CD vs. Treasury Bills: Is Locking Into a CD Still Worth It When T-Bill Rates Are This High?

The Big Question: Why Bother With a CD Right Now?

If you have cash sitting on the sidelines — an emergency fund, a down-payment stash, or money you just don’t want to risk in stocks — you’re probably wondering whether to lock it into a CD or buy Treasury bills instead. It’s a fair question, and the answer comes down to a few factors that are pretty easy to weigh once you see them side by side.

Here’s how both options work, what the numbers look like right now, and which one might be the better fit for you.

What Is a CD, and How Does It Work?

A certificate of deposit (CD) is a type of savings account that holds your money for a fixed period and pays you interest in return (source). Terms typically run from a few months to several years. When you open a CD, the bank locks in your rate upfront and guarantees it for the entire term (source). Generally, longer terms come with higher rates.

The catch: pull your money out early and you’ll almost certainly pay a penalty (source). That’s the price of the higher, guaranteed rate.

CDs at FDIC-insured banks are protected up to $250,000 per depositor, per bank (source) — a meaningful safety net for most savers.

What Is a Treasury Bill, and How Does It Work?

A Treasury bill (T-bill) is essentially a short-term loan you make to the U.S. government (source). Rather than paying interest the traditional way, T-bills are sold at a discount — you pay slightly less than face value and receive the full face value at maturity (source). That difference is your return.

T-bills are backed by the full faith and credit of the U.S. government and are considered virtually risk-free (source). They come in short terms — 4, 8, 13, 26, or 52 weeks (source) — and yields are set by current market demand and interest rates.

One underrated perk: T-bill interest is exempt from state and local taxes, though you still owe federal income tax on it (source). Depending on where you live, that exemption can make a real difference in your after-tax return.

What Do the Rates Actually Look Like Right Now?

Let’s look at the current numbers using official data.

Short-Term T-Bill Rates

The 3-month Treasury bill rate is currently 3.80% (source), and the 1-year Treasury constant maturity rate sits at 3.85% (source). The weighted-average yield on all outstanding U.S. Treasury bills is 3.69% (source).

Those are competitive numbers for essentially zero credit risk.

What About Longer Maturities?

If you’re willing to go further out, the 10-year Treasury sits at 4.56% (source). That’s a note or bond rather than a T-bill, but it shows the yield curve does reward patience at the longer end.

How Do CDs Compare?

The best nationally available CD rates at online banks and credit unions are often competitive with — or slightly above — comparable T-bill yields, especially for longer terms. But the rate alone doesn’t tell the whole story. Taxes, flexibility, and your timeline all factor in.

The Key Differences That Actually Matter

Here are the factors that should drive your decision.

1. Tax Treatment

This is the one most people overlook. T-bill interest is exempt from state and local taxes (source). If you live in a state with a meaningful income tax, a T-bill yielding 3.80% (source) could actually beat a CD with a nominally higher rate once you account for state taxes on the CD’s interest.

Say your state has a 5% income tax rate. A T-bill at 3.80% carries a taxable-equivalent yield that’s higher than its face rate when stacked against a fully state-taxable CD. Run the math for your own state before assuming the CD with the bigger headline number wins.

2. Flexibility and Liquidity

T-bills can be sold before maturity, though the price will reflect current market conditions (source). CDs typically hit you with a penalty for early withdrawal (source), and that penalty can sting depending on the bank and term.

If there’s any real chance you’ll need the money before the term ends, T-bills give you more of an exit — though selling on the secondary market isn’t always seamless.

3. Safety and Insurance

Both options are extremely safe, just in slightly different ways. CDs at FDIC-insured banks are protected up to $250,000 per depositor, per bank (source). T-bills are backed directly by the U.S. government — no insurance cap applies because the government itself is the issuer, not a private institution (source).

For most savers, both are “sleep at night” money. But if you have more than $250,000 to park in one place, T-bills sidestep the FDIC limit entirely.

