CDs vs. Treasury Bills: Which Offers Better Returns in 2026?

First, Drop the “5% Guaranteed” Assumption

The best fixed cash return changes with every auction and bank repricing cycle. In mid-2026, broad 5% offers were not a safe assumption. The Federal Reserve's June target range was 3.50%–3.75%, and the FDIC's March 2026 table showed national average CD rates well below 5%, though individual institutions and special products could differ.

The useful decision is not “Where can I get 5%?” It is:

> For the term I need, does a federally insured CD or a U.S. Treasury bill deliver the better after-tax yield and access?

CD vs. Treasury Bill at a Glance

TreasuryDirect's Treasury bill overview confirms the standard maturities, $100 minimum, auction structure, and exemption from state and local tax.

How a CD Pays

A CD is a time deposit. The bank discloses:

• Interest rate and APY
• Maturity date
• Compounding
• Minimum balance
• Early-withdrawal penalty
• Renewal and grace-period terms

The APY assumes interest remains according to the disclosed terms. At an FDIC-insured bank, CDs count with other deposits in the same ownership category toward the standard $250,000 limit. Federally insured credit-union share certificates use NCUA insurance rules.

CD strengths:

• Familiar quoted APY
• Easy to open at a bank
• Fixed return through maturity
• Predictable maturity value
• Possible no-penalty options

CD weaknesses:

• Early withdrawal can cost months of interest
• Automatic renewal can roll into a poor rate
• Deposit-insurance limits require attention
• Interest is generally subject to federal, state, and local income tax
• The best APY may require a high minimum or nonstandard term

How a Treasury Bill Pays

A T-bill does not pay a coupon every month. It is generally sold at a discount or at par. At maturity, Treasury pays face value; the difference is the interest.

Example:

• Face value at maturity: $10,000
• Purchase price: $9,905
• Interest at maturity: $95

The auction's investment rate annualizes the return. Do not compare a simple discount rate directly with a CD APY without understanding the conventions. Brokerage screens often display an annualized yield that is easier to compare.

T-bill strengths:

• Direct U.S. government backing
• No state or local tax on interest
• Frequent maturities
• $100 minimum
• Can be purchased through TreasuryDirect or brokers
• Often liquid in the secondary market when held through a broker

T-bill weaknesses:

• Auction pricing is less intuitive
• TreasuryDirect securities cannot be sold there with one click; transfer procedures may be needed
• Selling before maturity at a broker can produce a gain or loss
• Interest arrives at maturity rather than as a monthly bank credit
• Reinvestment rates are unknown

The State-Tax Advantage

Treasury bill interest is subject to federal income tax but exempt from state and local income tax. CD interest is generally taxable at all three levels where applicable.

That can make a lower quoted Treasury yield better after tax.

After-Tax Yield Approximation

For a CD:

After-tax yield ≈ CD yield × (1 − federal rate − state rate)

For a Treasury bill:

After-tax yield ≈ T-bill yield × (1 − federal rate)

This simplified formula ignores deductions, local taxes, surtaxes, and interactions.

Example: California or New York Saver

Assume:

• CD APY: 4.00%
• T-bill annualized yield: 3.85%
• Federal marginal rate: 24%
• State marginal rate: 9%

Approximate CD after-tax yield:

4.00% × (1 − .24 − .09) = 2.68%

Approximate T-bill after-tax yield:

3.85% × (1 − .24) = 2.93%

The T-bill's quoted yield is 0.15 points lower but its approximate after-tax yield is 0.25 points higher.

On $50,000, that difference is about $125 a year.

Use your actual marginal rates and confirm tax treatment with a tax professional.

Tax-Equivalent Yield

Another method asks: what taxable CD yield would equal the Treasury yield?

Simplified:

Tax-equivalent CD yield = Treasury yield × (1 − federal rate) ÷ (1 − federal rate − state rate)

Using the same 24% federal and 9% state rates:

3.85% × .76 ÷ .67 ≈ 4.37%

In this simplified example, a CD would need to yield about 4.37% to match a 3.85% T-bill after tax.

For someone in a state with no individual income tax, that advantage largely disappears. The higher pre-tax yield may win.

Safety: FDIC Insurance vs. Treasury Backing

Both are commonly treated as very low credit-risk places for cash, but the protection mechanism differs.

• CDs are deposits insured by the FDIC or NCUA within account-ownership limits.
• Treasury bills are obligations of the United States and backed by its full faith and credit; they are not FDIC-insured because they are not bank deposits.

The FDIC insurance guide lists CDs as covered deposits and Treasury securities as outside FDIC coverage.

For CDs above insurance limits, spread deposits across institutions or use ownership categories correctly. Do not assume a brokered-CD marketplace automatically makes every dollar insured without reviewing the issuing banks and coverage.

Liquidity

CD Liquidity

A traditional CD charges an early-withdrawal penalty. Some banks allow partial withdrawal; others require closing the CD. A no-penalty CD offers more flexibility but may pay less.

Read:

• Penalty in days or months of interest
• Whether principal can be reduced
• Whether the bank can refuse early withdrawal except in specific cases
• Grace period after maturity
• Automatic renewal rate

Treasury Liquidity

If a T-bill is held at a brokerage, it can generally be sold in the secondary market before maturity. The price can be above or below what you paid because yields change.

If held in TreasuryDirect, the workflow is less flexible. TreasuryDirect supports holding and reinvestment, but selling requires moving the security to a bank, broker, or dealer subject to its process and holding rules.

For money you may need suddenly, neither a penalty CD nor a TreasuryDirect bill is a substitute for liquid savings.

