What Is Margin Trading? Borrowing to Trade Explained
Margin trading means borrowing money from your broker to buy more of an investment than your own cash would allow. That borrowing is called leverage, and it's a double-edged sword: it magnifies your gains, but it magnifies your losses just as much — and it can force you to sell at the worst possible moment.
How margin works
A regular (cash) account lets you buy only what your money covers. A margin account lets you borrow against the investments you already hold, using them as collateral. So with $5,000 of your own money you might control, say, $10,000 of stock — your cash plus a $5,000 loan from the broker. You pay interest on that loan for as long as you hold the position.
Why leverage cuts both ways
Leverage doesn't change whether an investment goes up or down — it changes the size of the outcome relative to your own money. Consider $5,000 of your cash used to control $10,000 of stock (a 2x leverage):
| Stock moves | Without margin ($5,000) | With 2x margin ($10,000) |
|---|---|---|
| +20% | +$1,000 (+20%) | +$2,000 (+40% on your cash) |
| -20% | -$1,000 (-20%) | -$2,000 (-40% on your cash) |
| -50% | -$2,500 (-50%) | -$5,000 (wiped out, still owe interest) |
The upside looks tempting in isolation, but the downside is brutal: the same swing that doubles your gain also doubles your loss, and a large enough drop can erase your entire stake while you still owe the borrowed money.
The margin call: the part that hurts
Brokers require your account to stay above a minimum equity level (the maintenance margin). If losses push you below it, you get a margin call — a demand to add cash or sell holdings immediately. If you can't or don't act in time, the broker can sell your investments for you, often at the bottom, locking in the loss. This is why leverage is so dangerous during sharp volatility: the very moment prices are crashing is when you're forced to sell.
How it relates to short selling
Margin is also the machinery behind short selling — borrowing shares to bet on a price falling. Both share the same core danger: you're operating with borrowed value, so losses aren't capped at what you put in. A related idea is a short squeeze, where forced buying by trapped short sellers sends a price rocketing.
Why beginners are so often warned off it
Margin turns ordinary market swings into outsized swings in your money, adds interest costs that grind away at returns, and introduces the risk of forced selling at the worst time. It demands constant attention and a strong stomach. Sound risk management — including tools like a stop-loss — becomes not optional but essential, and even then the risk is real.
The bottom line
Margin trading means borrowing from your broker to trade a bigger position than your cash allows. Leverage magnifies gains and losses equally, you pay interest on the loan, and a margin call can force you to sell at the worst possible time — with the real possibility of losing more than you put in. It's powerful, costly, and unforgiving, which is why it carries such heavy warnings.
When you're ready to actually place a trade, our honest comparison of Canada's best brokers breaks down fees and who each one suits — no hype.
Frequently asked
What is margin trading in simple terms?
Margin trading means borrowing money from your broker to buy more of an investment than your own cash alone would allow. Your existing investments act as collateral for the loan. This borrowing is called leverage, and it magnifies both the gains and the losses on the trade.
Why is margin trading so risky?
Because leverage amplifies losses just as much as gains. If a leveraged position moves against you, you can lose more than your original cash, and you still owe the borrowed money plus interest. A sharp drop can also trigger a margin call, forcing you to add funds or sell at the worst possible time.
What is a margin call?
A margin call happens when your losses push the value of your account below the minimum the broker requires for the loan. The broker demands you add more money or sell holdings to cover the shortfall. If you don't act fast enough, the broker can sell your investments automatically, often at a loss.
Can you lose more than you invest with margin?
Yes. Because you're trading with borrowed money, losses can exceed the cash you put in. You remain responsible for repaying the loan and its interest even if the position falls sharply, which is what makes margin fundamentally different from investing only your own money.
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