Treasury Bills vs CDs: How They Compare

Treasury bills and certificates of deposit both offer a fixed return over a set period in exchange for parking cash, which is why they get compared so often. But they come from different issuers, are accessed differently before maturity, are insured under different systems, and are taxed differently. Those four differences are the whole comparison, and none of them is about which one is simply better.

Who issues them

A Treasury bill is issued by the US federal government and backed by its full faith and credit. A certificate of deposit is issued by a bank or credit union and, when the institution is insured, backed by FDIC insurance at a bank or NCUA insurance at a credit union, up to the applicable limits. Both are generally considered very low risk, but the backing comes from two different places, and the insurance limits matter for CDs in a way they do not for a Treasury.

Getting your money out early

This is where they diverge most. A CD held to maturity pays as agreed, but taking the money out early usually triggers an early-withdrawal penalty set by the bank, often a number of months of interest. A T-bill has no early-withdrawal penalty; instead, if you hold it in a brokerage account, you sell it on the secondary market at whatever price the market offers that day, which can be above or below what you paid. So a CD's early cost is a known penalty, while a T-bill's early cost is market price risk. Held to maturity, both deliver their fixed outcome.

The tax difference that can flip the ranking

CD interest is taxed as ordinary income at both the federal level and, in most states, the state level. Treasury bill interest is federally taxable but exempt from state and local income tax. For someone in a state with an income tax, that exemption means a T-bill and a CD quoting the same headline rate do not leave you with the same amount. What matters is the rate you keep after tax. The free After-Tax Yield Calculator does that conversion per state so the comparison is honest rather than based on the advertised number.

Where each one fits

Neither instrument wins in the abstract. A CD can make sense when you want a fixed rate and a known penalty structure and you are comfortable with a specific bank term. A T-bill can make sense when the state-tax exemption helps you or you want the ability to sell on a deep market. The deciding factors are when you will need the money and how each is taxed for you, not which sounds more sophisticated. For the related bank-side tradeoff, see CDs versus high-yield savings, and for the Treasury side, what a Treasury bill is. Current cash venues are compared in the best savings rates table, and the weekly lessons run in the Obsidian Metrics community.

Educational only. Not financial advice. Results not guaranteed. We are not financial advisors. Tax treatment depends on your circumstances; consult a qualified tax professional before acting.