Zero-Coupon Bond Singapore: How T-Bills Earn You Interest Without Coupon Payments
A zero-coupon bond is a debt instrument sold at a discount to its face value and redeemed at full face value at maturity, with the difference representing the investor’s return instead of periodic interest payments. Singapore’s 6-month and 1-year Treasury Bills (T-bills) are the most common zero-coupon instruments available to retail investors.
Not financial advice. All figures for educational reference only. Data as at July 2026.
Key Takeaways
- A zero-coupon bond pays no periodic interest – the entire return comes from buying it below face value and receiving the full face value at maturity.
- Singapore’s 6-month and 1-year T-bills are structured as zero-coupon instruments, issued at a discount and redeemed at par (S$1,000 per unit) on maturity.
- Unlike Singapore Savings Bonds, which pay step-up interest every six months, T-bills lock in a single yield determined at auction for the entire tenure.
- T-bills cannot be redeemed early at par the way SSBs can – selling before maturity means selling at the prevailing secondary market price, which may be above or below the price paid.
- Because there are no coupon payments, zero-coupon bond pricing is highly sensitive to the yield used to discount the face value – a small change in yield has a proportionally larger effect on price the longer the maturity.
What Is a Zero-Coupon Bond?
Most bonds pay the holder a fixed “coupon” – a periodic interest payment – throughout the bond’s life, then return the face value at maturity. A zero-coupon bond skips the periodic payments entirely: investors buy it at a discounted price and simply wait to receive the full face value later. The gap between the discounted purchase price and the S$1,000 face value is the investor’s entire return, functioning economically like interest even though no cash changes hands until maturity.
In Singapore, the clearest example available to retail investors is the Treasury Bill (T-bill), issued by the Monetary Authority of Singapore (MAS) on behalf of the government in 6-month and 1-year tenures. Corporate zero-coupon bonds also exist but are far less common in the Singapore retail market than T-bills.
How Does a Zero-Coupon Bond Work in Singapore?
At each T-bill auction, MAS determines a cut-off yield based on bids received. Successful bidders pay a price below S$1,000 per unit calculated from that yield, and receive exactly S$1,000 per unit when the T-bill matures. Because there is no coupon, the entire yield is embedded in the discount at purchase.
| Instrument | Structure | Tenure | Interest Payment |
|---|---|---|---|
| Singapore T-Bill | Zero-coupon (sold at discount) | 6 months or 1 year | None – paid at maturity as the discount |
| Singapore Savings Bond (SSB) | Coupon-bearing, step-up | Up to 10 years | Every 6 months, rising over time |
| SGS Bond (standard) | Coupon-bearing, fixed rate | 2-30 years | Every 6 months, fixed rate |
Source: MAS Monetary Authority of Singapore bonds and bills programme, as at July 2026.
Zero-Coupon Bond Example
At a recent 6-month T-bill auction, the cut-off yield was 3.00% per annum. An investor applying for S$10,000 face value pays approximately S$9,850 upfront (the exact discount reflects the 6-month yield calculation) and receives the full S$10,000 at maturity six months later – a gain of roughly S$150, equivalent to the 3.00% annualised yield over the half-year period.
Advantages of a Zero-Coupon Bond
- Predictable, locked-in return known at the point of purchase, since the discount and maturity value are both fixed at auction.
- No reinvestment risk on coupons – because there are no periodic payments to reinvest, the investor’s realised return matches the quoted yield exactly if held to maturity.
- Backed by the Singapore Government in the case of T-bills, making credit risk effectively negligible.
- Short tenures (6 months or 1 year) suit investors who want to park cash without long-term lock-in.
- Simple to understand – the return is just the gap between purchase price and the guaranteed S$1,000 redemption value.
Risks and Limitations
- No early redemption at par – unlike SSBs, T-bills must be sold on the secondary market if cash is needed before maturity, at a price that may be below the purchase price.
- Interest rate risk before allotment – between application and the auction date, market yields can move, affecting the price investors ultimately pay.
- No periodic income – investors who want regular cash flow (for example, retirees drawing income) may prefer a coupon-bearing bond instead.
- Reinvestment risk at maturity – when the T-bill matures, the prevailing yield for the next issue may be lower, especially in a falling rate environment.
- Allotment is not guaranteed at the full applied amount if an auction is oversubscribed, particularly for smaller retail bids.
Zero-Coupon T-Bill vs Singapore Savings Bond (SSB)
| Feature | T-Bill (Zero-Coupon) | Singapore Savings Bond |
|---|---|---|
| Interest structure | Discount to face value, no coupons | Step-up coupon every 6 months |
| Tenure | 6 months or 1 year | Up to 10 years |
| Early exit | Sell on secondary market only | Redeem monthly at par, no penalty |
| Yield certainty | Fixed at auction for full tenure | Rises the longer you hold |
| Best for | Short-term cash parking | Flexible medium-term savings |
See our T-Bill, SSB & Fixed Deposit Comparison Calculator to compare current yields side by side.
The Bottom Line
For Singapore investors, T-bills are the most accessible zero-coupon bond, offering a government-backed, fixed return over a short 6-month or 1-year horizon with no periodic payments to manage. They suit cash parking better than income generation – investors who need flexibility or regular payouts are usually better served by an SSB or a coupon-bearing SGS bond instead.
Frequently Asked Questions
Are Singapore T-bills the same as zero-coupon bonds?
Yes – Singapore’s 6-month and 1-year T-bills are structured as zero-coupon instruments, sold at a discount to face value and redeemed at par with no periodic coupon payments.
How is the yield on a zero-coupon bond calculated?
The yield is derived from the gap between the discounted purchase price and the S$1,000 face value redeemed at maturity, annualised over the bond’s tenure.
Can I sell a T-bill before it matures?
Yes, on the secondary market through a broker, but the sale price depends on prevailing market yields at the time and may be above or below what you originally paid.
Why would I choose a T-bill over an SSB if there is no periodic interest?
T-bills often offer a comparable or higher short-term yield with a shorter commitment period, which suits investors parking cash for 6-12 months rather than seeking multi-year flexibility.
Is a zero-coupon bond riskier than a normal coupon-paying bond?
Government-issued zero-coupon T-bills carry negligible credit risk, but their price is more sensitive to interest rate changes if sold before maturity, since all the return is embedded in a single discount rather than spread across coupons.