What Is Margin Trading? (Day Trading Glossary)

Margin trading means borrowing money from your broker to buy more stock than your own cash could cover, using the cash and stocks in your account as collateral. It magnifies your gains when a trade works, and it magnifies your losses just as fast when it doesn't.

Because you're trading with borrowed money, margin is one of the highest-risk things a trader can do, and it deserves a lot of respect.

How margin trading works

To trade on margin, you open a margin account instead of a plain cash account. That's what lets you borrow against what you hold.

Under US rules set by the Federal Reserve, you can generally borrow up to half of a stock's purchase price. If you put in $5,000 of your own money, you can borrow another $5,000 and buy $10,000 of stock. The broker charges interest on that borrowed amount for as long as you hold the position, which is an ongoing cost that eats into any profit.

Maintenance margin and margin calls

After you buy, your broker requires you to keep a minimum amount of your own equity in the account, called the maintenance margin. It's often around 25% or more, depending on the broker and the stock.

If your stock falls and your equity drops below that minimum, you get a margin call. The broker demands that you add cash or sell holdings to cover the shortfall, and if you don't act, the broker can sell your stock for you without asking. A margin call tends to come at the worst possible time, when your positions are already down.

Why margin is so risky

Margin amplifies your results in both directions. On the way up, you control a larger position with less of your own money, so your percentage return is bigger. On the way down, that same leverage multiplies your loss at the same rate, and you can end up losing more than the cash you started with. Add the interest cost on top, and a losing margin trade can hurt far more than a normal one.

Margin and day trading

For the fast trading I do, margin comes up in two ways. It gives me extra buying power, and it's also what I need to short a stock, since shorting means borrowing shares.

Leverage doesn't change my approach, it raises the stakes on it. Tiny, pre-planned stops matter even more when I'm using borrowed money, because a margin call can force me out before I'm ready. Day trading with a margin account also comes with its own rulebook, which I cover in the pattern day trader guide. None of this is a reason to reach for leverage early. It's a reason to master risk on my own money first, the way my method is built.

Frequently asked questions

Is it a good idea to trade on margin?

For most people, especially beginners, it's a risk that outweighs the reward. Margin can boost returns, but it magnifies losses just as much, and a margin call can force you to sell at the worst moment. It's generally suited to experienced traders who fully understand the costs and can manage the added risk, not a shortcut to bigger gains.

Is margin trading illegal?

No. Margin trading is legal and regulated in the US, with rules from the Federal Reserve and FINRA covering how much you can borrow and how much equity you must maintain. Being legal doesn't make it safe, though. The rules exist precisely because the risk is high.

How long can you hold a stock on margin?

There's no fixed time limit. You can hold a margin position as long as you keep enough equity to meet the maintenance requirement and you keep paying the interest on the loan. If your equity slips too low, a margin call can end the position for you.

This content is for educational purposes only and is not financial advice. Trading involves significant risk and may not be suitable for all traders.