What Is a CD? A Complete Beginner’s Guide to Certificates of Deposit

A CD, or certificate of deposit, is a savings account with a deal attached. You promise to leave your money alone for a set time, and the bank promises you a set interest rate. It's a good fit for money you won't need until a known date, but a poor home for your emergency fund.

1. What is a certificate of deposit?

When you open a CD, you put in a lump sum of money and agree to leave it there for a set amount of time, called the term. A term can be a few months or several years. In return, the bank pays you a set rate of interest. That's money the bank pays you for keeping your cash there.

When the term ends, you get your money back plus the interest. The catch is that if you take the money out early, the bank usually charges a fee called an early-withdrawal penalty.

Unlike stocks, a CD's rate is set the day you open it. Your balance won't go down because the market did.

Here's when a CD fits. Tara has $5,000 saved for a used car she plans to buy next fall. She's sure she won't need it before then. A 12-month CD can earn her more than a regular savings account, and the money is out of sight, so she isn't tempted.

But if that $5,000 were her emergency fund, a CD would be the wrong home. Emergencies don't wait for a term to end.

At a credit union, a CD is often called a share certificate, and it works the same way.

2. How a CD works

You pick a bank or credit union, choose a term and put in your money. Most CDs don't let you add more after you open them, though a few do, so check.

Three key terms to know:

Opening deposit: how much you put in. Many CDs have a minimum, like $500 or $1,000.
Term: how long the CD lasts, like six months, one year or five years.
Maturity date: the day the term ends. On that day you can take your money out with no penalty.

With a fixed-rate CD, your rate stays the same until the CD ends. Most CDs work this way. A few other types exist:

Bump-up CD: lets you switch to a higher rate once if the bank's rates rise.
Step-up CD: raises your rate on a set schedule.
No-penalty CD: lets you take your money out early with no fee, usually after the first week. It often pays a bit less.

Some CDs pay interest into your checking account. Others add it to the CD so it earns more interest.

3. APY: the number to compare

Banks show a CD's rate as an annual percentage yield (APY). APY is what your money earns in one year, counting compound interest, which just means interest that earns interest of its own. Because APY counts it, it's the fairest number for comparing offers.

Here's a simple example with a 4.00% APY:

One-year CD example	Amount
Starting deposit	$5,000
APY (example rate)	4.00%
Interest after one year	$200
Ending balance	$5,200

That's an example rate, not a quote. Rates change over time. The Federal Reserve held its benchmark rate steady in late October 2026, so check today's CD rates against the best high-yield savings rates before you lock in.

Watch for promo rates. A big number in an ad may need a large deposit, a new account or an odd term, like 7 months.

4. What if you need the money early?

Most banks charge a set number of months of interest. For example, many charge about three months' interest on a one-year CD and more on longer CDs, but that's a common habit, not a law. Federal rules only require a penalty of at least seven days' simple interest if you withdraw in the first six days. Past that, each bank picks its own penalty, so read yours before you open.

If you cash out early, the penalty can be more than the interest you've earned. Then it comes out of your principal, the money you put in.

Here's how that plays out. Ana puts $10,000 in a one-year CD at 4%. Her penalty is three months' interest, about $100.

If she cashes out after one month, she has earned only about $33. The $100 penalty takes all $33 plus $67 of her own money. She walks away with about $9,933.
If she waits six months, she has earned about $200. She pays the $100 penalty and keeps $100 of interest.

Before you open a CD, ask three questions. Can I take money out early at all? Can I take out just part of it? What is the exact penalty?

5. What happens when a CD ends?

On the maturity date, you can take the money, move it or start a new CD. Many CDs renew automatically. That means the bank rolls your money into a new CD of the same length unless you tell it otherwise. The new CD gets whatever rate the bank pays that day, which may be lower.

Most banks give you a grace period, often about a week after the CD ends. During it, you can take your money out with no penalty. Before the CD matures, your bank must send a notice that says when it ends and whether it renews. Check it for the exact dates.

Say your one-year CD ends on June 15 and you miss the grace period. Your money could be locked up for another year. To avoid that, set a reminder a few weeks ahead, compare rates, and tell the bank your plan.

6. What is a CD ladder?

A CD ladder splits your money into several CDs that end at different times, and each one is a "rung." You get some money back regularly, and you're not betting everything on one rate.

Diego has $12,000 he won't need for three years. He splits it into three $4,000 CDs with these example rates:

Rung	Rate	Interest earned
1-year CD	3.9%	About $156
2-year CD	3.8%	About $310 over two years
3-year CD	3.7%	About $461 over three years

Each year, one CD comes due. Diego can use that money or roll it into a new three-year CD. If he keeps rolling them over, he soon has three three-year CDs, with one ending every year.

A ladder doesn't promise higher earnings. It gives you a mix of steady access and locked-in rates.

7. Are CDs safe?

Yes, at an insured bank or credit union. Deposit insurance is government protection that pays you back if your bank fails. The FDIC (Federal Deposit Insurance Corporation) insures banks. The NCUA (National Credit Union Administration) insures credit unions, including share certificates.

The limit is $250,000 per person, per bank, per ownership category. An ownership category is how an account is titled. All your accounts in your name alone at one bank are added together. That includes checking, savings and CDs. That total is covered up to $250,000.

Other titles get their own coverage at the same bank:

Joint accounts. Each co-owner's share is insured up to $250,000. A joint CD for two people is covered up to $500,000.
Payable-on-death (POD) accounts. A POD account names who gets the money when you die. It is insured up to $250,000 for each beneficiary you name, up to $1,250,000 per owner.

