Margin trading lets you borrow money from your broker to buy more stock than you could with cash alone

When you trade on margin, your broker lends you money so you can purchase securities. You put down a portion of the purchase price yourself — called the margin — and the broker covers the rest. For example, if you have $5,000 and want to buy $10,000 worth of stock, you might use margin to borrow the other $5,000. You pay interest on the borrowed amount, just like a loan.

The appeal is leverage: your money controls a larger position, so gains are bigger. The danger is the same: losses are also bigger, and you still owe the full loan even if the stock price drops. Your broker can force you to sell positions to cover the debt if your account value falls below a certain threshold, a situation called a margin call.

Key Takeaways

  • Margin is a loan from your broker that lets you buy more securities than your cash balance allows, and you pay interest on the borrowed amount.
  • Leverage amplifies both gains and losses — a 10% stock price drop wipes out 20% of your margin account if you borrowed half the purchase price.
  • Your broker sets a minimum account value (often 25% to 30% of the total position value) and can force you to sell holdings if you fall below it, called a margin call.
  • Margin accounts require a signed agreement with your broker and are not available on all account types, such as IRAs or some retirement plans.

How the math works: gains and losses on margin

Suppose you have $10,000 in cash and buy $10,000 of stock without margin. The stock rises 20% to $12,000. You made $2,000, a 20% return on your money.

Now suppose you use $10,000 as margin to buy $20,000 of stock (borrowing $10,000 at 5% annual interest). The same 20% rise makes the position worth $24,000. After paying interest on the borrowed $10,000 for one year ($500), your profit is $3,500 on your $10,000 investment — a 35% return. Leverage worked in your favor.

But reverse the scenario: the stock falls 20% to $16,000. Your $10,000 position without margin loses $2,000. Your $20,000 margin position loses $4,000. After paying $500 in interest, you are down $4,500 on your $10,000 — a 45% loss. The same leverage that magnified gains now magnifies losses, and you still owe the broker the $10,000 you borrowed.

Margin calls and forced selling

Your broker does not let your account go deeply negative. Instead, they set a maintenance requirement — a minimum percentage of your position value that must stay in your account as equity. This is often 25% to 30%, though it varies by broker and by the specific security.

If your account equity falls below this threshold, your broker issues a margin call. You then have a set number of days (often two to five business days) to deposit cash or sell securities to bring your account back into compliance. If you do not act, your broker will sell your positions without asking you, usually starting with the ones that are easiest to sell quickly.

Forced selling can lock in losses at the worst time. If you bought stock at $50 and it drops to $30, a margin call forces you to sell at $30 to raise cash, even if you believed the price would recover. You cannot wait out the downturn.

Interest costs and fees

Borrowing money from your broker is not free. You pay margin interest, which is an annual rate applied daily to the amount you have borrowed. Rates vary by broker and by how much you borrow — borrowing $5,000 might cost 6% annually, while borrowing $100,000 might cost 4%. The interest accrues daily and is usually deducted from your account monthly or quarterly.

Some brokers also charge a margin fee separate from interest, or charge higher rates if your account balance is small. Read your broker's margin agreement to see the exact rates and how often they are charged. Over time, margin interest can eat significantly into your returns, especially if the stock does not move much.

Who can trade on margin and what accounts may have access to

To open a margin account, you must be at least 18 years old and meet your broker's account minimums, which are often $2,000 to $5,000. You will sign a margin agreement that explains the terms, including interest rates, maintenance requirements, and your broker's right to force a sale.

Not all account types allow margin. Retirement accounts like IRAs and 401(k)s cannot use margin, because the tax rules prohibit borrowing inside those accounts. Some brokers do not offer margin on certain securities, such as penny stocks or newly issued shares. Check with your specific broker about which accounts and securities are may be able to access.

Margin vs. other ways to increase buying power

Margin is one way to control a larger position with less cash, but it is not the only way. Options let you control a large stock position with a smaller upfront cost, though the mechanics and risks are different. Futures also use leverage and require only a small deposit (called margin in futures, but it works differently). Mutual funds and ETFs let you own a diversified basket of stocks without picking individual names.

Each tool has different costs, risks, and tax consequences. Margin is straightforward — you borrow cash and pay interest — but it is also the most direct way to amplify both gains and losses on individual stock picks. If you are new to investing, building a portfolio without margin first helps you understand how individual stocks move before you add leverage.

Common mistakes and risks to avoid

The biggest mistake is treating margin as information programs. You are borrowing at a real interest rate, and you must repay it regardless of whether your trades win or lose. Some traders use margin to chase quick gains, then panic when a position moves against them and are forced to sell at a loss.

Another common error is not understanding your broker's maintenance requirement. A 25% requirement sounds safe until a stock drops 30% in a day — suddenly you are in a margin call with no time to think. Volatile stocks, small-cap stocks, and stocks in falling markets trigger margin calls faster than stable, large-cap names.

Finally, some traders borrow more than they can afford to repay. If you borrow $50,000 and the position drops 50%, you owe $50,000 to your broker even though your position is now worth $25,000. You must cover the debt from other assets or cash. Margin is a loan, not a gift, and the debt is real.

Frequently Asked Questions

Can I lose more money than I put in with margin?

Yes. If you borrow $10,000 and the stock drops to zero, you still owe the $10,000 plus interest to your broker. Your loss is the $10,000 you invested plus the interest, which is more than 100% of your initial cash. Your broker will force a sale before the stock reaches zero, but the principle holds: margin can create losses larger than your starting balance.

What happens if I cannot pay a margin call?

Your broker will sell your positions without your permission to raise the cash needed to bring your account into compliance. They usually sell the most liquid (easiest to sell) holdings first, which may not be the ones you wanted to sell. If the forced sale still does not raise enough, you owe your broker the remaining balance as a debt.

Is margin trading the same as day trading?

No. Margin is a tool that lets you borrow money to buy securities. Day trading is a strategy of buying and selling the same security within one trading day. You can day trade without margin (using only your cash), or you can use margin to day trade with more buying power. They are separate concepts.

Do I pay taxes on margin interest?

Margin interest is a deductible expense if you use the borrowed money to buy investments held for income or growth. You report it as an investment expense on your tax return. The rules are complex and depend on your situation, so consult a tax professional about how margin interest affects your specific return.

Can I use margin in a retirement account?

No. IRAs, 401(k)s, and other tax-deferred retirement accounts do not allow margin borrowing. The tax rules prohibit debt inside these accounts. You can only trade with the cash you have deposited into the account.