CDs and Treasury bills are two of the most popular low-risk alternatives to a savings account. The key difference: T-bill interest is exempt from state income tax, which matters most when Treasury yields are close to CD rates, because the exemption can tip the after-tax result.
CDs vs Treasury Bills: Quick Comparison
| Feature | CD | Treasury Bill/Note |
|---|---|---|
| Yield | Varies by bank and term (best CD rates) | Varies by term (Fed H.15 or TreasuryDirect.gov) |
| State income tax | Taxable | Exempt |
| Federal income tax | Taxable | Taxable |
| FDIC / government backed | FDIC ($250K limit) | US gov’t (no dollar limit) |
| Liquidity | At maturity (or penalty, varies by bank) | Sell on secondary market |
| Minimum purchase | $0–$10,000 (varies) | $100 |
| Term options | 3 months to 5+ years | 4, 8, 13, 17, 26, 52 weeks (bills); 1–10 years (notes) |
| Where to buy | Directly from banks | TreasuryDirect or brokerages |
| Auto-renewal | Often auto-renews | Matures and pays out (or auto-rollover if set up) |
Rate Comparison: CDs vs Treasuries
Compare the live numbers for the same term. The Federal Reserve publishes Treasury yields daily in its H.15 release, TreasuryDirect.gov shows auction results, and our best CD rates page lists the CD rates we read on bank pages with their dates. A CD with a higher gross rate than the Treasury for the same term can still lose after tax in a state with an income tax.
The State Tax Math: When Treasuries Win
Treasury interest is exempt from state income tax. To find the equivalent CD rate, use this formula:
$$\text{CD Equivalent Rate} = \frac{\text{Treasury yield}}{1 - \text{state tax rate}}$$
Example: A Hypothetical 4.50% Treasury Yield
| State (illustrative bracket) | State Tax Rate | Equivalent CD Rate | Treasury Wins If CD Rate Is Below |
|---|---|---|---|
| Texas / Florida (no state tax) | 0.00% | 4.50% | 4.50% |
| Colorado | 4.40% | 4.71% | 4.71% |
| Georgia (flat rate, 2026) | 4.99% | 4.74% | 4.74% |
| Virginia | 5.75% | 4.77% | 4.77% |
| Minnesota (top bracket) | 9.85% | 4.99% | 4.99% |
| Oregon (top bracket) | 9.90% | 4.99% | 4.99% |
| New Jersey (top bracket) | 10.75% | 5.04% | 5.04% |
| New York (top bracket) | 10.90% | 5.05% | 5.05% |
| California (top bracket) | 13.30% | 5.19% | 5.19% |
State tax rates above are illustrative top- or mid-bracket figures for each state and were not all independently re-verified except where noted elsewhere in this guide (Georgia’s 4.99% flat rate for 2026 was verified via Georgia Department of Revenue coverage in September 2026). Confirm your exact bracket with your state’s tax department, and recompute using the live Treasury yield, which changes daily.
In California, a 4.50% Treasury is equivalent to roughly a 5.19% CD for a resident in the top 13.3% bracket, so a CD would need to pay that much to match the Treasury after tax.
After-Tax Returns: $50,000 Investment (Hypothetical 4.50% on Both)
Assuming a CD and a Treasury both yield 4.50% (hypothetical; verify live rates):
In a State with an Illustrative 5% State Income Tax
| Investment | Pre-Tax Rate | 1-Year Interest | Federal Tax (22%) | State Tax (5%) | After-Tax |
|---|---|---|---|---|---|
| Best CD | 4.50% | $2,250 | $495 | $112 | $1,642 |
| Treasury | 4.50% | $2,250 | $495 | $0 | $1,755 |
Treasury wins by $112, which is the state tax on the CD interest.
In California (illustrative top 13.3% state tax bracket)
| Investment | Pre-Tax Rate | 1-Year Interest | Federal Tax (22%) | State Tax (13.3%) | After-Tax |
|---|---|---|---|---|---|
| Best CD | 4.50% | $2,250 | $495 | $299 | $1,456 |
| Treasury | 4.50% | $2,250 | $495 | $0 | $1,755 |
Treasury wins by $299 in this example.