TreasuryDirect vs. Brokerage

TreasuryDirect

Best for:

• Buying at auction directly
• Holding to maturity
• Automatic reinvestment
• Avoiding brokerage account complexity

TreasuryDirect charges no fee to open or manage the account. Purchases are funded from a linked bank. The interface is functional rather than trading-oriented.

Brokerage

Best for:

• Keeping Treasuries with other investments
• Secondary-market liquidity
• Building ladders in one dashboard
• Using maturity proceeds inside a brokerage

Fidelity, for example, lists $0 online commissions for U.S. Treasury auctions and secondary Treasury transactions. Other brokers have their own pricing.

At auction, a noncompetitive order accepts the rate determined by the auction. In the secondary market, compare yield to maturity, bid-ask spread, and settlement.

Building a 3-, 6-, 9-, and 12-Month Ladder

Treasury bills do not have a regular nine-month term, and banks may not offer every CD term. A practical ladder uses the nearest available maturities.

Suppose you have $40,000:

• $10,000 in a 3-month instrument
• $10,000 in a 6-month instrument
• $10,000 in a 9-month CD or combination of shorter bills
• $10,000 in a 12-month instrument

Every three months, one rung matures. You can:

• Spend it
• Move it to savings
• Reinvest at the long end
• Change from CD to Treasury or vice versa

The ladder reduces reinvestment concentration. If rates fall, only one rung resets at a time. If rates rise, you periodically gain access to new rates.

Use the CD ladder calculator to model equal rungs and estimated interest.

When a CD Wins

Choose a CD when:

• Its after-tax APY beats the comparable T-bill.
• You prefer a familiar bank account.
• The maturity exactly matches a spending date.
• The early-withdrawal penalty is acceptable.
• A no-penalty CD offers valuable flexibility.
• You live in a no-income-tax state and the CD's quoted yield is higher.

When a Treasury Bill Wins

Choose a T-bill when:

• State-tax exemption raises the after-tax return.
• You want direct U.S. government backing.
• A standard Treasury maturity fits.
• You can hold to maturity.
• You want brokerage liquidity.
• You prefer a Treasury ladder.

When a HYSA Wins

Keep the money in high-yield savings when:

• It is part of your emergency fund.
• The spending date is uncertain.
• The yield difference is small.
• A CD penalty or T-bill sale process creates too much friction.
• Immediate transfer access matters more than locking the final 0.20%.

The HYSA vs. CD calculator compares flexible savings with a fixed CD and early-withdrawal penalty.

Common Mistakes

Comparing APY With the Wrong Treasury Yield

Use a comparable annualized investment yield and similar maturity.

Ignoring Tax

The pre-tax winner may lose after state tax.

Ignoring Insurance Aggregation

Multiple CDs at one bank in the same ownership category share an insurance limit.

Buying a Term That Does Not Match the Goal

A higher yield is not worth forced early liquidation.

Letting a CD Auto-Renew Unchecked

Calendar the maturity and grace period.

Treating Treasuries as Price-Stable Before Maturity

The maturity value is known, but the secondary-market price can move.

Frequently Asked Questions

Are brokered CDs the same as bank CDs?

They are deposits issued by banks but purchased through a brokerage. They can carry FDIC insurance within limits at the issuing bank, not at the brokerage itself. Selling before maturity occurs in a secondary market and may produce a loss rather than a simple bank early-withdrawal penalty.

What happens if rates rise after I buy?

Your held-to-maturity return remains based on the original terms, but new instruments may pay more. A Treasury bill's secondary-market price can fall. A bank CD remains subject to its withdrawal rules. Laddering reduces the amount locked at one rate.

What happens if rates fall?

The locked instrument becomes more attractive relative to new offers. At maturity, however, you face reinvestment risk because the new available yield may be lower.

Can I put Treasuries in an IRA?

Brokerage IRAs can generally hold eligible Treasury securities. The state-tax advantage is less relevant inside a tax-advantaged account because current interest taxation is already deferred or potentially avoided under the account's rules. Investment fit and IRA rules matter more.

Are Treasury ETFs the same as holding a T-bill?

No. An ETF owns a rolling portfolio and has a fluctuating share price, expenses, and no single maturity date for your investment. A specific bill held to maturity has a known face value and maturity date.

A $100,000 Worked Comparison

Assume a 12-month CD pays 4.05% and a roughly comparable Treasury yields 3.90%. The investor is in a 24% federal bracket and an 8% state bracket.

• Approximate CD after-tax interest: $4,050 × (1 − .24 − .08) = $2,754
• Approximate Treasury after-tax interest: $3,900 × (1 − .24) = $2,964

The Treasury produces about $210 more after tax in this simplified comparison, despite the lower quoted yield. If the investor lives in a no-income-tax state, the CD's higher pre-tax yield would likely win. If the CD has a valuable no-penalty feature, liquidity could change the decision again.

Decision Worksheet

For each maturity:

1. Record CD APY and penalty.

2. Record T-bill annualized yield.

3. Estimate federal and state marginal rates.

4. Calculate approximate after-tax yields.

5. Confirm the cash-need date.

6. Value liquidity.

7. Verify insurance or Treasury custody.

8. Choose the instrument with the best fit, not merely the highest number.

Bottom Line

CDs win on familiarity and exact bank terms. Treasury bills win on state-tax treatment and direct federal backing. The best answer can change by maturity, state, tax bracket, and account access.

A saver in California or New York may prefer a slightly lower-yielding T-bill after tax. A saver in Texas or Florida may prefer the higher CD APY. Someone with an uncertain expense date may be better in a HYSA than either.

This article is educational and not personalized investment or tax advice. Auction yields, CD APYs, fees, and tax rules change. Verify live terms and consult a tax professional for your circumstances.