What happens when you open a CD

A certificate of deposit is an agreement between you and a bank: you give the bank a lump sum of money, the bank holds it for a set period of time (called the term), and at the end of that term, the bank pays you back your original amount plus interest. You cannot touch the money during the term without paying a penalty.

When you open a CD, you choose how long to lock up your money. Banks typically offer terms of three months, six months, one year, two years, three years, or five years. The longer the term, the higher the interest rate the bank will pay you. A five-year CD pays more than a one-year CD because the bank gets to use your money for longer.

You must deposit a minimum amount to open a CD. This minimum varies by bank and by term—some banks require $500, others $1,000 or $2,500. A few banks have no minimum. The interest rate is locked in on the day you open the CD and does not change, even if the bank raises or lowers its rates later.

Key Takeaways

  • Your money is locked in for the full term; withdrawing early triggers a penalty that reduces your earnings or eats into your principal.
  • Interest rates are fixed when you open the CD and do not change, even if market rates move up or down.
  • At maturity, the bank automatically renews the CD at the current rate unless you tell it to stop, so you must act before the renewal date if you want to move your money.
  • CDs are insured by the FDIC up to $250,000 per depositor per bank, making them one of the safest places to keep money.
  • The longer the term, the higher the rate, but you give up access to your cash for that entire period.

How interest accrues and compounds

The bank pays you interest on your CD balance. How often that interest is added to your account depends on the bank—some compound daily, others monthly or quarterly. Compounding means the bank adds interest to your balance, and then calculates next period's interest on the larger amount, so you earn interest on your interest.

The interest rate is expressed as an annual percentage rate, or APY. This is the rate you will earn over one year if you hold the CD to maturity. If your CD has a one-year term and a 4.5% APY, you will earn 4.5% of your principal by the end of the year. If the term is six months, you earn half of that rate (roughly 2.25%), because you are holding the money for half the year.

You do not receive the interest as a separate payment. Instead, the bank adds it directly to your CD balance. When the CD matures, you receive the full amount—your original deposit plus all the interest earned.

What happens at maturity

When your CD term ends, the bank enters a grace period, usually seven to ten days. During this window, you can withdraw your money without penalty, move it to another bank, or do nothing. If you do nothing, most banks automatically renew the CD at the current interest rate for another term of the same length.

Automatic renewal is the trap many people miss. If you opened a two-year CD at 4.5% and rates have dropped to 2.5% by maturity, the bank will renew your CD at 2.5% unless you tell it to stop. You have only the grace period to act—once the renewal happens, you are locked in again at the lower rate, and early withdrawal means a penalty.

To avoid unwanted renewal, contact your bank before the grace period ends. You can ask them to hold the money in a regular savings account, transfer it to another bank, or let it sit without renewing. Some banks let you set renewal instructions online or by phone; others require a written request or a visit to a branch.

Early withdrawal penalties and how they work

If you need your money before the term ends, the bank will let you withdraw it, but you will pay a penalty. The penalty is a fixed number of months' worth of interest. A CD might have a penalty of three months' interest, six months' interest, or twelve months' interest—it depends on the bank and the term.

Here is how the math works: suppose you have a $10,000 CD earning 4% APY with a six-month penalty. If you withdraw after three months, the bank calculates six months of interest on $10,000 at 4% (which is $200) and subtracts that from your withdrawal. You receive $10,000 minus $200, or $9,800. If you have earned less than $200 in interest by the time you withdraw, the penalty eats into your principal—you get back less than you deposited.

Some banks offer no-penalty CDs that let you withdraw your money early without losing interest, though the rate on these CDs is usually lower than on standard CDs. These are worth considering if you think you might need access to the money.

FDIC insurance and safety

Money in a CD at an FDIC-insured bank is protected up to $250,000 per depositor per bank. This means if the bank fails, the federal government guarantees you will get your money back, up to that limit. The insurance covers your principal and any interest earned, so a $100,000 CD earning $4,000 in interest is fully covered.

If you have more than $250,000 to deposit, you can spread it across multiple banks to stay within the insurance limit at each one. You can also open CDs in different ownership categories at the same bank—for example, a CD in your name and a separate CD in your spouse's name—and each is insured separately up to $250,000.

CDs are among the safest places to keep money because they are insured and the bank cannot use your money for risky investments. The trade-off is that you earn less interest than you might in the stock market, and you cannot access your cash without a penalty.

Comparing CD rates and terms across banks

CD rates vary widely between banks and change frequently. A large national bank might offer 1.5% on a one-year CD while an online bank offers 4.5% on the same term. The difference comes down to how much the bank needs deposits and how much it costs them to operate. Online banks typically have lower overhead and can pass those savings to customers in the form of higher rates.

Before you open a CD, check rates at several banks. Use a rate-comparison website or call banks directly. Pay attention to the term length and the APY—a slightly longer term might earn you significantly more interest. Also check the minimum deposit and the early withdrawal penalty, because a low rate with no penalty might be better than a high rate with a steep penalty if you think you might need the money.

Interest rates on CDs are not negotiable. The bank sets the rate, and you either accept it or go elsewhere. Some banks offer promotional rates for new customers or for large deposits, so it is worth asking.

How CDs fit into a savings strategy

A CD is useful when you have money you will not need for a specific period of time 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 keeps you from spending the money. If you have an emergency fund that is already fully stocked, moving some of that money into a CD earns more interest than a regular savings account.

CDs are not useful if you might need the money soon, because the early withdrawal penalty will cost you. They are also not useful if you think interest rates will rise significantly, because you will be locked into a lower rate. In that case, a high-yield savings account gives you flexibility to move your money when rates improve.

Some people use a CD ladder—opening multiple CDs with different maturity dates so that one matures every few months or every year. This gives you regular access to some of your money while keeping the rest locked in at higher rates. For example, you might open a one-year, two-year, and three-year CD at the same time. When the one-year CD matures, you can renew it for three years, so you always have a three-year CD maturing in the future.

Frequently Asked Questions

Can I withdraw money from a CD before it matures?

Yes, but you will pay an early withdrawal penalty set by the bank. The penalty is usually three to twelve months of interest. If you have not earned enough interest yet, the penalty comes out of your principal, and you get back less than you deposited. Some banks offer no-penalty CDs that let you withdraw without losing interest, though the rate is typically lower.

What is the difference between a CD and a savings account?

A savings account has no term—you can withdraw money anytime without penalty. A CD locks your money in for a set period and pays a higher interest rate in exchange. Savings accounts are more flexible; CDs pay more interest. Both are FDIC-insured up to $250,000.

What happens if the bank fails while my CD is open?

The FDIC insures your CD up to $250,000, so you will get your money back even if the bank fails. The insurance covers your principal and all interest earned. This protection applies only at FDIC-insured banks, so check the bank's status before you open a CD.

Do I have to renew my CD when it matures?

No. Most banks automatically renew unless you tell them to stop during the grace period (usually seven to ten days after maturity). You can withdraw the money, move it to another bank, or ask the bank to hold it in a regular account. Contact your bank before the grace period ends to prevent unwanted renewal.

Is the interest I earn on a CD taxable?

Yes. The interest you earn is taxable income in the year it is paid, even if you do not withdraw the money. The bank will send you a 1099-INT form showing the interest earned. If you are in a high tax bracket, the after-tax return on a CD might be lower than you expect.