Whenever the U.S. economy shakes, what do investors turn to? It's U.S. Treasury bonds. Although the interest rates are relatively low, they are easy to cash out, and above all, there's trust that the U.S. will never fail. In uncertain markets like these, interest in U.S. Treasury yields is steadily increasing among Korean investors seeking stable income.

First, you need to understand what Treasury bonds are. Simply put, they're like IOUs issued when the government borrows money. The government raises funds this way when tax revenue falls short, and investors receive interest semiannually or annually. There are three main types of Treasury bonds issued by the U.S. Department of the Treasury: short-term bills (T-bills) under one year, medium-term notes (T-notes) from 1 to 10 years, and long-term bonds (T-Bonds) from 10 to 30 years. Among these, the most traded are the 10-year bonds, mainly bought and sold for investment purposes.

An important concept here is the 'yield.' It’s the expected return when buying a bond divided by its purchase price, and the key point is that this yield fluctuates in real-time in the market. When demand is high, bond prices rise, causing U.S. Treasury yields to fall; when demand drops, the opposite happens. In other words, bond prices and yields move inversely. This reflects investor sentiment.

What are the benefits of investing in U.S. Treasuries? First, the U.S. government guarantees repayment, so the risk is almost zero. This is why investors flock to them during economic downturns. Second, fixed interest rates allow predictable returns, making them ideal for retirees or those needing regular income. Third, because they are actively traded in the bond market, liquidity is high—you can sell anytime before maturity. Fourth, there are tax benefits: interest is subject to federal taxes but exempt from state and local taxes.

Of course, there are risks. When interest rates rise, existing bonds lose value. If you sell before maturity, you could incur losses. Inflation is also a concern: if prices rise faster than U.S. Treasury yields, real returns decrease. For Korean investors, exchange rate fluctuations matter too—if the dollar weakens, your returns in won could diminish. Lastly, there is credit risk, but since the U.S. government’s credit rating is very high, this risk is negligible.

So, how can you buy U.S. Treasuries? There are three ways. First is direct purchase: buying directly from the U.S. Department of the Treasury via the TreasuryDirect website or through securities firms in the secondary market. The advantage is no commission and receiving interest regularly if held to maturity. The downside is a maximum purchase limit of $10,000 at a time, and managing multiple bonds can be complicated. Selling after interest rates rise could lead to losses. This method suits conservative investors, especially retirees seeking stable long-term income.

The second is bond funds: pooling money from multiple investors to create a diversified bond portfolio managed by professionals. The benefit is risk diversification and the ability to start with small amounts. Professionals also adjust the portfolio based on market conditions. The downside is management fees that can reduce returns and lack of direct control over individual bonds. This approach is good for investors who want professional management but prefer not to handle individual bonds themselves.

The third is bond index funds, or ETFs: funds that track specific bond indices, usually with lower fees than regular funds. They can be bought and sold freely on stock exchanges, offering good liquidity. However, they are affected by market volatility, and due to fees and transaction costs, they may not perfectly track the index. Also, active management by fund managers is limited. This method is suitable for investors who want low-cost exposure and trust in index tracking.

For Korean investors, a smart approach is to diversify by combining Korean and U.S. Treasuries. This spreads regional and currency risk. Economic downturns in one country can be offset by growth in another, and currency fluctuations can be partially hedged. For example, if the won weakens, the dollar-denominated value of U.S. bonds in won terms rises.

A few precautions when investing include: first, managing exchange rate risk. Hedging with derivatives like forward contracts can lock in rates but also forgo potential gains from favorable movements. Partial hedging is another option. Second, consider duration, which measures a bond’s sensitivity to interest rate changes; longer durations mean higher sensitivity, so mixing short-term bonds can reduce interest rate risk. Third, be mindful of taxes: U.S. bond interest is subject to U.S. federal tax, but Korea may also tax it. Fortunately, the Korea-U.S. double taxation treaty helps avoid double taxation.

Let’s consider a concrete example: a balanced portfolio with 50% Korean bonds and 50% U.S. Treasuries. This diversification reduces reliance on a single economy. When the dollar is strong, the unhedged U.S. bond portion yields higher returns in won; when the dollar weakens, the hedged portion prevents exchange losses.

In conclusion, understanding and investing in U.S. Treasury yields is key to building a stable portfolio. Choose the method—direct purchase, fund, or ETF—that suits your situation and risk appetite. For Korean investors, combining Korean and U.S. bonds can enhance diversification. Making wise choices based on your financial goals and investment horizon is essential.