Simple definition
A margin account is a brokerage account that lets you borrow money from your broker to invest, using your holdings as collateral. It can boost gains but magnifies losses, and you pay interest on the loan. Think of it like a mortgage on your investments: the leverage cuts both ways and the debt doesn't disappear.
Why it matters
A margin account adds borrowing power, but it also adds real danger that a plain cash account avoids. If your holdings fall below the broker's required minimum, you can face a margin call — and the broker can sell your investments without your permission to cover the loan. Most long-term investors are fine with a cash account.
Real-life example
Say you put in $5,000 and borrow another $5,000 on margin to buy $10,000 of stock. If it drops sharply, your losses come off your $5,000 first, and the broker may demand more cash or sell your shares. These are rounded, hypothetical figures to show the risk, not a suggestion to borrow.
Common mistakes
- Treating borrowed buying power as free money instead of a loan that charges interest.
- Not realizing the broker can sell your holdings without asking to cover a margin call.
- Using margin on volatile stocks, where a sharp drop can trigger forced selling fast.
- Assuming a margin account is standard, when a cash account carries far less risk.
Pro tips
- Understand that borrowing on margin magnifies losses and adds interest costs before opening one.
- Know the broker can force-sell your investments to cover a shortfall, on their timing.
- Recognize that a plain cash account meets the needs of most long-term investors.
- If you ever use margin, learn the maintenance rules and keep a wide safety cushion.
Related Money Dictionary terms
- Brokerage AccountAn account you open with an investment firm to buy and sell stocks, bonds, funds, and other investments.
- Cash AccountA brokerage account where you pay in full for investments and cannot borrow to trade.
- LeverageUsing borrowed money to increase the size of an investment, raising both potential returns and potential losses.
- Margin CallA demand from your broker to add money or sell holdings when borrowed-investment losses grow too large.
- Short SellingBetting an investment's price will fall by borrowing shares, selling them, and hoping to rebuy cheaper later.
- BrokerA firm or person that carries out your orders to buy and sell investments, often for a fee or commission.
Frequently asked questions
What's the difference between a margin account and a cash account?
In a cash account you can only invest money you actually have. A margin account lets you borrow from the broker to invest more, using your holdings as collateral. That borrowing can amplify both gains and losses, adds interest, and exposes you to margin calls. A cash account carries none of those extra risks.
Can my broker sell my investments without asking?
Yes. In a margin account, if your account value falls below the broker's required minimum, they can issue a margin call and are allowed to sell your holdings to cover the loan — often without contacting you first and without letting you choose which positions go. It's one of the biggest risks of investing on margin.
How much can I borrow in a margin account?
Regulators set floors on how much you must put in, and brokers can require more than the legal minimum, so the exact amount varies by firm and by security. The key point isn't the maximum — it's that borrowing more raises both your interest costs and your risk of a forced sale in a downturn.
Knowing what Margin Account means is knowledge — the first half. A brick gets placed when you act on it: Before opening or using margin, read FINRA's investor guidance on margin accounts and confirm whether a cash account already meets your needs..
Sources & references
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Plain-English education — not personalized legal, tax, or investment advice.