A CD is a savings account where you agree to lock up your money for a set time in exchange for a higher interest rate
A certificate of deposit (CD) is a contract between you and a bank or credit union. You give them a lump sum of money, they promise to pay you a fixed interest rate, and you agree not to touch that money until a specific date — called the maturity date. In return for that commitment, the bank pays you more interest than it would on a regular savings account.
The trade-off is simple: you lose access to your money for the duration of the CD term. If you need the money before the maturity date, you can withdraw it, but you will pay a early withdrawal penalty — usually a few months' worth of the interest you would have earned. That penalty is the cost of breaking the agreement.
CDs come in different lengths. You might buy a 3-month CD, a 1-year CD, a 5-year CD, or anything in between. The longer the term, the higher the interest rate the bank typically offers, because they get to hold your money for longer.
Key Takeaways
- A CD locks your money away for a set period (3 months to 5 years or longer) in exchange for a may provide interest rate higher than a savings account.
- You pay an early withdrawal penalty if you take your money out before the maturity date, which usually costs you several months of interest.
- The interest rate on a CD is fixed when you buy it, so it does not change even if market rates rise or fall.
- When your CD reaches maturity, you can withdraw your money and interest, buy a new CD, or let it roll over into another CD at the bank's current rate.
How the interest rate works on a CD
When you open a CD, the bank tells you the annual percentage yield (APY) — the rate of interest you will earn over one year. That rate is locked in for the entire term. If you buy a 2-year CD at 4.5% APY, you will earn 4.5% per year for both years, even if interest rates in the economy drop to 2%.
The interest compounds, usually monthly or daily depending on the bank. That means you earn interest on your interest. A $10,000 CD at 4.5% APY for one year will grow to $10,450 — the $450 is your interest. If you let that $10,450 sit in another CD at the same rate for a second year, you earn interest on the full $10,450, not just the original $10,000.
The bank calculates your total interest and adds it to your account on the maturity date. You then have the money available to withdraw or reinvest.
What happens when your CD matures
On the maturity date, you have three choices. First, you can withdraw the full amount — your original deposit plus all the interest you earned. Second, you can open a new CD with that money at whatever rate the bank is currently offering. Third, you can do nothing, and the bank will automatically roll the CD over into a new one at the current rate.
That third option — the automatic rollover — is important to watch. If you do not want to renew, you need to contact the bank before the maturity date and tell them. Otherwise, your money locks up again for another term at whatever rate they are offering at that moment. If rates have dropped, you might end up in a CD earning much less than you expected.
Most banks give you a grace period of 7 to 10 days after maturity during which you can withdraw your money without penalty. After that window closes, the new CD term begins and early withdrawal penalties apply again.
Early withdrawal penalties and when they apply
If you need your money before the maturity date, you can get it — but the bank will subtract a penalty. The penalty amount varies by bank and by CD term. A 3-month CD might have a penalty of one month's interest. A 5-year CD might have a penalty of six months' interest or more.
The penalty comes out of your interest earnings first. If you have earned $500 in interest and the penalty is $300, you get your original deposit back plus $200. If the penalty is larger than your interest, it comes out of your principal — your original deposit.
Some banks offer no-penalty CDs, which let you withdraw your money early without a penalty, though the interest rate is usually lower than a standard CD. These are useful if you think you might need the money but want a rate better than a savings account.
CDs versus savings accounts: the main differences
A savings account has no maturity date and no penalty for withdrawal. You can add money or take money out whenever you want. In exchange, the interest rate is lower — often much lower. A high-yield savings account might pay 4% to 5% APY right now, but a regular savings account at many large banks pays less than 0.5%.
A CD pays more interest because you commit to leaving the money untouched. The bank knows exactly how long it will have your money, so it can lend it out or invest it with confidence. That certainty is worth paying you more for.
The downside is that your money is not available if an emergency happens. If you withdraw early, you lose interest and pay a penalty. This makes CDs better for money you know you will not need for a specific period — like a down payment you are saving for over the next two years, or a lump sum you want to set aside for a specific goal.
How to choose a CD term that fits your timeline
The term you choose should match when you actually need the money. If you are saving for a house down payment in three years, a 3-year CD makes sense. If you are setting aside an emergency fund, a CD is probably the wrong tool because you might need that money unpredictably.
Longer-term CDs usually pay higher rates than shorter ones. A 1-year CD might pay 4% APY, while a 5-year CD might pay 4.8% APY. The extra 0.8% is the bank's way of compensating you for locking up your money longer. But that higher rate only helps you if you actually leave the money alone for the full five years. If you withdraw early, the penalty will eat into your gains.
Some people use a strategy called CD laddering: they buy multiple CDs with different maturity dates. For example, you might buy five 1-year CDs, each maturing in consecutive years. As each one matures, you can reinvest it or use the money. This gives you some access to your money while still earning CD rates on the rest.
Where to buy a CD and what to compare
You can buy CDs from banks, credit unions, and online financial institutions. Online banks often pay higher rates than brick-and-mortar banks because they have lower overhead costs. Credit unions sometimes offer competitive rates to their members.
When comparing CDs, look at the APY, the term length, and the early withdrawal penalty. A CD paying 4.8% APY with a 6-month penalty is different from one paying 4.5% APY with a 1-month penalty. Calculate what you would actually receive if you had to withdraw early, not just the headline rate.
Also check whether the bank is FDIC-insured (for banks) or NCUA-insured (for credit unions). This insurance protects your deposit up to $250,000 if the institution fails. Most CDs are insured, but it is worth confirming.
Frequently Asked Questions
Can I add money to a CD after I open it?
No. A CD is a fixed contract. You deposit a lump sum on the day you open it, and that amount stays the same until maturity. If you want to save more money, you open a separate CD or use a savings account. Some banks offer add-on CDs, but these are rare and usually only available at the time of purchase.
What happens to my CD if the bank fails?
If the bank is FDIC-insured, your CD is protected up to $250,000. The FDIC will pay you your full deposit plus accrued interest. If you have more than $250,000 in CDs at the same bank, only $250,000 is covered. Spreading CDs across multiple banks protects larger amounts.
Is the interest rate on a CD may provide?
Yes. Once you buy the CD, the rate is locked in for the entire term. It will not change if market rates go up or down. This is different from a variable-rate savings account, where the bank can lower the rate whenever it wants.
What is the difference between a CD and a bond?
Both lock up your money for a set time and pay interest, but bonds are issued by governments or companies and traded on a market. You can sell a bond before maturity, though the price may be higher or lower than you paid. CDs are not traded — you either hold them to maturity or withdraw early and pay a penalty.
Can I use a CD as part of an emergency fund?
A CD is not ideal for emergency money because you will pay a penalty to access it early. A high-yield savings account is better for emergencies because you can withdraw without penalty. You could use a short-term CD (3 or 6 months) as part of a layered savings strategy, but keep your true emergency fund in an account with no restrictions.