A Certificate of Deposit is a savings account where you lock up your money for a set time in exchange for a higher interest rate

A Certificate of Deposit (CD) is an agreement between you and a bank or credit union. You give them a lump sum of money, they hold it untouched for a period you both agree on — typically three months to five years — and in return they pay you a fixed interest rate that's higher than what a regular savings account offers. When the time is up, you get your original money back plus the interest earned.

The trade-off is simple: you lose access to that money during the term. If you withdraw before the end date, the bank charges you a penalty, usually by taking some or all of the interest you've earned. This penalty structure is what makes the bank willing to pay you more — they know your money will stay put.

CDs are insured by the Federal Deposit Insurance Corporation (FDIC) if held at a bank, or by the National Credit Union Administration (NCUA) if held at a credit union, up to $250,000 per account. That means if the bank fails, your money is protected.

Key Takeaways

  • You deposit a fixed amount of money and agree not to touch it for a set term, typically ranging from three months to five years.
  • The bank pays you a fixed interest rate that is higher than regular savings accounts because your money is locked in.
  • Withdrawing early triggers a penalty that usually reduces or eliminates the interest you've earned, sometimes costing you principal as well.
  • Your deposit is insured up to $250,000 by the FDIC (banks) or NCUA (credit unions), so your money is protected if the institution fails.
  • When the CD matures, you can withdraw the money, roll it into a new CD, or move it elsewhere without penalty.

How the interest rate and term length work together

The longer you lock your money away, the higher the interest rate typically is. A three-month CD might pay 4.5 percent, while a five-year CD from the same bank might pay 5.2 percent. The bank is compensating you for giving up access to your cash for longer. However, this relationship is not may provide — rates depend on what the Federal Reserve is doing and what the bank needs at that moment.

The interest rate is fixed for the entire term. If you buy a one-year CD at 5 percent and interest rates drop to 2 percent the next month, you still earn 5 percent. Conversely, if rates climb to 7 percent, you're locked in at 5 percent. This is why timing matters: buying a CD when rates are high locks in that advantage, but buying when rates are about to rise costs you.

Interest compounds on a schedule the bank sets — usually daily or monthly. That means you earn interest on your interest, which adds up over time. A $10,000 CD at 5 percent compounded daily will earn slightly more than one compounded monthly, though the difference is small.

What happens when your CD reaches maturity

When the term ends, the CD reaches maturity. At that point, you have options. You can withdraw the full amount (principal plus interest) without penalty. You can roll the money into a new CD at whatever rate the bank is offering at that time. Or you can move the money to a different bank or account type entirely.

Most banks have a grace period — usually seven to ten days — after maturity during which you can make a decision without the money automatically rolling into a new CD. If you do nothing during that window, many banks will automatically renew your CD at the current rate for the same term length. Read your CD agreement to know your bank's specific policy, because some institutions renew immediately with no grace period.

If you miss the grace period and the CD has already renewed, you can still withdraw without penalty during the first few days of the new term at some banks, though this varies. Contact your bank to understand their renewal and withdrawal rules before you buy.

Early withdrawal penalties and how they're calculated

If you need your money before the CD matures, you can withdraw it, but the bank will charge a penalty. The 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 $10,000 CD earning 5 percent annually, that's roughly $125 in lost interest.

The penalty can be steep enough to eat into your principal if you withdraw very early. For example, if you buy a five-year CD and withdraw after two months, the penalty might be six months of interest — more than you've actually earned. In that case, you'd get back less than you deposited. Always ask the bank for the exact penalty before you buy, because it varies by institution and by term length.

Some banks offer "no-penalty CDs" that let you withdraw early without losing interest, though the interest rate on these is lower than on traditional CDs. These make sense if you think you might need the money but want a rate better than a savings account.

Why someone would choose a CD over a regular savings account

A regular savings account is liquid — you can withdraw whenever you want — but the interest rate is usually very low, often under 1 percent. A CD locks you in but pays significantly more, sometimes two to three times as much. If you have money you won't need for a year or more, a CD is a straightforward way to earn more without taking investment risk.

CDs are also predictable. You know exactly how much you'll have at the end because the rate doesn't change. With stocks or bonds, the value fluctuates. With a CD, the math is certain. This appeals to people saving for a specific goal — a down payment, a car, a home repair fund — where they want to know the exact amount available on a specific date.

CDs also remove temptation. Because withdrawing early costs money, the penalty discourages you from dipping into savings for everyday expenses. That forced discipline helps some people actually build savings instead of spending it.

The difference between CDs and money market accounts

A money market account is a hybrid between a checking account and a savings account. It typically pays more interest than a regular savings account but less than a CD, and you can usually withdraw money whenever you want (though there may be limits on how many withdrawals per month). There's no maturity date and no early withdrawal penalty.

Choose a CD if you're certain you won't need the money for a set period and want the highest rate. Choose a money market account if you want flexibility and don't mind earning a lower rate. Some people use both: a CD for money they're definitely saving, and a money market account for an emergency fund they might need to access quickly.

How to compare CDs from different banks

Interest rates vary significantly between banks. A large national bank might offer 4.5 percent on a one-year CD, while an online bank offers 5.3 percent for the same term. Over a year, that 0.8 percent difference adds up to real money. On a $25,000 CD, it's $200 in extra interest.

When comparing, look at the annual percentage yield (APY), not just the interest rate. APY accounts for how often interest compounds, so it's the true number you'll earn. Also confirm the penalty structure — some banks charge more for early withdrawal than others. And verify that the bank is FDIC-insured and that your deposit amount is within the $250,000 insurance limit.

Online banks and credit unions often offer higher rates than brick-and-mortar banks because they have lower overhead costs. There's no safety trade-off — as long as they're FDIC or NCUA insured, your money is equally protected whether you buy from a local bank or an online one.

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 additional money into that same CD. If you want to add more to savings, you'd open a separate CD or use a savings account. Some banks let you open multiple CDs at once if you want to ladder different amounts across different terms.

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

You can withdraw it, but you'll pay an early withdrawal penalty. The penalty is usually several months of interest, and on very short-term CDs, it can exceed what you've earned, costing you principal. Before you buy, ask the bank for the exact penalty amount so you know the true cost of early access.

Is a CD a good place to put an emergency fund?

Not usually. Emergency funds need to be accessible without penalty. A regular savings account or money market account is better because you can withdraw instantly if something happens. A CD works for money you're saving for a specific goal months or years away, not for money you might need urgently.

Do I have to pay taxes on CD interest?

Yes. CD interest is taxable income in the year you earn it, even if you don't withdraw the money. The bank will send you a 1099-INT form at tax time showing how much interest you earned. This is one reason CDs in retirement accounts like IRAs can be useful — the interest grows tax-deferred.

What if interest rates drop after I buy a CD?

Your rate stays the same for the entire term. You keep earning whatever rate you locked in, which is an advantage if rates fall. When your CD matures, you'll renew at whatever the new rate is at that time, which could be lower.