A certificate of deposit is a savings account where you lock up your money for a set time in exchange for a higher interest rate

When you open a CD, you give the bank a lump sum of money—say $5,000—and agree not to touch it for a specific period. That period might be three months, one year, five years, or longer, depending on the CD you choose. In return, the bank pays you a fixed interest rate that is almost always higher than what you would earn in a regular savings account. At the end of the period (called the maturity date), you get your original money back plus all the interest it earned.

The trade-off is straightforward: you give up access to your cash for a while, and the bank rewards you for that commitment. If you need the money before the maturity date, you can withdraw it, but you will pay a penalty—usually a few months' worth of interest. That penalty is the bank's way of enforcing the agreement.

Key Takeaways

  • A CD locks your money away for a fixed period in exchange for a may provide interest rate that is higher than a savings account.
  • You choose the term length when you open the CD, and the rate stays the same for the entire period.
  • Withdrawing money early triggers a penalty, typically equal to a few months of interest, so only use a CD for money you will not need soon.
  • CDs are insured by the FDIC up to $250,000 per account, so your principal is protected even if the bank fails.
  • Interest rates on CDs vary by bank and term length, so comparing offers before you open one can save you money.

How the interest rate and term length work together

When you shop for a CD, you will see two numbers: the interest rate and the term. The term is how long you commit to leaving the money untouched. Common terms are 3 months, 6 months, 1 year, 2 years, 3 years, and 5 years, though some banks offer other lengths.

The interest rate is what the bank pays you, expressed as an annual percentage. A 5-year CD might pay 4.50% per year, while a 3-month CD at the same bank might pay only 4.00%. Generally, longer terms come with higher rates because you are giving up access to your money for longer. The bank uses your money during that time, so it pays you more for the privilege.

The interest compounds—meaning you earn interest on your interest—but the exact schedule depends on the bank. Some CDs compound daily, others monthly or quarterly. More frequent compounding means slightly more money at the end, but the difference is usually small. When the CD matures, the bank deposits your principal plus all accumulated interest into your account, or you can roll it into a new CD.

What happens if you need the money early

Life happens. You might lose a job, face a medical bill, or straightforward change your mind about locking up the money. If you withdraw from a CD before the maturity date, you pay an early withdrawal penalty. This penalty is set by the bank when you open the account and is spelled out in the contract you sign.

The penalty is usually expressed as a number of months of interest. A CD with a three-month penalty means you lose three months' worth of the interest you would have earned. If your CD was paying $100 per month in interest and you withdraw after six months, you might owe a $300 penalty (three months × $100). You still get your original principal back, but the penalty comes out of the interest you earned.

Some banks offer no-penalty CDs, which let you withdraw early without a penalty. The trade-off is that these CDs pay a lower interest rate than standard CDs. Whether a no-penalty CD makes sense depends on how certain you are that you will not need the money. If there is any chance you might need it, the lower rate might be worth the flexibility.

FDIC insurance and what it protects

When you open a CD at a bank, your money is insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per account. This means if the bank fails, the FDIC will return your money—principal and interest earned up to the maturity date—up to that limit. You do not have to do anything to get this protection; it is automatic.

The $250,000 limit applies per depositor, per bank, per account type. If you have $250,000 in a CD at Bank A and $250,000 in a CD at Bank B, both are fully insured because they are at different banks. If you have two CDs at the same bank totaling $400,000, only $250,000 is insured. Joint accounts (held by two people) have a separate $250,000 limit, so a couple could have $500,000 insured at one bank if they each hold $250,000 in their own name and $250,000 in a joint account.

FDIC insurance does not protect you from the early withdrawal penalty. If you withdraw early and pay a penalty, that penalty is your loss, not the bank's responsibility. The insurance only covers the bank failing, not your own decision to access the money.

