High-Yield Savings Account vs CD vs Treasury Bills in 2026

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In 2026, a high-yield savings account (HYSA, ~4.5–5%) is best for your emergency fund because it stays liquid, a CD (~5% for 6 months) suits money you will not touch for a fixed period, and Treasury bills (~5.2%) win for medium-term cash thanks to state-tax exemption. Here is the side-by-side.

The Three Options

High-Yield Savings Account (HYSA)

Online-bank savings paying roughly 4.5–5% in early 2026. Fully liquid — withdraw anytime — and FDIC insured. The rate is variable and can drop if the Fed cuts.

Certificate of Deposit (CD)

Lock money for a set term (3, 6, 12 months) at a fixed rate, around 5% for a 6-month CD. FDIC insured. Early withdrawal triggers a penalty (often several months of interest).

Treasury Bills (T-Bills)

Short-term US government debt, yielding ~5.2% for 3–6 month bills. Backed by the US government and exempt from state and local income tax — a real edge in high-tax states. Sold via TreasuryDirect or a brokerage; you can sell on the secondary market before maturity.

Comparison Table

Which for an Emergency Fund?

HYSA. An emergency fund must be instantly accessible. A CD penalty or T-bill settlement delay defeats the purpose. Accept the slightly lower rate for true liquidity.

Which for Medium-Term Savings?

Money earmarked for a goal 6–18 months out: T-bills or a CD ladder. T-bills usually edge out CDs on after-tax yield if you are in a high-tax state, because of the state-tax exemption. A CD locks the rate, which is attractive if you expect rates to fall.

A Simple Strategy

• Emergency fund (3–6 months expenses): HYSA
• Cash needed in 6–12 months: T-bills or short CD
• Cash you might need sooner but want yield on: HYSA

To model after-tax yields and CD ladders precisely, a Texas Instruments BA II Plus financial calculator ($35.99) handles the time-value math fast. For the broader strategy of where cash fits in a portfolio, The Bogleheads' Guide to Investing ($14.39) is the clearest reference.

FAQ

Are these safe? HYSAs and CDs are FDIC insured to $250k. T-bills are backed by the US government — effectively the safest of the three.

Why are T-bills tax-advantaged? Treasury interest is exempt from state and local income tax. In a high-tax state this can make a ~5.2% T-bill beat a ~5% taxable CD on an after-tax basis.

What if rates fall in 2026? HYSA rates drop with the Fed. CDs and T-bills lock your rate at purchase, which is the case for laddering when cuts are expected.