When looking to grow your Kwacha in Zambia’s fixed-income market, the two primary instruments issued by the Bank of Zambia (BoZ) on behalf of the government are Treasury Bills (T-Bills) and Government Bonds (GRZ Bonds).
While both are sovereign debt instruments designed to preserve capital and yield higher returns than standard bank savings accounts, they serve fundamentally different financial strategies. Deciding where to place your cash comes down to your liquidity needs, investment timeline, and preferred cash flow structure.
This guide breaks down the core distinctions between T-Bills and GRZ Bonds to help you decide which security aligns best with your portfolio goals.
1. Investment Timeline (Tenors)
The most defining difference between the two instruments is their lifespan:
- Treasury Bills (Short-Term): T-Bills are short-term money market instruments with maturities of 1 year or less. They are auctioned in four specific tenors: 91 days (3 months), 182 days (6 months), 273 days (9 months), and 364 days (1 year).
- Government Bonds (Long-Term): GRZ Bonds are long-term capital market securities maturing across 2, 3, 5, 7, 10, and 15 years.
Takeaway: If you are saving for a short-term goal (like school fees or business working capital next year), T-Bills keep your money accessible. If you are investing for long-term objectives (like retirement or generational wealth), GRZ Bonds lock in yields for years.
2. Payout Mechanisms: Discounted Basis vs. Semi-Annual Coupons
How you make money differs significantly between these two securities:
TREASURY BILL (Zero-Coupon)
[Buy at Discount] ---------------------------------------------> [Maturity: Receive Full Face Value]
(No interim payouts)
GOVERNMENT BOND (Coupon-Bearing)
[Buy at Par/Discount] ──> [Coupon] ──> [Coupon] ──> [Coupon] ──> [Maturity: Face Value + Final Coupon]
(Every 6 Months)
Treasury Bills: Discounted Securities
T-Bills do not pay explicit interest payments while you hold them. Instead, they are sold at a discount to face value and mature at full face value. Your profit is the upfront discount.
- Example: You apply for a 364-day T-Bill with a face value of ZMW 10,000. If the effective yield rate is 12%, you only pay ZMW 8,800 at settlement. At maturity (one year later), the Bank of Zambia pays you the full ZMW 10,000. The ZMW 1,200 difference represents your return.
Government Bonds: Semi-Annual Coupons
GRZ Bonds are coupon-bearing instruments. When you buy a bond, you receive fixed interest payments (coupons) every six months based on the bond’s coupon rate, and your full principal is returned on the maturity date.
- Example: If you purchase a 5-year GRZ Bond with a face value of ZMW 50,000 at a 15% coupon rate, you will receive ZMW 3,750 (gross) every six months for 5 years. At the end of year 5, you receive your last coupon plus your original ZMW 50,000 principal back.
3. Comparative Summary
| Feature | Treasury Bills (T-Bills) | Government Bonds (GRZ Bonds) |
| Primary Objective | Capital preservation & short-term growth | Long-term yield & semi-annual cash flow |
| Lifespan/Tenors | 91 to 364 days | 2 to 15 years |
| Payout Structure | Single lump sum at maturity (bought at discount) | Semi-annual interest coupons + principal at maturity |
| Auction Frequency | Fortnightly (every two weeks) | Monthly |
| Yield Environment | Typically lower than long-term bonds | Typically higher to compensate for duration risk |
| Reinvestment Risk | High (must re-bid frequently as bills mature) | Low (yield locked in for up to 15 years) |
| Minimum Bid | ZMW 1,000 (Non-Competitive) | ZMW 1,000 (Non-Competitive) |
4. Key Factors to Consider Before Choosing
Reinvestment Risk vs. Rate Lock-In
If interest rates are high and the Bank of Zambia begins lowering the central policy rate, holding a long-term GRZ Bond allows you to lock in high double-digit coupon rates for 5, 10, or 15 years.
With T-Bills, because they mature within a year, you face reinvestment risk: when your 364-day bill matures, prevailing market auction rates might be significantly lower, forcing you to roll over your money at a lower yield.
Cash Flow Requirements
If you rely on passive income to supplement living expenses or business cash flows, GRZ Bonds provide a predictable income stream landing in your bank account twice a year. T-Bills generate no intermediate cash flow; all profits are realized upon maturity.
Inflation & Secondary Market Liquidity
Longer-term bonds carry higher duration and inflation risk. If inflation accelerates over a 10-year period, a fixed coupon rate loses real purchasing power over time. Additionally, if you need to liquidate a 10-year bond before maturity, you must sell it on the secondary market via a commercial bank or broker, where price fluctuations can lead to capital gains or losses.
5. Decision Matrix: Which Should You Buy?
Choose Treasury Bills if:
- You have funds reserved for commitments within the next 3 to 12 months.
- You prefer short-term capital parking without locking money away for multi-year horizons.
- You want to compound your wealth rapidly by re-bidding principal plus earned returns every 91 to 364 days.
Choose Government Bonds if:
- You want to build a passive income stream through semi-annual coupon payouts.
- You want to lock in favorable, high yields for a decade or more.
- You are investing long-term funds (e.g., retirement, children’s tertiary education funds).
Final Strategy: The Hybrid Approach
You do not have to choose strictly between one or the other. Many experienced investors in Zambia maintain a hybrid strategy:
- Keep short-term liquidity reserves in 364-day Treasury Bills to address annual financial commitments.
- Place core wealth into 5-year or 10-year GRZ Bonds to secure long-term fixed cash flow.
Ready to take the next step? Check out our complete step-by-step guide on How to Buy Government Bonds in Zambia or return to our central portal for Government Bonds in Zambia.