What Are Bonds? 5 Decisive Differences from Stocks
When you start investing, the first two words you encounter are usually “stocks” and “bonds.” But when someone asks, “What exactly is a bond?” it can be surprisingly hard to answer clearly. In one sentence, here is the idea. A stock means buying an ownership stake in a company, while a bond means buying an IOU that pays you interest for lending money to someone. That one-line difference separates everything from return structure to risk and repayment priority. Today, let’s unpack those differences step by step with numbers.
| Section | Key summary |
|---|---|
| Introduction | In one sentence, here is the idea |
| Bonds = interest-bearing “IOUs” | Short key point |
| Stocks = company ownership, with nothing fixed | By contrast, when you buy a stock, you own part of that company |
| If a company fails, who gets paid first? | The decisive difference between the two appears in the order of repayment |
| 5 differences at a glance | Volatility: bonds are relatively lower / stocks are higher |
| Why do bond prices fall when interest rates rise? | This is the part that most often confuses bond beginners |
| So how should you combine them? Asset allocation | A commonly used starting point is the formula: stock allocation = 100 - your age |
Bonds = interest-bearing “IOUs”
A bond is a debt certificate issued by a government, public institution, or company to borrow money. The issuer pays the promised interest, or coupon rate, over a set period, known as the maturity, and returns the borrowed principal, or face value, when the bond matures. For example, suppose you buy a bond with a face value of 1 million won, an annual coupon rate of 4%, and a 3-year maturity. You receive 40,000 won in interest each year, and after 3 years you get back the 1 million won principal. The total amount received is 120,000 won in interest plus 1 million won in principal, for a total of 1.12 million won. The key point is that, as long as the issuer does not default, the amount you will receive is determined from the start.
Stocks = company ownership, with nothing fixed
By contrast, when you buy a stock, you own part of that company. There is no fixed interest and no principal that must be paid back. If the company does well, the share price may rise and you may receive dividends, but if performance worsens, the share price could be cut in half or dividends could stop. A stock investment worth 1 million won could become 1.5 million won after a year, or it could fall to 600,000 won. There is no fixed ceiling, but the downside protection is also weak. In other words, bonds offer fixed but limited returns, while stocks offer potentially unlimited but uncertain returns.
If a company fails, who gets paid first?
The decisive difference between the two appears in the order of repayment. When a company goes bankrupt and liquidates its assets, debts, including bonds, are repaid first, and anything left over is distributed to shareholders. In other words, bondholders stand ahead of shareholders. That is why bonds of the same company are considered safer than its stocks. However, “safer” is only relative, and if the issuer defaults, bonds can also lose principal. The indicator that shows bond risk is the credit rating: AAA is the safest, while BB and below are speculative grade.
5 differences at a glance
- Nature: bonds are money lent, held by creditors / stocks are ownership stakes, held by shareholders
- Return source: bonds provide interest plus principal at maturity / stocks provide capital gains plus dividends
- Volatility: bonds are relatively lower / stocks are higher
- Priority in bankruptcy: bondholders come first, shareholders last
- Maturity: bonds have a fixed maturity / stocks have no maturity and can be held indefinitely
Why do bond prices fall when interest rates rise?
This is the part that most often confuses bond beginners. If you hold a bond to maturity, you receive the promised principal, but bonds can also be bought and sold before maturity. When market interest rates rise, newly issued bonds pay higher interest, so previously issued “low-interest” bonds become less attractive. For example, if you hold a 3% annual bond and market rates rise to 5%, you need to lower the price of your 3% bond in order to sell it. That is why an inverse relationship forms: rising interest rates lead to falling prices for existing bonds. If you hold the bond to maturity, this price fluctuation does not affect your profit or loss, but remember that selling before maturity can result in a loss.
So how should you combine them? Asset allocation
The answer is not “one or the other,” but “mix the two.” Stocks and bonds often tend to move in different directions, so holding them together can reduce overall volatility. A commonly used starting point is the formula: stock allocation = 100 - your age. For example, a 30-year-old might hold stocks 70 : bonds 30, while a 60-year-old might hold stocks 40 : bonds 60, increasing stable assets with age. It is not an absolute rule, but it helps you develop a basic sense of diversification, adjusting risk to your own investment horizon and temperament.
- First decide your investment horizon and risk tolerance: when will you need the money?
- Set the broad stock-to-bond ratio, such as 60:40
- Do not concentrate in one security; diversify across multiple securities and countries
- Once or twice a year, check whether the ratio has drifted and rebalance
In short, bonds are stability-oriented assets that provide fixed interest and principal, while stocks are uncertain assets with greater growth potential. Neither is absolutely right in every case; the key is to adjust the ratio according to your own goals, time horizon, and temperament. This article is reference material intended to help you understand the concept, not investment advice. Before making an actual investment, you should review the product prospectus and your own situation whenever possible.