Treasury Bills Explained: The Safest 5% Return You’re Probably Ignoring

Treasury Bills Explained: The Safest 5% Return You’re Probably Ignoring

Most knowledge workers I know have a savings account sitting at 0.5% interest while inflation quietly erodes their purchasing power. They’ve heard of stocks, maybe dabbled in index funds, and definitely scrolled past crypto headlines. But Treasury bills? That’s something their grandparents talked about, right? Something dusty and bureaucratic that doesn’t belong in a modern portfolio.

Related: index fund investing guide

Wrong. Treasury bills — T-bills, for short — are currently offering returns in the 5% range, backed by the full faith and credit of the U.S. government, with maturities as short as four weeks. If you’re a salaried professional parking your emergency fund or short-term savings in a standard bank account, you’re leaving real money on the table. Let me break down exactly what T-bills are, how they work, and why they deserve a serious look from anyone between 25 and 45 who values both safety and returns.

What Exactly Is a Treasury Bill?

A Treasury bill is a short-term debt instrument issued by the U.S. Department of the Treasury. When you buy one, you’re essentially lending money to the federal government for a fixed period. In return, you get your principal back plus interest when the bill matures.

T-bills come in four standard maturities: 4-week, 8-week, 13-week (3-month), 26-week (6-month), and 52-week (1-year). Unlike bonds, T-bills don’t pay periodic interest. Instead, they’re sold at a discount to face value. You might pay $980 for a T-bill with a $1,000 face value, and when it matures, you receive the full $1,000. That $20 difference is your interest income.

This discount mechanism is important to understand because it affects how yields are quoted and calculated. The annualized yield you see advertised — currently hovering around 5% for many maturities — is derived from that discount rate. As the Federal Reserve has raised interest rates aggressively since 2022 to combat inflation, T-bill yields have climbed to levels not seen since before the 2008 financial crisis (Federal Reserve Bank of St. Louis, 2023).

Why Are T-Bills Considered the Safest Investment on Earth?

The phrase “risk-free rate” gets thrown around in finance textbooks, and it almost always refers to U.S. Treasury securities. This isn’t marketing language — it’s a technical designation rooted in a simple fact: the U.S. government has never defaulted on its debt obligations in the modern era. It has the legal authority to tax, and it controls the currency in which the debt is denominated.

Compare this to corporate bonds, which carry credit risk (the company could go bankrupt), or even high-yield savings accounts, where the bank is technically a counterparty that could fail. FDIC insurance protects bank deposits up to $250,000, but T-bills carry no counterparty risk at all. The U.S. Treasury itself is the counterparty, and the probability of a U.S. government default is, for all practical purposes, the benchmark against which all other financial risks are measured (Damodaran, 2022).

There’s also no market risk if you hold to maturity. Unlike stocks or long-term bonds, a 13-week T-bill will return exactly its face value in 13 weeks, period. You don’t need to watch financial news, time markets, or stress about quarterly earnings. This predictability is genuinely valuable, and for knowledge workers who already spend cognitive bandwidth managing demanding careers, that simplicity has real psychological worth.

The Current Yield Environment: Why Now Is Different

For most of the 2010s, T-bill yields were essentially zero. The Federal Reserve kept rates near the zero lower bound following the 2008 financial crisis, and savers were punished for being conservative. A T-bill yielding 0.05% wasn’t worth the administrative effort of buying one.

That world no longer exists. Following the Federal Reserve’s rate hiking cycle that began in March 2022, short-term Treasury yields climbed rapidly. By mid-2023, 6-month T-bills were consistently yielding above 5.4% — a return that beats the vast majority of high-yield savings accounts, money market funds, and certainly any standard bank savings product (U.S. Department of the Treasury, 2023).

Here’s the interesting part for ADHD brains like mine: the yield curve has been inverted for much of this period, meaning short-term T-bills were actually yielding more than longer-term bonds. You didn’t need to lock up your money for 10 or 30 years to get a competitive return. You could roll 4-week or 13-week T-bills repeatedly and capture yields that historically required taking on significant duration risk.

This environment won’t last forever. As the Fed eventually cuts rates, T-bill yields will decline. But right now, sitting in cash earning 0.5% when 5% is available for essentially the same risk profile is a financially indefensible position.

