Interest Rate Risk Singapore: Why Rising Rates Hurt Bond and REIT Prices
The inverse relationship every Singapore fixed-income and S-REIT investor needs to understand.
Interest rate risk is the risk that the market value of a fixed-income investment, such as a bond or bond-like instrument, falls when prevailing interest rates rise, because existing fixed coupons become less attractive relative to newly issued debt offering higher rates.
Not financial advice. All figures for educational reference only. Data as at October 2026. Last updated: October 2026.
Table of Contents
Key Takeaways
- Bond prices and interest rates move inversely: when rates rise, existing fixed-rate bond prices generally fall, and vice versa.
- Duration is the standard measure of how sensitive a bond’s price is to a given change in interest rates — longer duration means greater sensitivity.
- S-REITs are particularly exposed to interest rate risk because they are often compared to bond yields by income investors and rely heavily on debt financing.
- An investor who holds a bond to maturity generally still receives the full face value regardless of interim price swings, but a REIT has no such maturity date.
- Rising rates can also raise a REIT’s actual borrowing costs on refinanced or floating-rate debt, directly reducing distributable income, which compounds the valuation effect.
What Is Interest Rate Risk?
Interest rate risk arises because a bond’s coupon is fixed at issuance, but market interest rates move continuously. If rates rise after a bond is issued, new bonds come to market offering higher coupons, making the older, lower-coupon bond relatively less attractive — so its market price must fall until its effective yield is competitive with newly issued debt. The reverse happens when rates fall: older higher-coupon bonds become relatively more attractive and their prices rise. This relationship affects not just government and corporate bonds but any income-generating asset that investors implicitly compare to bond yields, including Singapore REITs.
How Does Interest Rate Risk Work in Singapore?
Duration is the tool used to quantify this sensitivity: it estimates the approximate percentage change in a bond’s price for a 1 percentage point change in interest rates. A bond with a duration of 7 would be expected to fall roughly 7% in price if rates rose by 1 percentage point, all else equal. Generally, longer-maturity bonds have higher duration and are more sensitive to rate changes than short-dated instruments like T-Bills.
| Instrument Type | Typical Duration Sensitivity | Why |
|---|---|---|
| T-Bills (6-12 month) | Low | Very short time to maturity |
| 10-year SGS bond | Moderate to high | Long time to maturity, more future coupons affected |
| S-REIT units | Indirect, but often significant | Compared to bond yields by income investors; also has floating-rate debt exposure |
Source: General fixed-income duration principles
Interest Rate Risk Example
Suppose an investor holds a 10-year SGS bond with a duration of approximately 8, purchased when prevailing yields were 2.5%. If market yields rise to 3.5% — a 1 percentage point increase — the bond’s market price would be expected to fall by roughly 8%, even though nothing about the issuer’s creditworthiness changed. An investor who sold at that point would realise the loss; an investor who holds to maturity would still receive the full face value at the end, since the price decline is a mark-to-market effect, not a change in the bond’s ultimate repayment.
Advantages of Understanding Interest Rate Risk
- Better portfolio construction. Knowing a bond’s duration lets an investor estimate how much its price might move under different rate scenarios.
- Explains S-REIT price swings. Recognising this risk helps investors understand why REIT unit prices can fall sharply on rate-hike news even without any change to the underlying properties’ rental income.
- Informs laddering strategies. Investors can deliberately hold bonds or T-Bills of varying maturities to reduce overall sensitivity to any single rate move.
- Clarifies the hold-to-maturity safety net. Understanding this risk shows why bonds held to maturity are less risky than their interim price swings might suggest.
Risks and Limitations
- Can cause real losses if sold early. An investor forced to sell a bond or REIT holding during a rate-rise period may crystallise a loss that would not have occurred if they could hold longer.
- Compounds with REIT-specific debt costs. Rising rates can directly increase a REIT’s interest expense on refinanced debt, reducing distributable income on top of any valuation effect.
- Duration is an approximation. It assumes a small, parallel shift in rates and becomes less accurate for large rate moves or non-parallel yield curve changes.
- Hard to time. Predicting the direction and timing of interest rate changes is notoriously difficult, even for professional economists.
Interest Rate Risk vs Reinvestment Risk
These two risks are often confused but point in opposite directions.
| Feature | Interest Rate Risk | Reinvestment Risk |
|---|---|---|
| What happens when rates rise | Existing bond prices fall | Future reinvestment of coupons/maturities happens at better rates |
| What happens when rates fall | Existing bond prices rise | Future reinvestment happens at worse rates |
| Who it affects most | Holders of longer-duration bonds who may sell early | Holders of short-dated bonds or those receiving regular coupons |
Source: General fixed-income risk concepts
The Bottom Line
For Singapore fixed-income and S-REIT investors, interest rate risk is the single biggest reason prices can swing even when nothing fundamental has changed about the underlying business or bond issuer, and understanding duration is the first step to managing it deliberately rather than being surprised by it.
Frequently Asked Questions
Why do bond prices fall when interest rates rise?
Because new bonds are issued with higher coupons to match prevailing rates, making existing lower-coupon bonds less attractive, so their market price must fall until their yield becomes competitive.
What is duration in bonds?
Duration estimates the approximate percentage change in a bond’s price for a 1 percentage point change in interest rates, with higher duration meaning greater price sensitivity.
Why are S-REITs sensitive to interest rates?
S-REITs are often compared to bond yields by income-focused investors, and they typically rely on significant debt financing, so rising rates can both reduce their relative appeal and raise their actual borrowing costs.
Does interest rate risk matter if I hold a bond to maturity?
Less so for the final repayment, since you still receive the face value at maturity regardless of interim price swings, but it still matters if you need liquidity or want to sell before maturity.
How can I reduce interest rate risk in my portfolio?
Common approaches include holding shorter-duration instruments, laddering bond or T-Bill maturities, or simply planning to hold fixed-income investments to maturity rather than needing to sell early.