What a Certificate of Deposit Is and How You Earn Money From It

A certificate of deposit (CD) is a savings account where you agree to leave your money untouched for a set period—usually three months to five years—in exchange for a fixed interest rate that is higher than what a regular savings account pays. The bank holds your money for that time and uses it to make loans. In return, the bank pays you interest on top of what you deposited.

When your CD reaches its maturity date (the end of the agreed period), the bank returns your original deposit plus all the interest you earned. The interest rate is locked in when you open the CD, so you know exactly how much you will have at the end, regardless of whether interest rates rise or fall in the wider economy.

CDs are offered by banks and credit unions. The interest rate, the length of time you must wait, and the minimum amount you need to deposit all vary by institution. A three-month CD might pay 4.5 percent annual interest, while a five-year CD at the same bank might pay 4.8 percent.

Key Takeaways

  • You deposit a lump sum and agree not to touch it until the maturity date; in return, the bank pays you a fixed interest rate higher than a savings account offers.
  • The interest rate is locked in when you open the CD and does not change, even if market rates move.
  • Withdrawing money before the maturity date triggers an early withdrawal penalty, which is a fee that reduces your earnings or principal.
  • CDs are insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000 per account, so your money is protected even if the institution fails.
  • Longer CD terms usually offer higher interest rates, but your money is locked away for a longer time.

How Interest Accrues and Compounds on a CD

Interest on a CD is calculated based on the annual percentage yield (APY) the bank advertises. If you deposit $10,000 in a one-year CD with a 4.5 percent APY, you will earn $450 in interest over that year, assuming the interest compounds annually (though some CDs compound monthly or daily, which means you earn slightly more).

Compounding means the bank pays interest on your interest. If your CD compounds monthly, the bank divides the annual rate by 12, calculates interest for that month, adds it to your balance, and then calculates next month's interest on the larger amount. Daily compounding works the same way but happens 365 times a year, so you earn a bit more. The difference is small on short terms but adds up over longer ones.

You do not receive the interest in your checking account during the CD term. The interest stays in the CD and grows your balance. When the CD matures, you get the full amount—principal plus all accrued interest—in one payment.

Early Withdrawal Penalties and What They Cost You

If you need your money before the maturity date, you can withdraw it, but the bank will charge you an early withdrawal penalty. This penalty is a fee, usually expressed as a number of months' worth of interest. A common penalty is three months of interest, meaning if you withdraw early from a CD that would have earned $450 over the year, you lose $112.50 (three months' worth).

The penalty comes out of your CD balance. If you withdraw after six months, you get your $10,000 principal plus the interest you earned in those six months, minus the penalty. In some cases, if you withdraw very early, the penalty can be larger than the interest you have earned, so you actually get back less than you deposited.

Different banks set different penalties. Some charge a flat dollar amount; others charge months of interest. Before you open a CD, read the disclosure document to see what the penalty is. If you think you might need the money, a shorter-term CD (three or six months) has a smaller penalty than a longer one.

The Maturity Date and What Happens When Your CD Ends

On the maturity date, your CD automatically matures. The bank sends you a notice a few weeks before, telling you what will happen next. You have a choice window—usually 7 to 10 days—to decide what to do with the money.

Your options are: withdraw the full amount (principal plus interest) to your checking account, let the bank automatically renew the CD for another term at the current interest rate, or move the money to a different CD or savings product. If you do nothing and the bank's grace period passes, most banks automatically renew your CD for the same term at whatever rate they are currently offering.

Pay attention to the maturity notice. If interest rates have fallen since you opened your CD, the renewal rate will be lower. If rates have risen, the renewal rate will be higher. You are not locked into renewing; you can withdraw the money and shop around for a better rate elsewhere.

FDIC Insurance and How Your Money Is Protected

Money in a CD at a bank is protected by FDIC insurance up to $250,000 per depositor, per bank. This means if the bank fails, the Federal Deposit Insurance Corporation guarantees you will get your money back, up to that limit. The insurance covers the principal and all accrued interest.

If you have a CD at a credit union instead of a bank, your money is insured by the NCUA (National Credit Union Administration) under the same $250,000 limit. The protection is identical; only the insuring agency is different.

This insurance is automatic—you do not need to do anything to set up it. As long as your CD is at an FDIC-insured bank or NCUA-insured credit union, your deposit is protected. If you have more than $250,000 to deposit, you can open CDs at multiple banks to keep each one under the insurance limit.

Comparing CD Terms: How Length Affects Interest Rate

Banks offer CDs in many different time frames: three months, six months, one year, two years, three years, and five years are common. The longer you agree to lock up your money, the higher the interest rate the bank will pay you. This is called the yield curve—it reflects the fact that you are giving up access to your money for longer, so the bank compensates you with a higher rate.

A three-month CD might pay 4.0 percent, a one-year CD might pay 4.5 percent, and a five-year CD might pay 5.0 percent. The exact rates change daily and vary by bank, but the pattern is consistent: longer terms pay more. If you do not need the money for five years, a five-year CD is usually the better choice. If you might need it sooner, a shorter term protects you from a large early withdrawal penalty.

Some banks also offer no-penalty CDs, which let you withdraw your money without a penalty after a short waiting period (often seven days). These CDs pay lower interest rates than traditional CDs because you have the flexibility to leave without cost. They are useful if you want a higher rate than a savings account but are not sure you can commit to a full term.

How CD Rates Are Set and Why They Change

Banks set CD rates based on the federal funds rate, which is the interest rate the Federal Reserve uses to influence the broader economy. When the Fed raises its rate, banks raise CD rates. When the Fed lowers its rate, CD rates fall. Banks also look at what competitors are offering and adjust their own rates to stay competitive.

The rate you lock in when you open your CD does not change for the life of the CD, even if the Fed raises or lowers rates after you open it. This is the trade-off: you get certainty (you know exactly what you will earn), but you also take the risk that rates will rise and you will wish you had waited. Conversely, if rates fall, you are glad you locked in the higher rate.

Shopping around matters. Banks offer different rates on the same CD term. A 4.5 percent one-year CD at one bank might be 4.2 percent at another. Over a year, that 0.3 percent difference adds up to real money on a large deposit.

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 usually a set number of months of interest. If you withdraw very early, the penalty can exceed the interest you have earned, so you get back less than you put in. Check your CD's terms to see the exact penalty before you open it.

What is the difference between a CD and a savings account?

A savings account lets you deposit and withdraw money anytime without penalty, but it pays a much lower interest rate. A CD locks your money for a set term and pays a higher rate, but you cannot touch it without a penalty. CDs are for money you know you will not need for several months or longer.

Do I have to pay taxes on CD interest?

Yes. CD interest is taxable income in the year it is earned. The bank will send you a 1099-INT form at tax time showing how much interest you earned. You report this on your tax return. If you earn more than $10 in interest across all accounts, the bank must report it to the IRS.

What happens if I do not do anything when my CD matures?

The bank will automatically renew your CD for another term at the current interest rate, which may be higher or lower than your original rate. You have a grace period (usually 7 to 10 days) to withdraw the money or move it elsewhere before the renewal locks in. Check the maturity notice the bank sends you.

Is my money safe in a CD if the bank fails?

Yes. CDs at FDIC-insured banks are protected up to $250,000 per depositor. If the bank fails, the FDIC guarantees you will get your principal and all accrued interest back. Credit union CDs are protected the same way by the NCUA.