What Is 'Debt Investing'? Why Buying Stocks With Borrowed Money Is So Risky

If you spend any time in stock investing communities, you'll come across the term 'debt investing.' It means investing with borrowed money—basically, buying stocks with cash you've borrowed from a brokerage instead of using your own. You might think, 'If the stock price goes up, I'll just pay it back, right?' But in reality, it's a very risky structure. Let me walk you through why.

Two types of debt investing: margin trading vs. cash advance

There are mainly two ways to do debt investing: margin trading and cash advance trading. Even if these terms sound unfamiliar, don't worry. I'll explain both.

Margin trading is when you borrow money from a brokerage to buy stocks. Usually, you can borrow up to 2 to 2.5 times your own assets. So if you have 1 million won, you can buy up to 2 to 2.5 million won worth of stocks. In return, the borrowed money comes with interest of around 7 to 10% per year, and you have to pay it back within a set timeframe.

Cash advance trading works a bit differently. It's a method where you buy stocks but pay for them later. When you place an order, settlement happens 2 trading days later—and during that window, you can buy stocks even if you don't have the cash in your account yet. The timeframe is much shorter than margin trading, and you must deposit the money within those 2 trading days.

Why does the profit look bigger?

The biggest temptation with debt investing comes from the leverage effect. Leverage, like a lever or crowbar, means using your own small amount of money to control a much larger position in stocks.

Here's an example. Say you buy stocks with just 1 million won of your own money and the price goes up 10%. Your profit is 100,000 won. But if you borrowed another 1 million won and bought 2 million won worth of stocks, that same 10% gain gives you a profit of 200,000 won. Your profit margin compared to your original capital looks doubled.

The scariest part: forced liquidation

The real danger of debt investing isn't just the bigger losses. It's forced liquidation. Forced liquidation means the brokerage forcefully sells your stocks without your permission.

Here's how it works. You bought stocks through margin or cash advance trading, but the price drops. From the brokerage's perspective, there's now a risk they won't get their money back. So when the value of your account falls below a certain threshold, the brokerage sells your stocks to the market at the worst possible price, without warning. That's forced liquidation.

What's especially terrifying is that forced liquidation happens at the market's worst price. Your stocks get sold not at the price you want, but at the most unfavorable price possible. Since the stock has already dropped significantly, you're taking a double hit—forced to sell at an even worse price.

What could actually happen to you?

Let me walk through the numbers. You have 1 million won of your own money and borrow 1 million won from the brokerage, buying 2 million won worth of stocks. Then the price drops 40%.

Your stocks are now worth 1.2 million won. After repaying the 1 million won you borrowed plus interest, you're left with less than 200,000 won. You've lost over 800,000 won of your original 1 million won. If the price drops more than 50%, you can't even repay the borrowed amount, and the brokerage could seize your other assets to cover the shortfall.

Why is it even riskier for individual investors?

Professional investors use leverage too, but their situation is different from individual investors. There are three main reasons.

First, emotional control becomes nearly impossible. When you have borrowed money on the line, even a small price swing triggers panic. It's hard to make rational decisions.

Second, time isn't on your side. Over the long term, stock prices often recover. But with cash advance, you have 2 trading days; with margin, just weeks. You don't have the time to wait for recovery.

Third, you can't stop forced liquidation. It's the brokerage's right, not yours. No matter how much you beg for more time, if you hit the threshold, it triggers automatically.

Let me wrap this up

Debt investing looks like it can magnify your profits, but it magnifies your losses just the same. Forced liquidation is especially dangerous because it's a forced loss confirmation you have no control over. To survive long-term in the stock market, protecting your principal is the number one priority. As a beginner, build a habit of prioritizing safety over greed.