What are Inflation-Indexed Bonds? Know Here!

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  • 29 Dec 2023
What are Inflation-Indexed Bonds? Know Here!

Key Highlights

  • Inflation-indexed bonds are designed to shield investors from the eroding effects of inflation on their investments.
  • The principal amount of these bonds adjusts based on changes in the inflation rate.
  • While the principal adjusts with inflation, inflation-indexed bonds typically offer a fixed interest rate.
  • Governments often issue these bonds, offering investors a tool to hedge against inflation.

Inflation-indexed bonds, also known as IIBs, constitute a specific type of bond crafted to provide investors with protection against the escalating effects of inflation—characterized by the gradual increase in the overall price level of goods and services within an economy. The detrimental impact of inflation on the purchasing power of money and its potential to create economic instability necessitate measures to counteract these effects. In this context, inflation-indexed bonds act as a safeguard against inflation by offering a fixed rate of return that accommodates changes in the inflation rate. Both the principal amount and interest payments associated with these bonds undergo adjustments to preserve their real value, ensuring that investors' holdings remain insulated from the adverse impacts of inflation.

Inflation-indexed bonds function differently from conventional bonds, particularly concerning their interest payments. The principal amount and interest payments undergo adjustments based on inflation, utilizing the Consumer Price Index (CPI). This adjustment ensures that the real value of the investment is preserved. Typically, a fixed interest rate is established at the bond's issuance, and this rate is combined with the inflation rate to determine the total interest payment. To illustrate the workings of Inflation-Indexed Bonds, consider an example: Assume an investor acquires an IIB with a face value of Rs. 10,000, a ten-year maturity, and a coupon rate set at 3% above inflation.

In the first year, if the inflation rate is 4% at the bond's issuance, the investor receives an annual interest payment of Rs. 312 (3% of INR 10,400).

Should the inflation rate rise to 5% in the second year, the investor would then receive an annual interest payment of Rs. 327.60 (3% of INR 10,920). Importantly, the coupon rate remains consistently set at 3% above the inflation rate throughout the entire ten-year duration. This process persists until the bond matures, ensuring that the investor receives a fixed income stream that dynamically adjusts to keep pace with inflation, thereby offering a hedge against the eroding effects of rising prices over time.

1. Inflation Protection: The purpose of index-linked inflation bonds is to protect investors' tangible assets from the depreciating impacts of inflation.

2. Flexible concept: To protect the actual value of the investment, the principal amount of these bonds is modified in response to variations in the inflation rate.

3. Interest Rate Adjustments: Interest payments are tied to inflation; the total interest payment is usually calculated by adding a fixed interest rate to the inflation rate.

4. Consumer Price Index (CPI): The Consumer Price Index (CPI), a widely used indicator of inflation that considers changes in the price of a basket of goods and services, is frequently used to make inflation adjustments.

5. Government Issued: Governments typically issue inflation-indexed bonds as a financial instrument to raise capital while providing investors with a hedge against inflation.

How do you calculate the interest on an inflation-indexed bond?

Inflation-indexed bonds connect their principal amount to inflation, increasing the principal value with inflation rises. The calculation for interest payments on these bonds involves a formula that takes into account the current level of deficit finance. To break it down, if inflation is, let's say, 3%, and the bond's interest rate is 5%, the interest payment is determined by adding 5% of the current principal value to 3% of the original principal value.

Investors can acquire inflation-indexed bonds, including government websites, banks, and brokerages. In India, the primary methods for purchasing these bonds are through Inflation Indexed National Saving Securities - Cumulative and Index Funds. These bonds, issued by the Indian government, serve as a tool to help savers safeguard their money from the eroding effects of inflation. Purchases can be made through banks, brokerages, and online platforms, giving investors flexibility.

1. Maintenance of Purchasing Power: By guaranteeing that the actual value of their investment will be maintained, investors can lessen the adverse effects of inflation on their purchasing power.

2. Continuous Real Returns: Investors can receive a constant income stream adjusted for changes in the cost of living through index-linked inflation bonds, which offer a source of returns that keeps up with inflation.

3. Diversification: Including inflation-indexed bonds as a counterbalance to other asset classes in a diversified portfolio can be a risk management tactic, particularly in inflationary times.

4. Government Assistance: These bonds offer investors a reasonably safe investment choice since, being government-issued securities, they frequently have a high creditworthiness rating.

5. Predictable Income: Fixed interest rates, coupled with adjustments for inflation, contribute to predictable income for investors, enhancing financial planning and stability.

6. Long-Term Consideration: Suited for investors with a long-term perspective, inflation-indexed bonds become more advantageous over extended periods as they consistently address the impact of inflation on returns.

  • Low Yields: Inflation bonds typically offer lower yields than regular bonds, potentially diminishing their appeal to investors.

  • Limited Availability: Inflation-indexed bonds are not as readily accessible as regular bonds, posing challenges for investors seeking portfolio diversification.

  • Market Risk: Investing in inflation-indexed bonds carries a degree of market risk, as fluctuations in interest rates and economic factors can impact their prices.

  • Liquidity Risk: These bonds may have lower liquidity than regular bonds, making it challenging for investors to sell their holdings when necessary.

  • Counterparty Risk: There is a risk of the issuer defaulting on obligations, leading to potential losses for investors.


Inflation-indexed bonds present an effective means for investors to preserve their purchasing power over time. Distinguished by their unique mechanism of adjusting both principal amounts and interest payments in response to inflation, these bonds offer distinct advantages despite certain drawbacks. While it is crucial for investors to be aware of the associated risks, seeking guidance from a financial advisor or conducting thorough research is recommended before considering these bonds for investment. Additionally, the necessity of a Demat account for holding investments in electronic format should be taken into account as part of the investment process.

FAQs on Inflation Indexed Bonds

Inflation-indexed bonds carry risks such as low yields, limited availability, market risk due to interest rate fluctuations, liquidity risk, and counterparty risk if the issuer defaults.

Inflation-indexed bonds are linked to a specific measure of inflation, often the Consumer Price Index (CPI), to adjust their principal and interest payments.

Inflation-indexed bonds are typically pegged to the prevailing inflation rate, using an established index like CPI to ensure adjustments for changes in purchasing power.

Governments usually issue inflation-indexed bonds as financial instruments to raise capital while providing investors with a hedge against inflation.

Inflation-indexed bonds are designed to protect against inflation by adjusting their principal and interest payments based on changes in inflation rates, preserving purchasing power.

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