What happens when you open a CD

A certificate of deposit is an agreement between you and a bank or credit union. You give them a sum of money—say $5,000—and they promise to hold it for a set period of time (called the term) and pay you interest on top of it. When the term ends, you get your original money back plus the interest earned. The catch: if you take the money out before the term ends, you pay a penalty.

The bank uses your money during that time to make loans or invest it. That's why they pay you interest—they're borrowing from you. The longer you agree to lock your money away, the higher the interest rate they typically offer. A 3-month CD pays less than a 12-month CD, which pays less than a 5-year CD.

You choose the term length when you open the account. Common terms are 3 months, 6 months, 1 year, 2 years, 3 years, and 5 years. Some banks offer terms as short as 1 month or as long as 10 years. The rate is fixed for the entire term—it won't go up or down, no matter what happens in the market.

Key Takeaways

  • You deposit a lump sum, choose a term length (3 months to 5 years is typical), and the bank locks that money in place while paying you a fixed interest rate.
  • The interest rate is higher the longer your term, because you're committing your money for a longer period.
  • When the term ends, the CD matures—you receive your original deposit plus all interest earned, usually automatically deposited into your linked account.
  • Withdrawing money before maturity triggers a early withdrawal penalty, which the bank deducts from your balance; the penalty amount varies by bank and term length.
  • CDs are FDIC-insured up to $250,000 per depositor per bank, so your money is protected even if the bank fails.

How interest accrues and compounds

The bank calculates your interest based on the rate they quoted you and the amount you deposited. Interest can be compounded daily, monthly, quarterly, or annually—meaning the bank adds earned interest back into your balance, and then calculates interest on that larger amount next time. Daily compounding pays you slightly more than annual compounding, because you earn interest on your interest more often.

You don't receive the interest as a separate payment during the term. It sits in the CD account and grows. When the CD matures, you get one lump sum: your original deposit plus all the interest that accumulated. Some banks let you choose to have interest paid out monthly or quarterly instead, but most CDs hold everything until maturity.

What happens when your CD matures

On the maturity date, your CD stops earning interest. The bank then moves your money into whatever account you designated when you opened the CD—usually a linked checking or savings account at the same bank. This happens automatically; you don't have to do anything.

You now have access to the full amount: your original deposit plus all interest. You can withdraw it, spend it, or move it to another bank. Some banks offer a grace period (usually 7 to 10 days after maturity) during which you can move the money without penalty. After that window closes, if you don't act, many banks automatically roll the money into a new CD with the same term and the current interest rate.

If you want to avoid an automatic rollover, contact your bank before the maturity date and tell them what you want to do with the money. This prevents you from being locked into a new CD at a lower rate if interest rates have dropped.

Early withdrawal penalties and when they apply

If you need the money before the maturity date, you can withdraw it, but the bank will charge a penalty. The penalty is usually expressed as a number of months of interest—for example, "3 months of interest" or "6 months of interest." On a $10,000 CD earning 4% annual interest, 3 months of interest is about $100, so your penalty would be $100.

The penalty amount depends on the term length and the bank's policy. Longer-term CDs typically have larger penalties. A 5-year CD might have a 12-month interest penalty, while a 3-month CD might have a 1-month penalty. Some banks use a flat dollar amount instead of months of interest.

The penalty is deducted from your balance. If you withdraw $5,000 from a CD with a $100 penalty, you receive $4,900. If your CD has only earned $50 in interest so far and you withdraw early, the bank deducts the full penalty from your principal, so you'd get back $4,950 (your $5,000 minus the $100 penalty, but the penalty is capped at your available balance in some cases—check your bank's terms).

CD laddering and managing multiple CDs

Some people open several CDs with different maturity dates to balance access to money with higher interest rates. This strategy is called CD laddering. For example, you might open five $2,000 CDs with 1-year, 2-year, 3-year, 4-year, and 5-year terms. Each year, one CD matures, giving you access to $2,000 without penalty. You can then withdraw it or roll it into a new 5-year CD, keeping the ladder going.

Laddering lets you take advantage of higher rates on longer terms while still having regular access to portions of your money. It requires planning and discipline, but it's a common approach for people saving for a goal over several years.

Comparing CD rates and terms across banks

Interest rates on CDs vary significantly by bank, term length, and the current economic environment. A 1-year CD at one bank might pay 4.5%, while another bank pays 4.75% for the same term. Over a year, that 0.25% difference adds up. On a $10,000 CD, 4.5% earns $450, while 4.75% earns $475—a $25 difference.

Online banks typically offer higher CD rates than brick-and-mortar banks, because they have lower overhead costs. Credit unions sometimes offer competitive rates too, especially if you're a member. Before opening a CD, check rates at several institutions. Websites that aggregate CD rates can help you compare, but always verify the current rate directly with the bank before depositing.

Also check the bank's early withdrawal penalty policy. A slightly higher rate doesn't matter if the penalty is so steep that you'd lose money if you needed to withdraw early. Read the CD agreement carefully—it will spell out the exact penalty and any grace periods.

Tax implications of CD interest

Interest earned on a CD is taxable income. The bank will send you a 1099-INT form at the end of the year showing how much interest you earned, and you'll report that on your tax return. You owe federal income tax on the interest, and possibly state income tax depending on where you live.

This matters most for high-rate CDs or large balances. A $50,000 CD earning 4.5% generates $2,250 in interest per year, which is taxable income. If you're in the 22% federal tax bracket, you'll owe about $495 in federal tax on that interest alone. Some people hold CDs in tax-advantaged accounts like IRAs to avoid this, though contribution limits apply to those accounts.

Frequently Asked Questions

Can I withdraw money from a CD before it matures?

Yes, but you'll pay an early withdrawal penalty. The penalty is typically several months of interest, deducted from your balance. The exact amount depends on your bank and the CD's term. Some banks offer a grace period of a few days after maturity during which you can withdraw without penalty.

What's the difference between a CD and a savings account?

A savings account lets you deposit and withdraw money anytime without penalty, but pays lower interest. A CD locks your money for a set term and pays higher interest, but charges a penalty if you withdraw early. CDs are better for money you won't need; savings accounts are better for emergency funds.

What happens if the bank fails while my money is in a CD?

Your CD is protected by FDIC insurance up to $250,000 per depositor per bank. If the bank fails, the FDIC takes over and ensures you get your full balance—principal plus accrued interest—even if the bank goes under. This protection applies to most banks; verify your bank is FDIC-insured before opening a CD.

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

If you think rates will rise soon, a short-term CD (3 or 6 months) lets you lock in a rate now and then move to a higher-rate CD when your term ends. A long-term CD locks you in at today's rate, so you'd miss out if rates climb. There's no way to predict rate movements, so consider your own timeline and need for access to money.

Can I move a CD to a different bank before it matures?

You can withdraw the money and move it, but you'll pay the early withdrawal penalty. It's usually not worth it unless the rate difference is substantial and the penalty is small. Some banks offer CD transfers or rollovers to other institutions, but this is rare—ask your bank if they offer this option.