Say Maria has a $200,000 CD in her name alone and a $300,000 joint CD with her husband at the same bank. Her solo CD is under $250,000. The joint CD is under $500,000. All $500,000 is insured.

Deposit insurance protects you from bank failure. It does not cancel early-withdrawal penalties.

Special types of CDs

Brokered CD: a CD you buy through an investment account instead of directly from a bank. It's still FDIC-insured if the bank that issues it is insured. The risk is price. If you sell early, you may get less than you paid.
Callable CD: a CD the bank can end early, usually when rates fall. You get your money back, but you lose the higher rate.
Market-linked CD: a CD whose return depends on a stock index. The rules are complex, and you may earn little or nothing.

You can check whether a bank is insured with FDIC BankFind, the FDIC's free search tool.

8. Do you pay taxes on CD interest?

Yes. The IRS taxes CD interest as ordinary income, which means it's taxed at your regular rate, like wages. You owe tax on it even if you leave the interest in the CD.

Your bank sends Form 1099-INT if it paid you $10 or more in interest that year. Smaller amounts are still taxable. With a CD longer than one year, you usually owe tax on the interest it earns each year, even before the CD ends. For those, the bank may send Form 1099-OID instead.

Your marginal tax rate is the rate on your next dollar of income, not on all of it. Say Tara earns $200 of CD interest and is in the 22% federal bracket. She owes about $44 in federal tax and keeps $156.

Good news if you paid a penalty: your 1099-INT shows it in box 2. You can subtract it from your income on your tax return, even if you take the standard deduction.

9. CD vs. high-yield savings vs. Treasury bills

A high-yield savings account (HYSA) is a savings account that pays much more than a typical one. You can move money out anytime. A Treasury bill (T-bill) is a short-term IOU from the U.S. government. You buy it for less than its face value and get the full amount back when it ends. Terms run from a few weeks to one year. You can buy T-bills at TreasuryDirect.gov or through a brokerage account.

Feature	Bank CD	High-yield savings	Treasury bill
Best for	Money with a set date	Cash you may need anytime	Short-term cash, up to one year
Rate	Usually fixed for the term	Variable	Fixed when you buy
Getting money early	Penalty	Anytime, 1–3 business days	Sell through a broker at market price
Protection	FDIC or NCUA insurance	FDIC or NCUA insurance	Backed by the U.S. government
Federal tax	Yes	Yes	Yes
State and local tax	Yes	Yes	No

If you live in New York

T-bill interest is taxed by the IRS but not by any state or city. New York has both a state income tax and, in New York City, a city income tax, so a T-bill can leave you with more than a CD that pays a slightly higher rate.

Kim lives in New York City. She compares a 4.00% CD with a 3.90% T-bill. In this example, her state and city tax on extra income adds up to about 10%. After those taxes, the CD keeps about 3.60%. The T-bill keeps the full 3.90%. The T-bill wins. Both still owe federal tax.

10. When a CD makes sense, and when it doesn't

A CD fits money you'll need on a known date, as long as the CD ends first. Good examples are part of a home down payment, next year's tuition, or a wedding fund.

A CD is a poor fit for your whole emergency fund or money you might need any day.

There's also rate risk both ways. If you lock in for five years and rates go up, you're stuck with the lower rate. If you pick six months and rates go down, you'll renew at less. Nobody knows which way rates will go, so many people split the difference with a ladder.

11. How to compare and open a CD

Name the goal. Write down when you'll need the money.
Keep emergency cash elsewhere. Don't lock up money for rent or surprises.
Check the bank. Look it up on FDIC BankFind, or check the NCUA for a credit union.
Compare APY and term together. A slightly higher rate may not be worth locking up money much longer.
Read the penalty. Get the exact formula, and ask about partial withdrawals.
Check the renewal rules. Find the grace period and how to give instructions.
Open and fund it. Save the agreement, rate, term and maturity date.
Set two reminders. One a few weeks before maturity, and one during the grace period.

Common CD mistakes

Picking the top rate without checking the term. The best rate may lock your money up too long.
Locking up your emergency fund. A penalty can make a bad week worse.
Letting a CD renew without looking. The new rate may be much lower.
Thinking each CD gets its own $250,000. All your solo accounts at one bank share one limit.
Forgetting taxes. You owe tax on interest each year, even if it stays in the CD.
Treating a brokered CD like a bank CD. Selling one early can mean getting back less than you paid.

Frequently asked questions

Can I lose money in a CD?

Not from a bank failure, if you're within the insurance limit. You can lose some principal by paying a penalty early, or by selling a brokered CD for less than you paid.

Can I add money each month?

Most CDs don't allow it. A few "add-on" CDs do, so check before you open.

Is a five-year CD better than a one-year CD?

Not always. A longer CD locks in a rate for longer, but it also locks up your money. Compare the dollars you'd earn, when you'll need the money and the penalty.

Can I have more than one CD?

Yes. That's exactly how a CD ladder works.

Is a CD the same as a retirement account?

No. A CD is a type of savings account. An IRA (individual retirement account) is a tax-friendly "container" for retirement savings. It can hold CDs, stocks or funds.

What happens to a CD if the owner dies?

The money goes to the named payable-on-death beneficiary or to the owner's estate. Many banks waive the early-withdrawal penalty in this case. Check your bank's terms.

The bottom line

A CD is a solid home for money with a clear deadline. You trade some flexibility for a locked-in rate. Pick a term that ends before you need the cash, know your penalty, and set a reminder before it renews.

Official sources and further reading

Convivial Wealth education guide · General education for U.S. readers, not personalized financial or tax advice. Rates shown are examples, and tax rules are reviewed each year.

Read our full educational disclaimer.