What Is a CD, and Is It Worth It?
How certificates of deposit work, what APY and terms mean, the early-withdrawal penalty, CD ladders, and when a CD beats a high-yield savings account.
The short version
- A CD pays a fixed, guaranteed APY if you leave the money untouched for a set term.
- The catch is liquidity: pulling out early triggers an early-withdrawal penalty.
- CDs suit money with a known timeline; a high-yield savings account is better for flexible cash.
- A CD ladder splits money across terms so some frees up regularly while you still lock in longer rates.
A certificate of deposit — a CD — is one of the safest ways to earn interest on cash. You agree to leave a lump sum with a bank for a fixed term, and in return the bank guarantees a fixed rate for the whole period. No market risk, FDIC insured. The trade-off is that your money is locked up. Here’s how to tell whether that trade is worth it for you.
How a CD works
You choose a term — commonly 3 months to 5 years — and deposit your money. The bank pays a fixed APY (annual percentage yield, which already accounts for compounding) until the CD matures. At maturity you get your deposit back plus the interest earned. Because the rate is locked, a CD is completely predictable: you know on day one exactly what you’ll have at the end.
The catch: early-withdrawal penalties
Your money is locked until maturity
Take money out of a CD before the term ends and you’ll pay an early-withdrawal penalty — often several months’ interest, sometimes more than you’ve earned. Only put money in a CD that you’re confident you won’t need until it matures.
CD vs. high-yield savings account
Right now the rates are similar — top CDs and top high-yield savings accounts both pay around 4%. So the choice comes down to liquidity versus certainty:
- Choose a CD for money with a known deadline — a down payment in 18 months, a tax bill next year — where you want a rate locked in and won’t touch it.
- Choose a high-yield savings account for flexible cash and your emergency fund, where you may need to withdraw anytime and want the rate to float.
One warning: shop around. The best CDs pay over 4%, but the FDIC national average 1-year CD is only about 1.65% — the gap between a top online bank and your local branch is enormous.
The CD ladder
If you like CD rates but hate locking everything away, build a ladder: split your money across several CDs with staggered terms — say 1, 2, 3, 4, and 5 years. One matures every year, giving you regular access to a chunk of cash, while the rest keeps earning the higher long-term rates. As each rung matures, you reinvest it at the top of the ladder.
See what a CD earns
Enter a deposit, APY, and term to see your exact maturity value and interest earned.
Saving toward a specific goal instead? Work out the monthly amount that gets you there.
Sources
This article is for general education and is not financial, tax, or legal advice. Figures reflect published 2026 IRS and SSA amounts as of the date above; verify current limits with the linked sources or a qualified professional before acting.
About the author
David Miles is the founder of FigureMoney and builds independent, source-backed personal-finance tools across the Modern Site Builders network. Every calculator and guide cites the IRS, SSA, or primary research behind its numbers.
Calculators in this guide
CD Calculator
Calculate what a certificate of deposit (CD) is worth at maturity. Enter your deposit, APY, and term to see total interest earned and the final balance.
Savings Goal Calculator
Find out how much to save each month to reach a goal by your target date, given a starting balance and interest rate. Includes a year-by-year projection.
Emergency Fund Calculator
Find your emergency fund target and how long to reach it. Enter your monthly essential expenses, months of coverage, and current savings.
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