Understanding Fixed Income Yield in Nigeria: Discount Rate vs True Yield
If you’ve ever looked at a Treasury bill quote and wondered why the rate they advertise isn’t what lands in your pocket, you’re not alone. The difference between a discount rate and a true yield trips up more Nigerian fixed-income investors than almost anything else—and it can make an investment look better or worse than it really is.
The good news is that once you understand the two or three ways yield is quoted, the confusion disappears. You’ll be able to look at any Treasury bill auction result, any bond coupon, or any broker’s quote and know exactly what your actual return will be—before you commit a single naira.
This guide explains how fixed income yield works in Nigeria: discount rate vs true yield for Treasury bills, coupon rate vs current yield for bonds, and how to calculate your real return after tax and inflation. If you’re completely new to fixed income, the complete beginner’s guide to fixed income investments gives you the full landscape.
Quick Answer: Discount Rate vs True Yield
| Concept | What It Tells You | Used For |
|---|---|---|
| Discount Rate | The percentage discount applied to the face value of a Treasury bill | Quoting T‑bill auction results |
| True Yield (Effective Yield) | Your actual annualised return based on the money you invested | Comparing T‑bill returns with other investments |
| Coupon Rate | The fixed interest rate a bond pays on its face value | Quoting bond interest payments |
| Current Yield | The bond’s annual coupon divided by the price you paid | Comparing bonds bought at a discount or premium |
| Yield to Maturity (YTM) | Total return including coupon payments and capital gain/loss at maturity | Comparing bonds with different prices |
What Is Yield?
Yield is simply the return you earn on your investment, expressed as a percentage per year. But not all yields are calculated the same way—and the number you see on a screen isn’t always the number that matters.
In Nigerian fixed income, the way yield is quoted depends on the instrument. Treasury bills use a discount rate. Bonds use a coupon rate. Both can be converted into a true yield—which is the only number that tells you what you’re actually earning on the money you put in.
The quoted yield is your nominal return. After adjusting for inflation, you get your real return—which tells you whether your purchasing power actually grew.
Discount Rate: How Treasury Bill Returns Are Quoted
When the CBN auctions Treasury bills, the results are published using a discount rate. This is the percentage by which the face value of the bill is discounted to arrive at the price you pay.
Let’s say a 364‑day T‑bill has a face value of ₦100,000 and the stop rate (discount rate) at the auction is 20%. The calculation looks like this:
- Discount: ₦100,000 × 20% = ₦20,000
- Upfront cost: ₦100,000 − ₦20,000 = ₦80,000
- Profit at maturity: ₦20,000
The discount rate tells you the size of the discount—but it doesn’t tell you your actual return. Why? Because you didn’t invest ₦100,000. You invested ₦80,000. Your return should be calculated on what you actually put in, not on the face value.
True Yield: What You Actually Earn
The true yield (also called effective yield) converts the discount into an annualised percentage based on the money you invested—not the face value.
True Yield Formula
True Yield = (Profit ÷ Amount Invested) × 100
Using the same example:
- True yield: (₦20,000 ÷ ₦80,000) × 100 = 25%
That’s a full 5 percentage points higher than the discount rate. For a given discount rate, longer tenors generally produce a larger gap between the quoted discount rate and the investor’s effective return.
Here’s a quick reference table for a 364‑day T‑bill:
| Face Value | Discount Rate | Upfront Cost | Profit | True Yield |
|---|---|---|---|---|
| ₦100,000 | 18% | ₦82,000 | ₦18,000 | ~22% |
| ₦500,000 | 20% | ₦400,000 | ₦100,000 | ~25% |
| ₦1,000,000 | 22% | ₦780,000 | ₦220,000 | ~28% |
Want to skip the maths?
Use our Treasury Bill Calculator to instantly convert discount rates into true yields and estimate your after-tax return.
For a complete walkthrough on buying T‑bills, see the guide to buying Treasury bills in Nigeria.
Coupon Rate vs Current Yield for Bonds
Bonds use a different system. Instead of a discount, they pay regular interest based on a coupon rate—a fixed percentage of the face value.
If you buy a ₦1,000,000 FGN bond with a 15% coupon, you’ll receive ₦150,000 in interest each year, split into two semi‑annual payments of ₦75,000. That coupon rate is fixed—it doesn’t change for the life of the bond.
Current Yield Formula
Current Yield = Annual Coupon ÷ Purchase Price × 100
But the current yield depends on what you actually paid. If you bought the bond at face value, your current yield equals the coupon rate. If you bought it on the secondary market at a discount—say ₦900,000—your current yield is higher:
- Current yield: (₦150,000 ÷ ₦900,000) × 100 = 16.67%
If you paid a premium—say ₦1,100,000—your current yield falls:
- Current yield: (₦150,000 ÷ ₦1,100,000) × 100 = 13.64%
The coupon rate never changes, but the price you pay determines your actual return. For more on how bonds work, see the FGN bonds explained guide.
Yield to Maturity: The Full Picture for Bonds
Current yield is useful, but it ignores one important factor: the difference between what you paid and the face value you’ll receive at maturity. Yield to maturity (YTM) accounts for both the coupon payments and any capital gain or loss.
If you buy a bond at a discount (below face value), you not only collect interest—you also get back more than you paid at maturity. That extra gain pushes your YTM above the current yield. If you buy at a premium (above face value), the opposite happens.
