What a Certificate of Deposit Is and How You Use It

A certificate of deposit (CD) is an account where you give a bank a sum of money for a fixed period of time—typically three months to five years—and the bank pays you a set interest rate on that money. You cannot withdraw the funds before the maturity date without paying a penalty, usually a loss of some or all of the interest you earned. When the CD reaches its maturity date, you get back your original deposit plus the interest.

The trade-off is straightforward: you lock up your money in exchange for a higher interest rate than you would get in a regular savings account. Banks use your deposit to lend to other customers, so they reward you for leaving the money untouched.

Key Takeaways

  • You deposit a fixed amount of money with a bank for a set time period, and the bank pays you a may provide interest rate on that deposit.
  • Your money is locked in until the maturity date; withdrawing early triggers a penalty that typically costs you some or all of the interest earned.
  • Interest rates on CDs are higher than savings accounts because the bank knows exactly how long it will hold your money.
  • When the CD matures, you receive your original deposit plus all accrued interest, and you can then choose to renew, withdraw, or move the money elsewhere.
  • CDs are insured by the FDIC up to $250,000 per depositor per bank, making them a low-risk savings tool.

How Interest Accrues on Your Certificate

When you open a CD, the bank tells you the annual percentage rate (APR) you will earn. This rate is fixed for the entire term—it will not change, even if the bank's rates drop or rise. The interest compounds, meaning you earn interest on your interest, though the frequency of compounding (daily, monthly, or quarterly) depends on the bank's terms.

For example, if you deposit $5,000 in a one-year CD at 4.5% APR with daily compounding, the bank calculates your interest each day and adds it to your balance. By the end of the year, you will have earned roughly $231 in interest (the exact amount depends on the compounding method). You do not have to do anything—the interest straightforward accumulates in the account.

Some banks pay interest monthly or quarterly, depositing it into a linked savings account or back into the CD itself. Read your CD agreement to see when and how often interest is paid.

What Happens If You Need Your Money Early

The main restriction of a CD is that you cannot touch your money without a penalty. If you withdraw before the maturity date, the bank charges an early withdrawal penalty, which is usually a certain number of months' worth of interest. A common penalty is three to six months of interest, though some banks charge more.

If you withdraw early and the penalty exceeds the interest you have earned, you lose part of your original deposit. For instance, if you earned $100 in interest but the penalty is $150, you walk away with $4,950 of your original $5,000. This is why CDs work best for money you know you will not need during the term.

Some banks offer no-penalty CDs that let you withdraw without a fee, but these come with lower interest rates to compensate the bank for the flexibility. If you think you might need the money, a no-penalty CD or a high-yield savings account may be a better choice.

What Happens When Your CD Matures

When your CD reaches its maturity date, the bank sends you a notice (usually 10 to 30 days before) telling you what will happen next. You have several options: withdraw the money, renew the CD for another term at the current rate, or move the funds to a different account or bank.

If you do nothing, many banks automatically renew your CD for the same term at whatever rate they are currently offering. This can work in your favor if rates have risen, but it locks you in again if rates have fallen. Read the maturity notice carefully and act before the important date if you want to do something other than renew.

When you withdraw, you receive your original deposit plus all the interest earned, minus any taxes owed. The bank will send you a 1099-INT tax form if you earned $10 or more in interest, because CD interest is taxable income.

How CD Terms and Rates Compare

Banks offer CDs with different time periods, and the longer you lock up your money, the higher the rate is usually (though not always). A three-month CD might pay 4.0% APR, while a five-year CD at the same bank might pay 4.8%. This rewards you for committing your money for longer.

Interest rates also vary widely between banks. Online banks often pay higher rates than brick-and-mortar banks because they have lower overhead costs. It is worth comparing rates across several banks before you open a CD, because a difference of 0.5% APR can add up to hundreds of dollars over a few years.

Some banks also offer special promotions—higher rates for a limited time, or bonus interest if you open multiple CDs. These deals come and go, so check a few banks' websites to see what is currently available.

FDIC Insurance and Safety

CDs held at banks insured by the Federal Deposit Insurance Corporation (FDIC) are protected up to $250,000 per depositor per bank. This means if the bank fails, you will get your money back up to that limit. Credit unions offer similar protection through the National Credit Union Administration (NCUA).

If you have more than $250,000 to deposit, you can spread it across multiple banks or multiple account types at the same bank to stay within the insurance limit. For example, a CD in your name and a CD in a joint account with your spouse are insured separately, so you could have $500,000 total protected at one bank.

CDs are among the safest places to put money because your principal is may provide and insured. You do not have to worry about market risk the way you would with stocks or bonds.

Frequently Asked Questions

Can I add more money to my CD after I open it?

No. A CD is a fixed deposit—you cannot add funds once it is opened. If you want to deposit more money, you must open a separate CD. Some banks let you open multiple CDs at different times or with different terms.

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

A savings account has no lock-in period and lets you withdraw anytime, but it pays a much lower interest rate. A CD locks your money for a set term but pays significantly more interest. Choose a savings account if you need flexibility, and a CD if you have money you will not need for months or years.

Do I pay taxes on CD interest?

Yes. CD interest is taxable income in the year it is earned, even if you do not withdraw the money. The bank sends you a 1099-INT form for tax purposes. If you are in a high tax bracket, this reduces the real return on your CD.

What happens if interest rates rise after I buy a CD?

Your rate stays the same for the entire term—it is locked in. If rates rise, you will earn less than you could with a new CD. When your CD matures, you can open a new one at the higher rate, or consider a no-penalty CD if you want more flexibility.

Is there a minimum amount I have to deposit?

Minimum deposits vary by bank and CD type. Some banks require $500 or $1,000, while others have no minimum. Online banks often have lower minimums than traditional banks. Check the bank's website or call to find out what they require.