What is a CD (certificate of deposit)?

Summary

• What is a certificate of deposit (CD) account? It’s a savings product from banks and credit unions that pays a fixed interest rate for a set period of time, called a “term.”

• Because the rate is usually fixed, CDs offer steady, predictable earnings, making it easier to plan ahead with confidence.

• CDs often provide higher returns than regular savings accounts in exchange for keeping your money deposited until the maturity date, i.e. the end date of the investment. If you need to take your money out before the term ends, you may be required to pay a penalty.

• Understanding how CDs compare with other savings options can help you choose the approach that feels right for your goals and comfort level.

CDs have been part of modern investing since the 1960s and have been around in some form for centuries. Yet many people still have basic questions about them, like “What is a certificate of deposit?” and “How does a CD work?”

For kids of the 1990s, CD stands for “compact disc.” But the CD meaning in banking is “certificate of deposit.”

So, what is a CD account? The definition of certificate of deposit is an account that allows you to save money typically at a fixed interest rate for a fixed amount of time—say, six months, one year or five years, according to Investor.gov. In exchange for leaving your money in the account, banks offer an interest rate that’s usually higher than those offered by a traditional savings account. 

How does a CD work? Let’s unpack everything you need to know about this important savings tool.

CD accounts typically come with fixed terms, minimum balance requirements and interest rate structures that influence overall returns. Terms often range from a few months to several years. In many cases, longer-term CDs may offer higher interest rates than shorter-term options, though rates vary depending on market conditions and the financial institution.

Some institutions require a minimum opening deposit to earn the advertised annual percentage yield (APY). Minimum balance requirements can range from small amounts to several thousand dollars, depending on the account type and bank policies. Higher deposit amounts may qualify for better rates at some institutions.

Most CD accounts offer fixed interest rates, meaning the APY remains the same throughout the term. This structure provides predictable earnings and can make it easier to determine returns. However, locking funds into a CD for a longer period may reduce access to money if rates increase elsewhere during the term.

A CD is a way to put away money beyond what you’ve put in your savings account without taking on much more market risk. If you’re asking, “How does a certificate of deposit work?” here’s a quick example. Think of it like buying a baseball card for your favorite player, knowing its value will go up when he retires in a year or two. Only in this case you know exactly when he’ll retire and exactly how much the card will be worth when he does.

Wondering how to invest in CDs? You deposit a specific amount of money—say $5,000 or $10,000—into an account and agree to keep it there for a set amount of time in exchange for a set interest rate. So if you open a $10,000 one-year CD with a 2.25% APY, after a year your account would be worth $10,225—assuming you keep interest payments in the account.

CD terms, minimum balances and interest rates can vary widely, and each factor plays a role in shaping your potential returns. 

• What is a CD term? A CD term is the length of time you agree to keep your money in the bank. They typically range from a few months to several years with longer terms often offering higher fixed rates. 

• What are typical minimum balance requirements? Minimum balance requirements vary by financial institution. While some CDs ask for a larger opening deposit, others can be opened with a relatively small amount.

• What role do interest rates play in CDs? Interest rates are usually fixed for the whole term, which means your earnings are predictable. Rates can vary by institution and term length, so comparing options will help you maximize your return.

Now that we’ve answered the questions “What is a CD account?” and “How does a certificate of deposit work?” let’s talk about the benefits.

“The reason that people are really drawn to CDs is that you can get a higher return than you would get in either a traditional checking account or traditional savings account,” says Kimberly Palmer, personal finance expert.

Because CDs are offered across a wide range of terms, you can get creative with how you take advantage of them. Whether your savings goals are big or small, long- or short-term, there’s a CD savings strategy that could work for you.

“CDs are good for short-term or near-term liquidity needs,” says Philip Gibson, an associate professor of finance.

How do certificates of deposit work out to be a better short-term option than cash? Money within a CD will have grown thanks to the competitive interest rate. 

However, CDs aren’t ideal for storing cash that you might need at a moment’s notice. If you pull out your money from a CD before the end of its term, you could be on the hook for an early withdrawal penalty. When quick access is a priority, you’d be better off using a checking account or savings account.

A CD’s interest rate and APY are closely related, but they aren’t the same thing. The interest rate refers to the base rate the financial institution pays on the account balance. APY reflects the total amount you could earn in a year after accounting for compound interest, i.e. earning interest on your interest.

For example, a CD with a 4.00% interest rate compounded monthly may have an APY of about 4.07%. The difference exists because the interest earned each month is added back to the balance, allowing future interest calculations to build on prior earnings. The more frequently interest compounds, the higher the APY may be, compared to the stated interest rate. Two CDs might list similar interest rates, yet their APYs can differ depending on how frequently interest is added to the account. 

