Treasury Bills in Nigeria: The Complete Guide

If you’ve been hearing about Treasury bills and wondering what they actually are, you’re not alone. Most Nigerians hear “T-bill” and assume it’s something reserved for bankers and wealthy investors. It isn’t.

A Treasury bill is a short-term loan you give to the Federal Government. You lend them money; they pay you back with interest in 91, 182, or 364 days. No share prices to track, no earnings reports to read, no waking up wondering if your investment crashed overnight — just a date on the calendar and money in your account.

This guide covers everything: how T-bills work, how much you actually need, how the returns are calculated, how to buy them through a bank, app, or broker, and what to watch out for. If you’re completely new to fixed income, our complete guide to fixed income investments in Nigeria gives you the broader picture first.

Some links in this guide are referral or affiliate links. If you open an account through them, we may earn a small commission or bonus at no extra cost to you. We only recommend platforms we’ve researched and believe are beginner-friendly.

Quick Answer: What Is a Treasury Bill?

A Treasury bill is a short-term debt instrument issued by the Central Bank of Nigeria (CBN) on behalf of the Federal Government. You buy it at a discount to its face value and receive the full face value at maturity — the difference is your profit. For example, buying a 364-day T-bill with a ₦100,000 face value at an 18% discount rate costs roughly ₦82,000 upfront; at maturity you receive the full ₦100,000.

Treasury bills are widely considered among the lowest-risk investments available in Nigeria — the government has historically not defaulted on local-currency debt, though a clean historical record describes the past, not a guarantee about the future.

How Treasury Bills Work

Primary Market: The CBN Auction

T-bills are issued through auctions, the CBN conducts it approximately every two weeks, across three tenors — 91, 182, and 364 days. Investors submit bids stating how much they want to invest and at what discount rate. The CBN reviews all bids and sets a stop rate — the highest rate at which it will sell. Bid at or below the stop rate and you get an allocation; bid too high and you may not.

Most individual investors don’t bid directly — their bank, app, or broker bids on their behalf. You simply specify the amount and tenor, and the platform handles the rest.

Secondary Market: Selling Before Maturity

Once issued, T-bills can trade on the secondary market through the FMDQ Securities Exchange. If you need your money before maturity, you can sell to another investor — but this carries price risk. If interest rates have risen since you bought, your T-bill may sell at a discount, meaning you could get back less than you paid. Holding to maturity avoids this risk entirely.

At Maturity

The CBN automatically credits the full face value to your account on the maturity date. No action needed — you can then reinvest, spend it, or move it elsewhere.

How Returns Are Calculated: Discount Rate vs. True Yield

This is where most beginners get confused. T-bills are quoted using a discount rate, but that’s not your actual return — your actual return is the true yield (or effective yield), which is higher than the discount rate because you’re earning interest on a smaller upfront amount than the face value.

Worked example: Buy a 364-day T-bill with a ₦100,000 face value at an 18% discount rate:

• Upfront cost: approximately ₦82,000
• Profit at maturity: approximately ₦18,000
• True yield: approximately 22%

 Always ask for the true yield, not just the quoted discount rate — the difference matters more as the amount grows. Run your own numbers with our Treasury Bill Calculator.

How Much Do You Need to Start?

The minimum depends entirely on where you buy — same government security, same underlying safety, very different entry points.

Why the Minimum Varies

At the primary market, the CBN auctions T-bills in large denominations (minimum bid threshold of ₦50,000,000). Banks pool customer funds to meet that threshold but typically require each individual to contribute at least ₦100,000.  

Investment apps pool thousands of small investors together and submit one combined bid, letting you own a proportional share based on what you contributed — this is what enables minimums as low as ₦10,000.

Stockbrokers vary the most. Some target small investors with low minimums; others, particularly full-service firms with dedicated wealth management desks, may require considerably more. 

Is ₦10,000 Enough to Start?

Yes, in the sense that it’s enough to learn the process and see your first profit at maturity — though the absolute return on a small amount will naturally be modest. At an 18% discount rate, ₦10,000 might generate roughly ₦1,800–₦2,000 in gross return over 364 days, with 10% withholding tax reducing that further. Small, but real, and it builds the habit and familiarity that make larger investments feel less intimidating later.

Should You Wait Until You Have More?

Not necessarily. Starting with what you have today and building the habit of investing regularly tends to matter more than optimizing for a slightly better rate on a larger sum you’re still saving toward. You can always add more at the next auction.

What Different Amounts Can Buy (Illustrative, at ~18-20% Discount Rate)

These are illustrations based on assumed rates, not a forecast — actual auction rates change every two weeks.

What Determines Treasury Bill Rates?

Rates aren’t fixed — they move at every auction based on:

• CBN monetary policy — when the Central Bank raises or lowers its policy rate, T-bill rates tend to follow
• Inflation expectations — investors demand higher rates when they expect inflation to rise
• Banking-system liquidity — excess cash in the system tends to push rates down; tight liquidity tends to push them up
• Government borrowing needs — higher borrowing needs can mean more attractive rates to draw investors in

Check current rates directly at cbn.gov.ng rather than relying on any figure in this article, since rates change every auction cycle.