YTM is the most complete measure of a bond’s return, but it’s also the most complex to calculate by hand.
After‑Tax and Real Yield: What You Actually Keep
Even true yield doesn’t tell the full story. Two more factors affect what your money is truly worth.
After‑Tax Yield
Treasury bills, fixed deposits, corporate bonds, and commercial papers are subject to a 10% withholding tax. FGN bonds are tax‑exempt. If you earn ₦100,000 in T‑bill profit, you receive ₦90,000 after tax—so your after‑tax yield is lower than the quoted rate.
Always compare after‑tax yields when deciding between taxable and tax‑exempt instruments. For a full breakdown, see the tax on fixed income investments guide.
Real Yield (After Inflation)
Even if you pay zero tax, inflation eats into your returns. If your T‑bill earns 22% but inflation is running at 28%, your real yield is ‑6% —you lost purchasing power despite earning a positive return.
Use our Nigerian Inflation Rate Tracker to monitor current inflation before locking in long tenors.
Yield Comparison Summary Table
| Measure Used For | Best for | Comparison? |
|---|---|---|
| Discount Rate | Treasury Bills | No |
| True Yield | Treasury Bills | Yes |
| Coupon Rate | Bonds | No |
| Current Yield | Bonds | Better |
| Yield to Maturity (YTM) | Bonds | Best |
Common Mistakes When Comparing Yields
| S/N | Mistake | What to Do Instead |
|---|---|---|
| 1 | Comparing discount rate with coupon rate | Convert everything to true yield or YTM before comparing |
| 2 | Ignoring tax differences | Compare after‑tax yields, especially when choosing between FGN bonds and T‑bills |
| 3 | Forgetting about inflation | A high nominal return means nothing if your real return is negative |
| 4 | Using the face value to calculate T‑bill returns | Always use your actual investment amount (the discounted price) |
| 5 | Confusing current yield with total return | For bonds, consider YTM if you plan to hold to maturity |
Frequently Asked Questions
Why is true yield higher than the discount rate?
Because the discount rate is calculated using the bill’s face value, while true yield is calculated using the smaller amount you actually invested. For example, if you pay ₦80,000 and receive ₦100,000, your true yield is 25%—even though the discount rate is 20%.
What is the difference between discount rate and true yield?
The discount rate is the percentage discount applied to a Treasury bill’s face value. True yield is your actual annualised return based on the money you invested. True yield is always higher than the discount rate.
How do I calculate true yield on a Treasury bill?
Use the formula: (Profit ÷ Upfront Cost) × 100. For example, if you pay ₦80,000 and receive ₦100,000 at maturity, your true yield is (₦20,000 ÷ ₦80,000) × 100 = 25%.
What is a good yield on fixed income in Nigeria?
It depends on the instrument and market conditions. In 2026, true yields on Treasury bills have ranged from 18% to 24%, while FGN bond coupons have ranged from 12% to 18%. Always compare after‑tax and after‑inflation returns.
Is the coupon rate the same as the yield on a bond?
No. The coupon rate is the fixed percentage of face value the bond pays annually. The yield depends on the price you paid. If you bought the bond at a discount, your yield is higher than the coupon rate.
How do I compare returns across different fixed income instruments?
Convert everything to a true annualised yield, then adjust for tax and inflation. This gives you a level playing field for comparison.
What is nominal vs real return?
Nominal return is the quoted yield before inflation. Real return is your nominal return minus inflation. It tells you whether your purchasing power actually increased.
Related Guides
- Treasury Bills in Nigeria Explained — How they work, true yields, and risks
- How to Buy Treasury Bills in Nigeria — Step‑by‑step bank, app, and broker methods
- Treasury Bill Calculator — Estimate your returns before you invest
- FGN Bonds Explained — Standard bonds, tax benefits, and secondary market access
- Tax on Fixed Income Investments — What you’ll pay and what’s exempt
Key Takeaways
- The discount rate quoted at Treasury bill auctions is not your actual return. True yield—based on the money you invested—is always higher.
- For bonds, the coupon rate is fixed, but your current yield depends on the price you paid.
- Yield to maturity gives the most complete picture of a bond’s total return.
- After‑tax yield and real yield (after inflation) show what you actually keep in purchasing power.
- Understanding fixed income yield in Nigeria helps you compare investments accurately and avoid costly misunderstandings.
Your Next Step
Next time you see a Treasury bill auction result or a bond quote, convert the quoted rate into a true yield before you compare it with anything else. Use our Treasury Bill Calculator to do it in seconds, and if you’re looking at bonds, the FGN Bond Calculator will help.
For a broader understanding of how to choose between instruments once you know the yields, see the best fixed income investments in Nigeria guide. And for the complete fixed income picture, return to the beginner’s guide to fixed income.
Let’s hear from you.
Have you ever been caught off guard by the gap between a quoted rate and what you actually earned? Drop a comment below. I read every single one, and your experience might help another investor avoid the same confusion.
If this guide helped you understand yield better, share it with someone who’s still comparing discount rates with coupon rates as if they were the same thing.
Disclaimer: This content is for educational purposes only and does not constitute financial advice. All investments carry risk, including the possible loss of capital. Rates and yields are based on market conditions as of mid‑2026 and may change. Please do your own research or consult a licensed financial advisor before making any investment decision.
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