A certificate of deposit is a savings account where you agree to leave your money untouched for a set period in exchange for a higher interest rate

A certificate of deposit (CD) is a contract between you and a bank or credit union. You give them a lump sum of money—say $5,000—and promise not to touch it for a fixed time period, usually anywhere from three months to five years. In return, the bank pays you a higher interest rate than a regular savings account would. When the time is up, you get your original money back plus the interest earned.

The trade-off is straightforward: you lose access to your money for the duration. If you withdraw before the maturity date (the day the CD term ends), you pay an early withdrawal penalty, which is usually a few months' worth of interest. That penalty varies by bank and by the CD's term length.

CDs are insured by the Federal Deposit Insurance Corporation (FDIC) if held at a bank, or by the National Credit Union Administration (NCUA) if held at a credit union. That means if the bank fails, your money up to $250,000 is protected.

Key Takeaways

  • You lock money away for a set period—three months to five years—and receive a may provide interest rate higher than a savings account.
  • Withdrawing early triggers a penalty, usually several months of interest, so only use a CD for money you won't need during the term.
  • Interest rates on CDs vary by bank, term length, and the current economic environment, so comparing offers before you commit is worthwhile.
  • Your deposit is insured up to $250,000 by the FDIC or NCUA, making CDs one of the safest places to keep money.
  • When your CD matures, you can withdraw the money, move it to a new CD, or let it roll over automatically if the bank offers that option.

How interest rates and terms work together

The longer you agree to lock your money away, the higher the interest rate the bank typically offers. A three-month CD might pay 4.5 percent annually, while a five-year CD from the same bank might pay 5.2 percent. The bank uses your money during that time, so they reward you for committing to a longer period.

Interest rates also shift with the broader economy. When the Federal Reserve raises its benchmark rate, banks usually raise CD rates too. When rates fall, CD rates fall with them. This means the rate you see today may not be the rate available next month.

Interest compounds on most CDs, meaning you earn interest on your interest. If your CD pays 5 percent annually and compounds monthly, each month's interest gets added to your balance, and next month's interest is calculated on that larger amount. By the end of the year, you earn slightly more than 5 percent of your original deposit.

When a CD makes sense for your money

A CD works best for money you know you won't need for several months or years. If you have an emergency fund, a CD is not the right place for it—you need that money accessible without penalty. But if you have a bonus coming in, an inheritance, or savings earmarked for a goal two years away, a CD lets that money grow safely at a may provide rate.

CDs are also useful if you want to avoid the temptation to spend. Once the money is locked in, you cannot easily access it without paying a price. That psychological barrier can help you stick to a savings goal.

If you are worried about stock market volatility or want a break from managing investments, a CD offers certainty. You know exactly how much you will have when the term ends—no surprises, no losses.

The penalty for early withdrawal and what it costs

Every CD specifies an early withdrawal penalty in its terms. This penalty is usually expressed as a number of months of interest. A CD with a three-month penalty means if you withdraw early, you lose three months' worth of the interest you would have earned.

On a $10,000 CD earning 5 percent annually with a three-month penalty, that costs you roughly $125 (one quarter of the annual interest). On a longer-term CD with a larger penalty, the cost can be several hundred dollars. Some banks cap the penalty at the interest earned so far, meaning you cannot lose principal, but others do not.

Before opening a CD, read the penalty terms carefully. If there is any chance you might need the money, factor the penalty into your decision. Some banks offer "no-penalty CDs" that let you withdraw without a penalty, but they pay lower interest rates in exchange.

Comparing CD offers from different banks

Interest rates vary significantly between banks. A large national bank might offer 4.8 percent on a one-year CD, while an online bank offers 5.3 percent for the same term. Over a year, that 0.5 percent difference adds up—on $10,000, it means $50 more in your pocket.

Online banks and credit unions often offer higher rates than brick-and-mortar banks because they have lower overhead costs. However, make sure any bank you choose is FDIC-insured (or the credit union is NCUA-insured). You can verify this on the FDIC or NCUA website.

Also compare the penalty terms, not just the rate. A bank offering 5.5 percent with a twelve-month penalty is less attractive than one offering 5.4 percent with a three-month penalty if you think you might need the money sooner.

What happens when your CD matures

On the maturity date, your CD stops earning interest. At that point, you have several 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 current rate, which may be higher or lower than your previous CD. Or you can move the money to a savings account or money market account if you want easier access.

Many banks offer automatic renewal, meaning if you do nothing, your CD rolls into a new CD at the current rate for the same term length. This is convenient if you want to keep the money locked away, but it also means you might miss a window to move your money to a better rate elsewhere. Mark your maturity date on your calendar and check rates a week or two before it arrives.

If you withdraw before maturity, you pay the penalty. If you withdraw after maturity, there is no penalty—the CD has already fulfilled its contract.

CDs versus savings accounts and money market accounts

A regular savings account is more flexible but pays much less interest. Most savings accounts currently pay between 0.01 and 0.5 percent annually, while CDs pay 4 to 5.5 percent depending on the term. The trade-off is access: you can withdraw from savings anytime without penalty.

A money market account sits between the two. It typically pays more than a savings account but less than a CD, and it gives you limited check-writing or withdrawal privileges. Money market accounts are useful if you want better returns than savings but need some access to your money.

If you have money you will not need for at least six months, a CD almost always beats a savings account. If you might need the money sooner, a savings account or money market account is safer because the penalty will not eat into your gains.

Frequently Asked Questions

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

No. A CD is a fixed contract for a fixed amount. Once you open it, you cannot deposit more money into that same CD. If you want to invest additional funds, you would need to open a separate CD. Some banks let you open multiple CDs at different times or with different terms.

What if I need my money before the CD matures?

You can withdraw it, but you will pay the early withdrawal penalty specified in your CD's terms. This penalty is usually several months of interest. Before opening a CD, make sure the money you deposit is money you genuinely will not need during the term, or choose a no-penalty CD even though it pays less interest.

Are CDs safe if the bank fails?

Yes. The FDIC insures deposits up to $250,000 per depositor per bank. If your bank fails, the FDIC will return your money. Credit union CDs are insured the same way by the NCUA. Always verify your bank or credit union is insured before opening a CD.

Do I pay taxes on CD interest?

Yes. CD interest is taxable income in the year it is earned. 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. Some people open CDs in tax-advantaged retirement accounts like IRAs to defer taxes, but that is a separate decision.

Should I ladder my CDs?

CD laddering means opening multiple CDs with different maturity dates so that one matures every few months or years. This gives you regular access to portions of your money and lets you take advantage of changing interest rates without locking everything away for years. It is a strategy worth considering if you have a large amount to invest.