What happens when you open a CD

A CD (certificate of deposit) is an agreement between you and a bank or credit union: you give them a sum of money for a fixed period, and they pay you a set interest rate for the entire time. You cannot withdraw the money before that period ends without paying a penalty — usually a loss of some or all of the interest you would have earned, or a percentage of your principal.

When you open a CD, you choose the term length (how long your money stays locked). Common terms are 3 months, 6 months, 1 year, 2 years, 3 years, and 5 years. The longer the term, the higher the interest rate the bank typically offers you. At the end of the term, the CD matures. Your principal and all earned interest are yours to withdraw, or you can roll the money into a new CD at whatever rate is current at that moment.

The interest rate on a CD is fixed — it does not change during the term, even if the Federal Reserve raises or lowers rates. This is the main trade-off: you get certainty about your return, but you give up the chance to move your money if rates rise sharply.

Key Takeaways

  • You lock your money into a CD for a set term (3 months to 5 years are common) and receive a fixed interest rate that does not change.
  • Withdrawing money before the maturity date triggers an early withdrawal penalty, which typically costs you some or all of the interest earned.
  • The longer the term you choose, the higher the interest rate the bank will usually offer.
  • When your CD matures, you can withdraw your principal and interest, or automatically roll it into a new CD at the current rate.
  • CDs are FDIC-insured up to $250,000 per depositor per bank, making them a low-risk place to store money you will not need soon.

How the interest rate and term length work together

Banks use the current interest rate environment to set CD rates. When the Federal Reserve keeps rates high, banks offer higher CD rates to attract deposits. When rates fall, CD rates fall too. The term you choose affects the rate you get: a 6-month CD will pay less than a 2-year CD opened on the same day at the same bank, because the bank is locking in a rate for longer and taking on more risk that rates will rise.

Your interest compounds — meaning you earn interest on your interest — at intervals the bank sets (usually daily or monthly). A bank will tell you the annual percentage yield (APY), which shows you the total return you will earn in a year, accounting for compounding. This is the number to compare across banks and terms.

The interest is paid to you in different ways depending on the CD. Some banks add it to your account monthly or quarterly. Others hold it until maturity and pay it all at once. Ask the bank before you open the account if the timing matters to you.

What happens if you need the money before maturity

Early withdrawal penalties exist because the bank is counting on keeping your money for the full term. If you pull it out early, you break that agreement. The penalty amount varies by bank and term length. Some banks charge a flat fee (like $25). Others charge a percentage of the principal (like 1 percent) or a number of months' worth of interest (like 3 months of interest, even if you have only earned 1 month's worth).

The penalty can be large enough to wipe out all your interest and eat into your original deposit. For example, if you open a 1-year CD with $5,000 at 4.5 percent APY and withdraw after 3 months, you might have earned about $56 in interest — but the penalty could be $56 or more, leaving you with less than you started with. Before opening a CD, read the disclosure document the bank provides and ask directly what the penalty is.

Some banks offer no-penalty CDs, which let you withdraw without a penalty (though usually only after a short waiting period, like 7 days). These CDs pay lower interest rates than standard CDs because the bank is taking on more risk. They make sense if you are not sure you can leave the money untouched.

CD laddering: spreading your money across multiple terms

One way to balance the security of a fixed rate with access to your money is CD laddering. You divide your savings into several CDs with different maturity dates — for example, one 1-year CD, one 2-year CD, and one 3-year CD, each with the same amount. As each CD matures, you can withdraw the money, reinvest it in a new longer-term CD, or move it to a savings account if you need it.

Laddering gives you regular access points without forcing you to break a CD early. It also lets you take advantage of rate changes: if rates rise, you can reinvest maturing CDs at the new higher rate instead of being locked into an old low rate for years. If rates fall, you still have some money earning the higher rate you locked in earlier.

FDIC insurance and where your money is held

CDs opened at FDIC-insured banks or credit unions (NCUA-insured) are protected up to $250,000 per depositor per institution. This means if the bank fails, your money is safe up to that limit. The insurance covers the principal plus any interest earned up to the maturity date.

If you have more than $250,000 to save, you can open CDs at multiple banks to stay within the insurance limit at each one. For example, a $500,000 CD at Bank A and a $500,000 CD at Bank B are both fully insured, but a $500,000 CD at the same bank is only insured up to $250,000.

Your money sits in the bank's general account — you do not own a physical certificate (despite the name). The bank holds it and pays you interest according to the terms you agreed to.

How CD rates compare to savings accounts and other options

CDs typically pay more interest than regular savings accounts because you are giving up access to your money. A savings account lets you withdraw anytime without penalty, so banks pay less. Money market accounts fall somewhere in between: they offer higher rates than savings accounts but lower than CDs, and they usually let you write checks or make a limited number of withdrawals per month.

The rate difference varies by bank and by the interest rate environment. When rates are high, the gap between a CD and a savings account might be 0.5 percent or more. When rates are low, the difference might be 0.1 percent. Over time, that gap adds up: $10,000 earning 4.5 percent in a CD for 1 year earns about $450, while the same money in a 3.5 percent savings account earns about $350 — a difference of $100.

Bonds and Treasury securities also lock in a rate, but they work differently: you can sell them before maturity (though the price may have changed), and they are not FDIC-insured. CDs are simpler and safer if you want a may provide return with no market risk.

When to open a CD and what to watch for

Open a CD when you have money you will not need for the term length you choose, and when the rate environment is favorable. If the Federal Reserve has been raising rates and economists expect rates to stay high, locking in a rate now makes sense. If rates are expected to fall, a shorter-term CD lets you reinvest at a new rate sooner.

Before opening a CD, compare rates across at least three banks or credit unions. Online banks often pay higher rates than brick-and-mortar banks because they have lower overhead. Check the bank's FDIC insurance status and read the fine print on early withdrawal penalties. Some banks also offer promotional rates for new customers or for opening multiple products at once.

Watch the maturity date. Mark it on your calendar or set a reminder so you know when the CD matures and can decide whether to withdraw, reinvest, or roll it into a new CD. Some banks automatically roll your CD into a new one at the current rate if you do not tell them otherwise — which can lock you in again without you realizing it.

Frequently Asked Questions

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

No. A CD is a fixed agreement for a fixed amount. Once you open it, you cannot deposit more money into that CD. If you want to save more, you would need to open a separate CD or use a savings account.

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

A savings account lets you withdraw money anytime without penalty and usually pays lower interest. A CD locks your money for a set term and pays higher interest, but you lose money if you withdraw early. Choose a savings account if you might need the money soon, and a CD if you are confident you will not touch it.

Do I have to pay taxes on CD interest?

Yes. CD interest is taxable income in the year it is earned or paid to you, depending on how the bank handles it. The bank will send you a 1099-INT form at tax time showing how much interest you earned. This is true even if you did not withdraw the money.

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

If the bank is FDIC-insured, your CD is protected up to $250,000 including all interest earned. The FDIC will pay you the full amount, and your CD will mature on schedule or you can withdraw the money immediately. Check the bank's FDIC status before opening a CD.

Can I cash out a CD early if I have an emergency?

You can, but you will pay an early withdrawal penalty that usually costs more than the interest you have earned. Before opening a CD, decide whether you truly will not need the money. If there is any chance you might, consider a no-penalty CD or keep some money in a savings account instead.