A Certificate of Deposit Is a Savings Account That Locks Your Money Away for a Set Time

A certificate of deposit, or CD, is an account at a bank or credit union where you deposit money and agree to leave it untouched for a fixed period — usually three months to five years. In exchange, the bank pays you a higher interest rate than a regular savings account would. When the time period ends, you get your original deposit back plus the interest earned.

The trade-off is straightforward: you give up access to your money for a while, and the bank rewards you with better returns. If you withdraw the money before the term ends, you pay a penalty — usually a few months' worth of interest. This makes CDs useful for money you know you will not need soon but want to earn something on.

Key Takeaways

  • A CD locks your money for a set term (three months to five years) in exchange for a higher interest rate than a savings account offers.
  • You receive your full deposit plus earned interest when the term ends, as long as you do not withdraw early.
  • Withdrawing before the term ends costs you a penalty, usually several months of interest.
  • CD rates change based on the overall interest rate environment and the length of the term you choose.
  • Banks and credit unions both offer CDs, and rates vary widely between institutions.

How Interest Rates and Terms Work on CDs

The interest rate a bank offers on a CD depends on two main things: the current interest rate environment set by the Federal Reserve, and how long you agree to lock your money away. Longer terms usually come with higher rates. A one-year CD might pay 4.5 percent, while a five-year CD at the same bank might pay 5.2 percent.

The rate is fixed when you open the CD, so you know exactly how much you will earn. If rates rise after you buy a CD, your rate does not change. If rates fall, you are locked in at the better rate. This certainty is one reason people use CDs — there are no surprises about what you will have at the end.

Interest compounds based on the bank's rules. Some CDs compound daily, others monthly or quarterly. More frequent compounding means slightly more money in your pocket, though the difference is usually small.

What Happens When Your CD Term Ends

When your CD reaches its maturity date, the bank notifies you and gives you a window — usually seven to ten days — to decide what to do with the money. You can withdraw it, move it to another account, or roll it into a new CD at whatever rate the bank is offering at that time.

If you do nothing during that window, many banks automatically roll your CD into a new one at the current rate. Read the fine print on your CD agreement to see what your bank does. If rates have dropped significantly, you may want to withdraw the money and move it elsewhere rather than accept a lower rate.

The Penalty for Withdrawing Early

If you need your money before the term ends, you can withdraw it, but the bank charges an early withdrawal penalty. This penalty is usually stated as a number of months of interest. A CD with a three-month penalty means you lose three months' worth of the interest you would have earned.

On a small CD or a short-term CD, this penalty might be just a few dollars. On a large CD or a long-term one, it could be hundreds. Before you open a CD, calculate what the penalty would be if you had to withdraw early, so you know the real cost of changing your mind.

Some banks offer "no-penalty CDs" that let you withdraw without a penalty, but they pay lower interest rates in exchange. These are useful if you think you might need the money but want better returns than a savings account.

CDs at Banks Versus Credit Unions

Both banks and credit unions offer CDs, and the mechanics are the same. The main differences are in rates and insurance coverage. Credit unions are member-owned nonprofits and sometimes offer slightly higher rates than banks, though not always. Shop around — rates vary widely.

Both bank CDs and credit union CDs are insured up to $250,000 per depositor, per institution, by the FDIC (for banks) or NCUA (for credit unions). If you have more than $250,000 to deposit, you can open CDs at multiple institutions to keep all your money insured.

When a CD Makes Sense for Your Money

A CD works well if you have money sitting in a low-interest savings account and you know you will not need it for at least several months. The higher rate means your money grows faster than it would in a regular account. It also works if you want to lock in a good rate before rates fall — you get certainty and a return.

A CD does not make sense if you might need the money soon. The early withdrawal penalty can wipe out the interest gain. It also does not make sense if you are trying to beat inflation — CD rates are usually modest, and if inflation is high, your money loses purchasing power even with the interest.

CDs also do not make sense as an emergency fund. Your money is not accessible without a penalty, so keep emergency savings in a regular savings account or money market account instead.

How to Compare CDs at Different Banks

When you are ready to open a CD, compare rates across several banks and credit unions. Online banks often offer higher rates than brick-and-mortar banks because they have lower overhead. Check the rate, the term length, the compounding frequency, and the early withdrawal penalty.

Calculate the total amount you will have at maturity using the bank's rate and compounding method. A difference of 0.5 percent might not sound like much, but on a $10,000 CD over five years, it adds up to hundreds of dollars. Use online CD calculators to see the difference.

Also check whether the bank or credit union is FDIC or NCUA insured. This protects your deposit if the institution fails, though that is rare.

Frequently Asked Questions

Can I add more money to a CD after I open it?

No. A CD is a fixed deposit. Once you open it, you cannot add to it. If you want to deposit more money, you open a separate CD. Some banks let you open multiple CDs at different terms so your money matures at different times.

What happens if the bank fails while I have a CD?

Your deposit is insured up to $250,000 by the FDIC (banks) or NCUA (credit unions). If the bank fails, the insuring agency pays you your deposit plus accrued interest. This protection is automatic — you do not have to do anything.

Is a CD a good way to save for a down payment?

Only if you know exactly when you will need the money and the CD term matches that date. If you need the money before the CD matures, the early withdrawal penalty will reduce what you have. A regular savings account is safer if the timing is uncertain.

Do I have to pay taxes on CD interest?

Yes. CD interest is taxable income in the year you earn it. The bank sends you a 1099-INT form at tax time showing how much interest you earned. This is true even if you do not withdraw the money yet.

What is the difference between a CD and a money market account?

A money market account lets you withdraw money anytime without a penalty, but it pays a lower interest rate. A CD locks your money for a set term and pays more interest. Choose based on whether you need access to the money.