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

When you open a CD, you give a bank or credit union a lump sum of money — say $5,000 — and agree to leave it untouched for a specific period. That period might be three months, one year, five years, or longer, depending on the CD you choose. In return, the bank pays you a fixed interest rate that is almost always higher than what you would earn in a regular savings account. At the end of the term, you get your original money back plus the interest you earned.

The trade-off is simple: you cannot touch the money without a penalty. If you withdraw before the term ends, the bank charges a fee that eats into your earnings. That penalty is why CDs pay more — the bank knows your money will stay put, so it can lend that money out and make its own return.

Key Takeaways

  • You deposit a fixed amount of money for a fixed time period and receive a may provide interest rate that does not change.
  • The longer the term, the higher the rate — a five-year CD typically pays more than a one-year CD at the same bank.
  • Withdrawing early triggers a penalty that reduces your earnings, so only use a CD for money you will not need during the term.
  • CDs are insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000, so your principal is protected even if the institution fails.

How the interest rate and term length work together

The interest rate on a CD is locked in the day you open it. If rates rise after you buy your CD, you still earn the original rate. If rates fall, you still earn the original rate. That certainty is part of what makes CDs predictable — you know exactly how much money you will have when the term ends.

Term length and rate are linked. A three-month CD might pay 4.5 percent, while a five-year CD at the same bank might pay 5.2 percent. Banks offer higher rates for longer terms because they want to hold your money longer. The longer you commit, the more they can count on having that cash available to lend.

The actual rates vary by bank and change based on what the Federal Reserve does with interest rates. When Fed rates are high, CD rates are high. When Fed rates are low, CD rates are low. Shopping around matters — different banks offer different rates on the same term length.

What happens when your CD matures

When the term ends, your CD reaches maturity. The bank sends you a notice a few weeks before, telling you what happens next. You have a choice window — usually seven to ten days — to decide what to do with the money.

Your options are: withdraw the money and close the CD, let the bank automatically roll the money into a new CD at the current rate, or move the money to a different account at the same bank. If you do nothing and the bank's policy allows auto-renewal, your money rolls into a new CD at whatever rate the bank is offering at that moment. That new rate might be higher or lower than what you earned before.

Read the maturity notice carefully. Some banks auto-renew by default; others require you to take action. If you miss the window and the bank auto-renews into a rate you do not like, you usually have a grace period — often three to five days — to withdraw without penalty.

Early withdrawal penalties and when they apply

If you need your money before the term ends, the bank charges a penalty. The penalty is usually stated as a number of months of interest. A CD with a three-month interest penalty means you lose three months' worth of the interest you would have earned. On a $10,000 CD earning 5 percent annually, that is roughly $125.

The penalty comes out of your interest earnings first. If you have not earned enough interest yet to cover the penalty, it comes out of your principal — meaning you get back less than you deposited. This is rare with short-term CDs but can happen if you withdraw very early from a long-term CD.

Some banks offer no-penalty CDs that let you withdraw early without a fee, but they pay a lower interest rate to offset that flexibility. The trade-off is real: more flexibility means less interest.

Who should use a CD and who should not

CDs work best for money you know you will not need for a specific period. If you have an emergency fund that is already fully stocked and you have extra cash sitting in a low-interest savings account, moving some of that to a CD makes sense. You earn more interest, and you still have access to your money — you just pay a penalty if you need it early.

CDs do not work well if you might need the money soon or if you want flexibility. If you have a job that might change, a medical situation that could get expensive, or you are saving for something that might happen sooner than planned, keep that money in a regular savings account or money market account instead. The lower interest rate is worth the peace of mind.

CDs also do not protect you from inflation. If you lock in a 4 percent rate for five years and inflation averages 3 percent, your real return is only about 1 percent. You are earning money, but it is buying less than it would have at the start.

FDIC insurance and what it covers

Money in a CD at a bank is insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per depositor, per bank. If the bank fails, the FDIC pays you back. This means your principal is safe — you will not lose the money you deposited.

The $250,000 limit applies per bank, not per CD. If you have three CDs totaling $300,000 at the same bank, only $250,000 is insured. If you want to insure more than $250,000, open CDs at different banks. Each bank's FDIC coverage is separate.

Credit unions use a similar system called NCUA insurance, which also covers up to $250,000. The protection works the same way — your money is safe if the institution fails.

How CDs compare to other savings options

A regular savings account is liquid — you can withdraw anytime without penalty — but it pays very little interest, often less than 0.5 percent. A money market account pays more than savings but less than a CD, and it gives you check-writing or debit card access. A CD pays the most interest but locks your money away.

Treasury bills (T-bills) are short-term loans to the federal government that mature in weeks or months. They are backed by the U.S. government, so they are extremely safe, but you need at least $100 to buy one and they require a brokerage account. High-yield savings accounts at online banks now pay rates close to CD rates without locking your money up, which has made them more competitive.

The right choice depends on when you need the money and how much interest matters to you. If you need access, a high-yield savings account is hard to beat. If you can lock money away for a year or more, a CD usually pays more.

Frequently Asked Questions

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

No. CDs are fixed-amount products. You deposit a lump sum at the start, and that amount stays the same until maturity. If you want to add more money, you must open a separate CD. Some banks let you open multiple CDs at different times.

What if interest rates drop after I buy my CD?

Your rate does not change. You keep earning the rate you locked in when you opened the CD. This is one advantage of CDs — you are protected if rates fall. The downside is you miss out if rates rise.

Is there a minimum amount I have to deposit?

Most banks require a minimum deposit to open a CD, often $500 or $1,000, though some online banks have minimums as low as $100. A few banks have no minimum. Check the specific bank's requirements before you open an account.

Can I use a CD as collateral for a loan?

Yes. Some banks offer CD-secured loans where you borrow against your CD without withdrawing it. You pay interest on the loan, but your CD keeps earning interest at its original rate. This avoids the early withdrawal penalty if you need cash.

What happens if I die before my CD matures?

Your CD becomes part of your estate and passes to your beneficiary or heirs according to your will or the bank's beneficiary designation. The CD continues to earn interest until maturity unless the beneficiary chooses to withdraw it early.