A CD is a savings account where you lock money away for a set time in exchange for a higher interest rate

A certificate of deposit (CD) is an account at a bank or credit union where you deposit money and agree not to touch it until a specific date. In return, the bank pays you a fixed interest rate — usually higher than a regular savings account offers. When the CD reaches its maturity date, you get your original deposit back plus all the interest earned.

The trade-off is straightforward: you give up access to your money for a defined period (typically three months to five years), and the bank gives you a better rate. If you withdraw the money before the maturity date, you pay a penalty — usually a certain number of months' worth of interest. The longer you agree to lock the money away, the higher the interest rate typically is.

Key Takeaways

  • You deposit a lump sum into a CD and cannot withdraw it without penalty until the maturity date arrives, which can range from three months to five years or longer.
  • The interest rate on a CD is fixed when you open it, so you know exactly how much you will earn regardless of whether market rates rise or fall.
  • Early withdrawal penalties vary by bank and CD term — some charge three months of interest, others charge six months or a percentage of your deposit.
  • When a CD matures, you can withdraw the money, move it to a new CD, or let it automatically renew at the bank's current rate for the same term.
  • CDs are FDIC-insured at most banks up to $250,000 per account, so your deposit is protected even if the bank fails.

How the interest rate and term length work together

Banks set CD rates based on how long you agree to lock your money away. A three-month CD might pay 4.5 percent annually, while a two-year CD at the same bank might pay 5.2 percent. The longer the commitment, the higher the rate — though this is not a rule carved in stone. When interest rates in the broader economy are falling, banks sometimes offer lower rates on longer terms.

The interest rate is fixed, meaning it does not change. If you open a one-year CD at 5 percent and the bank's rates drop to 3 percent three months later, you still earn 5 percent for the full year. This cuts both ways: if rates rise to 6 percent, you are locked in at 5 percent.

Interest compounds on a schedule the bank sets — daily, monthly, or quarterly. More frequent compounding means you earn slightly more, because interest gets added to your balance and then earns interest itself. The difference is usually small, but it adds up over longer terms.

What happens if you need the money before maturity

Withdrawing money early from a CD triggers a penalty, which the bank deducts from your balance. The penalty amount varies widely. Some banks charge three months of interest; others charge six months or a full year's worth. A few charge a percentage of your deposit — typically 1 to 3 percent. Read the CD's terms before you open it, because penalties differ even within the same bank.

The penalty is calculated based on the interest rate you locked in, not the current rate. If you opened a CD at 5 percent and withdraw early, the bank calculates the penalty using that 5 percent rate. The penalty comes out of your balance, so you might get back less than you deposited if the penalty is large enough and you have not earned much interest yet.

Some banks offer no-penalty CDs, which let you withdraw without a penalty after a short waiting period (usually seven to ten days). These come with lower interest rates to offset the bank's risk. They make sense if you think you might need the money but want better returns than a savings account.

What maturity means and what your options are

The maturity date is the day your CD term ends. On that date, your money is no longer locked away. You can withdraw it, open a new CD, or do nothing and let the bank automatically renew it.

If you do nothing, most banks automatically roll your CD into a new one with the same term at their current rate. This happens within a few days of maturity. If rates have dropped, your new CD will pay less. If rates have risen, you might wish you had shopped around. Banks typically give you a grace period — usually five to ten days after maturity — to withdraw the money or move it elsewhere without penalty.

Some people use a CD ladder to manage this: they open multiple CDs with different maturity dates (one matures in six months, one in a year, one in 18 months, and so on). This way, money becomes available at regular intervals without locking everything away for years. When each CD matures, you can decide whether to renew it or use the money.

How CD rates compare across banks and what affects them

CD rates vary significantly between banks. A large national bank might offer 4.0 percent on a one-year CD, while an online bank or credit union offers 5.1 percent for the same term. The difference comes down to how banks fund themselves. Online banks have lower overhead costs and often offer higher rates to attract deposits. Credit unions sometimes offer better rates to members. Large banks with many branches often pay less because they do not need to compete as hard for deposits.

Broader economic conditions also shape CD rates. When the Federal Reserve raises its benchmark interest rate, banks typically raise CD rates within weeks. When the Fed cuts rates, CD rates fall. This is why shopping around matters: the best rate today might be 5.2 percent, but in six months it could be 4.5 percent. If you think rates are about to drop, locking in a longer term makes sense. If you think rates will rise, a shorter term lets you reinvest at a higher rate sooner.

FDIC insurance and what it protects

Most CDs at banks are covered by FDIC insurance, which protects your deposit up to $250,000 per account at each bank. If the bank fails, the FDIC reimburses you for the full amount (up to the limit). This makes CDs one of the safest places to put money.

The $250,000 limit applies per depositor, per bank, per account type. If you have a CD in your name and another CD in a joint account with your spouse at the same bank, each is insured separately up to $250,000. If you have $300,000 to deposit, you could split it across two banks ($250,000 at each) and be fully covered.

Credit unions offer similar protection through the National Credit Union Administration (NCUA), also up to $250,000 per account. Money market funds and brokerage CDs are not FDIC-insured, so check where your CD is held before you open it.

When a CD makes sense and when it does not

A CD works well if you have money you will not need for a specific period and you want a may provide return. If you are saving for a down payment in two years, a two-year CD locks in a rate and removes the temptation to spend the money. If you have an emergency fund already in place and extra cash sitting in a low-yield savings account, moving some of it to a CD can earn you more.

A CD does not make sense if you might need the money before maturity and early withdrawal penalties would eat into your gains. It also does not make sense if you believe interest rates will rise significantly and you want flexibility to move your money to a higher-paying account. In a rising-rate environment, shorter-term CDs (three to six months) let you reinvest more frequently at better rates.

If you are uncertain about when you will need the money, a high-yield savings account offers nearly the same rate as a short-term CD with no penalty for withdrawal. The trade-off is that savings account rates can change at any time, while CD rates are locked in.

Frequently Asked Questions

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

No. A CD is a fixed deposit — you choose the amount when you open it, and you cannot add to it. If you want to deposit more money, you must open a separate CD. Some banks let you open multiple CDs at once with different amounts.

What happens to my CD if the bank gets bought by another bank?

Your CD stays intact. The acquiring bank must honor the terms you agreed to, including the interest rate and maturity date. Your FDIC coverage transfers to the new bank as well. You will receive notice of the change, but no action is required on your part.

Is the interest I earn on a CD taxable?

Yes. CD interest is taxable income in the year it is earned, even if you do not withdraw the money. The bank will send you a 1099-INT form at tax time showing how much interest you earned. This applies whether the CD is in a regular account or a retirement account like an IRA.

Can I use a CD as collateral for a loan?

Yes. Some banks let you borrow against a CD at a lower interest rate than an unsecured loan. The bank holds the CD as collateral, so if you do not repay the loan, they keep the CD. This is sometimes called a CD-secured loan.

What is the shortest CD term available?

Most banks offer three-month CDs as their shortest term, though some offer one-month or even weekly CDs. Shorter terms pay lower interest rates. Online banks and credit unions sometimes have more variety in term lengths than large national banks.