Basics of U.S. Bond Investment: Understanding the Relationship Between Interest Rates and Yields

As global economic uncertainties increase, the importance of asset allocation is coming to the forefront. U.S. Treasury Bonds are recognized as the flagship safe assets in the global financial markets, attracting many investors seeking a balance between yield generation and principal protection. This article explores the structure of U.S. Treasury Bonds, compares investment pathways, and examines currency hedging strategies and portfolio construction options that Korean investors should consider.

Basic Bond Concepts: Exchange of Assets and Liabilities

A bond is essentially a borrowing agreement. The bondholder(investor)provides capital to the borrower, who in turn repays the principal(face value)at the specified maturity and pays periodic(typically semiannual or annual) interest payments.

The government issues ‘Treasury Bonds’ to finance national operations. This involves borrowing from institutions and individual investors, with interest paid as compensation. The most actively traded instrument in the Treasury bond market is the U.S. 10-year Treasury Note, which is widely used as a trading instrument for investment purposes.

Classification and Characteristics of U.S. Bonds by Maturity

U.S. Department of the Treasury issues bonds categorized into three types based on maturity:

T-bill(Treasury Short-term Securities): Maturities under 1 year, representing U.S. short-term debt securities, with virtually no credit risk and very high liquidity. Suitable for short-term cash needs and safe asset storage.

T-note(Treasury Medium-term Securities): Maturities from 1 to 10 years, offering moderate yields. Preferred by investors seeking a balance of stability and income.

T-bond(Treasury Long-term Securities): Maturities from 10 to 30 years, offering fixed interest rates. Highly favored during economic downturns, becoming core assets for portfolio diversification.

The Mechanism of Interest Rates and Yield Relationships

Role of Benchmark Rates

U.S. Treasury yields, especially the 10-year yield, serve as benchmarks in the global financial market. They function as the risk-free rate reference point and are used as indicators of the macroeconomic health of the world economy.

Generally, longer maturities entail greater future uncertainty, so long-term yields should be higher than short-term yields. However, during economic downturns, investors tend to flock to long-term bonds, causing long-term yields to fall and short-term yields to rise relatively, often signaling a recession.

Yield( and Its Inverse Relationship with Price

Yield is the expected annual return on a bond, calculated by dividing the anticipated annual income by the purchase price. In the secondary market, bond prices and yields always move inversely.

• Increased demand → bond prices rise → yields fall
• Decreased demand → bond prices fall → yields rise

This inverse relationship reflects market sentiment and expectations.

Four Core Attractions of U.S. Treasury Bonds

) 1. Absolute Safety

Backed by the U.S. government’s repayment guarantee, U.S. Treasury Bonds are the highest credit-rated debt instruments globally. They are a quintessential safe asset, especially during economic downturns, with virtually no risk of default.

2. Fixed Income Stream

Interest rates are fixed at issuance, with regular### typically semiannual( interest payments guaranteed. Ideal for retirees and conservative investors seeking stable income.

) 3. Excellent Liquidity

The U.S. Treasury Bond market boasts extremely high trading volume. Bonds can be held to maturity or sold easily when needed, facilitating cash flow management and effective portfolio diversification.

4. Tax Advantages

Interest income is subject to federal tax but exempt from###State( and local taxes), resulting in a relatively higher after-tax return.

Four Major Risks of U.S. Treasury Bond Investment

( 1. Interest Rate Risk)

Rising interest rates cause new bonds to be issued at higher yields, reducing the market value of existing bonds. Selling before maturity in a rising rate environment may lead to losses. This risk is more pronounced with long-term bonds.

2. Inflation Risk(

With fixed interest rates, if inflation exceeds the bond’s yield, real purchasing power diminishes. Treasury Inflation-Protected Securities (TIPS) adjust for inflation, but standard bonds do not have such protections.

) 3. Currency Risk###

A key consideration for foreign investors. A weakening dollar reduces the KRW-denominated value, lowering real returns. For Korean investors, fluctuations in the USD/KRW exchange rate directly impact returns.

( 4. Credit Risk)

While the possibility of U.S. government default is theoretically present, it is extremely low in practice, supported by the U.S. government’s top credit rating.

Investment Methods for U.S. Treasury Bonds: Comparing Three Pathways

( 1. Direct Purchase

Investors can buy directly from the U.S. Department of the Treasury via TreasuryDirect or through securities firms’ secondary markets.

