Understanding How Treasury Bills Work

Quick answer

• Treasury Bills (T-Bills) are short-term debt obligations issued by the U.S. Department of the Treasury.
• They are considered very low-risk investments because they are backed by the full faith and credit of the U.S. government.
• T-Bills are sold at a discount to their face value and mature at face value, with the difference representing your interest.
• Maturities typically range from a few days to 52 weeks.
• You can buy T-Bills directly from TreasuryDirect or through a broker.
• They are exempt from state and local income taxes, but not federal income tax.

Who this is for

• Investors seeking a safe place to park cash for a short period.
• Individuals looking for an investment with minimal risk and a predictable return.
• Those who want to diversify their portfolio with a government-backed security.

What to check first (before you act)

Goal and timeline

Before investing in Treasury Bills, define why you are investing and for how long. Are you saving for a down payment in six months, or do you have excess cash you want to earn a modest return on for a year? Your timeline will help determine the appropriate T-Bill maturity.

Current cash flow

Understand your regular income and expenses. This will help you determine how much money you can comfortably allocate to T-Bills without impacting your ability to cover immediate needs or other financial goals.

Emergency fund or safety buffer

Ensure you have a robust emergency fund in place before investing in T-Bills. This fund should cover 3-6 months of essential living expenses in an easily accessible account, separate from your T-Bill investments. T-Bills are not ideal for immediate emergencies due to potential penalties or the need to sell before maturity.

Debt and interest rates

Evaluate any outstanding debts. If you have high-interest debt (like credit card debt), it often makes more financial sense to pay that down before investing in low-yield T-Bills. Compare the interest rates on your debt to the potential returns of T-Bills.

Credit impact

Investing in Treasury Bills does not directly impact your credit score. However, managing your overall financial health, including paying bills on time and managing debt, is crucial for maintaining good credit.

Step-by-step (simple workflow)

1. Determine your investment amount

What to do: Decide how much money you want to invest in Treasury Bills.
What “good” looks like: You’ve identified an amount that won’t jeopardize your emergency fund or essential expenses.
Common mistake and how to avoid it: Investing money needed for short-term expenses. Avoid this by first ensuring your emergency fund is fully funded and your immediate cash flow needs are met.

2. Choose a maturity date

What to do: Select the T-Bill maturity period (e.g., 4 weeks, 13 weeks, 26 weeks, 52 weeks) that aligns with your financial goal timeline.
What “good” looks like: The maturity date matches when you anticipate needing access to the funds.
Common mistake and how to avoid it: Choosing a maturity that’s too short or too long for your needs. Avoid this by clearly defining your goal’s timeframe before selecting a maturity.

3. Decide where to buy

What to do: Choose between buying directly from TreasuryDirect.gov or through a brokerage account.
What “good” looks like: You’ve selected a platform that fits your comfort level and existing financial relationships.
Common mistake and how to avoid it: Not exploring both options. Avoid this by briefly comparing the ease of use and any potential fees associated with each.

4. Open an account (if needed)

What to do: If using TreasuryDirect, you’ll need to open an account. If using a broker, you might already have one.
What “good” looks like: Your account is set up and verified.
Common mistake and how to avoid it: Delaying account setup. Avoid this by starting the process early, as verification can sometimes take a few days.

5. Place your bid (for TreasuryDirect auctions)

What to do: Submit a non-competitive or competitive bid for the T-Bill at auction. Non-competitive bids guarantee you’ll get the T-Bill at the average auction price.
What “good” looks like: Your bid is successfully submitted before the auction deadline.
Common mistake and how to avoid it: Missing the auction deadline or misunderstanding bid types. Avoid this by carefully noting auction dates and times and understanding the difference between competitive and non-competitive bids.

6. Purchase through a broker

What to do: If using a broker, simply select the T-Bill you want and place an order, similar to buying stocks.
What “good” looks like: Your order is filled at the prevailing market price.
Common mistake and how to avoid it: Not checking the current yield or price. Avoid this by confirming the purchase price and the implied yield before executing the trade.

7. Fund your purchase

What to do: Transfer the necessary funds to your TreasuryDirect or brokerage account.
What “good” looks like: The funds are available in your account to cover the purchase.
Common mistake and how to avoid it: Insufficient funds. Avoid this by ensuring the exact purchase amount, including any small fees, is deposited.

8. Receive your T-Bill confirmation

What to do: You will receive confirmation of your T-Bill purchase.
What “good” looks like: You have a record of your investment, including the face value, purchase price, and maturity date.
Common mistake and how to avoid it: Not keeping records. Avoid this by saving all confirmation emails or statements for your records.

9. Hold until maturity

What to do: Keep the T-Bill until its maturity date.
What “good” looks like: You haven’t needed to sell the T-Bill before it matures.
Common mistake and how to avoid it: Selling early out of necessity or panic. Avoid this by only investing money you are confident you won’t need before maturity.

