A CD is a savings account where you agree to leave your money untouched for a set time in exchange for a higher interest rate

CD stands for certificate of deposit. When you open one, you give the bank a sum of money—say $1,000 or $5,000—and promise not to touch it for a specific period. That period might be three months, one year, five years, or any length the bank offers. In return, the bank pays you a higher interest rate than it would on a regular savings account.

The trade-off is simple: you get better interest, but your money is locked up. If you withdraw before the time is up, you pay a penalty—usually a few months' worth of interest. That penalty exists because the bank has counted on having your money for the full term and has already lent it out or invested it elsewhere.

Key Takeaways

  • A CD requires you to deposit money for a fixed period—typically three months to five years—in exchange for a may provide interest rate higher than a savings account.
  • The bank pays you interest on the full amount, and you receive the principal plus interest when the term ends.
  • Withdrawing early triggers a penalty, usually several months of interest, so CDs work best for money you won't need during the term.
  • Different banks offer different rates and terms, so comparing them before you open a CD can mean hundreds of dollars in extra interest.
  • When your CD matures, you can withdraw the money, open a new CD, or let it roll over into another term at the bank's current rate.

How the interest rate and term length work together

The longer you lock your money away, the higher the interest rate usually is. A three-month CD might pay 4.5 percent annual interest, while a five-year CD at the same bank might pay 4.8 percent. The bank offers more because it gets to use your money for longer.

The interest rate is fixed—it does not change during the term. If you open a one-year CD at 4.5 percent, you will earn 4.5 percent for the full year, even if the bank's rates drop to 3 percent next month. That certainty is part of what makes CDs appealing: you know exactly how much you will have when the term ends.

Interest compounds, meaning you earn interest on your interest. Most banks compound daily or monthly. A $5,000 CD at 4.5 percent annual interest compounded daily will grow slightly more than one compounded monthly, though the difference is small.

What happens when your CD reaches its maturity date

When the term ends—the maturity date—the bank sends you a notice, usually 10 to 14 days before. At that point, you have choices. You can withdraw the full amount (principal plus all interest earned). You can open a new CD with the same bank or a different one. Or you can do nothing, and many banks will automatically roll over your CD into a new term at whatever rate they are currently offering.

Auto-rollover is convenient but not always the best deal. If rates have dropped, you might earn less on the new term. If rates have risen, you might miss out on the higher rate. Read the maturity notice carefully and decide before the rollover happens, or call the bank to stop it if you want to shop around.

Why early withdrawal penalties exist and what they cost

When you withdraw before maturity, the bank charges a penalty because it has already committed your money elsewhere. The penalty is typically three to six months of interest, though it varies by bank and by term length. A longer-term CD usually has a steeper penalty than a short-term one.

Example: You open a $10,000 five-year CD earning 4.8 percent annual interest. After one year, you need the money and withdraw it. The bank might charge a penalty equal to 12 months of interest—roughly $480. You would receive $10,000 plus the interest you earned ($480), minus the penalty ($480), for a net of $10,000. You made no money, and you tied up the cash for a year.

Some banks offer no-penalty CDs, which let you withdraw without a fee. These exist, but they pay lower interest rates to offset the risk to the bank. They make sense only if you are genuinely uncertain whether you will need the money.

How CDs compare to regular savings accounts

A regular savings account is liquid—you can withdraw whenever you want without penalty. But the interest rate is much lower, often 0.01 to 0.5 percent. A CD locks your money but pays 4 to 5 percent or more, depending on the bank and the term.

For money you know you will not need for a year or more, a CD almost always wins. For money you might need soon, a savings account is the right choice. Some people split the difference: they put money they will definitely not touch in a CD, and keep an emergency fund in a savings account earning a lower rate.

Where to find and compare CD rates

Banks and credit unions both offer CDs, and rates vary widely. A local bank might pay 3.5 percent on a one-year CD while an online bank pays 4.8 percent for the same term. That difference compounds into real money over time.

You can compare rates on bank websites directly, or use rate-comparison sites that list CDs from many institutions. Look at the annual percentage yield (APY), not just the interest rate—APY accounts for compounding and shows you the true return. Also check the minimum deposit required; some banks require $500, others $25,000 or more.

Make sure the bank is FDIC-insured (or the credit union is NCUA-insured). This means if the bank fails, the government protects your deposit up to $250,000. Most banks are, but it is worth confirming before you hand over money.

Special CD types and when they make sense

Most CDs are straightforward: you deposit a lump sum and wait. But some banks offer variations. A bump-up CD lets you request a higher rate once during the term if rates rise. A step-up CD automatically increases your rate at set intervals. A liquid CD or no-penalty CD lets you withdraw without penalty, though at a lower rate.

These variations rarely make sense unless you have a specific reason. A bump-up CD is useful only if you think rates will rise during your term—and you have to request the bump yourself, so you have to pay attention. A step-up CD is useful if you expect rates to climb steadily. For most people, a standard CD at the highest rate available is the simplest choice.

Frequently Asked Questions

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

No. A CD is a fixed deposit. Once you open it, you cannot add more money to that CD. If you want to deposit more, you would open a separate CD. Some banks let you open multiple CDs at once with different terms, which spreads your money across different maturity dates.

What if I need the money before the CD matures?

You can withdraw it, but you will pay an early withdrawal penalty—usually several months of interest. Before you withdraw, call the bank and ask exactly what the penalty is. Sometimes it is worth paying; sometimes it is not. If you think you might need the money, a regular savings account or a no-penalty CD is safer.

Is the interest I earn on a CD taxable?

Yes. The interest 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. If the CD is in a retirement account like an IRA, the interest is not taxed until you withdraw from the account.

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

If the bank is FDIC-insured, your deposit and all accrued interest are protected up to $250,000. The FDIC will either transfer your CD to another bank or pay you out. Your CD term does not change—you still get your money when it matures, or you can request it sooner.

Can I move a CD to a different bank before it matures?

You can withdraw it and move the money, but you will pay the early withdrawal penalty. You cannot transfer the CD itself to another bank. If you want to move to a higher-rate CD elsewhere, calculate whether the penalty is worth it—sometimes it is, sometimes it is not.