How to Actually Buy Treasury Bills

This is where people stop because they imagine complex brokerage accounts or intimidating government portals. The reality is much simpler than you’d expect.

Option 1: TreasuryDirect.gov

The U.S. Treasury runs a direct purchasing portal at TreasuryDirect.gov where you can buy T-bills directly from the government, bypassing any broker fees entirely. You link your bank account, create an account, and participate in Treasury auctions. T-bills are sold at auction every week, and you submit what’s called a non-competitive bid, meaning you agree to accept whatever yield the auction determines. You will always receive the auction yield — you don’t need to actively compete or negotiate anything.

The minimum purchase is $100, and you can set up automatic reinvestment (called “auto-roll”) so your T-bill proceeds are automatically reinvested into a new bill of the same maturity at each auction. For someone managing a short-term cash reserve, this is essentially a set-it-and-forget-it mechanism that captures current yields with almost no ongoing management.

Option 2: Brokerage Accounts

If you already use Fidelity, Schwab, Vanguard, or a similar platform, you can buy T-bills directly through your existing account’s fixed income marketplace. The interface is more familiar to most people, and you can see secondary market prices if you need to sell before maturity. Most major brokers offer T-bills with no transaction fees. The trade-off compared to TreasuryDirect is that you’re going through an intermediary, though this adds almost no meaningful risk for most investors.

One practical advantage of buying through a brokerage: if you need to access your money before the T-bill matures, you can sell it on the secondary market. T-bills are highly liquid — they’re among the most traded securities in the world — so exiting a position before maturity is straightforward, though your actual yield may differ slightly from the original rate depending on where rates have moved (Fabozzi, 2021).

Option 3: Treasury ETFs and Money Market Funds

For people who want T-bill exposure without managing individual purchases, several ETFs hold exclusively short-term Treasuries. The iShares 0-3 Month Treasury Bond ETF (SGOV) and similar products provide daily liquidity, automatic reinvestment, and instant diversification across T-bill maturities. The expense ratios are very low (typically 0.05–0.15%), and the yield closely tracks current T-bill rates minus that small fee.

Government money market funds, like those offered by Vanguard or Fidelity, serve a similar function and maintain a stable $1.00 net asset value, which many investors find psychologically reassuring. These are genuinely excellent tools for cash management, though holding individual T-bills directly through TreasuryDirect maximizes your yield by eliminating all intermediary fees entirely.

The Tax Advantage You’re Probably Not Aware Of

Here’s something that doesn’t get enough attention: interest income from U.S. Treasury securities is exempt from state and local income taxes. It’s fully taxable at the federal level, but if you live in a high-tax state like California, New York, or New Jersey, this exemption is meaningful.

Consider a knowledge worker in New York City facing a combined state and local tax rate of around 12-13%. A high-yield savings account paying 5% is subject to that full tax bite at both the federal and state level. A T-bill paying the same 5% is only taxed federally. On an after-tax basis, the T-bill can be meaningfully superior to nominally identical yields from CDs or savings accounts, particularly for workers in high-tax jurisdictions (Poterba, 1989).

If you’re in a lower-tax state, this advantage shrinks, but it doesn’t disappear entirely. Running the actual after-tax math on your specific situation is worth ten minutes of your time, especially if you’re deciding between a T-bill and a bank CD offering similar headline yields.

Where T-Bills Fit in a Modern Portfolio

Let me be direct: T-bills are not a replacement for equity investments. Over long time horizons, a diversified stock portfolio will almost certainly outperform T-bills by a substantial margin. The historical equity risk premium — the extra return stocks provide over risk-free assets — exists precisely because you bear meaningful volatility and occasional catastrophic drawdowns in exchange for higher expected returns (Damodaran, 2022).