In Texas (No State Tax)
| Investment | Pre-Tax Rate | 1-Year Interest | Federal Tax (22%) | State Tax (none) | After-Tax |
|---|---|---|---|---|---|
| Best CD | 4.50% | $2,250 | $495 | $0 | $1,755 |
| Treasury | 4.50% | $2,250 | $495 | $0 | $1,755 |
With equal yields and no state tax, the two tie. In a no-income-tax state, the choice comes down to the actual rates on offer, so recompute with the live CD and Treasury yields.
FDIC Insurance vs Government Backing
| Coverage Type | CD | Treasury Bill/Note |
|---|---|---|
| Coverage source | FDIC insurance | US Treasury / full faith and credit of the US government |
| Maximum coverage | $250,000 per bank | No dollar limit |
| Risk level | Extremely low, within FDIC limits | Considered among the lowest-risk instruments globally |
| Over $250,000 | Spread across banks | No limit |
For balances over $250,000: Treasuries eliminate the FDIC limit concern entirely. You can invest $1 million in Treasuries with the same government backing as $10,000.
Liquidity Comparison
| Situation | CD | Treasury Bill/Note |
|---|---|---|
| Need money before maturity | Pay an early withdrawal penalty (formula varies significantly by bank) | Sell on secondary market at market price |
| Market value if sold early | N/A (not traded) | May gain or lose depending on rate movements |
| If interest rates rise after purchase | Stuck at lower rate (penalty to exit) | Sell at a discount, reinvest at higher rate |
| If interest rates fall after purchase | Locked-in rate is now higher than market | Sell at a premium |
CD advantage: No market value risk — you always know exactly what you’ll get at maturity. Treasury advantage: Can exit on the secondary market without a bank penalty, though at a market-determined price.
How to Buy Treasury Bills and Notes
| Method | Ease | Cost | Best For |
|---|---|---|---|
| TreasuryDirect.gov | Moderate | Free | Direct purchase, auto-rollover |
| Fidelity | Easy | Free | Brokerage integration, easy comparison |
| Vanguard | Easy | Free | Investors with Vanguard accounts |
| Charles Schwab | Easy | Free | Schwab customers |
TreasuryDirect.gov: Best for direct purchases with auto-rollover options. Set up a Treasury ladder just like a CD ladder.
Via brokerage: Buy, sell, and manage Treasuries alongside your investment portfolio. Easier for most people who already have a brokerage account.
CD Ladder vs T-Bill Ladder
Both strategies can be laddered to create regular cash flow:
| Feature | CD Ladder | T-Bill/Note Ladder |
|---|---|---|
| Regular cash flow | Yes (as each CD matures) | Yes (as each Treasury matures) |
| Rate lock | For the full term | For each Treasury’s term |
| Available terms | 3 months to 5+ years | 4 weeks to 52 weeks (bills); up to 10 years (notes) |
| Reinvestment | Often auto-renews (watch for this) | Must reinvest manually or via TreasuryDirect auto-rollover |
Typical T-bill ladder: 4-week, 8-week, 13-week, 26-week, 52-week bills. One matures every few weeks.
Which Should You Choose?
Choose a CD if:
- A specific CD offer meaningfully beats the comparable live Treasury yield, even after tax
- You want simplicity — one bank, automatic maturity handling
- You’re staying comfortably under the $250,000 FDIC limit
Choose Treasuries if:
- You’re in a state with meaningful income tax (CA, NY, NJ, OR, MN, HI, and others)
- You have over $250,000 to invest (avoids the FDIC limit)
- You want secondary-market liquidity
- You’re comfortable using TreasuryDirect or a brokerage
- The Treasury yield for your term is close to or above the CD rate you are offered — check the live numbers
Choose Both (Diversify) if:
- You have a larger balance to deploy across multiple instruments
- You want to hedge against bank-specific and issuer-specific considerations
See the full CD guide for best rates, laddering strategy, and HYSA comparisons.
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