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

A certificate of deposit (CD) is a contract between you and a bank or credit union. You give them a lump sum of money, agree not to touch it for a specific period—called the term—and in return they pay you a fixed interest rate, usually higher than a regular savings account offers. When the term ends, you get your original money back plus the interest you earned.

The trade-off is simple: you give up access to your cash for months or years, and the bank rewards you for that by paying more. If you withdraw the money before the term is up, you pay a penalty—usually a certain number of months' worth of interest. That penalty is why CDs work best for money you know you won't need soon.

Key Takeaways

  • A CD locks your money away for a fixed term (3 months to 5 years or longer) in exchange for a may provide interest rate higher than savings accounts.
  • You receive your full deposit plus earned interest when the term ends, and the rate does not change during that time.
  • Withdrawing money early triggers a penalty, typically equal to several months of interest, so CDs suit money you will not need in the near term.
  • CD rates vary by bank, term length, and deposit amount, so comparing offers across institutions can meaningfully increase your earnings.
  • CDs are FDIC-insured up to $250,000 per depositor per bank, making them a low-risk place to store savings.

How the interest rate and term length work together

When you open a CD, you choose the term—the length of time your money stays locked in. Common terms are 3 months, 6 months, 1 year, 2 years, 3 years, and 5 years. Longer terms almost always come with higher interest rates. A 5-year CD might pay 4.5% annual interest while a 3-month CD at the same bank pays 4.0%, for example. The bank pays more for longer terms because they get to use your money for a longer period.

The interest rate is fixed, meaning it will not go up or down while your CD is open. If you lock in 4.5% for 2 years, you earn 4.5% for the full 2 years, even if rates in the market drop to 3% or rise to 5%. This predictability is one reason CDs appeal to savers who want to know exactly what they will earn.

Interest compounds—usually daily or monthly—which means you earn interest on your interest. A $10,000 CD at 4.5% annual interest compounded daily will earn slightly more than simple math suggests, because each day's interest gets added to the balance and earns interest itself the next day.

What happens when your CD matures

When your term ends, your CD matures. The bank deposits your original deposit plus all earned interest into your account. At that point you have a choice: withdraw the money, or let the bank roll it into a new CD at whatever rate they are currently offering.

Most banks have a grace period after maturity—usually 7 to 10 days—during which you can withdraw without penalty. If you do nothing during that window, many banks automatically renew your CD into a new term at the current rate. Read your CD agreement to know your bank's renewal policy, because rates may have dropped since you opened the original CD.

Early withdrawal penalties and when they apply

If you need your money before the term ends, you can withdraw it, but you will pay a penalty. The penalty is usually stated as a number of months of interest—for example, "3 months of interest" or "6 months of interest." On a $10,000 CD earning 4.5% annually, 3 months of interest is about $112.50, so that would be your penalty.

Some banks calculate the penalty differently—as a percentage of the deposit or a flat fee—so check your CD's terms. The penalty comes out of your interest earnings first; if your earnings are not large enough to cover it, the bank takes the difference from your principal. This is why CDs are not a good choice for money you might need within the next year or two.

How CDs compare to regular savings accounts

A regular savings account lets you deposit and withdraw money whenever you want, with no penalty. The trade-off is that savings account rates are much lower—often 0.01% to 0.5% annually at traditional banks. A CD locks your money away but pays significantly more: current rates range from around 4% to 5.5% depending on the bank and term, compared to under 1% for most savings accounts.

If you have money you will not need for at least 6 months to a year, a CD almost always earns more. If you might need the money sooner, a high-yield savings account is safer because you can access it without penalty. Some savers use both: a CD for money they are saving for a specific goal a year or two away, and a savings account for their emergency fund.

FDIC insurance and how your money is protected

CDs held at banks are protected by FDIC insurance (Federal Deposit Insurance Corporation). This means if the bank fails, the government guarantees you will get your money back, up to $250,000 per depositor per bank. If you have a CD at Bank A and a savings account at Bank A, they count together toward that $250,000 limit. If you have CDs at two different banks, each is insured separately up to $250,000.

Credit unions offer a similar protection called NCUA insurance (National Credit Union Administration), also up to $250,000 per member per institution. This insurance covers your deposit and all earned interest, so you are protected even if the institution fails before your CD matures.

Where to find and compare CD rates

CD rates vary widely by bank, term, and deposit amount. Your local bank might offer 3.5% on a 1-year CD while an online bank offers 4.8% for the same term. Over a year, that difference adds up: on a $10,000 deposit, 3.5% earns $350 while 4.8% earns $480—a difference of $130 for doing the same research.

You can compare rates on financial websites that track CD offerings across multiple banks, or visit individual bank websites directly. Some banks offer higher rates for larger deposits—a $25,000 CD might pay 0.25% more than a $5,000 CD. A few banks offer no-penalty CDs, which let you withdraw early without a penalty, though they usually pay slightly less interest than standard CDs.

Frequently Asked Questions

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

No. A CD is a fixed contract for a specific amount. Once you open it, you cannot add deposits. If you want to save more, you would need to 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 is a CD ladder and why would I use one?

A CD ladder is when you open multiple CDs with different maturity dates—for example, one 1-year CD, one 2-year CD, and one 3-year CD. As each one matures, you can renew it at the current rate or withdraw the money. This spreads out your access to cash and lets you take advantage of higher rates on longer terms without locking all your money away for years.

Do I pay taxes on CD interest?

Yes. CD interest is taxable income in the year you earn it. Your bank will send you a 1099-INT form at tax time showing how much interest you earned. You report this on your tax return. Some people keep CDs in retirement accounts like IRAs to defer taxes on the earnings.

What happens if interest rates drop after I open my CD?

Your rate stays the same for the full term—that is the point of a fixed rate. If rates drop, you are locked in at the higher rate, which is good for you. When your CD matures, you can renew at whatever the new rate is, which may be lower.

Is a CD a good place for my emergency fund?

Not usually. Emergency funds need to be accessible without penalty, and CDs penalize early withdrawal. A high-yield savings account is better for emergency money because you can withdraw it anytime. CDs work better for savings with a specific timeline—money you know you will need in 2 or 3 years but not sooner.