrow $5,000 of a $50,000 available margin if that matches your strategy. Borrowing less reduces your risk of a margin call and lowers your interest costs.

Can my broker change the margin requirement or interest rate?

Yes. Brokers can raise maintenance requirements or interest rates, though they typically give notice. During market volatility, some brokers raise requirements on specific stocks. Interest rates change regularly based on market conditions and the broker's policies.

Is margin the same as a line of credit?

Margin is a type of line of credit specific to brokerage accounts. It is secured by your investments and used to buy securities. Other lines of credit, like home equity lines, are separate products with different terms and uses.