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Treasury Bills vs CDs: Maturity, Yield, Taxes and Insurance

Treasury bills are short-term U.S. government securities generally bought below face value and paid at face value at maturity; bank CDs are time deposits that promise stated interest under an account agreement. Bills carry U.S.

Timeline

  1. 2026-10-13: Current TreasuryDirect, FDIC, SEC and IRS guidance on Treasury bills, CDs, liquidity, insurance and tax treatment was reviewed for this guide.
  2. 2026-10-13: The current authoritative sources cited in this guide were reviewed.

A Treasury bill and a certificate of deposit can both hold money for a known period, but the legal claims differ. A T-bill is a marketable obligation of the U.S. Treasury, issued in maturities from four through 52 weeks. It is generally sold below face value and pays face value at maturity; the difference is interest. A CD is a time deposit at a bank or credit union that pays interest under its account agreement and returns the deposit at maturity. Match the maturity date to the cash need before comparing any quoted rate. [1][2]

Headline yields are not automatically comparable. Treasury bill quotations may show a bank discount rate based on face value and a 360-day year, while TreasuryDirect’s investment rate uses purchase price and a 365- or 366-day year without compounding. A bank CD usually advertises annual percentage yield, which reflects compounding under stated assumptions. For a fair comparison, calculate the dollars received at the same maturity from the dollars actually invested, include fees, and annualize with one method. Do not place a bill’s discount rate beside a CD’s APY and treat the larger number as the better return. [3][4]

Credit protection also uses different systems. Treasury securities are backed by the full faith and credit of the U.S. government; they are not FDIC deposits. CDs issued by an FDIC-insured bank are covered, including accrued interest, only within applicable deposit-insurance limits and ownership categories. The standard maximum is currently $250,000 per depositor, per insured bank, per ownership category. Branches of the same bank do not create separate limits. Federally insured credit-union share certificates use NCUA coverage rather than FDIC coverage, so verify the institution and aggregate every same-category deposit before buying. [2][5][6]

Holding to maturity makes the cash flow most predictable. A T-bill bought at auction or in the market pays face value at maturity, assuming the U.S. government honors the obligation. A conventional fixed-rate CD pays according to its agreement, but the depositor must check interest crediting, maturity date, grace period and automatic-renewal rate. Callable CDs give the issuing bank a right to redeem early, often when replacing the deposit is less attractive for the saver. Neither product locks the next rate: rolling a maturing instrument creates reinvestment risk if market yields have fallen. [1][2][7]

Access before maturity differs by channel. A direct bank CD commonly allows early withdrawal only after a stated penalty, though some CDs restrict withdrawal more severely. A brokered CD is usually sold in a secondary market rather than redeemed from the bank; its price can fall below principal when rates rise, buyers may be scarce, and sales fees can reduce proceeds. T-bills are marketable and can be sold through a bank, broker or dealer, but market price can also produce a gain or loss. TreasuryDirect holdings must be transferred to that commercial system, and TreasuryDirect imposes a 45-day holding period before transfer or sale. [2][7][8]

Taxes can reverse a small quoted-rate advantage. Interest on both products is generally subject to federal income tax. Treasury interest is exempt from state and local income taxes, while CD interest is generally taxed under the saver’s state rules. IRS guidance treats the discount earned on a T-bill redeemed at maturity as interest. Compare after-tax dollars using the applicable marginal rates and account type, and preserve Forms 1099-INT or 1099-OID and purchase records. Tax treatment of a sale before maturity can be more complex than simply holding the bill to redemption. [1][9][10]

Purchase mechanics affect convenience and risk. Individuals can submit noncompetitive T-bill bids through TreasuryDirect or a bank or broker, accepting the auction result; brokers may also sell outstanding bills. A bank CD is opened directly under its deposit agreement, while a brokered CD is held through a securities account and may carry a brokerage fee or call feature. For brokered deposits, confirm the actual issuing bank, account titling and pass-through insurance conditions rather than assuming the broker’s name supplies coverage. Also check settlement dates so idle cash does not erase a yield advantage. [1][2][7][11]

Choose with a written maturity map. List the cash date, purchase amount, promised maturity proceeds, comparable annualized yield, federal and state tax, early-exit method, fees, insurance aggregation and reinvestment instruction. A T-bill can suit a short dated need and taxpayers who benefit from the state-local exemption; a properly insured direct CD may offer a simpler quoted APY and known early-withdrawal terms. A brokered CD needs separate price and call analysis. Split maturities rather than forcing every dollar into one date, and disable automatic renewal or reinvestment when the next use of cash is already known. [1][2][7][8]

Sources

  1. TreasuryDirect — Treasury Bills
  2. Federal Deposit Insurance Corporation — Shopping for a Certificate of Deposit
  3. TreasuryDirect — Understanding Pricing and Interest Rates
  4. TreasuryDirect — Investing Directly with the U.S. Treasury
  5. Federal Deposit Insurance Corporation — Your Insured Deposits
  6. National Credit Union Administration — Share Insurance Coverage
  7. SEC Investor.gov — Brokered CDs: Investor Bulletin
  8. TreasuryDirect — Selling a Treasury Marketable Security
  9. Internal Revenue Service — Topic No. 403, Interest Received
  10. Internal Revenue Service — Publication 1212, Guide to Original Issue Discount Instruments
  11. TreasuryDirect — Buying a Treasury Marketable Security

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