What a CD account actually does

A certificate of deposit (CD) is an account where you give a bank or credit union a sum of money for a fixed period—usually three months to five years—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. In exchange for locking your money away, the bank pays you more interest than it would on a regular savings account.

The trade-off is simple: you get a higher rate, but your money is not available if you need it. The bank knows exactly when you will withdraw the funds, so it can lend that money out with confidence and pay you more for the certainty.

Key Takeaways

  • You deposit a lump sum into a CD for a fixed term (three months to five years), and the bank pays you a set interest rate for that entire period.
  • The interest rate on a CD is locked in when you open the account and does not change, even if the bank raises or lowers rates later.
  • Withdrawing money before the term ends triggers an early withdrawal penalty, usually a loss of some or all of the interest you earned.
  • When the term ends, your CD matures and you can withdraw the money without penalty, or roll it into a new CD at the current rate.
  • CDs are insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000 per account, so your principal is protected even if the institution fails.

How the interest rate works and stays the same

When you open a CD, the bank tells you the annual percentage yield (APY)—the rate you will earn for the entire term. That rate is locked in. If you open a one-year CD at 4.50% APY, you will earn 4.50% on your money for the full year, regardless of what happens to interest rates in the market.

This works both ways. If rates rise after you open your CD, you do not benefit—you are still earning the lower rate you locked in. If rates fall, you benefit because you are earning more than new CDs would pay. The bank is betting that rates will not move so far that it regrets the rate it offered you. You are betting that the rate is good enough to be worth giving up access to your money.

The interest compounds—meaning you earn interest on your interest—at intervals the bank sets (usually daily or monthly). The APY already accounts for compounding, so it shows you the true annual return.

What happens if you need the money before the term ends

If you withdraw money from a CD before the maturity date, you pay an early withdrawal penalty. The penalty amount varies by bank and by term length. A three-month CD might have a penalty of one month's interest. A five-year CD might have a penalty of six months' interest or more. Some banks charge a flat dollar amount instead.

The penalty comes out of your interest earnings first. If you have earned less interest than the penalty costs, the bank takes the difference from your principal—meaning you get back less money than you deposited. For example, if you deposit $5,000 in a CD that earns $50 in interest over two months, and the penalty is $100, you lose the $50 in interest plus $50 of your original $5,000.

Before you open a CD, the bank must disclose the penalty amount in writing. Read it. A CD with a high penalty is less flexible if your situation changes.

When the CD matures and what happens next

On the maturity date—the day the term ends—your CD stops earning interest. At that point, you have a window (usually 7 to 10 days) to decide what to do with the money. You can withdraw it in full, or you can let it roll over into a new CD at the bank's current rate.

If you do nothing, many banks automatically roll your CD into a new one with the same term at whatever rate they are offering that day. This can work in your favor if rates have risen, but it locks your money away again without you actively choosing to do so. Read your CD agreement to see what your bank does by default, and set a reminder for a few days before maturity so you can make an intentional choice.

Some banks offer no-penalty CDs, which let you withdraw your money early without losing interest. These pay lower rates than traditional CDs because the bank is taking on more risk. They are useful if you want a higher rate than savings but need some flexibility.

How CD terms and deposit amounts work

CDs come in standard terms: three months, six months, one year, two years, three years, and five years are the most common. Some banks offer terms as short as one month or as long as ten years. Longer terms usually pay higher rates because the bank has your money for longer and can plan further ahead.

You can deposit any amount you want, but most banks have a minimum—often $500 or $1,000, though some online banks accept $100 or less. There is no maximum, except that the FDIC insures only up to $250,000 per depositor per bank. If you have more than $250,000 to put in CDs, you can open accounts at multiple banks to stay fully insured.

You can open multiple CDs at the same bank with different maturity dates—a strategy called a CD ladder. For example, you might open five one-year CDs, each maturing in a different year. As each one matures, you can reinvest it at the current rate. This gives you some of the higher rates of longer terms while letting you access some of your money each year.

FDIC and NCUA insurance protects your principal

Money in a CD at a bank is insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per depositor per bank. Money in a CD at a credit union is insured by the National Credit Union Administration (NCUA) up to the same amount. This means if the bank or credit union fails, you get your principal back, even if the institution goes under.

The insurance covers the principal you deposited plus any interest you have earned up to the maturity date. It does not cover losses from early withdrawal penalties. If you withdraw early and pay a penalty that eats into your principal, the FDIC still insures what you have left, but you have already lost money to the penalty.

CD rates and how they compare to other accounts

CD rates change based on what the Federal Reserve does with its benchmark interest rate. When the Fed raises rates, banks raise CD rates to attract deposits. When the Fed lowers rates, CD rates fall. The rate you lock in depends on when you open the CD and which bank you choose.

Online banks typically offer higher CD rates than brick-and-mortar banks because they have lower overhead costs. You can compare rates across banks on financial websites, but remember that the highest rate is not always the best deal if the early withdrawal penalty is steep or the term does not fit your timeline.

A CD usually pays more than a regular savings account but less than a money market account at the same bank. The difference depends on the bank and the current rate environment. The main advantage of a CD over a savings account is the higher rate; the main disadvantage is that your money is locked away.

Frequently Asked Questions

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

No. A CD is a fixed deposit. Once you open it, you cannot add funds to that account. If you want to invest more money in a CD, you open a separate CD. Some people open multiple CDs at different times to build a ladder.

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

A savings account lets you withdraw money anytime without penalty and usually earns a variable interest rate that changes with the market. A CD locks your money for a set term, pays a fixed rate, and charges a penalty if you withdraw early. CDs pay more interest because you give up access; savings accounts pay less but stay liquid.

Do I have to pay taxes on CD interest?

Yes. Interest earned on a CD is taxable income in the year you earn it, even if you do not withdraw the money. The bank will send you a 1099-INT form at tax time showing how much interest you earned. You report this on your tax return.

What happens if I forget about my CD and miss the maturity date?

If you miss the maturity window, most banks automatically roll your CD into a new one at the current rate. You will be locked in again for another term. Set a calendar reminder a week before maturity so you can decide whether to withdraw, roll over, or move the money elsewhere.

Is a CD a good place to put emergency savings?

A CD is not ideal for emergency money because you cannot access it without paying a penalty. Emergency savings should stay in a regular savings account or money market account where you can withdraw anytime. CDs work better for money you know you will not need for a specific period.