Treasury Bills vs CDs: After-Tax Comparison for Short-Term Savings (2026)
If you have cash you will not need for a few months to a year — a house down payment fund, a tuition payment, a tax bill due next spring — the two safest parking spots are Treasury bills and certificates of deposit. Right now their headline yields sit close together: the 52-week Treasury bill sold at a 4.496% investment rate on October 27, 2026, while the best advertised 1-year CDs paid up to 4.75% APY in October. The deciding factor is not the headline number. It is taxes: Treasury bill interest escapes state and local income tax, CD interest does not. In a high-tax state the bill usually wins after tax even when the CD advertises more; in a state with no income tax, the CD usually wins. That one rule settles most comparisons — the rest is about flexibility and where your money already sits. What you are actually buying A Treasury bill is a short-term loan to the U.S. government. You buy the bill below its face value and receive the full face value when it matures. Terms run 4, 8,...