What Is a Certificate of Deposit (CD) and How Does It Work?

Got some extra cash you won't need right away? Don't let it lounge around earning next to nothing. A certificate of deposit (CD) can put that money to work—earning more interest in exchange for a bit of patience.

RELATED: Explore Synchrony Bank's CD interest rates.

What Is a Certificate of Deposit Account?

A certificate of deposit (CD) is a type of savings account that generally offers a higher interest rate than that of traditional savings accounts. However, after depositing your money, it's locked in for a fixed term, such as six months, a year or even longer depending on the options available.

CDs are also considered one of the safest places to stash savings you don't need right away—as long as they're held at an FDIC-member bank. These institutions provide federal insurance on eligible balances, meaning your money is protected up to the legal limit if the bank or credit union fails.

Since CDs offer a fixed interest rate, your return is guaranteed. No stock market drama. No surprises. Just a set-it-and-forget-it savings tool for money you won't need in the short term.

Specialty CD accounts

When comparing CD options, it's helpful to understand the unique features some accounts offer.

Here are five common types of specialty CDs:

How Does a Certificate of Deposit Work?

With a CD account, you decide how much money to deposit and how long to keep it locked in—within the bank's available terms, of course. Below are some key features to compare when shopping for a CD that best fits your needs.

Minimum required deposits

CDs may require a minimum deposit to open (e.g., $500, $1,000, etc.), but this isn't a universal rule. Some financial institutions offer CDs with no minimum deposit requirements, giving you more flexibility to allocate your savings across multiple accounts or terms.

Typically, you need to deposit a lump sum (known as the principal) within a set number of days after opening the CD account. If you don't, the account may be canceled or simply remain unfunded until action is taken.

Fixed rates, fixed terms and maturity dates

CDs offer a fixed interest rate, which means your return is guaranteed and won't change with market fluctuations. You will choose a fixed term (e.g., six months, one year, etc.). upon opening the account and must agree to leave the funds untouched until the fixed term ends (also known as the maturity date). The fixed rate and available terms will vary by institution.

Early withdrawal penalties

If you withdraw funds from your CD account early, the bank usually charges an early withdrawal penalty. This penalty often eats into the interest you've earned and, in some cases, may even dip into your principal. Some types of CD accounts, like Synchrony Bank's No-Penalty CD, may allow you to withdraw funds before the maturity date.

Determining CD interest rates and APY

CD interest rates depend on a few key factors:

• Market interest rates: Banks usually base their CD rates on what the Federal Reserve is doing. If the Fed raises rates, CD rates may go up, too. If the Fed cuts rates, CD rates often drop.
• The financial institution: Different banks will offer different interest rates.
• CD term and features: Generally, longer terms offer higher interest rates—but not always. Sometimes short- or mid-term CDs can be more attractive, depending on market conditions.
• Type of CD: Special CDs—like no-penalty CDs (which let you withdraw early), bump-up CDs (which let you raise your rate if rates go up) or jumbo CDs (which require big deposits)—can have different rates than standard ones.

In general, the longer the term of the CD, the higher the interest rate and yield that you will earn. That's because banks often reward you for locking in your money for a longer term. However, this isn't a guarantee—rate curves can flatten or invert depending on the market.

The interest rate on a CD is usually fixed, and your annual percentage yield (APY) reflects the total amount you'll earn in a year, factoring in how often the interest compounds. More frequent compounding interest—daily or monthly instead of annually—means more money in your pocket at the end of the term.

Let's say you deposit $5,000 in a one-year CD with a 4.0% APY and annual compounding. At maturity, you'd earn about $200, for a total of $5,200. However, if you opt for a three-year CD at the same 4.0% APY, you'd earn around $624 in interest over the full term, for a total of $5,624—averaging about $208 per year, thanks to the longer term and the power of compound interest.

Note: Actual results may vary based on compounding frequency. Some CDs compound daily, others monthly or annually.

Renewals, grace period and cashing out

As your CD nears its maturity date, it's a good idea to start considering your next move. Many banks, including Synchrony Bank, will send a maturity notice around 30 days in advance. That's your cue to decide whether you want to renew the CD, change the term, withdraw your funds or add more money.

When your CD reaches maturity, you'll typically have a grace period—Synchrony Bank offers 10 days—where you can take action without penalty. During this window, you can:

• Withdraw your funds
• Add to your balance
• Change the term or move the money into a different CD

Typically, if you don't do anything during the grace period, your CD will automatically renew for the same term at the current interest rate. The new rate might be higher or lower, depending on market conditions. A few weeks after the renewal, some institutions (like Synchrony Bank) will send a renewal confirmation letter so you know where things stand.

