What Are the Risks of Buying on Margin?
Buying on margin can sound like a clever shortcut to bigger returns. The part that gets less attention is what happens when the trade doesn’t go your way, and how quickly that can become a forced decision rather than a chosen one.
The short answer
Buying on margin means investing with money borrowed against a margin account, and the core risk is that losses can exceed the amount you originally put in, because you still owe the borrowed portion no matter how the investment performs. On top of that, margin loans accrue interest, and a falling account value can trigger a margin call that forces you to add cash or sell holdings at a bad time. These risks compound each other rather than acting independently.
Losses can be larger than your investment
In a standard cash account, the most you can lose is what you put in. On margin, that ceiling disappears. If you borrow to double the size of a position and that position drops sharply, you can end up owing more than your original stake, since the loan itself doesn’t shrink just because the collateral did. This is the single biggest difference between investing with your own money and investing with borrowed money, and it’s easy to underestimate until it’s actually happening.
Margin calls can force bad timing
When the value of your holdings falls enough that your equity cushion drops below the required minimum, the brokerage can issue a margin call. You then have to deposit more cash or sell securities, often on a short deadline and sometimes without much say in which holdings get sold. That means a downturn can force you to sell near a low point — the opposite of the patient, dollar-cost averaging approach many long-term investors try to follow. The forced nature of the sale is what makes margin calls particularly unpleasant; they take a decision that would normally be yours and hand it to circumstances.
Interest cost works against you either way
Margin loans charge interest continuously, regardless of whether your investments are gaining or losing value. That interest is a drag on returns even in a good year, and it becomes a second source of loss layered on top of a bad one. Unlike a fixed-rate loan for something like a home, margin rates are generally set by the brokerage and can change, adding an element of uncertainty to the cost side of the equation.
Volatility hits harder on margin
Ordinary market ups and downs feel different when leverage is involved. A price swing that would be a minor paper loss in a cash account can threaten your equity cushion in a margin account, since the borrowed amount stays constant while the collateral value moves. This is closely related to diversification — a concentrated, leveraged position magnifies the impact of volatility in a single holding far more than a diversified one would.
What to weigh
Margin isn’t automatically a bad tool, but it changes what kind of investor you need to be: someone who can tolerate forced sales, ongoing interest costs, and losses that go beyond their original contribution. Before using margin, it helps to think through the worst reasonable scenario, not just the best one, and to be clear-eyed about whether the added risk fits your own tolerance and time horizon. For many long-term investors, the simpler path of investing only what they actually have covers their goals without introducing borrowed money at all.