A Certificate of Deposit is a savings account where you lock up your money for a set time to earn a higher interest rate

A Certificate of Deposit, or CD, is an account you open at a bank or credit union where you agree to leave money untouched for a specific period — usually anywhere from three months to five years. In exchange for that commitment, the bank pays you a higher interest rate than it would on a regular savings account. When the time period ends, you get your original money back plus the interest earned.

The trade-off is straightforward: you give up access to your cash for a while, and the bank rewards you with better interest. If you need the money before the CD matures (reaches its end date), you will pay an early withdrawal penalty, which is usually a few months' worth of interest. The bank tells you the penalty amount upfront when you open the CD.

Key Takeaways

  • You deposit a lump sum of money and agree not to touch it until a specific maturity date, typically ranging from three months to five years.
  • CDs pay higher interest rates than regular savings accounts because the bank knows exactly how long it can use your money.
  • Your money and interest are insured by the FDIC (Federal Deposit Insurance Corporation) up to $250,000 per account at most banks.
  • Withdrawing money early triggers a penalty that reduces your earnings, so CDs work best for money you truly will not need during the term.
  • When your CD matures, you can withdraw the money, open a new CD, or let it roll over into another CD at the bank's current rate.

How the interest rate and term length work together

The longer you commit your money, the higher the interest rate the bank typically offers. A three-month CD might pay 4.5 percent annually, while a five-year CD at the same bank might pay 5.2 percent. This is because the bank wants to lock in your money for as long as possible and can lend it out with more certainty.

Interest rates change constantly based on what the Federal Reserve does with its benchmark rate. When you open a CD, your rate is locked in for the entire term — it will not go up or down, no matter what happens in the market. This is different from a savings account, where the rate can change at any time.

The bank calculates your interest in different ways depending on the CD. Some compound daily, some weekly, some monthly. Compounding means the bank pays interest on your interest, so your money grows a little faster. When you compare CDs, look at the APY (Annual Percentage Yield), which shows you the real return after compounding is factored in.

What happens when your CD reaches maturity

When your CD term ends, you enter what banks call the grace period, usually five to ten days. During this time, you can withdraw your money without penalty. If you do nothing, most banks automatically roll your CD into a new one at their current rate — you do not have to do anything, but you should pay attention because the new rate might be lower than what you had.

Many people set a calendar reminder for a few days before their CD matures so they can decide what to do. You can withdraw the full amount (principal plus interest), move it to a different bank's CD if rates are better elsewhere, or put it into a regular savings account. Some people open a CD ladder — multiple CDs with different maturity dates — so they have money becoming available at regular intervals.

Early withdrawal penalties and when they explore

If you need your money before the maturity date, the bank will charge you a penalty. This penalty is usually expressed as a number of months of interest. For example, a CD might have a three-month early withdrawal penalty, meaning if you withdraw early, you lose three months' worth of the interest you would have earned. On a smaller CD or a short-term one, this penalty might be just a few dollars. On a larger CD or longer term, it could be several hundred dollars.

The penalty comes out of your interest first. If you have earned more interest than the penalty costs, you still come out ahead. But if you withdraw very early, the penalty might eat into your original deposit, meaning you get back less than you put in. This is why CDs are best for money you are confident you will not need — an emergency fund, for instance, should stay in a regular savings account where you can access it without cost.

FDIC insurance and how your money is protected

Money in a CD at an FDIC-insured bank is protected up to $250,000 per depositor, per bank, per account type. This means if the bank fails, the federal government guarantees you will get your money back, even if the bank goes under. This protection covers both your principal and any interest you have earned so far.

If you have more than $250,000 to invest in CDs, you can spread it across multiple banks to keep everything insured. You can also open different types of accounts at the same bank — a regular CD, an IRA CD, and a joint CD with your spouse — and each one gets its own $250,000 of coverage. Credit unions offer similar protection through the NCUA (National Credit Union Administration).

How CDs compare to savings accounts and money market accounts

A regular savings account lets you deposit and withdraw money whenever you want, but the interest rate is usually much lower than a CD — often less than half. A money market account sits in the middle: it pays more than savings but less than a CD, and you can write checks or make a limited number of withdrawals each month without penalty.

The choice depends on what you need the money for. If you have an emergency fund or money you might need soon, a savings account or money market account makes sense. If you have money you will not touch for at least a few months and want the best rate the bank offers, a CD is the right tool. Some people use both: a savings account for emergencies and CDs for money they are saving toward a specific goal a year or more away.

Where to open a CD and what to compare

You can open a CD at any bank or credit union. Online banks often offer higher rates than brick-and-mortar banks because they have lower overhead costs. Before you open a CD, compare the APY across several institutions — even a difference of 0.5 percent adds up over time on a large deposit.

Also check the early withdrawal penalty. Some banks charge three months of interest; others charge six months or a full year. A lower penalty gives you more flexibility if your plans change. Read the fine print about what happens at maturity — does the bank automatically roll it over, or do you have to take action? Does it offer a grace period, and how long is it?

Frequently Asked Questions

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

No. A CD is a fixed deposit — you put in a lump sum at the start, and that amount stays the same until maturity. If you want to save more money, you open a separate CD or use a regular savings account. Some banks offer add-on CDs that let you deposit more during the term, but these are less common and usually have different terms.

What if I need my money before the CD matures?

You can withdraw it, but you will pay an early withdrawal penalty. The penalty is usually a few months of interest. Calculate whether the interest you have earned so far is more than the penalty — if it is, you still come out ahead. If you think you might need the money, a regular savings account is safer than a CD.

Do I pay taxes on CD interest?

Yes. CD interest is taxable income in the year you earn it, even if you do not withdraw the money. The bank will send you a 1099-INT form at tax time showing how much interest you earned. This is one reason some people use CDs in retirement accounts like IRAs, where the interest can grow tax-deferred.

Is my CD insured if the bank fails?

Yes, up to $250,000 per account at an FDIC-insured bank. This covers both your principal and any interest earned. If you have more than $250,000, spread it across multiple banks or account types to keep everything protected.

What is a no-penalty CD?

A no-penalty CD lets you withdraw your money early without losing interest, though you may not earn interest on the full term. These CDs typically pay less than traditional CDs because the bank has less certainty about keeping your money. They are useful if you want a higher rate than savings but need some flexibility.