What a CD is and how you earn money from it

A certificate of deposit is an agreement between you and a bank or credit union: you give them a sum of money for a set period of time, and they pay you a fixed interest rate on that money. When the time period ends — called the maturity date — you get your original money back plus the interest you earned.

The interest rate is locked in when you open the CD, which means it does not change even if rates rise or fall in the market. If you open a one-year CD at 4.5%, you will earn 4.5% for the full year, regardless of what happens to other rates. This predictability is the main reason people use CDs: you know exactly how much money you will have at the end.

The bank uses your money during the CD term to make loans and investments. In exchange, they pay you interest. The longer you agree to lock your money away, the higher the interest rate they typically offer — a two-year CD usually pays more than a one-year CD, for example.

Key Takeaways

  • You deposit money for a fixed time period and receive a may provide interest rate that does not change.
  • Your money is locked in until the maturity date; withdrawing early usually costs you a penalty that reduces your earnings.
  • CDs are insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000 per account, making them very safe.
  • Interest rates vary by bank, CD length, and current market conditions, so comparing offers before opening a CD saves money.
  • When your CD matures, you can withdraw the money, open a new CD, or let it automatically renew at the bank's current rate.

How the maturity date and term length work

The term is how long your money stays locked in the CD. Common terms are three months, six months, one year, two years, three years, and five years. Some banks offer terms as short as one month or as long as ten years, but three months to five years covers most options.

The maturity date is the specific calendar date when your term ends. If you open a one-year CD on January 15, your maturity date is January 15 of the following year. On that date, the bank will make your money available — either by depositing it into a linked account or holding it for you to withdraw.

Longer terms almost always pay higher interest rates. A five-year CD might pay 4.8% while a one-year CD pays 4.2%, for example. The trade-off is that your money is locked away longer. If you need the cash before the maturity date, you will face a penalty.

Early withdrawal penalties and what they cost you

If you withdraw money from a CD before the maturity date, the bank charges an early withdrawal penalty. This penalty is typically a certain number of months' worth of interest. A common penalty might be three months of interest, meaning if your CD was earning $100 per month, you would lose $300.

The penalty amount varies by bank and by CD term. Longer-term CDs usually have larger penalties — a five-year CD might have a penalty of six months' interest, while a one-year CD might have a penalty of three months. Some banks publish the exact penalty amount when you open the CD; others do not, so it is worth asking before you commit.

The penalty comes out of your interest earnings first. If you have earned enough interest to cover the penalty, you still get your original deposit back. But if you withdraw very early, the penalty can eat into your principal — meaning you get back less than you put in. This is why CDs work best for money you genuinely will not need until the maturity date.

Interest rates and how they are set

CD interest rates are set by each individual bank or credit union, not by a central authority. This means rates vary significantly from one institution to another. One bank might offer 4.5% on a one-year CD while another offers 4.1% for the same term — a difference that adds up over time.

Rates also depend on the current economic environment and what the Federal Reserve is doing. When the Fed raises its benchmark rate, banks typically raise CD rates too. When the Fed cuts rates, CD rates usually fall. This is why CD rates change month to month, even though your rate stays locked in once you open your CD.

Online banks and credit unions often pay higher rates than brick-and-mortar banks because they have lower overhead costs. Comparing rates across multiple institutions before opening a CD can mean earning hundreds of dollars more over the term. Rate comparison websites and bank websites themselves show current offers, though rates change frequently.

FDIC insurance and how your money is protected

Money in a CD at a bank is protected by FDIC insurance (Federal Deposit Insurance Corporation) up to $250,000 per depositor, per bank. Money in a CD at a credit union is protected by NCUA insurance (National Credit Union Administration), also up to $250,000 per depositor, per credit union.

This means if the bank or credit union fails, the government guarantees you will get your money back — principal plus any interest earned up to the maturity date. You do not need to do anything to activate this protection; it is automatic for any CD opened at an insured institution.

If you have more than $250,000 to invest in CDs, you can spread the money across multiple banks or credit unions to keep all of it insured. For example, $300,000 split between two banks ($150,000 at each) would be fully insured at both institutions.

What happens when your CD matures

When your maturity date arrives, the bank will notify you that your CD has matured. You then have a few options. You can withdraw the full amount (principal plus interest) and use the money however you want. You can open a new CD at the same bank or a different one. Or you can do nothing and let the CD automatically renew.

If you do nothing, most banks will automatically renew your CD into a new term of the same length at the bank's current CD rate. This is convenient if you want to keep your money invested, but the new rate might be lower than what you were earning. If rates have fallen significantly, you might want to shop around or choose a different term length instead of accepting the automatic renewal.

Banks usually give you a grace period — often 7 to 10 days after maturity — to change your mind about the automatic renewal. If you do not want to renew, you can contact the bank during this window and withdraw your money instead. After the grace period ends, the new CD term begins and your money is locked in again.

How CDs compare to savings accounts and money market accounts

CDs typically pay higher interest rates than regular savings accounts because you agree to lock your money away. A savings account lets you withdraw money anytime without penalty, so banks pay less interest. A money market account falls somewhere in between — it usually pays more than savings but less than a CD, and it may allow limited withdrawals.

The trade-off is flexibility. With a savings account, your money is always available. With a CD, you sacrifice access to get a higher rate. If you have money you will not need for several months or years, a CD usually makes sense. If you might need the cash sooner, a savings account is safer because there is no penalty for withdrawing.

Some people use a CD ladder strategy to balance these concerns: they open multiple CDs with different maturity dates (for example, one-year, two-year, and three-year CDs). As each one matures, they can either withdraw the money or roll it into a new longer-term CD. This way, some of their money is always becoming available while still earning higher rates on the rest.

Frequently Asked Questions

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

No, most CDs do not allow additional deposits after you open them. You deposit a lump sum at the start, and that amount stays the same until maturity. If you want to invest more money, you would need to open a separate CD. Some banks offer special products that allow additions, but these are uncommon.

What happens to my interest if I withdraw early?

You lose interest equal to the early withdrawal penalty. The penalty is deducted from your interest earnings first. If the penalty is larger than the interest you have earned so far, you will get back less than your original deposit. This is why early withdrawal should be a last resort.

Are CDs taxed?

Yes, the interest you earn on a CD is taxable income. 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. The interest is taxed at your ordinary income tax rate, not as capital gains.

Should I open a CD if interest rates might go up?

If you think rates will rise soon, a shorter-term CD (like three or six months) lets you reinvest at a higher rate sooner. A longer-term CD locks you in at today's rate, which could be a disadvantage if rates climb. However, if you need the money to stay invested and rates are uncertain, locking in a known rate still has value.

Can I use a CD as collateral for a loan?

Yes, some banks will lend you money using your CD as collateral. You keep earning interest on the CD while borrowing against it, though the interest rate on the loan is usually higher than the CD rate. This is sometimes called a CD-secured loan and can be useful if you need cash but do not want to pay an early withdrawal penalty.