What a CD is and how you earn money from it
A certificate of deposit is a savings product where you give a bank or credit union a lump sum of money for a fixed period — called the term — in exchange for a may provide interest rate. You cannot withdraw that money before the term ends without paying a penalty. At maturity (when the term is over), the bank returns your original deposit plus all the interest you earned.
The interest rate is locked in on the day you open the CD. If rates rise after you buy, your rate stays the same. If rates fall, you are protected — you keep earning the higher rate you agreed to. This predictability is the main reason people choose CDs over savings accounts, where rates can change at any time.
The bank uses your money during the term, which is why it pays you interest for letting them hold it. The longer the term, the higher the rate usually is, because the bank has your money for longer and can lend it out with more certainty.
Key Takeaways
- You deposit a fixed amount, choose a term length (three months to five years is common), and receive a may provide interest rate for that entire period.
- Your money is locked in — withdrawing early triggers a penalty that reduces your earnings, and the penalty amount varies by bank and term length.
- Interest compounds at intervals set by the bank (daily, monthly, or quarterly), meaning you earn interest on your interest.
- When the term ends, the bank deposits your principal plus all accrued interest into your account, and you can then withdraw it or roll it into a new CD.
- CDs are FDIC-insured up to $250,000 per depositor per bank, making them one of the safest places to store money.
How interest accrues and compounds on a CD
The bank calculates your interest based on the annual percentage yield (APY) it promised you. The APY already includes the effect of compounding, so you do not have to calculate it yourself — the bank does the math and credits your account automatically.
Compounding means the bank adds interest to your balance, and then calculates the next interest payment on that larger balance. If your CD compounds daily, you earn interest on your interest every single day. If it compounds monthly or quarterly, the intervals are longer but the effect is the same: your money grows faster than simple interest would.
For example, a $10,000 CD at 4.5% APY compounded daily will earn slightly more than one compounded monthly, because daily compounding gives you more frequent opportunities to earn interest on your interest. The difference is small for short terms but becomes noticeable over longer periods.
What happens when your CD reaches maturity
On the maturity date, your CD stops earning interest. The bank then moves your principal and all accrued interest into your linked savings or checking account. You can withdraw the money, spend it, or move it elsewhere with no penalty.
Many banks offer an automatic renewal option, which means if you do not withdraw or tell the bank what to do, it will automatically roll your money into a new CD with the same term at the current rate. This can be convenient, but the new rate may be lower than what you earned before. Read your CD agreement to see whether your bank renews automatically, and set a calendar reminder for a few days before maturity so you can decide what to do.
Some banks give you a grace period — usually 7 to 10 days after maturity — during which you can withdraw your money without penalty or move it to a different product. After that window closes, automatic renewal kicks in if you have not acted.
Early withdrawal penalties and when they apply
If you need your money before the maturity date, the bank will let you withdraw it, but you will pay an early withdrawal penalty. This penalty is a set amount of interest the bank subtracts from your earnings. The penalty varies by bank and by term length — a three-month CD might have a penalty of one month's interest, while a five-year CD might have a penalty of six months' interest.
The penalty is calculated based on the interest rate you locked in, not the current rate. So even if rates have fallen, you pay the same penalty. In some cases, if you have not earned enough interest yet, the penalty can eat into your principal, meaning you get back less than you deposited.
Before you open a CD, ask the bank what the early withdrawal penalty is. Some banks publish it in their rate sheet; others require you to ask. Knowing the penalty helps you decide whether a CD is right for you, especially if you think you might need the money sooner than planned.
CD terms and how to choose one
Banks offer CDs with terms ranging from three months to ten years, though the most common are three months, six months, one year, three years, and five years. The longer the term, the higher the rate — this is the trade-off you make for locking your money away longer.
A short-term CD (three to six months) makes sense if you have money you will not need for a few months and want a may provide return with minimal lock-in. A longer-term CD (three to five years) pays more but requires patience and means you cannot access the money without a penalty.
Some people use a CD ladder to balance these trade-offs: they buy multiple CDs with different maturity dates (for example, one that matures in one year, one in two years, one in three years). As each one matures, they can reinvest it or use the money, and they always have some funds becoming available without having to pay an early withdrawal penalty.
FDIC insurance and how your money is protected
CDs held at FDIC-insured banks are covered by FDIC deposit insurance up to $250,000 per depositor per bank. This means if the bank fails, the federal government guarantees you will get your money back, up to that limit. This protection applies whether your CD is still earning interest or has already matured.
If you have more than $250,000 to deposit, you can spread it across multiple banks to keep all of it insured. For example, $300,000 split between two banks ($150,000 at each) is fully covered. Credit unions offer similar protection through the National Credit Union Administration (NCUA), also up to $250,000 per depositor per institution.
Before you open a CD, confirm that the bank or credit union is FDIC- or NCUA-insured. You can check the FDIC's BankFind tool or the NCUA's Credit Union Locator on their websites. If an institution is not insured, your money is at risk if it fails.
How CD rates compare to other savings products
CDs typically pay more than regular savings accounts because you agree to lock your money away. A savings account lets you withdraw anytime with no penalty, so banks pay less interest. A money market account falls somewhere in between — it usually pays more than savings but less than a CD, and it gives you limited check-writing or debit card access.
The rate difference changes with market conditions. When the Federal Reserve is raising rates, new CDs pay more than older ones, so locking in a rate becomes more attractive. When rates are falling, CDs protect you because your rate is may provide — you keep earning the higher rate you locked in.
Treasury bills and bonds are another alternative. A Treasury bill is a short-term government loan (four weeks to one year), and a Treasury bond is longer-term (20 or 30 years). Both are backed by the U.S. government and are very safe, but they work differently than CDs — you buy them at auction, they trade on a secondary market, and their value changes with interest rates. CDs are simpler if you want a set rate and a set maturity date.
Frequently Asked Questions
Can I withdraw money from a CD before it matures?
Yes, but you will pay an early withdrawal penalty. The penalty is a set amount of interest the bank subtracts from your earnings. In some cases, if you have not earned enough interest, the penalty can reduce your principal. The exact penalty depends on your bank and the CD's term length.
What is the difference between APY and interest rate on a CD?
The interest rate is the annual percentage the bank pays you. The APY (annual percentage yield) is the effective rate after compounding is included. APY is always equal to or higher than the stated rate because it accounts for how often interest is added to your balance. Banks must show you the APY so you can compare CDs fairly.
What happens if I do not withdraw my money when the CD matures?
Most banks automatically roll your CD into a new one with the same term at the current rate. This happens during a grace period (usually 7 to 10 days after maturity). If you do not want to renew, withdraw your money during that window. After the grace period ends, you are locked into the new CD.
Are CDs a good place to keep emergency savings?
CDs work best for money you will not need for several months or longer. Because of the early withdrawal penalty, they are not ideal for true emergency funds, which should be in a savings account you can access instantly. CDs are better for money you are saving toward a specific goal with a known timeline.
How much money do I need to open a CD?
Minimum deposits vary by bank and CD type. Some banks have no minimum; others require $500, $1,000, or more. Online banks often have lower minimums than brick-and-mortar banks. Check the bank's website or call to confirm the minimum before you open an account.