One drawback of CDs is the lack of flexibility. Unlike a savings account, you can’t withdraw the money whenever you want—at least not without paying a penalty in many cases. Most banks charge you some of your interest earned over time, and maybe even part of your original investment, if you decide to withdraw early. An important question you should ask before you commit is, “What is the penalty for early withdrawal from a CD?”

Another disadvantage is that CD interest rates can sometimes struggle to keep up with inflation. When inflation rises, the value of your dollar goes down. So if you invest $1,000 in a one-year CD with a 1.5% interest rate, and inflation rises 1.9% in that same year, your money will be less valuable at the end of the year.

Choosing a CD account starts with knowing your savings timeline and what you’re ultimately trying to fund. Maybe you’re setting money aside for a weekend vacation or your upcoming wedding. CD terms can run from a few months to several years, so the right fit depends on when you’ll want that money back. A shorter-term CD can work well for near-term goals, while a longer-term option may help you lock in a steady rate for a while.

Interest rates matter too. Banks usually advertise the APY, which shows how much you’ll earn over a year with compounding. Comparing APYs across different terms and institutions can help you see your potential return. It’s also worth checking whether the rate stays fixed and whether there are any minimum deposit requirements before you commit. Opening a Capital One 360 CD allows you to lock in a rate that’s above the national average, ensuring your savings grow steadily over time.

If you like the sound of CDs but want to keep your money easy to access, you might consider building a CD ladder. That’s a plan in which you open multiple CD accounts for different amounts of time—six months, one year, two years and so on.2 This allows you to reap the benefits of a longer savings timeline while still being able to access some of your money along the way.

Say you’ve saved up enough in your savings account to cover yourself in a financial emergency. You have an additional $10,000 you want to put away, and you don’t think you’ll need the money for a while. You want to earn a little more than you do in that savings account, but you’re not ready to invest in the stock market. What do you do?

You could put all $10,000 in a five-year CD. But then you couldn’t touch the money for five years without facing a penalty. That’s where the ladder comes into play. Instead, you could break the $10,000 into smaller chunks and buy five CDs—a one-year, two-year, three-year, four-year and five-year—allowing you to earn a little more interest each year while keeping yearly access to some of your funds. Then, once you withdraw the money after a year or two, you can decide whether to spend it or put it into another CD, either in a new five-year CD or something different.

“That means that the terms keep coming due, and you continually have access to your money,” Palmer says.

Banks may offer some flexibility around when you receive interest payments, allowing you to decide whether to have the interest paid monthly or semiannually, according to Investor.gov.

CDs, savings accounts and money market accounts are all deposit products designed to help people save money, but they differ in structure, access and interest rate features.

• CDs typically require you to park money without withdrawing it for a set term, which can range from a few months to several years. In exchange, CDs generally offer a fixed interest rate for the length of the term. Because the rate is locked in, returns remain predictable until maturity. Early withdrawals may involve a penalty, depending on the institution and account agreement.

• Savings accounts are generally designed for ongoing deposits and withdrawals, offering more immediate access to funds. Interest rates on savings accounts are usually variable, meaning they can change over time based on market conditions and the institution’s policies.

• Money market accounts combine features of both savings and transaction accounts. They may provide limited check-writing or debit access while also offering variable interest rates. Some institutions require higher minimum balances for certain money market accounts or tiered rate structures tied to account balances.

The big upside of CDs is how reliable they are. Because of the fixed rate and specific term, you’ll know exactly how much money you’ll have when you reach the end of your investment. Plus, they’re typically insured by the Federal Deposit Insurance Corporation (FDIC) up to allowable limits, meaning your money is safe from a bank failure at FDIC-insured institutions.

“It’s best for someone who doesn’t need their money immediately,” Palmer says. “In exchange for that longer period of time where your money is inaccessible, you earn a higher return.”

Understanding how CDs work can help you decide whether they fit into your savings strategy and long-term financial goals.

• What is a certificate of deposit? A certificate of deposit (CD) is a savings account that pays a fixed interest rate for a set period of time. They often offer higher returns than traditional savings accounts in exchange for keeping your money on deposit until maturity.

• How do CDs work? CDs provide steady earnings through fixed rates and terms, which can make them a useful option for short- and medium-term savings goals.

• How do you compare CDs? Consider factors such as term length, minimum deposit requirements, interest rates, penalties for early withdrawal and annual percentage yield (APY).

Now that you know what a certificate of deposit is and how CDs can work for you, it’s time to get your savings plan started. 

Locking in a strong rate today with a Capital One 360 CD ensures your money is working as hard as you do.