Short-term U.S. government debt (4–52 weeks), sold at a discount. State-tax-free and backed by the full faith of the Treasury. Tbillery tracks its current reference yield and compares it with the other safe places to park cash.
Compare with: Series I Savings Bond · Treasury Note · Treasury Inflation-Protected Security · Certificate of Deposit · Money Market / High-Yield Savings.
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Updated July 2026