A CD locks your money away for a set time in exchange for a may provide interest rate

A certificate of deposit (CD) is a savings product where you give a bank or credit union a lump sum of money and agree not to touch it for a fixed period — typically three months to five years. In return, the institution pays you a fixed interest rate, usually higher than what a regular savings account offers. You know exactly how much you will earn before you deposit a single dollar.

The trade-off is straightforward: access for growth. You cannot withdraw the money early without paying a penalty. That penalty is usually a chunk of the interest you earned, or sometimes a percentage of your principal. Because the bank knows your money will stay put, it can lend that money out with confidence and pay you more for the certainty.

Key Takeaways

  • You deposit a fixed amount, choose a term length (three months to five years), and receive a may provide interest rate for the entire term.
  • Early withdrawal triggers a penalty that typically costs you some or all of the interest earned, or a small percentage of your deposit.
  • Your CD matures on a set date, at which point you receive your principal plus all accrued interest, and can withdraw it penalty-free or roll it into a new CD.
  • CD rates vary by bank, term length, and deposit amount, so comparing rates across institutions can add hundreds of dollars to your earnings.
  • CDs are FDIC-insured up to $250,000 per depositor per bank, making them one of the safest places to store money that you will not need soon.

How the interest rate and term length work together

When you open a CD, you select two things: how long your money stays locked (the term) and what interest rate the bank offers for that term. A three-month CD might pay 4.50% annual percentage yield (APY), while a five-year CD from the same bank might pay 4.75% APY. Longer terms usually pay more because the bank has your money for longer and can plan further ahead.

The interest compounds — meaning you earn interest on your interest — according to how often the bank calculates it. Most banks compound daily or monthly. A $10,000 CD at 4.75% APY compounded daily will earn slightly more than one compounded monthly, though the difference is small. The APY figure already accounts for compounding, so you can compare rates directly without doing extra math.

When your CD reaches maturity (the end of the term), the bank stops paying interest. You then have a grace period, usually 7 to 10 days, to decide what to do: withdraw the money, or let it roll into a new CD at whatever rate the bank is currently offering. If you do nothing, many banks automatically roll you into a new CD at the current rate, which may be higher or lower than what you just earned.

What happens if you need the money before maturity

Early withdrawal penalties exist to discourage you from breaking the agreement. The penalty amount varies by bank and term length. A three-month CD might charge three months of interest; a five-year CD might charge one year of interest. Some banks use a flat dollar amount instead — say, $25 — which is usually only an option on very short terms.

The penalty comes out of your earnings first. If you earned $200 in interest and the penalty is $150, you walk away with $50 of your interest plus your full principal. If the penalty exceeds what you earned, it comes out of your principal instead, so you get back less than you deposited. This is why CDs work best for money you genuinely will not need until maturity.

A few banks offer "no-penalty CDs" that let you withdraw early without a penalty, but they pay lower interest rates to offset that flexibility. These are worth comparing to high-yield savings accounts, which also let you withdraw anytime but may pay similar rates.

Where to find CD rates and how they differ

CD rates change constantly and vary significantly between banks. A large national bank might offer 4.00% APY on a one-year CD, while an online bank offers 4.85% on the same term. Over one year, that 0.85% difference means $85 more per $10,000 deposited. Over five years, the gap widens.

Online banks and credit unions typically offer higher rates than brick-and-mortar banks because they have lower overhead costs. You can compare rates across institutions using financial websites that aggregate CD offerings, or by visiting each bank's website directly. The best rate available changes frequently, so if you are shopping, check multiple sources.

Some banks offer higher rates for larger deposits (called "jumbo CDs," usually $100,000 or more) or for longer terms. Others run promotions for new customers. Reading the fine print matters: confirm the APY, the term, the compounding frequency, and the early withdrawal penalty before you commit.

How CDs fit into a savings strategy

CDs work best for money you know you will not need for a specific period. If you are saving for a down payment due in three years, a three-year CD locks in the current rate and removes the temptation to spend the money. If you have an emergency fund already in place and extra cash sitting in a low-yield savings account, moving some of it to a CD can boost your earnings without taking on investment risk.

A common strategy is the "CD ladder," where you buy multiple CDs with different maturity dates — one that matures in one year, one in two years, one in three years, and so on. As each one matures, you can reinvest it in a new long-term CD. This spreads out your maturity dates so you are not locked into one rate for years, and it gives you regular access to portions of your money.

CDs are not meant to beat inflation over decades or to grow wealth aggressively. They are meant to earn more than a savings account while keeping your principal completely safe. They fit alongside emergency funds, short-term savings goals, and the stable portion of a diversified financial plan.

FDIC insurance and what it protects

CDs held at FDIC-insured banks are covered by federal deposit insurance up to $250,000 per depositor per bank. This means if the bank fails, the government guarantees you will get your money back, up to that limit. If you have $300,000 to deposit, you could split it across two banks ($250,000 each) to stay fully insured, or keep the extra $50,000 uninsured.

Credit unions offer similar protection through the National Credit Union Administration (NCUA), also up to $250,000 per member per institution. This insurance covers your principal and any accrued interest, so you do not lose earnings if something goes wrong with the institution.

This protection is one reason CDs are considered one of the safest places to store money. You are not taking on market risk or credit risk — the only risk is that you will need the money before maturity and have to pay a penalty.

Frequently Asked Questions

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

No. CDs are fixed-amount products. Once you open one, you cannot deposit additional funds into that same CD. If you want to save more, you would open a separate CD or use a savings account. Some banks let you open multiple CDs at the same time.

What is the difference between APY and interest rate?

The interest rate is the percentage the bank pays per year. APY (annual percentage yield) is the rate after accounting for how often interest compounds. APY is always equal to or slightly higher than the stated rate. When comparing CDs, always use APY, because it shows your true earnings.

Do I have to pay taxes on CD interest?

Yes. CD 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. This is one reason CDs in tax-advantaged accounts (like IRAs) can be useful.

What happens if interest rates drop after I buy a CD?

You keep your locked-in rate for the entire term. This is an advantage of CDs — if rates fall, you still earn what you agreed to. If rates rise, you are stuck with the lower rate until maturity, which is the downside.

Can I use a CD as collateral for a loan?

Yes. Some banks offer loans where your CD serves as collateral, so you can borrow against it without triggering the early withdrawal penalty. You pay interest on the loan, but your CD keeps earning its rate. This is useful if you need cash but want to keep your CD intact.