T-bills belong in specific roles within a portfolio:

• Emergency funds: The 3-6 months of expenses most financial planners recommend keeping liquid. Previously this sat in a savings account earning nothing; now it can earn 5% in rolling 4-week or 13-week T-bills with near-instant liquidity through secondary markets or ETF structures.
• Short-term savings goals: A house down payment you need in 12-18 months, a planned sabbatical fund, or tuition reserves. These dollars shouldn’t be in stocks due to sequence-of-returns risk, and they don’t belong in a standard savings account when 5% alternatives exist.
• Tactical cash allocation: Some investors maintain a cash allocation as dry powder for opportunistic investing. That cash waiting for deployment should be earning maximum yield, not sitting idle.
• Stable counterweight: For workers who feel their human capital is highly correlated with equity markets — tech employees with significant stock compensation, for instance — a larger allocation to truly uncorrelated, safe assets like T-bills can reduce overall portfolio risk in a meaningful way.

The critical mindset shift is recognizing that “safe” and “earning nothing” are no longer synonymous. For most of the past 15 years, that equation was roughly true. Today it isn’t, and portfolio construction should reflect that change.

Common Objections, Addressed Honestly

“My high-yield savings account already pays 4.5%.”

Possibly, and that’s genuinely good. High-yield savings accounts from online banks have become more competitive. But bank rates are variable and at the bank’s discretion — they can lower them without notice. T-bill yields are locked in at purchase for the full maturity. Additionally, after accounting for state tax exemption, the after-tax comparison often favors T-bills even when the headline yields appear similar.

“What if I need the money before it matures?”

If you buy through TreasuryDirect, early redemption is restricted for the first 45 days after purchase. After that, you can sell at face value through the Treasury’s secondary market mechanism, though the process takes a few days. If immediate liquidity is critical, buying T-bills through a brokerage account or using a T-bill ETF solves this problem entirely — secondary market liquidity for Treasury securities is essentially unlimited.

“This seems complicated for small amounts.”

The $100 minimum means T-bills are accessible at virtually any savings level. And once you’ve set up a TreasuryDirect account or added fixed income to your brokerage account, the ongoing management is minimal — especially with auto-roll enabled. I have ADHD. I do not do things that require constant monitoring. T-bills, properly set up with auto-roll, require almost none.

“Interest rates might fall soon, making this less attractive.”

True, and worth acknowledging. If the Fed cuts rates substantially over the next 12-24 months, T-bill yields will decline accordingly. But this is an argument for acting now while yields are elevated, not an argument against T-bills as a category. When rates eventually fall to levels where T-bills yield 2-3%, the calculus changes and other options become more attractive by comparison. Financial decisions are always made relative to available alternatives at a specific moment in time.

Getting Started This Week

The practical barrier to owning T-bills is lower than almost any other investment vehicle. You need a Social Security number, a U.S. bank account, and about 20 minutes. Go to TreasuryDirect.gov, open an account, link your checking account, and place a non-competitive bid for the next 13-week T-bill auction. Auctions happen every Monday, with settlement on Thursday. You’ll see the exact yield when the auction closes, and your money will be working at that rate within days.

If you prefer to stay within a platform you already use, log into your Fidelity, Schwab, or Vanguard account, navigate to the fixed income or bond section, and search for Treasury bills. The interface walks you through the purchase in a few clicks, and you’ll see current yields displayed clearly before you commit.

The knowledge workers who build meaningful wealth over time aren’t necessarily the ones taking the biggest risks — they’re the ones consistently capturing available returns at every level of their portfolio without leaving money on the table unnecessarily. Right now, T-bills are one of the most straightforward opportunities to do exactly that, and understanding them is worth more than another hour scrolling financial news looking for the next hot stock tip.

Last updated: 2026-03-31

References

• Adrian, T., Fleming, M., & Nikolaou, K. (2025). U.S. Treasury Market Functioning from the GFC to the Pandemic. Federal Reserve Bank of New York Staff Reports. Link
• Stein, J. C., & Wallen, J. (2025). The Imperfect Intermediation of Money-Like Assets. The Journal of Finance. Link
• Somogyi, F. (2025). What Treasury Auctions Reveal About Investor Demand. Harvard Business School Working Paper. Link
• Yadav, Y. (2025). Stablecoins and the US Treasury market. Journal of International Economic Law. Link
• Liang, N. (2023). What’s going on in the US Treasury market, and why does it matter?. Brookings Institution. Link
• Federal Reserve Board (2026). Why have far-forward nominal Treasury rates increased so much in the past few years?. FEDS Notes. Link

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