Advantages:

• Direct ownership of bonds, full control over trading decisions
• No management fees unlike mutual funds or ETFs
• Full principal repayment and interest receipt if held to maturity

Disadvantages:

• Purchase limit via TreasuryDirect: up to $10,000 per transaction
• Requires significant capital and management effort for diversification
• Potential need to sell before maturity at a discount if interest rates rise

Suitable for: Conservative investors seeking predictable, long-term safety investments, planning to hold bonds until maturity, such as retirees relying on regular income.

) 2. Bond Funds###Mutual Funds(

Fund managers pool investor funds to create and manage diversified portfolios including U.S. Treasury Bonds.

Advantages:

• Diversification across multiple bonds reduces individual bond risk
• Professional management adapts to market conditions
• Small investments enable access to diversified bond portfolios

Disadvantages:

• Management fees can erode returns
• No direct control over individual bonds within the fund

Suitable for: Investors who prefer to avoid managing individual bonds and seek professional diversification, aiming for stable long-term income with risk mitigation.

) 3. Bond Index Funds###ETFs(

Passive funds tracking specific bond indices, e.g., U.S. Treasury Bond indices, following a passive management style.

Advantages:

• Significantly lower management costs compared to active funds
• High liquidity due to stock exchange trading
• Transparent index tracking with predictable performance

Disadvantages:

• Subject to market volatility, despite bond stability
• Tracking error may cause performance deviations from the index
• Lack of active management benefits in changing market conditions

Suitable for: Investors seeking low-cost U.S. Treasury exposure, trusting in index tracking efficiency, and preferring independent investment without active management.

Optimizing Portfolio: U.S. and Korean Treasury Bonds

) Diversification Importance

Combining Korean and U.S. Treasury Bonds achieves geographical and currency diversification, reducing risks such as:

• Asynchronous economic cycles across countries
• Political instability or interest rate fluctuations specific to one country
• Currency risk managed through dual currency holdings (KRW and USD)

Yield Optimization

If Korean Treasury yields are higher at similar maturities, investors can maintain core U.S. holdings while increasing Korean bond exposure to enhance returns. Additionally, widening interest rate differentials may create arbitrage opportunities (Carry Trade).

Practical Strategies for Korean Investors

(# Strategy 1: Currency Hedging) (Currency Hedging)

Korean investors’ main concern is USD/KRW exchange rate fluctuations. Hedging involves using derivatives like forward contracts to lock in future exchange rates.

Advantages: Eliminates currency risk Disadvantages: Hedging costs reduce net returns###Opportunity Cost(

Optimal approach: Hedge only a portion of the investment capital, leaving the rest unhedged. This allows capturing additional gains if the dollar appreciates while mitigating losses if it depreciates. During dollar strength phases, unhedged U.S. Treasury holdings can outperform.

)# Strategy 2: Duration Matching( (Duration Matching)

Duration measures a bond’s sensitivity to interest rate changes, representing the average time to recover invested capital.

• Long-term asset preservation: Use long-maturity U.S. Treasury Bonds for stable, predictable cash flows
• Interest rate sensitivity reduction: Incorporate short-term bonds or U.S. short-term securities to minimize impact of rate fluctuations

Managing the duration of both Korean and U.S. bonds aligns with investment goals and risk appetite.

)# Strategy 3: Tax Optimization

U.S. bond interest is taxed federally but may be subject to double taxation with Korean taxes. The Korea-U.S. tax treaty(DTA) aims to prevent double taxation, but application can be complex. Consulting a tax professional beforehand is essential.

Example: Balanced Portfolio Construction

Consider a balanced portfolio with 50% Korean bonds and 50% U.S. Treasury Bonds.

This setup:

• Achieves principal preservation and income generation simultaneously
• Minimizes impact of economic downturns in either country
• Benefits from exchange rate movements: in a dollar-strong phase, unhedged U.S. bonds increase in value; in a weak dollar phase, hedged portions buffer against losses.

Conclusion

U.S. Treasury Bonds are a key component of long-term asset allocation for both individual and institutional investors. Understanding interest rate movements, inflation, exchange rate fluctuations, and credit risks is fundamental to successful management.

For Korean investors, combining U.S. Treasury Bonds with domestic bonds can enhance portfolio stability. Selecting from various maturities, direct purchases, funds, or ETFs according to investment goals and risk preferences is crucial. Incorporating strategies like currency hedging, duration management, and tax optimization tailored to Korean investors can make U.S. Treasury Bonds an effective tool for global asset allocation.