How Do Certificates of Deposit Work?

A certificate of deposit, commonly called a CD, is a savings account that lets you earn a fixed interest rate in exchange for leaving your money deposited for a set period of time. You open the CD with a one-time deposit, select a term, and allow the money to earn interest until the CD reaches its maturity date.

CDs can be useful when you have money you want to grow but do not expect to need immediately.

Key Takeaways

A CD provides a fixed interest rate for a specific period of time.
CDs work best for money you are confident you will not need before the maturity date.
Withdrawing money before maturity will usually result in an early withdrawal penalty.

How Do I Open a CD?

The basic process of opening a CD is straightforward:

Choose a CD and term. Banks may offer terms lasting anywhere from a few months to several years.
Make an initial deposit. Traditional CDs are usually funded with one lump-sum deposit when the account is opened.
Lock in your interest rate. The CD earns the agreed-upon rate for the full term.
Interest dividends build over time. Your money continues earning interest until the CD reaches maturity.
Decide what to do at maturity. You can withdraw the money, transfer it to another account, or renew it in a new CD.

When you put funds into a CD, the primary tradeoff is access. You receive the predictability of a fixed rate, but you agree to keep your money in the account until the term ends.

How Does a CD Rate Lock Work?

The interest rate on a traditional CD is fixed when you open and fund the account. That rate remains the same throughout the term, even when interest rates in the broader market change.

This stability differs from a traditional or high-yield savings account, where the bank can adjust the rate over time. A CD gives you greater certainty because you can estimate how much interest you will earn before opening the account.

Several factors determine the interest rate of your CD:

Term length
Current market interest rates
The bank’s current deposit needs
The amount deposited (for CDs with balance tiers)

Locking in a rate creates a tradeoff. If market rates fall during your term, your CD continues earning the higher locked rate. If market rates rise, your CD will continue earning its original rate until maturity.

Longer CD terms do not automatically offer higher rates. Depending on market conditions, a six-month or 12-month CD may pay more than a two-year CD.

What Happens When Your CD Matures?

A CD matures when it reaches the end of its term. A 12-month CD, for example, reaches maturity 12 months after you open and fund it.

After maturity, banks generally provide a window when you can decide what to do with your money. You can:

Withdraw the principal and earned interest
Transfer the money to another account
Renew the CD for the same term
Place the money into a CD with a different term
Change the deposit amount before opening a new CD

Many CDs automatically renew after a set period of time. For example, Zynlo Bank offers a 10-day grace period to withdraw, transfer, or reinvest your money after your CD ends. If you do not take action, the CD automatically renews for the same term at the rate available at that time.

What are the Different Types of CDs?

CDs come in several forms, each offering a different balance of interest, flexibility, and access to your money. Understanding how the options differ can help you choose the CD that best matches your savings timeline and financial goals.

Traditional CD

A traditional CD has a fixed rate, a fixed term, and a one-time opening deposit. Withdrawing money before maturity usually results in a penalty.

This is the standard type of CD and the version most people think of when discussing how CDs work. ZYNLO Bank offers traditional CDs^‡.

No-Penalty CD

A no-penalty CD allows you to withdraw your money before maturity without paying the traditional early withdrawal penalty.

In exchange for that flexibility, a no-penalty CD typically offers a lower rate than a comparable traditional CD. Banks may also require you to wait a certain number of days after opening the account before withdrawing funds.

Bump-Up CD

A bump-up CD allows you to request a rate increase when the bank begins offering a higher rate on a comparable CD during your term.

These accounts typically limit the number of rate increases you can request. The starting rate may also be lower than what a traditional CD offers.

Step-Up CD

A step-up CD includes scheduled rate increases during the term. Instead of requesting a higher rate, you know in advance when and how the rate will change.

IRA CD

An IRA CD follows the basic mechanics of a traditional CD but is held within an individual retirement account.

The IRA determines the account’s tax treatment and withdrawal rules, while the CD provides the fixed term and rate. An IRA CD is designed for retirement savings rather than short-term goals.

CD Laddering: Flexibility Without Giving Up the Fixed Rate

A CD ladder is a savings strategy in which you divide your money among several CDs with different maturity dates. Instead of locking your entire deposit into one CD, you create regular opportunities to access part of the money.

For example, you could divide $10,000 equally among four CDs:

$2,500 in a six-month CD
$2,500 in a 12-month CD
$2,500 in an 18-month CD
$2,500 in a 24-month CD

The first CD matures after six months. At that point, you can withdraw the money or reinvest it in a new CD. Another CD then matures six months later, creating regular access to portions of your savings.

Meanwhile, the remaining CDs continue earning their locked-in rates. This can help you balance predictable earnings with more frequent access to your money.

A ladder does not eliminate early withdrawal penalties. Instead, it reduces the likelihood that you will need to break every CD at once. Learn more about how to structure one in our guide to CD laddering.

ZYNLO Bank Provides Industry-Leading CD Options

ZYNLO offers traditional CDs^‡ with terms ranging from six to 24 months, allowing you to choose a timeline that fits your savings goal. There is no minimum deposit required to open a ZYNLO CD, and only $0.01 is required to earn the stated APY.

We offer CDs in six-, 12-,18-, and 24 month increments, giving you several options based on how long you want to keep your money on deposit. Review our rate sheet to compare current APYs and find the term that best fits your savings goals.

ZYNLO CDs^‡ also have no monthly maintenance fees and can be opened online. Compare current rates, estimate your potential earnings, and select a term to open your Certificate of Deposit today.

Frequently Asked Questions

Are CDs FDIC Insured?

CDs held at an FDIC-insured bank, such as ZYNLO Bank, are generally covered up to applicable legal limits. Standard FDIC deposit insurance is generally $250,000 per depositor, per insured bank, for each account ownership category. Deposits held across different divisions or brands of the same insured bank may be combined when calculating coverage.

Can I Take Money Out of a CD Before it Matures?

Most banks allow you to close a CD before maturity, but a traditional CD will generally charge an early withdrawal penalty. Depending on the account terms and how early you withdraw, the penalty may reduce your earned interest or part of your original principal.

How is CD Interest Calculated and Paid Out?

CD interest is calculated using factors such as your balance, interest rate, compounding frequency, and term. Depending on the account, interest may be credited monthly, quarterly, annually, or at maturity. The APY reflects the effect of compounding and is useful when comparing CDs.

Do I Have to Pay Taxes on CD Interest?

CD interest is generally considered taxable income in the year it is credited or made available to you, even when you leave it in the account. Your bank may send you a Form 1099-INT when your interest meets applicable reporting requirements. Tax treatment can differ for CDs held within certain retirement accounts, so consult a qualified tax professional about your situation.

^‡ZYNLO Certificate of Deposit: There is no minimum deposit required to open this account. The minimum balance to obtain APY on Certificates of Deposit is $0.01. CD rates are fixed for the term of the account. Interest begins to accrue on the business day you deposit non-cash items (for example, checks). A penalty may be imposed for early withdrawal from a CD and is based on the maturity term and could reduce earnings. Transaction Limitations apply. Refer to the Important Terms and Conditions, Certificate of Deposit Accounts – Truth In Savings Disclosure for the early withdrawal penalties and additional information. Must be 18 or older to open an account. See current rates here.

How Does a Certificate of Deposit (CD) Work?