What a CD actually does with your money

A certificate of deposit (CD) is an agreement between you and a bank. You give the bank a sum of money—say $5,000—and the bank promises to pay you back that amount plus interest on a specific date in the future. That future date is called the maturity date. Until that date arrives, your money stays locked in the CD. You cannot withdraw it without a penalty.

The bank uses your money during that time. They lend it to other customers, invest it, or use it to run their operations. In exchange, they pay you a fixed interest rate—a percentage of your deposit that you earn just for letting them hold your money. That rate does not change, no matter what happens to interest rates in the broader economy.

When the maturity date arrives, the bank returns your original deposit plus all the interest you earned. At that point, you can withdraw the money, move it to another CD, or leave it in the same CD if the bank automatically renews it.

Key Takeaways

  • You deposit a fixed amount of money and receive a may provide interest rate that does not change for the entire term of the CD.
  • Your money is locked until the maturity date; withdrawing early typically costs you a penalty that reduces your earnings.
  • The interest rate a bank offers depends on how long you agree to lock your money away—longer terms usually pay higher rates.
  • CDs are insured by the FDIC up to $250,000 per account holder per bank, so your principal is protected even if the bank fails.
  • When your CD matures, you can withdraw the money, open a new CD, or let the bank automatically renew it at whatever rate they are currently offering.

How the interest rate and term length connect

Banks offer different interest rates for different CD terms. A three-month CD might pay 4.50% annually, while a two-year CD at the same bank might pay 5.25%. The longer you agree to lock your money away, the higher the rate typically is. This is because the bank wants the security of knowing your money will stay with them for a longer period.

The term is the length of time until maturity. Common terms are three months, six months, one year, two years, three years, and five years. Some banks offer terms as short as 30 days or as long as ten years. You choose the term when you open the CD, and that choice determines both the interest rate you receive and when you can access your money without penalty.

The interest rate varies by bank and changes over time. When the Federal Reserve raises interest rates, banks typically raise the rates they offer on new CDs. When the Fed lowers rates, CD rates fall too. This means a CD opened today will pay a different rate than one opened three months from now.

What happens if you need your money before maturity

If you withdraw money from a CD before the maturity date, the bank charges an early withdrawal penalty. This penalty is a fee that comes out of your earnings or, in some cases, out of your principal. The size of the penalty depends on the bank and the term of the CD. 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 or more.

Example: You open a one-year CD with $5,000 at 5% annual interest. After six months, you need the money and withdraw it. The bank might charge a penalty of three months' interest—about $62.50. You would receive $5,000 minus $62.50, or $4,937.50. You lost money compared to what you would have earned if you had left it alone.

Some banks offer no-penalty CDs that let you withdraw your money early without a fee, though the interest rate on these CDs is usually lower than on traditional CDs. If you think you might need access to your money, a no-penalty CD or a shorter-term CD is a better choice than locking money away in a long-term CD you cannot touch.

How interest compounds and when you receive it

The interest you earn on a CD is usually compounded, which means the bank calculates interest not just on your original deposit but also on the interest you have already earned. The more often interest compounds, the more you earn. A CD that compounds daily will earn slightly more than one that compounds monthly, even at the same annual rate.

When you receive the interest depends on the bank. Some banks pay interest monthly, some quarterly, and some only at maturity. If interest is paid monthly or quarterly, you can usually choose to have it deposited into a linked savings account or reinvested into the CD itself. If you reinvest it, it becomes part of your principal and earns interest too.

The bank will tell you the annual percentage yield (APY) when you open the CD. This is the actual return you will earn in one year, accounting for how often interest compounds. The APY is always equal to or higher than the stated interest rate because it includes the effect of compounding.

FDIC insurance and what it protects

Money in a CD is insured by the Federal Deposit Insurance Corporation (FDIC), a government agency that protects deposits at member banks. If the bank fails, the FDIC will return your money up to $250,000 per account holder per bank. This means your principal is safe even if the bank goes out of business.

The $250,000 limit applies per depositor per bank. If you have $100,000 in a CD at Bank A and $100,000 in a CD at Bank B, both are fully insured. If you have $300,000 in CDs at the same bank, only $250,000 is insured. The interest you have earned is counted toward that $250,000 limit.

FDIC insurance covers CDs opened at banks. If you open a CD at a credit union instead, your money is insured by the National Credit Union Administration (NCUA) under the same $250,000 limit. Online banks that are FDIC members offer the same protection as brick-and-mortar banks.

CD ladders and how to use them

A CD ladder is a strategy where you open multiple CDs with different maturity dates. For example, you might open five one-year CDs, each with $1,000, but stagger the opening dates so one matures every few months. As each CD matures, you can withdraw the money, reinvest it in a new CD, or use it for something else.

The advantage of a ladder is that you get some of your money back regularly without the penalty of early withdrawal. You also benefit from rising interest rates: when one CD matures and you open a new one, you can lock in the current rate, which may be higher than the rate on your older CDs. At the same time, you still earn the higher rates that come with longer-term CDs.

Example: You have $5,000 to invest. Instead of putting it all in one five-year CD, you open five one-year CDs with $1,000 each, starting them one month apart. After one month, the first CD matures. After two months, the second matures, and so on. You have access to $1,000 every month without penalty, and you can reinvest each matured CD at whatever rate is current at that time.

What happens when your CD matures

When the maturity date arrives, the bank sends you a notice. You then have a choice: withdraw the money, open a new CD, or let the bank automatically renew the CD. If you do nothing, many banks will automatically renew your CD into a new term at whatever rate they are currently offering. Read the renewal terms carefully—the new rate may be lower than what you were earning.

If you want to move your money to a different bank or use it for something else, you can withdraw it without penalty. The bank will send you a check or deposit the money into a linked account. There is no fee for withdrawing money at maturity.

If you want to open a new CD at the same bank, you can do so immediately. The new CD will have its own term and interest rate, which may be different from your old CD. Some banks offer slightly higher rates if you renew with them, but you should always compare rates across banks before deciding where to put your money.

Frequently Asked Questions

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

No. A CD is a fixed agreement—you deposit a set amount at the beginning, and that amount stays the same until maturity. You cannot add money to an existing CD. If you want to invest more, you must open a separate CD.

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

A savings account lets you deposit and withdraw money whenever you want, but the interest rate is usually lower and can change at any time. A CD locks your money for a set period and pays a fixed, higher rate, but you cannot withdraw without a penalty. Choose a CD if you do not need the money soon; choose a savings account if you need flexibility.

Do I have to pay taxes on CD interest?

Yes. The interest you earn on a CD is taxable income. The bank will send you a 1099-INT form at the end of the year showing how much interest you earned, and you must report it on your tax return. This is true even if the interest is reinvested into the CD.

What happens if interest rates drop after I open my CD?

Your rate stays the same. That is the point of a CD—your rate is locked in for the entire term. If rates drop, you are protected and continue earning the higher rate you locked in. When your CD matures, you will have to accept whatever the new rate is at that time.

Is there a minimum amount I have to deposit to open a CD?

Yes, but it varies by bank. Some banks require a minimum of $500, others $1,000, and some have no minimum at all. Online banks often have lower minimums than traditional banks. Check with your bank for their specific requirement.