Taxation

Treasury bill returns carry a 10% withholding tax, deducted automatically at source before the money reaches you — if your T-bill earns ₦18,000 in profit, you receive approximately ₦16,200 after tax. No separate filing is required. For the full picture across all fixed income instruments, see our tax on fixed income guide.

Risks You Should Know

“Safe” doesn’t mean “no risk.” Four risks apply specifically to T-bills:

• Inflation risk — if your T-bill earns 20% but inflation runs at 25%, your real return is negative even though the nominal number looks fine. Use our Inflation Rate Tracker to check this.
• Liquidity risk — locking into a 364-day tenor means your money isn’t accessible without selling on the secondary market, potentially at a loss, if an emergency arises before maturity
• Reinvestment risk — if rates fall by the time your T-bill matures, you’ll reinvest at a lower rate than before; laddering different tenors helps manage this
• Default risk — historically very low for government instruments in Nigeria, though “historically low” describes the past record, not a permanent guarantee

For the full breakdown with mitigation strategies, see our fixed income risks guide.

How to Buy Treasury Bills in Nigeria

Method 1: Through Your Bank

Minimum: ₦100,000

• Step 1: Visit your bank branch or check their internet banking portal — most commercial banks (GTB, UBA, Access, Zenith, First Bank, and others) offer T-bill purchases.

• Step 2: Complete the Treasury bill subscription form — your full name (matching your BVN and account name exactly), investment amount, tenor (91, 182, or 364 days — shorter tenors offer more flexibility, longer ones typically offer slightly higher rates), and the bank account for returns.

• Step 3: The bank debits the discounted amount, not the full face value — for a ₦500,000 face-value 364-day T-bill at a 20% discount rate, expect roughly ₦400,000 debited, not ₦500,000.

• Step 4: The bank bids at the CBN auction on your behalf and confirms your allocation and exact discount rate within a few days.

• Step 5: You receive a T-bill certificate — keep it safe as proof of investment. At maturity, the CBN automatically credits the full face value.

Method 2: Through an Investment App

Minimum: As low as ₦10,000

Step 1: Download and register on an app. Options include:

• Bamboo — Android / iOS — referral code if request: realwinner
• i-invest — Android / iOS — referral code: U289242

Step 2: Fund your wallet via bank transfer, debit card, or USSD.

Step 3: Navigate to the fixed income/Treasury bills section, review the available tenors and current indicative rate.

Step 4: Enter your investment amount — the app pools your funds with other investors and submits a combined bid, allocating you a proportional share.

Step 5: Confirm and wait for the auction result — you’ll be notified of your exact discount rate, and your position is tracked in-app.

Trade-offs to know: you don’t hold the T-bill directly in your own name — it sits in a pooled custodial account, which is still legally yours but structured differently — and effective yields may run slightly lower than a direct bank purchase since the platform takes a cut.

Method 3: Through a Licensed Stockbroker

Minimum: Varies significantly — see the broker table above; confirm current figures directly

Options include Afrinvest, CardinalStone, and Stanbic IBTC.

Step 1: Contact your broker and ask about their T-bill process and current rates.

Step 2: Complete their subscription form — similar to a bank’s, covering your details, amount, and tenor.

Step 3: Fund your brokerage account with the discounted amount; the broker handles the auction bidding.

Step 4: Once the auction completes, your allocation appears in your brokerage statement alongside any stocks you hold — useful if you want a single dashboard for both.

What Happens After You Invest

Auction day — the CBN holds its auction, typically every two weeks; your platform submits your bid on your behalf.

Auction result — the CBN publishes the stop rate; your platform confirms your allocation and exact rate within a few days.

Settlement — the discounted amount is debited, and you receive either a certificate (banks) or a confirmation notification (apps/brokers).

During the tenor — nothing to do. There’s no price to track day-to-day; just note the maturity date.

At maturity — the CBN automatically credits the full face value. No application or request needed.

Common Mistakes to Avoid

Frequently Asked Questions

Key Takeaways

• A Treasury bill is a short-term loan to the Federal Government, bought at a discount and repaid at full face value at maturity
• Your true yield is higher than the quoted discount rate — always ask for the true yield before comparing options
• Minimum investment ranges from ₦10,000 (apps) to ₦100,000 (banks), with broker minimums varying by firm
• T-bill returns carry a 10% withholding tax, deducted automatically
• Rates change every two weeks at CBN auctions — check current rates directly rather than relying on any figure in this guide
• Hold to maturity to avoid price risk; ladder your tenors to manage reinvestment risk

This content is for educational purposes only and does not constitute financial advice. All investments carry risk, including the possible loss of capital. Rates, minimums, and tax treatments change over time — please verify current information directly with your chosen platform and consult a licensed financial advisor before making any investment decision.