Interest Rate Risk Bonds Singapore

Interest Rate Risk Bonds Singapore

Singapore Investing Glossary | The Kopi Notes

Interest rate risk in bond investing refers to the risk that rising interest rates will cause the market price of a bond to fall. In Singapore, this is a key consideration for holders of Singapore Government Securities (SGS bonds), Singapore Savings Bonds (SSB), and corporate bonds. Bonds with longer durations are more sensitive to rate changes than short-duration bonds or T-bills.

For educational purposes only. Not financial advice.

Interest Rate Risk Bonds Singapore Singapore

Table of Contents

Why Bond Prices Fall When Interest Rates Rise
Why Bond Prices Fall When Interest Rates Rise
What Is Duration and Why It Matters
What Is Duration and Why It Matters
Interest Rate Risk in the Singapore Context
Interest Rate Risk in the Singapore Context
How to Manage Interest Rate Risk
How to Manage Interest Rate Risk
Interest Rate Risk vs Credit Risk
Interest Rate Risk vs Credit Risk

Why Bond Prices Fall When Interest Rates Rise

Bond prices and interest rates have an inverse relationship. When you buy a bond at a fixed coupon rate, if market rates rise, newly issued bonds offer higher coupons, making your existing bond less attractive. Its market price falls so its effective yield matches the new, higher market rates.

Example: You buy a 10-year SGS bond at par ($1,000) with a 3% coupon. If yields rise to 4%, your bond’s market price must fall to approximately $918 so its yield to maturity equals 4%.

What Is Duration and Why It Matters

Duration (measured in years) is the primary measure of a bond’s sensitivity to interest rate changes. Modified Duration estimates price change for a 1% rate move — if Modified Duration is 7, a 1% rise in rates causes approximately a 7% price fall.

A Singapore T-Bill (3-month or 6-month) has near-zero duration and is essentially immune to interest rate risk — which is why they are popular for parking cash in a rate-rising environment.

Interest Rate Risk in the Singapore Context

Key facts for Singapore fixed income investors as at Q1 2026:

  • Singapore Savings Bonds (SSB): Redeemable at any time with no capital loss — zero interest rate risk from a capital perspective
  • T-Bills: 6-month T-bills have very short duration and minimal price risk, auctioned biweekly
  • SGS Bonds (medium to long term): 10–30 year SGS bonds have significant duration risk. In 2022–2023, SGS bond prices fell sharply as global rates rose rapidly

For a Singapore investor building a bond ladder, mixing short-duration T-bills and SSBs with medium-term SGS bonds balances yield and rate risk.

How to Manage Interest Rate Risk

1. Shorten duration in rising rate environments. Shift from long-term bonds to short-term T-bills or SSBs when rates are rising.

2. Use a bond ladder. A bond ladder staggers bond maturities so you are regularly reinvesting at current market rates.

3. Stick to SSBs for rate-risk-free fixed income. SSBs allow early redemption at any time with no capital loss.

4. Consider bond ETFs for liquidity. Bond ETFs listed on SGX provide diversified exposure but carry NAV sensitivity to interest rate moves.

Interest Rate Risk vs Credit Risk

Interest rate risk is distinct from credit risk:

  • Interest rate risk: Rising rates cause your bond’s market price to fall — affects ALL bonds including Singapore Government Securities
  • Credit risk: The risk that the bond issuer defaults or is downgraded — mainly applies to corporate bonds, not SGS bonds

When evaluating high yield bonds or investment grade bonds in Singapore, always assess both the duration (interest rate risk) and the issuer’s credit rating (credit risk).

Frequently Asked Questions

What is interest rate risk in bonds?
Interest rate risk is the risk that rising interest rates will cause the market price of your existing bonds to fall. New bonds issued at higher rates become more attractive, reducing demand for your lower-yielding bond.
How does interest rate risk affect Singapore bond investors?
Singapore investors holding medium to long-term SGS bonds or corporate bonds face price declines when interest rates rise. Short-term T-bills and Singapore Savings Bonds are largely immune.
What is bond duration and how does it relate to interest rate risk?
Duration measures how sensitive a bond’s price is to interest rate changes. A modified duration of 5 means the bond’s price will fall approximately 5% for every 1% rise in interest rates.
Which Singapore bonds have the lowest interest rate risk?
Singapore Savings Bonds (SSBs) have the lowest interest rate risk — you can redeem them at any time with no capital loss. T-bills also have minimal interest rate risk due to very short duration.
How can I reduce interest rate risk in my Singapore bond portfolio?
Invest in short-duration bonds or T-bills, use a bond ladder to spread maturities, hold Singapore Savings Bonds for risk-free fixed income, and avoid long-duration corporate bonds in a rising rate environment.

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