10. Receive your principal back

What to do: On the maturity date, the full face value of the T-Bill will be deposited into your TreasuryDirect or brokerage account.
What “good” looks like: You have received the full principal amount back, plus the implied interest earned.
Common mistake and how to avoid it: Forgetting where the funds were deposited. Avoid this by knowing which account your T-Bills are held in and checking it on or around the maturity date.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Investing emergency fund money	Inability to cover unexpected expenses, leading to debt or selling T-Bills at a loss if rates rise.	Keep emergency funds in a separate, highly liquid account (e.g., high-yield savings).
Not understanding T-Bill pricing (discount vs. face value)	Confusion about actual returns and how interest is earned.	Educate yourself on how T-Bills are sold at a discount and mature at face value.
Forgetting about maturity dates	Funds may not be available when needed, or they may sit idle earning little interest.	Keep a calendar or use alerts for maturity dates.
Selling T-Bills before maturity	Potential to sell at a loss if market interest rates have risen, or incurring fees.	Only invest funds you are certain you won’t need until maturity.
Miscalculating tax implications	Unexpected tax liability on interest earned at the federal level.	Remember that T-Bill interest is taxable federally but exempt from state and local taxes.
Investing funds needed for near-term goals	Missing out on potential gains if the market moves favorably, or being forced to sell at an inopportune time.	Match T-Bill maturity to your specific short-term financial goals.
Not comparing T-Bill yields to other short-term options	Potentially earning less than you could elsewhere for similar risk.	Regularly check current T-Bill yields against other safe investments like money market funds.
Bidding competitively without understanding market dynamics	Potentially paying more than necessary for the T-Bill.	For most individual investors, non-competitive bids are simpler and safer.
Not having a brokerage account if you prefer that method	Inability to access T-Bills through a preferred platform.	Set up a brokerage account in advance if you plan to buy T-Bills through a broker.

Decision rules (simple if/then)

• If you need immediate access to funds, then do not invest in T-Bills because they are designed for short-term holding periods, and early withdrawal can be inefficient.
• If you have high-interest debt, then prioritize paying down that debt before investing in T-Bills because the guaranteed return from debt repayment often exceeds T-Bill yields.
• If your primary goal is capital preservation with minimal risk, then T-Bills are a suitable option because they are backed by the U.S. government.
• If you are saving for a goal within the next year, then choose a T-Bill maturity that aligns with your timeline because this avoids the need to sell early.
• If you are comfortable with a slightly more complex process and want to potentially influence your purchase price, then consider competitive bidding at auction, because non-competitive bids are simpler and guarantee you’ll receive the T-Bill.
• If you already have a brokerage account, then buying T-Bills through your broker might be more convenient because you can manage all your investments in one place.
• If you want to avoid state and local income taxes on your investment earnings, then T-Bills are a good choice because their interest is exempt from these taxes.
• If you have a substantial amount of cash you want to earn a modest, safe return on for a few months, then T-Bills are a good consideration because they offer a predictable outcome.
• If you are unsure about auction dates and processes, then stick to buying T-Bills on the secondary market through a broker or use the TreasuryDirect “Bills” section for non-competitive purchases, because these are generally more straightforward.
• If you are looking for a very short-term parking spot for cash (e.g., a few days to a few weeks), then T-Bills with very short maturities (like 4-week bills) can be appropriate, because they offer a quick turnaround.
• If you are investing a large sum and are comfortable with a bit more research, then understand the difference between competitive and non-competitive bids, because competitive bids allow you to set a maximum yield you’re willing to accept.

FAQ

What is the difference between a Treasury Bill and a Treasury Note?

Treasury Bills have maturities of one year or less, while Treasury Notes have maturities of 2 to 10 years. Both are considered very safe investments backed by the U.S. government.

How do I buy Treasury Bills?

You can buy T-Bills directly from the U.S. Treasury at TreasuryDirect.gov or through a licensed broker or bank. TreasuryDirect allows for non-competitive bids, which are simpler for most individual investors.

Are Treasury Bills safe?

Yes, Treasury Bills are considered one of the safest investments available because they are backed by the full faith and credit of the U.S. government. The risk of default is extremely low.

How is interest earned on a Treasury Bill?

T-Bills are sold at a discount to their face value. For example, you might buy a $1,000 T-Bill for $990. When the T-Bill matures, you receive the full $1,000 face value. The $10 difference is your interest.

What are the tax implications of Treasury Bills?

The interest earned on Treasury Bills is subject to federal income tax but is exempt from state and local income taxes. This can be a significant benefit for residents of high-tax states.

Can I sell a Treasury Bill before it matures?

Yes, you can sell T-Bills on the secondary market before their maturity date. However, if market interest rates have risen since you purchased the T-Bill, you might have to sell it at a discount, potentially resulting in a loss.

What is an auction for Treasury Bills?

The Treasury sells new T-Bills through regular auctions. Investors submit bids, and the Treasury determines the yield (interest rate) based on demand. You can participate in these auctions directly or through a broker.

What is the minimum investment for Treasury Bills?

The minimum investment for Treasury Bills is typically $100, though some brokers may have different minimums.

What this page does NOT cover (and where to go next)

• Detailed tax strategies: While T-Bills offer tax advantages, more complex tax planning may require consulting a tax professional.
• Secondary market trading strategies: This guide focuses on buying and holding. Advanced strategies for trading T-Bills on the secondary market are not covered.
• Comparison with other short-term investments in detail: While mentioned, a deep dive into comparing T-Bills with money market funds, CDs, or short-term bond funds is beyond this scope.
• International investor considerations: This guide is for U.S. investors. Rules and availability for international investors differ.