What a CD interest rate is and how it affects your money

A Certificate of Deposit interest rate is the percentage of your money that a bank or credit union pays you each year for letting them hold your deposit. When you open a CD, you agree to leave a sum of money untouched for a set period — usually three months to five years. In exchange, the bank guarantees you a fixed interest rate for that entire time. The rate does not change, even if the Federal Reserve raises or lowers rates after you open the account.

The interest rate determines how much extra money you will have when the CD reaches its maturity date. A CD with a 4.5% annual rate on $10,000 will pay you $450 per year in interest. That money is yours to keep, separate from your original $10,000. Banks publish their CD rates publicly, and rates vary by bank, by the length of the CD term, and by the size of your deposit.

CD rates are almost always higher than savings account rates at the same bank because you are giving up access to your money. The bank can lend that money out with confidence, knowing exactly when you will withdraw it. That certainty is worth paying you more.

Key Takeaways

  • A CD interest rate is locked in on the day you open the account and does not change for the entire term, whether rates rise or fall.
  • Longer CD terms typically offer higher rates than shorter ones at the same bank, though this is not always true.
  • The rate you receive depends on the bank, the term length, the deposit amount, and the current interest rate environment.
  • Interest accrues daily or monthly depending on the bank's terms, and you receive the full amount when the CD matures.

How banks set CD rates

Banks set CD rates based on what the Federal Reserve is doing with short-term interest rates, what other banks are offering, and how much money the bank needs to attract. When the Federal Reserve raises its benchmark rate, banks typically raise CD rates within days or weeks. When the Fed cuts rates, CD rates fall. However, banks do not move in lockstep — one bank might offer 4.75% while another offers 4.25% for the same three-month CD.

The term length matters significantly. A one-year CD usually pays less than a five-year CD because the bank has your money for a shorter time. However, during periods when interest rates are expected to fall, banks sometimes offer higher rates on shorter terms to attract deposits quickly. You can compare rates across banks using rate-tracking websites, but you will need to check each bank's site directly to see their current offerings, since rates change frequently.

The difference between annual percentage yield and stated rate

Banks quote CD rates in two ways: the stated interest rate and the Annual Percentage Yield (APY). The stated rate is the straightforward percentage — 4.5%, for example. The APY includes the effect of compounding, which means interest earned on your interest. If a bank compounds interest monthly, you earn interest in month two on the interest you earned in month one.

The APY is always equal to or higher than the stated rate. For short-term CDs, the difference is small — perhaps 0.01 or 0.02 percentage points. For longer terms or higher rates, the difference grows. When comparing CDs across banks, always compare the APY, not the stated rate, because APY shows you the true amount you will earn. Banks are required by law to display the APY prominently.

When you earn interest and how it reaches your account

Interest on a CD accrues — builds up — according to a schedule set by the bank. Most banks compound interest daily, meaning they calculate what you owe every single day, but they credit it to your account monthly or quarterly. Some banks credit interest only at maturity, meaning you see nothing until the CD term ends. Read the CD's terms before you open it to understand when you will see the money.

When the CD matures, the bank deposits your original deposit plus all accrued interest into the account you specify — usually a checking or savings account at the same bank. You can then withdraw the money, move it to another bank, or roll it into a new CD. If you do nothing, many banks automatically roll the CD into a new term at the current rate, though some require you to take action within a grace period, usually seven to ten days.

How CD rates compare to other savings options

CD rates are higher than regular savings accounts but lower than what you might earn in the stock market over time. A high-yield savings account at an online bank might currently pay 4.0% to 4.5%, while a CD at the same bank might pay 4.75% to 5.0% for a one-year term. The trade-off is that you cannot touch the CD money without penalty, while savings account money is always available.

Money market accounts fall between savings accounts and CDs in both rate and flexibility. Treasury bills, which are short-term government bonds, sometimes pay rates competitive with or higher than CDs, and they are backed by the U.S. government. The choice depends on when you will need the money and how much risk you are willing to accept. CDs carry no investment risk — your principal is insured by the FDIC up to $250,000 — but you lose money if you withdraw early.

What happens if you need the money before maturity

Most CDs charge an early withdrawal penalty if you take your money out before the term ends. The penalty is usually expressed as a number of months of interest. A CD with a three-month penalty means you lose three months' worth of interest if you withdraw early. On a $10,000 CD earning 4.5% annually, that penalty would be about $112.50. Some banks charge a flat dollar amount instead, and a few charge a percentage of the principal.

The penalty is deducted from your interest, not from your original deposit — you always get your principal back. However, if the penalty exceeds the interest you have earned, the bank deducts the difference from your principal. Before opening a CD, confirm the penalty amount and whether you might need the money. No-penalty CDs exist but pay lower rates in exchange for the flexibility to withdraw without cost.

How inflation affects what your CD rate is really worth

A 4.5% CD rate sounds good until you consider inflation. If inflation is running at 3.5% per year, your real return — the purchasing power you actually gain — is only about 1%. Your money grows in dollar terms, but it buys less stuff. This matters most for longer-term CDs. A five-year CD locked in at 4.5% might look attractive today, but if inflation rises to 5% in year two, you are losing purchasing power for the rest of the term.

This is why many people ladder CDs — opening multiple CDs with different maturity dates so that portions of their money mature each year. If rates rise, you can reinvest the maturing portion at the higher rate. If rates fall, you still have some money earning the higher locked-in rate. Laddering does not protect you from inflation, but it gives you more flexibility to respond to changing rate environments.

Frequently Asked Questions

Can a CD interest rate change after I open the account?

No. Once you open a CD, the interest rate is locked in for the entire term. If interest rates rise or fall in the market, your rate stays the same. This is the main feature of a CD — certainty. You know exactly how much you will earn on the day you open it.

Why do longer CDs pay higher rates than shorter ones?

Banks pay more for longer terms because they have your money for a longer time and face more uncertainty about future interest rates. If rates rise significantly, the bank is stuck paying you the lower rate you locked in. Longer terms mean longer exposure to that risk, so banks compensate you with higher rates.

Is the interest on a CD taxable?

Yes. CD interest is taxable as ordinary income in the year it is credited to your account, even if you do not withdraw it. The bank will send you a 1099-INT form at tax time showing the interest you earned. If the CD is in a retirement account like an IRA, the interest grows tax-deferred.

What is the difference between APY and APR on a CD?

APY (Annual Percentage Yield) includes the effect of compounding and shows your true annual return. APR (Annual Percentage Rate) is the straightforward stated rate without compounding. For CDs, banks are required to show you the APY, which is the number that matters for comparison.

Do all banks offer the same CD rates?

No. Rates vary significantly by bank, by term length, and by deposit size. Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs. Credit unions sometimes offer competitive rates to their members. You should compare rates across at least three to five institutions before opening a CD.