Treasury Bills vs. CDs: Yield, Safety, Liquidity, and Taxes

A beginner guide comparing Treasury bills and certificates of deposit, with the main tradeoffs around yield, maturity, access, and taxes. This guide explains the moving pieces in plain English so you can read the official source, your broker statement, fund page, tax form, or account document with less guesswork.

Quick answer#

Treasury bills are short-term U.S. government securities, while certificates of deposit are time deposits issued by banks or credit unions. Both can be used for short-term savings goals, but they differ in issuer, marketability, insurance structure, and tax treatment.

What to check first#

Check maturity date, purchase price, quoted yield, early-withdrawal penalties, secondary-market liquidity, deposit-insurance limits, state-tax treatment, and whether the product is bought directly or through a broker.

Common mistake#

The common mistake is comparing an advertised CD annual percentage yield with a Treasury yield without checking maturity, compounding convention, penalties, and whether selling early could produce a gain or loss.

Where to verify the details#

Use TreasuryDirect auction information, bank CD disclosures, brokered-CD details, deposit-insurance limits, and the maturity date for the cash need.

The takeaway#

Treasury bills and CDs can both be conservative tools, but the details decide the fit. Match the maturity to the date the money is needed before reaching for a slightly higher quoted yield.