How CD rates compare to other savings options

CDs almost always pay more interest than a regular savings account at the same bank. A savings account might pay 0.01% while a one-year CD pays 4.00%. The difference adds up quickly on larger amounts. On $10,000, that gap means $400 per year in extra interest from the CD.

Money market accounts sometimes pay rates close to CDs, but they usually come with check-writing or debit card access, which means you can spend the money whenever you want. That flexibility costs you—the rate is typically lower than a CD for the same term. High-yield savings accounts (offered mostly by online banks) can pay rates competitive with short-term CDs, but again, the money stays accessible.

Treasury bills and bonds are another option if you have larger amounts to invest. They are backed by the U.S. government rather than the FDIC, and rates vary based on what the government is offering. For most people saving under $250,000, a CD is simpler and offers comparable safety and returns.

Shopping for CDs and comparing offers

CD rates change constantly, and different banks offer different rates for the same term. A one-year CD at Bank A might pay 4.25% while Bank B pays 4.75% for the same term. Over a year, that 0.50% difference means real money. On $25,000, it is $125 in extra interest.

Online banks typically offer higher CD rates than brick-and-mortar banks because they have lower overhead costs. You can compare rates across multiple banks on financial websites, though you will need to visit each bank's website to open the account. The process is straightforward: you provide your name, address, Social Security number, and funding information (usually a bank account to transfer money from), and the CD opens within a day or two.

When comparing, look at the annual percentage yield (APY), not just the interest rate. APY accounts for how often interest compounds, so it is the true number to compare across banks. Also read the early withdrawal penalty before you commit. A CD with a high rate but a steep penalty might not be worth it if you think you might need the money.

When a CD makes sense and when it does not

A CD is a good choice if you have money you will not need for a specific period and you want a may provide return with no risk (up to the FDIC limit). Common reasons to open a CD include saving for a down payment on a house in two years, setting aside money for a known expense like a car replacement, or straightforward parking cash you do not want to spend.

A CD is a poor choice if you might need the money unexpectedly. The early withdrawal penalty eats into your gains, and you might end up with less than you would have earned in a regular savings account. CDs are also not ideal if interest rates are rising and you expect them to keep rising—you lock in the current rate, and if rates go up next month, you cannot take advantage without paying a penalty.

If you are uncertain about how long you can commit, a shorter-term CD (three or six months) or a no-penalty CD is safer than a long-term one. You can always roll the money into a new CD when the first one matures, and you will have the chance to lock in a new rate if rates have changed.

Frequently Asked Questions

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

No. Once you open a CD, the amount is fixed. You cannot add more money to that specific CD. If you want to invest additional funds, you must open a separate CD. Some banks let you open multiple CDs at once if you want to stagger maturity dates or diversify across different terms.

What happens to my CD when it matures?

When the maturity date arrives, the bank deposits your principal plus all interest into your account (usually a checking or savings account you link to the CD). You then decide whether to open a new CD, move the money elsewhere, or spend it. Some banks automatically roll the money into a new CD at the current rate if you do not tell them otherwise, so check your account terms to avoid surprises.

Is the interest on a CD taxable?

Yes. The interest you earn on a CD is ordinary income and must be reported on your tax return. The bank will send you a 1099-INT form at the end of the year showing how much interest you earned. This is true even if you do not withdraw the money—you owe taxes on the interest as it accrues, not just when you withdraw.

Can I use a CD as collateral for a loan?

Yes. Some banks will lend you money using your CD as collateral, which means you keep the CD and the interest it earns while borrowing against it. The interest rate on the loan is usually lower than a personal loan because the bank has your CD as security. You still cannot withdraw from the CD without paying the early withdrawal penalty, but you can borrow against it.

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

A CD is issued by a bank and insured by the FDIC. A savings bond is issued by the U.S. Treasury and backed by the government. Savings bonds typically have longer terms (20 to 30 years) and lower rates, but they are extremely safe. For most people saving smaller amounts for shorter periods, a CD is more practical.