Key Takeaways
- Principal and coupons adjust with inflation.
- Protects investors from inflation eroding returns.
- Includes deflation protection via principal floors.
- Breakeven rate guides bond investment choice.
What is Index-Linked Bond?
An index-linked bond is a fixed-income security whose principal and interest payments adjust according to an inflation index like the Consumer Price Index (CPI). This adjustment protects your investment’s purchasing power by linking returns directly to inflation changes.
Unlike traditional bonds with fixed payments, these bonds help you hedge against inflation risk by ensuring that both principal and coupon payments rise when inflation increases.
Key Characteristics
Index-linked bonds offer unique features designed to preserve real returns amid inflation. Key traits include:
- Inflation Adjustment: Principal and coupon payments adjust based on inflation indices, maintaining the bond’s real value.
- Deflation Protection: Many offer a floor on the principal value at maturity to prevent losses during deflation.
- Real Yield Focus: They pay returns above inflation, unlike nominal bonds that pay fixed interest.
- Issuer Types: Primarily issued by sovereign governments, but also by utilities and municipalities.
- Breakeven Inflation Rate: The critical metric comparing yields with traditional bonds to gauge expected inflation.
How It Works
Index-linked bonds adjust principal and interest payments in line with changes in a specified inflation index. When inflation rises, the principal increases proportionally, and coupons are calculated on the adjusted principal, preserving your real income.
This mechanism hinges on the discounted cash flow principle, where future payments reflect inflation adjustments to maintain purchasing power. The indexation factor is determined by dividing the CPI at maturity by the CPI at issuance, ensuring your returns keep pace with inflation.
Examples and Use Cases
Index-linked bonds are valuable in various investment contexts where inflation protection is critical:
- Government Bonds: Treasury Inflation-Protected Securities (TIPS) are widely used for long-term inflation hedging.
- Corporate Issuers: Some companies issue inflation-linked securities; for example, investors may consider bond ETFs like BND for diversified bond exposure including inflation protection.
- Portfolio Immunization: These bonds are effective tools for immunization strategies, shielding portfolios from inflation risk.
Important Considerations
While index-linked bonds mitigate inflation risk, you should consider their typically lower nominal yields compared to regular bonds. Assess the breakeven inflation rate carefully to decide if inflation expectations justify their use in your portfolio.
Also, liquidity may vary depending on the issuer and market. To diversify risk and gain exposure, you might explore bond ETFs that include index-linked securities, balancing inflation protection with ease of trading.
Final Words
Index-linked bonds offer a reliable way to preserve purchasing power by adjusting returns for inflation. To determine if they fit your portfolio, compare current yields and inflation expectations before investing.
Frequently Asked Questions
An index-linked bond is a type of fixed-income security where both the principal and interest payments are adjusted based on changes in an inflation index, like the Consumer Price Index (CPI). This adjustment helps protect investors against inflation by maintaining the bond's purchasing power over time.
Index-linked bonds adjust their principal and coupon payments in line with inflation changes. When inflation rises, the bond's principal and interest payments increase proportionally, ensuring that the real value of returns is maintained despite inflation.
There are two primary types: C-linkers, where the coupon rate adjusts with inflation but the principal remains fixed, and P-linkers, where the principal adjusts with inflation and the coupon is recalculated based on the adjusted principal. Governments typically issue P-linkers, while commercial banks often issue C-linkers.
The breakeven inflation rate is the inflation level at which investors would earn the same return from an index-linked bond as from a conventional bond. It helps investors decide which bond to choose based on their inflation expectations.
The principal is adjusted using an indexation factor, which is calculated by dividing the inflation index (like CPI) at maturity by the index at issuance. This factor increases the principal amount to reflect inflation changes over the bond's life.
Yes, most index-linked bonds include deflation protection by setting a par value floor at maturity. This means the principal cannot fall below its original value even if inflation turns negative, protecting investors from losses due to deflation.
Investors should consider index-linked bonds when the breakeven inflation rate is below their inflation expectations. This suggests that actual inflation might outpace the breakeven rate, making index-linked bonds a better option to preserve real returns.


