What it means
Think of Treasury Bills as short-term IOUs issued by the national government to cover its daily cash flow needs. When you buy a T-Bill, you are essentially lending money to the government for a set duration, which can range from four weeks to fifty-two weeks.
Because the government backs them, the risk of losing your core investment is practically zero, making them a cornerstone of conservative financial planning. Unlike traditional bonds, Treasury Bills do not pay regular interest instalments.
Instead, they are sold at a discount to their face value. You buy the bill for less than it is worth, and when it reaches its maturity date, the government pays you the full face value.
Your profit is the difference between the discounted purchase price and the final payout. For non-finance managers and business owners, T-Bills are a practical tool for managing idle cash.
If your company has set aside money for a future tax bill or upcoming expansion, leaving that cash in a low-yield current account means losing purchasing power to inflation. Moving those funds into short-term T-Bills generates a safe return while keeping the cash accessible within a year.
In practice, purchasing T-Bills is straightforward through a bank or government auction platform. They offer high liquidity, meaning you can easily sell them before they mature if an unexpected cash need arises.
While the returns are usually lower than riskier investments like stocks, the absolute safety and predictability make them an essential parking spot for surplus corporate funds. Buying a Treasury Bill is like purchasing a brand-new gift card with a $50 value for $45 from a trusted friend, knowing they will definitely redeem it for the full $50 in six months.
In practice
Real-world examples
Example 1
As an independent software consultant, Sarah holds $50,000 in her business savings. She buys a six-month Treasury Bill for $49,200. At maturity, she receives $50,000, securing an $800 risk-free return, which is about 1.6% over six months.
Example 2
A mid-sized manufacturing firm sets aside $200,000 for its annual equipment upgrade. To earn interest safely, the finance manager invests the cash in three-month Treasury Bills, generating steady, low-risk returns. When each bill matures, the cash is either reinvested or moved to the operating account, depending on when the equipment order is due.
Example 3
A retail startup receives a large venture capital injection. While planning how to spend the funds over the next year, the founder puts $100,000 into short-term Treasury Bills to protect the capital from inflation. Because the bills mature at different dates, part of the money returns every few months to cover payroll.
Think of it
Buying a Treasury Bill is like purchasing a brand-new gift card with a fifty pound value for forty-five pounds from a trusted friend, knowing they will definitely redeem it for the full fifty pounds in six months.
Formula
Calculation
Discount Yield = ((Face Value - Purchase Price) / Face Value) x (365 / Days to Maturity) x 100. For example, buying a $10,000 T-Bill for $9,800 maturing in 182 days: (($10,000 - $9,800) / $10,000) x (365 / 182) x 100 = 0.02 x 2.005 x 100 = 4.01% annual discount yield.
The discount yield understates what you actually earn, because it divides by the face value rather than the price you paid. The investment yield uses the purchase price: ($200 / $9,800) x (365 / 182) x 100 = 0.0204 x 2.005 x 100 = 4.09% a year. Both figures describe the same $200 of profit earned over 182 days.Case study
Seen in the real world
This is a fictional, illustrative scenario. GreenLeaf Logistics, a mid-sized delivery firm, accumulated $500,000 in surplus cash after a profitable quarter. The managing director knew this money was needed to pay annual vehicle insurance and corporate taxes in six months, so leaving it in a zero-interest business bank account made little sense. Seeking a safe, conservative option, the finance team decided to invest the surplus into six-month Treasury Bills. They purchased $500,000 face-value of T-Bills at a discounted price of $488,000.
Over the six-month holding period, GreenLeaf earned a guaranteed $12,000 profit. Once the bills matured, the cash returned to their operating account precisely when the insurance premiums and tax bills fell due. The $12,000 gain on the $488,000 invested is about 2.5% over six months, or roughly 4.9% a year. This simple strategy turned idle funds into a reliable income stream without exposing the company to market volatility or liquidity risks.
Watch out
Common mistakes
- Confusing Treasury Bills with long-term government bonds, which carry higher interest rate risk.
- Assuming T-Bills pay regular monthly or semi-annual interest instead of realising gains only at maturity.
- Locking up operating cash for too long without keeping a portion in more liquid daily accounts.
Questions
People also ask
Are Treasury Bills completely safe?
They are backed by the national government, making them virtually risk-free regarding default, though they are subject to inflation risk.
Can I sell a Treasury Bill before it matures?
Yes, T-Bills can be sold on the secondary market before their maturity date, though market prices may fluctuate slightly based on prevailing interest rates.
How do I purchase Treasury Bills for my business?
You can buy them directly through the national debt management office website or via most commercial banks and brokerage accounts.