Definition
The debt-to-equity ratio is a key financial metric that shows how much money a company has borrowed (debt) compared with its own pure funds (equity). It works like a health-checkup number that tells you at a glance whether a company can carry its debt and whether its finances are solid.
Your 100 million won, their 100 million won: what percent is that?
Imagine you open a restaurant with 100 million won of your own money and borrow another 100 million won from a bank. Your real capital and your debt are the same size, so the debt-to-equity ratio is exactly 100%.
What if business looks promising and you borrow 200 million won instead? The borrowed money is now double your capital of 100 million won, so the ratio jumps to 200%.
Here's where many people get confused. The ratio is not the share of debt in total assets. It's debt compared with your own pure money. Even if debt is 200 million won out of 300 million won in total, you compare it with your own 100 million won, so the ratio is 200%.
If your own money is a sturdy shield, debt is a heavy load on your back. When the load gets too heavy for the shield, even a small economic shock can make a company stagger.
Is 100% safe and anything over 200% dangerous?
In economic news and investment circles, a company with a ratio of 100% or less is generally seen as financially healthy, because it means borrowed money is smaller than its own capital.
For manufacturers, 200% or less is often treated as a reasonable safety line. But a high number doesn't automatically mean a bad company or one that is about to fail.
When the economy is good, debt can work like a lever, helping a company build factories and expand. That's the leverage effect. It can produce big profits much faster than investing slowly with only your own money.
But when a downturn hits and sales drop, things change fast. The debt doesn't go away, and expensive interest must be paid every month. A company with a very high ratio can fall into a cash crunch in no time.
To be more precise: it depends on the industry and the kind of debt
To be more precise, a reasonable ratio varies a lot with the industry. Airlines and shipping companies, which must buy and run lots of expensive planes and huge ships, often go far above the usual manufacturing benchmark.
On the other hand, IT software companies, which don't need big factories or costly machinery, often keep their ratios low. So simply comparing the numbers of companies in different industries is not good analysis.
Also, some of the debt on the books carries no interest at all, like customer deposits, a kind of ‘friendly debt.’ If a company takes an order in advance and receives a down payment, the books record it as a liability. But that can actually be a positive sign that there is plenty of work.
In the end, to read the ratio properly, don't just look at how big the number is. Also look at what the debt is being used for and whether the company can comfortably pay the interest.
Common misconceptions
A debt-to-equity ratio of 100% means 100% of the company's assets are debt.
It's not the share of debt in total assets. It's debt compared with your own money. A ratio of 100% means 100 million won of your own money and 100 million won of debt, so in a 200 million won company, your money and the debt are half and half.
Where you meet it
If you combine 100 million won of your own money with a 100 million won loan to buy a 200 million won house, the debt-to-equity ratio is 100%.
When a shipbuilder wins an order for large ships and receives a down payment in advance, liabilities on its books rise, so its debt-to-equity ratio temporarily goes up.
In one sentence
The debt-to-equity ratio compares borrowed money with your own capital, showing a company's ability to carry debt and its financial soundness.