CD stands for Certificate of Deposit, a savings account where you lock money away for a set time in exchange for a fixed interest rate

A Certificate of Deposit is a contract between you and a bank or credit union. You give them a lump sum of money, they promise to hold it untouched for a specific period—anywhere from three months to five years—and in return they pay you a may provide interest rate. When the term ends, you get your original money back plus the interest earned.

The word "certificate" refers to the document proving the account exists. The "deposit" is your money. Banks use CDs because they know exactly how long they'll have your funds, which lets them lend that money out at predictable rates. You benefit because CD rates are almost always higher than regular savings accounts—sometimes significantly higher, depending on how long you're willing to wait.

Key Takeaways

  • A CD locks your money for a set term (three months to five years) in exchange for a fixed interest rate higher than a regular savings account.
  • You cannot withdraw the money before the term ends without paying an early withdrawal penalty, which typically costs several months of interest.
  • Your money is insured up to $250,000 per account at FDIC-insured banks or NCUA-insured credit unions, so the principal is protected.
  • When the CD matures, you can withdraw the money, move it to a new CD, or let it roll over into a new term at the bank's current rate.
  • CD rates change based on what the Federal Reserve does with interest rates, so rates available today may be different next month.

How the CD term and interest rate work together

The longer you commit your money, the higher the rate you typically receive. A three-month CD might pay 4.5 percent, while a five-year CD from the same bank might pay 5.2 percent. The bank pays more for longer commitments because they want certainty about how long they can use your money.

The interest rate is fixed, meaning it does not change during the term. If you open a one-year CD at 5 percent, you will earn 5 percent for the entire year, even if rates drop to 3 percent next month. This is different from a savings account, where the rate can move up or down whenever the bank decides.

Interest compounds—usually daily or monthly—so you earn interest on your interest. A $10,000 CD at 5 percent for one year will grow to approximately $10,512.68 if interest compounds daily, not exactly $10,500.

What happens if you need the money before the term ends

This is the main trade-off of a CD: your money is locked. If you withdraw before the maturity date, the bank charges an early withdrawal penalty. The penalty amount varies by bank and by CD term—some charge three months of interest, others charge six months or a flat fee.

On a short-term CD, the penalty might wipe out all the interest you earned. On a longer-term CD, the penalty is usually smaller relative to the total interest, but it still costs you. Before opening a CD, check the bank's disclosure document for the exact penalty amount. Some banks offer "no-penalty CDs" that let you withdraw early without a fee, but these pay lower interest rates to compensate.

If you think you might need the money, a regular savings account or money market account is safer, even though the rate is lower. A CD is best when you genuinely will not touch the money for the full term.

CD maturity and what happens next

When the term ends, the CD matures. You then have a window—usually 7 to 10 days—to decide what to do with the money. You can withdraw it in full, open a new CD at the bank's current rates, or move the money to another bank's CD if rates are better elsewhere.

If you do nothing during that window, many banks automatically roll over the CD into a new term at the same length, using whatever rate the bank is currently offering. This can work in your favor if rates have risen, but it locks you in again at a lower rate if rates have fallen. Read your CD agreement to see your bank's rollover policy, and mark your calendar for the maturity date so you do not miss the window to make a choice.

FDIC and NCUA insurance protects your principal

Money in a CD at an FDIC-insured bank is protected up to $250,000 per depositor, per bank. Money in a CD at an NCUA-insured credit union is protected up to $250,000 per depositor, per credit union. This means your original deposit is safe even if the bank fails—you will get your money back from the insurance fund.

The interest you earned is also covered by this insurance. If you have more than $250,000 to invest in CDs, you can open accounts at multiple banks to stay within the insurance limit at each one. Some people also use brokered CDs, which are CDs purchased through a brokerage firm—these have different insurance rules, so research them separately if you are considering that route.

How CD rates compare to other savings options

CDs typically pay more than regular savings accounts or money market accounts at the same bank, but less than what you might earn in stocks or bonds over the same period. The trade-off is safety and certainty: you know exactly what you will earn, and your principal is insured.

High-yield savings accounts at online banks sometimes offer rates close to CD rates without locking your money away, so compare both before deciding. If you need liquidity—the ability to access your money without penalty—a high-yield savings account may be better. If you want the highest may provide rate and can commit to leaving the money alone, a CD is usually the stronger choice.

Frequently Asked Questions

Can I add money to a CD after I open it?

No. A CD is a fixed contract for a fixed amount. You cannot add deposits to an existing CD. If you want to invest more money, you must open a separate CD. Some banks let you open multiple CDs at different terms, which is called a CD ladder—it lets you have money maturing at different times.

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

A savings account has no term and no penalty for withdrawal, but the interest rate is lower and can change anytime. A CD locks your money for a set period, pays a higher fixed rate, but charges a penalty if you withdraw early. Choose a savings account if you need access to the money; choose a CD if you can commit to leaving it alone.

Do I 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. Some people use CDs in retirement accounts (like an IRA) to defer taxes, but that is a separate decision.

What happens if the bank fails while my CD is open?

Your money is protected by FDIC or NCUA insurance up to $250,000. You will receive your principal plus any interest earned up to the failure date. The insurance fund pays out, not the bank. This protection is automatic—you do not need to do anything.

Can I shop around for the best CD rates?

Yes. CD rates vary significantly between banks and credit unions. Online banks often offer higher rates than brick-and-mortar banks. Check multiple institutions before opening a CD. Websites that track CD rates can help you compare, but always verify the rate directly with the bank before committing.