A certificate of deposit locks your money away for a set time in exchange for a fixed interest rate

A certificate of deposit (CD) is an account where you give a bank or credit union a sum of money and agree not to touch it for a specific period — anywhere from three months to five years or longer. In return, the bank pays you a fixed interest rate that is usually higher than what a regular savings account offers. When the time period ends, you get your original money back plus all the interest earned.

The trade-off is straightforward: you lose access to your cash for the duration of the CD term. If you withdraw the money early, the bank charges you a penalty, usually by deducting some of the interest you earned. This structure makes CDs useful for money you know you will not need soon and want to grow at a predictable rate.

Key Takeaways

  • You deposit a fixed amount of money for a fixed time period and receive a fixed interest rate that does not change.
  • The bank pays interest on top of your deposit, and you receive both when the CD matures at the end of the term.
  • Withdrawing money before the maturity date triggers an early withdrawal penalty, which reduces your earnings.
  • CD rates vary by bank, term length, and deposit amount, so comparing offers before opening one saves money.
  • CDs are insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000 per depositor per institution.

How the interest rate and term length work together

When you open a CD, you choose two things: how long to lock your money away and how much to deposit. The bank then tells you the interest rate you will earn for that specific term. A three-month CD might pay 4.5 percent annually, while a five-year CD at the same bank might pay 5.2 percent. Longer terms usually pay higher rates because the bank gets to hold your money for a longer time.

The interest compounds, meaning you earn interest on your interest. If you deposit $10,000 in a CD paying 5 percent annually for one year, you will have $10,500 at maturity. The exact amount depends on how often the bank compounds the interest — daily, monthly, or quarterly — which the bank discloses when you open the account. You do not have to do anything; the bank handles all the calculations and adds the interest to your account automatically.

What happens when your CD reaches maturity

On the maturity date, your CD term ends. The bank sends you a notice a few weeks before this happens, usually by mail or email. At that point, you have a choice: withdraw the money, or let the bank automatically renew the CD for another term at whatever the current rate is. Many banks renew automatically if you do not tell them otherwise, so check your notice carefully if you want to move the money somewhere else.

If you withdraw the money after maturity, there is no penalty. You get your full deposit plus all the interest earned. If you want to keep the money growing in a CD but shop for a better rate elsewhere, you can close the CD at maturity and open a new one at a different bank without any cost.

The early withdrawal penalty and when it applies

If you need your money before the maturity date, the bank will let you take it out, but you will pay a penalty. The penalty is usually a certain number of months of interest. A CD with a one-year term might have a penalty of three months of interest, meaning if you withdraw after six months, the bank subtracts three months of interest from what you would have earned and gives you the rest.

The exact penalty varies by bank and by CD term. Some banks charge a flat dollar amount; others charge a percentage of your deposit. Before you open a CD, ask the bank what the early withdrawal penalty is. Write it down. If you think there is any chance you might need the money, a CD with a shorter term or a lower penalty is a better choice than locking money away for five years.

How CD rates compare across banks and terms

CD rates change constantly because they follow broader interest rates set by the Federal Reserve. When the Fed raises rates, new CDs pay more. When the Fed lowers rates, new CDs pay less. A CD opened today at 5 percent will keep paying 5 percent for its entire term, even if rates drop to 3 percent next month. This is the benefit of a fixed rate: you know exactly what you will earn.

Different banks offer different rates for the same term length. A large national bank might pay 4.8 percent on a one-year CD, while an online bank might pay 5.1 percent for the same term. Over a year, that 0.3 percent difference adds up. Before opening a CD, check rates at several banks — national banks, credit unions, and online banks all compete for CD deposits. Websites that list CD rates from multiple institutions can help you compare quickly.

FDIC and NCUA insurance protects your deposit

Money in a CD at a bank is insured by the FDIC (Federal Deposit Insurance Corporation) up to $250,000 per depositor per bank. Money in a CD at a credit union is insured by the NCUA (National Credit Union Administration) up to the same amount. This means if the bank or credit union fails, the government guarantees you will get your money back, up to $250,000.

If you have more than $250,000 to deposit, you can open CDs at multiple banks or credit unions, and each account is insured separately. The insurance covers your deposit plus all the interest earned, so you do not lose money if the institution closes. This protection applies whether you withdraw at maturity or early — the insurance is about the safety of your money, not the terms of the CD.

When a CD makes sense for your situation

A CD works well if you have money you will not need for a known period of time and want a may provide return. If you are saving for a down payment on a house in two years, a two-year CD locks in a rate and keeps you from spending the money. If you have an emergency fund already in place and extra cash sitting in a low-interest savings account, moving some of it to a CD earns you more without adding risk.

A CD is less useful if you might need the money soon, if you want flexibility to move your money if rates rise, or if you are comfortable taking on investment risk for the possibility of higher returns. CDs are also not the best choice for money you plan to add to regularly — you cannot deposit more into an existing CD, so you would need to open a new one each time you have money to invest.

Frequently Asked Questions

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

No. A CD is a fixed deposit for a fixed term. Once you open it, you cannot add more money to that same CD. If you want to invest additional money, you would need to open a separate CD. Some banks offer CD ladders, where you open multiple CDs with different maturity dates, so money becomes available at different times.

What happens if I need my money before the CD matures?

You can withdraw it, but the bank charges an early withdrawal penalty. The penalty is usually several months of interest. For example, if your CD pays $500 in annual interest and the penalty is three months of interest, you lose $125. The bank deducts the penalty from your earnings before giving you the rest of your money.

Do I have to pay taxes on CD interest?

Yes. CD interest is taxable income. The bank sends you a 1099-INT form each year showing how much interest you earned. You report this on your tax return. The interest is taxed at your ordinary income tax rate, not at a lower capital gains rate, so CDs are most useful for money in tax-advantaged accounts like IRAs or for people in lower tax brackets.

Is a CD safer than a savings account?

Both are equally safe because both are FDIC-insured up to $250,000. The difference is the interest rate — CDs usually pay more because you agree not to touch the money. A savings account gives you flexibility; a CD gives you a higher rate in exchange for locking your money away.

What if rates go up after I open my CD?

Your CD keeps paying the rate you locked in when you opened it. If rates rise, new CDs will pay more, but yours will not change. This is the trade-off of a fixed rate: you are protected if rates fall, but you miss out if rates rise. Some banks offer no-penalty CDs that let you withdraw without a penalty if rates go up, though these usually pay slightly lower rates.