4. Rate Lock-In: A Double-Edged Sword

When rates are falling, locking into a longer CD is a smart play — you hold onto a higher rate even as new offerings drop (source). When rates are rising or uncertain, T-bills are more flexible because their short terms let you reinvest at higher rates sooner (source).

With the 3-month T-bill at 3.80% (source) and the 1-year at 3.85% (source), the yield curve is relatively flat at the short end. You’re not giving up much by staying short and keeping your options open.

When a CD Might Still Win

T-bills have a strong case right now, but CDs aren’t obsolete. Here’s when one might make more sense for you:

You need a specific dollar amount on a specific future date. If you’re saving for a home down payment in exactly 18 months, a CD with a matching term gives you a guaranteed balance on a guaranteed date — no market fluctuation, nothing to monitor.

You’re in a zero- or low-income-tax state. If your state doesn’t tax income, or taxes it at a very low rate, the T-bill exemption matters less. A CD with a higher headline rate might genuinely come out ahead.

You want simplicity and already bank somewhere. Opening a CD at your existing bank takes minutes. Buying T-bills means setting up a separate account — a small but real friction cost.

You find a CD rate that clearly beats comparable T-bill yields after taxes. Some online banks and credit unions occasionally run promotional CD rates that outpace T-bills even on an after-tax basis. Always compare before you commit.

When T-Bills Might Win

Here’s when T-bills have the edge:

You live in a high-tax state. The state-tax exemption on T-bill interest (source) can tip the scales meaningfully in your favor.

You want maximum flexibility. T-bills mature in as little as 4 weeks (source) and can be sold on the secondary market if you need out early. That’s hard to beat for parking money you might need on short notice.

You have more than $250,000 to save. T-bills carry no FDIC insurance cap because the U.S. government is the borrower (source). CDs are only insured up to $250,000 per depositor, per bank (source).

You want to keep reinvesting at market rates. With the 3-month T-bill at 3.80% (source) and the 1-year at 3.85% (source), you can roll over short-term T-bills frequently and capture whatever the market offers at each new auction.

How to Buy T-Bills

You can purchase T-bills directly through TreasuryDirect.gov, the U.S. government’s official platform for Treasury securities. You can start with as little as $100 (source), which puts them within reach of nearly any saver.

If you’d rather keep everything in one place, many brokerage and investment platforms also offer access to Treasury securities at auction or on the secondary market.

A Simple Decision Framework

Still on the fence? Work through these questions:

Do you live in a state with a significant income tax? If yes, lean toward T-bills — the state-tax exemption adds real value.
Do you need the money before the term ends? If there’s any real chance of that, T-bills or a short-term CD are safer than a long-term CD.
Do you have more than $250,000 to park in one institution? If yes, T-bills sidestep the FDIC limit.
Is a specific CD rate clearly higher than the equivalent T-bill rate on an after-tax basis? If yes, the CD might win — do the math.
Do you value simplicity over optimization? If yes, a CD at your existing bank might be the right call even if T-bills have a slight edge.

For most everyday savers right now, the combination of competitive rates, state-tax exemption, and flexibility makes T-bills a compelling option. That said, “compelling” doesn’t mean “always better” — your personal tax situation and timeline are the deciding factors.

The Bottom Line

With the 3-month T-bill at 3.80% (source) and the 1-year at 3.85% (source), T-bills are genuinely competitive with most CDs right now — and the state-tax exemption gives them an extra edge for savers in high-tax states. That said, CDs still make sense if you want a locked-in rate for a specific future goal, if you’re in a low-tax state, or if you find a promotional CD rate that beats T-bills after taxes.

The smartest move is to do a quick after-tax comparison for your specific state before committing. A few minutes of math could mean meaningfully more money in your pocket by the time your savings mature.

This article was researched using official U.S. data sources cited inline and reviewed for accuracy before publishing. It is general information, not personalized financial advice. For decisions specific to your situation, consult a licensed professional.

Data refreshed: 2026-06-11. Editorial accuracy verified for cited sources only.