If you choose to cash out at maturity, you will receive your original deposit plus all the interest you've earned—with no penalties, since you waited until the CD reached full maturity.

Advantages of Investing in CDs

Some benefits of CDs include:

• Safety. A CD is one of the safest savings vehicles you can choose. The interest rate is fixed and guaranteed, and your deposit is insured by the FDIC (up to $250,000 per depositor, per institution, per account type), as long as the bank is an FDIC member.
• Predictability. Since the interest rate is locked in, you'll know exactly how much you'll earn by the time the CD matures—no market swings or surprises.
• Competitive interest rate. CDs typically offer higher interest rates than other FDIC-insured products such as savings, checking and money market accounts.

Considerations and Limitations

While CDs offer safety and predictability, they aren't the right fit for every financial situation. Here are some reasons a CD might not be your best option:

• Early withdrawals can mean penalties. CDs work best when you leave your money untouched until maturity. If you withdraw early, you'll likely get hit with a penalty—often forfeiting some or all of the interest you earned, and in some cases, even dipping into your principal.
• You might miss out on higher earnings. If you tie up too much cash in a long-term CD, you might miss out on higher yield investments or more flexible accounts that offer better returns as rates rise.
• CDs are not ideal for certain financial goals. CDs aren't designed for long-term growth like saving for retirement. They're also not the best place to park your emergency fund, as you may need to suddenly tap into those dollars to cover unexpected costs.
• Fixed rates can work for or against you. A fixed rate protects you if interest rates fall—but if rates go up, your money is stuck earning a lower return. In a rising-rate environment, that can mean lost earning potential.
• Not all CDs have higher rates. Some CDs offer lackluster returns, especially short-term ones. It can pay to shop around and compare rates, terms and conditions to get the best rate.

CD Ladders: A Brief Overview

A CD ladder is a smart strategy that helps you balance higher interest rates with regular access to your money. Instead of putting all your cash into one long-term CD, you split it across multiple CDs with staggered maturity dates—like the rungs of a ladder, each spaced out over time.

As each CD matures, you can either reinvest the money into a new, longer-term CD (ideally with a higher rate) or use the funds (if needed). This gives you steady access to portions of your savings while still taking advantage of better returns on longer terms.

READ MORE: How CD Ladders Work

Steps to Open a CD

You can open a CD at most banks, credit unions, or online financial institutions that offer them. With Synchrony Bank, the process is quick and can be done entirely online in mere minutes.

Most financial institutions—including Synchrony Bank—will ask for the following to open a CD account:

• Full legal name
• Mailing address
• Social Security number or tax ID
• A government-issued photo ID (like a driver's license or passport)
• Bank account information to fund the CD (checking or savings)

In some cases, you may be asked for additional background information, such as your employment status or financial history, to help the institution meet regulatory requirements.

If you're already a Synchrony Bank customer

Simply sign in to your online account and follow the prompts to open a new CD. You can fund the CD using an existing Synchrony account or by linking a non-Synchrony bank account.

If you're a new Synchrony Bank customer

Choose your preferred CD, click “Start Saving Now" and follow the steps to create an account, verify your identity and make your initial deposit.

Alternatives to CDs

A big advantage of a CD is the higher interest rate you earn in exchange for locking in your money for a set period. That fixed term can also be helpful from a behavioral standpoint—you're probably less likely to dip into your savings when there's a penalty for early withdrawal.

However, if you need more flexibility or access to your funds sooner, a CD might not be the right fit. Other low-risk options might suit you better, such as:

• High yield savings accounts: These typically offer competitive interest rates and let you withdraw money at any time. Rates may vary with market conditions.
• Money market accounts: These also offer flexibility and may provide check-writing or debit access, with slightly higher yields than those of traditional savings accounts.

READ MORE: Compare Savings Products

Final Say: Are Certificates of Deposit Worth It?

A CD can be a smart move if you have a stash of cash you won't need in the near future. In exchange for locking up your funds for a set term, you'll earn higher interest than typically offered from a regular savings account—with minimal risk.

If stability, predictable returns and FDIC protection (assuming you're with an insured institution) align with your goals, a CD could be a great fit for part of your savings strategy. Explore Synchrony Bank's CD options to see if one lines up with your financial needs.

READ MORE: See today's rates for a Synchrony Bank CD.