Certificate of Deposit

A certificate of deposit (CD) is a time deposit at a bank or credit union: you lock a fixed rate for a fixed term, three months to five years being the common range. The FDIC insures the balance to $250,000 per depositor, per bank, per ownership category. The rate does not move with the Fed once the term starts, which is the entire point. A CD bought at 4.4% pays 4.4% whether the central bank cuts to 3% or hikes to 5%. The trade-off is liquidity, because breaking the term early triggers an early-withdrawal penalty, typically months of interest.

CDs sit between a high-yield savings account, which offers same-day liquidity and a floating rate, and Treasury bills, whose interest is state-tax-free. T-bills can be sold rather than penalized. The CD ladder, staggering maturities across terms, is the standard structure for converting one lump of cash into a schedule of known dates. Interest is taxable as ordinary income, state and federal, in the year it is credited.

The mechanics are contractual. You deposit the principal for a stated term at a stated APY, interest accrues daily and is credited monthly or paid at maturity, and the FDIC insures the balance to $250,000 per depositor, per institution, per ownership category. The rate is fixed for the term, which makes the CD the only common deposit product where rate risk transfers entirely to the bank for its duration. At maturity, most CDs renew automatically into a new term at the current rate unless you act during the grace window, usually 7 to 10 days, which is the only free exit.

The penalty is the second mechanism: breaking early costs months of interest, sized by term, commonly three months on a 12-month CD and six on longer ones. On $50,000 at 4.4%, a six-month penalty is roughly $1,100. The penalty applies to interest first and reaches principal only when the CD is broken very early. The ladder is the third mechanism: splitting $100,000 into five tranches maturing yearly keeps one tranche liquid within 12 months while the rest compound at the longest rate, and laddering beats a single short CD whenever the yield curve slopes upward.

The CD is where savers price certainty, and the pricing is explicit: the rate is fixed, the insurance is federal, and the exit costs months of interest. It matters most for money with a known date, the down payment planned for next spring, the tuition due in two years, the tax bill on a stock sale, where a floating HYSA rate is a nuisance rather than a feature.

I watched a colleague named Brent (yes, that Brent) lock a $50,000 house deposit into a 12-month CD for the rate, then need it four months in. The penalty was roughly $1,100, the interest earned was roughly $730, and the house was bought from checking instead. He calls the CD a good rate at the time; the penalty calls it expensive.

The highest-leverage thing most Americans can do is match the term to the date the money is actually needed, ladder the rest, and read the penalty schedule before signing. Price the trade with the cd calculator or the savings interest calculator.