A certificate of deposit is a savings account where you lock your money away for a set time in exchange for a fixed interest rate

When you open a CD, you give a bank or credit union a lump sum of money. They promise to hold it untouched for a specific period — anywhere from a few months to five years or longer — and pay you a set interest rate on top of what you deposit. At the end of that period, called the maturity date, you get your original money back plus the interest earned. The tradeoff is straightforward: you cannot touch the money before maturity without paying a penalty, usually a loss of some or all of the interest you would have earned.

CDs are different from regular savings accounts because the interest rate does not change. A savings account rate can drop at any time, but a CD rate stays the same for the entire term you choose. This predictability is why people use CDs when they know they will not need money for a while and want to know exactly how much they will have at the end.

Key Takeaways

  • You deposit a fixed amount of money for a fixed time period and receive a fixed interest rate that does not change, no matter what happens to market rates.
  • Early withdrawal before the maturity date triggers a penalty, typically a loss of interest or a percentage of your principal, depending on the bank's terms.
  • CD rates vary by bank, credit union, term length, and deposit amount, so comparing offers across institutions can mean hundreds of dollars in difference.
  • The Federal Deposit Insurance Corporation (FDIC) insures CDs up to $250,000 per depositor per bank, and the National Credit Union Administration (NCUA) provides the same coverage at credit unions.

How interest rates and term lengths 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, while a five-year CD from the same bank might pay 5.2 percent. This is because the bank wants to use your money for longer and is willing to pay more for that privilege. However, this relationship is not may provide — rates depend on what the Federal Reserve does with its own rates, what other banks are offering, and how much money the bank needs to borrow.

Term lengths range from as short as one month to as long as ten years, though most banks offer the common options: three months, six months, one year, two years, three years, and five years. Some banks also offer "no-penalty CDs," which let you withdraw your money early without losing interest, but these typically pay lower rates than standard CDs because you have more flexibility.

The amount you deposit also affects the rate at times. Some banks offer higher rates on larger deposits — for example, $25,000 or more — while others pay the same rate regardless of deposit size. Always check the specific terms at the bank you are considering.

What happens if you need the money before maturity

Taking money out of a CD before the maturity date triggers an early withdrawal penalty. The size of this penalty varies widely by bank and by CD term. Some banks charge a flat fee — say, $25 or $50. Others charge a percentage of your deposit, such as 0.5 percent or 1 percent. Many banks calculate the penalty as a loss of interest — for example, three months' worth of interest, or six months' worth, depending on the term.

Before you open a CD, read the bank's disclosure document to find the exact penalty. A CD that pays 5 percent but charges six months of interest as a penalty might leave you with less money than you started with if you withdraw after just a few months. Some banks allow one penalty-free withdrawal during the CD term, but this is rare and always spelled out in the account agreement.

If you think you might need the money, a no-penalty CD or a high-yield savings account with no withdrawal restrictions might be a better fit, even if the rate is slightly lower.

FDIC and NCUA insurance protection

Money in a CD at an FDIC-insured bank is protected up to $250,000 per depositor per bank. This means if the bank fails, you will get your deposit and accrued interest back, up to that limit. Credit unions offer the same protection through the NCUA, also up to $250,000 per member per credit union.

If you have more than $250,000 to deposit, you can spread it 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 protected. The FDIC website has a tool to help you calculate your coverage based on how your accounts are titled and registered.

This insurance applies whether the CD is in your name alone, held jointly with someone else, or in a trust. The rules are specific, so if you have a complex account structure, check the FDIC or NCUA website to confirm your coverage before depositing.

Comparing CD rates across banks and credit unions

CD rates change constantly and vary significantly by institution. A CD paying 4.75 percent at one bank might pay 5.25 percent at another, and that difference compounds over time. On a $10,000 deposit over five years, the difference between 4.75 percent and 5.25 percent is roughly $260 in additional interest.

Online banks and credit unions often pay higher rates than brick-and-mortar banks because they have lower overhead costs. However, some local banks and credit unions offer competitive rates too, especially if you are a member or customer. Websites that aggregate CD rates from multiple banks can help you see what is available, though rates change daily and the offers shown may not be current by the time you explore.

When comparing, make sure you are looking at the same term length and deposit amount. A five-year CD rate is not comparable to a one-year rate. Also check whether the rate is fixed for the entire term or if it steps up — some CDs pay a lower rate for the first year and a higher rate for the remaining years.

Tax treatment of CD interest

Interest earned on a CD is taxable income in the year it is earned, even if you do not withdraw it until the CD matures. The bank will send you a 1099-INT form by January 31 of the following year showing how much interest you earned. You report this on your federal tax return.

If you hold a CD in a tax-advantaged account like a traditional IRA or Roth IRA, the interest is not taxed until you withdraw money from the account (or in the case of a Roth, may never be taxed if you follow the rules). CDs held in regular taxable accounts are subject to federal income tax, and possibly state and local income tax depending on where you live.

The tax impact matters most on larger CDs or longer terms. A $50,000 CD earning 5 percent over five years generates $12,763 in interest, and you owe income tax on that amount even though you cannot touch the principal until maturity.

CD ladders and other strategies

A CD ladder is a strategy where you buy multiple CDs with different maturity dates. For example, you might buy five $10,000 CDs with one-year, two-year, three-year, four-year, and five-year terms. Each year, one CD matures and you can either withdraw the money or reinvest it in a new five-year CD. This gives you access to some of your money every year while still locking most of it away for longer periods at higher rates.

Another approach is a CD bump-up or raise-your-rate CD, offered by some banks. These let you request a rate increase once during the CD term if rates rise. This protects you if you locked in at a lower rate and the bank's rates go up. However, bump-up CDs typically pay slightly lower starting rates than standard CDs, so the benefit may not be worth it depending on the difference.

Some people also use CDs as part of a bond ladder or broader investment strategy, mixing CDs with other savings vehicles to balance safety, liquidity, and returns. The right approach depends on when you need the money and what you are saving for.

Frequently Asked Questions

Can I move money from one CD to another without a penalty?

No. Moving money from one CD to another before maturity is treated as an early withdrawal and triggers the penalty. However, once a CD matures, you can move the money to a different bank or CD without penalty — you have a grace period, usually seven to ten days, to decide what to do with the funds.

What happens to my CD when it matures?

When a CD reaches its maturity date, the bank will either automatically renew it for another term at the current rate, or deposit the principal and interest into a linked savings or checking account. Check your account agreement to see what your bank does by default. You can usually change this setting or contact the bank to specify what you want.

Is a CD a good place to put an emergency fund?

A CD is not ideal for emergency money because you cannot access it without paying a penalty. A high-yield savings account offers nearly the same interest rate with no withdrawal restrictions, making it better for money you might need quickly. CDs work better for money you know you will not need for a specific period.

Do CD rates ever go down after I open one?

No. Once you open a CD, your rate is locked in for the entire term. Even if the bank lowers its rates the next day, your rate stays the same. This is one of the main reasons people choose CDs — the certainty that the rate will not change.

Can I open a CD in a retirement account?

Yes. Banks and credit unions offer CDs within traditional IRAs, Roth IRAs, and other retirement accounts. The CD rules are the same, but the tax treatment follows the retirement account rules. Withdrawing from a CD inside an IRA before age 59½ may trigger both the CD penalty and the IRA early withdrawal penalty, so this is a strategy only for money you plan to leave untouched until retirement.