How to buy a CD: the basic steps

You open a CD account at a bank or credit union, deposit a lump sum of money, agree to leave it untouched for a set period (called the term), and receive a fixed interest rate in return. The bank pays you that rate for the entire term, regardless of whether market rates rise or fall. When the term ends, you get your principal back plus the interest earned.

The process itself takes minutes. You choose a bank or credit union, pick a CD term (typically three months to five years), decide how much to deposit, and complete an account application. Most banks let you open a CD online without visiting a branch. You'll need a valid ID, Social Security number, and a way to fund the account—usually a bank transfer from another account you own.

The key difference between a CD and a regular savings account is the commitment. You agree not to withdraw the money before the term ends. If you do withdraw early, the bank charges a penalty, usually a certain number of months' worth of interest. That penalty is the price of breaking the contract.

Key Takeaways

  • You can open a CD at any bank or credit union that offers them, online or in person, by providing ID, a Social Security number, and an initial deposit.
  • CD terms range from three months to five years or longer, and the interest rate is locked in for the entire term regardless of market changes.
  • Early withdrawal penalties are real costs—usually several months of interest—so only deposit money you won't need before the term ends.
  • FDIC insurance at banks and NCUA insurance at credit unions protect your deposit up to $250,000, so the principal itself is safe even if the institution fails.
  • Shopping rates across multiple banks matters because CD rates vary significantly, and a higher rate at one bank can add hundreds of dollars over the term.

Where to open a CD

You can open a CD at any bank or credit union. National banks like Chase, Bank of America, and Wells Fargo offer them. Regional and local banks often do too. Credit unions, which are member-owned and typically offer competitive rates, also sell CDs. Online banks—institutions with no physical branches—frequently offer higher rates than brick-and-mortar banks because they have lower overhead costs.

The choice between a traditional bank and an online bank comes down to convenience and rate. A traditional bank lets you walk in and speak to someone, which some people prefer. An online bank requires you to manage everything by phone, email, or website, but often pays more interest. Both are equally safe as long as they carry FDIC insurance (banks) or NCUA insurance (credit unions).

You don't have to use your existing bank. Many people shop around and open a CD at whichever institution offers the best rate for their chosen term. There's no penalty for opening multiple CDs at different banks, and doing so is a normal way to maximize your return.

Choosing a CD term and deposit amount

CD terms range from as short as three months to as long as ten years, though three months to five years are most common. Shorter terms mean you get your money back sooner and can reinvest it if rates have risen. Longer terms lock in a higher rate but commit your money for years.

The deposit amount is entirely up to you. Some banks have minimums—often $500 to $2,500—but many online banks have no minimum at all. You can open a CD with $100 or $100,000. The only constraint is that FDIC or NCUA insurance covers up to $250,000 per depositor per bank. If you're depositing more than that, split it across multiple banks to stay fully insured.

Think about when you'll need the money. If you know you'll need $5,000 in two years, a two-year CD is a natural fit. If you might need it sooner, a shorter term or a regular savings account is safer because the early withdrawal penalty will cost you less. If you're certain you won't touch it for five years, a five-year CD locks in a higher rate and removes the temptation to break the agreement early.

Understanding CD rates and how they're quoted

Banks advertise CD rates as an Annual Percentage Yield (APY), which is the total return you'll earn in one year if you leave the money untouched. A CD with a 4.5% APY means that if you deposit $10,000 for one year, you'll earn $450 in interest (before taxes).

For terms longer than one year, the math is straightforward: multiply your deposit by the APY and the number of years. A $10,000 deposit at 4.5% APY for two years earns roughly $900 in total interest (the actual amount is slightly higher because of compounding, but the difference is small). For terms shorter than one year, the bank calculates a proportional amount.

CD rates change constantly and vary widely between banks. On any given day, one bank might offer 4.5% for a one-year CD while another offers 4.0%. Over the course of the term, that 0.5% difference adds up. On a $10,000 CD, it's $50 per year. Shopping rates across at least three or four banks before you commit is worth the time.

The early withdrawal penalty and when it applies

If you withdraw money from a CD before the term ends, the bank charges a penalty. The penalty is usually expressed as a number of months of interest. A "three-month penalty" on a $10,000 CD earning 4.5% APY costs you roughly $112.50 (three months' worth of the interest you would have earned).

The penalty is deducted from your interest earnings first. If you've earned less interest than the penalty costs, the bank takes the difference from your principal. For example, if you withdraw after two months on a three-month penalty CD, you've earned only $75 in interest but owe a $112.50 penalty. The bank pays you your $10,000 principal minus the $37.50 difference.

Some banks offer no-penalty CDs, which let you withdraw early without a charge. The trade-off is a lower interest rate. A no-penalty CD might pay 3.5% while a standard CD pays 4.5%. The lower rate is the bank's way of compensating for the flexibility you're getting. No-penalty CDs make sense if you're not certain you can leave the money alone for the full term.

How interest is paid and compounding

Interest on a CD is usually paid monthly, quarterly, or at the end of the term, depending on the bank. Some banks add the interest to your CD balance (called compounding), so you earn interest on your interest. Others pay it to a linked savings account.

Compounding works in your favor. If your $10,000 CD earns 4.5% APY and compounds monthly, the first month you earn about $37.50. That gets added to your balance, making it $10,037.50. The next month you earn interest on $10,037.50, not just the original $10,000. Over a full year, compounding adds a small but real boost to your return.

The difference between monthly and annual compounding is small on CDs—usually a few dollars on a typical deposit. But if you're comparing two CDs with similar rates, the one that compounds more frequently will pay slightly more.

What happens when your CD matures

When the term ends, your CD matures. The bank notifies you (usually by email or mail) and gives you a window—often 10 days—to decide what to do next. You can withdraw the money, open a new CD at the same bank, or move it elsewhere.

If you don't act during that window, many banks automatically renew your CD into a new term at the current rate. This is convenient if you want to keep the money in a CD, but the new rate might be lower than what you had before. It's worth checking the renewal rate and shopping other banks before the renewal happens. If the rate has dropped significantly, you might prefer to move your money.

Some banks charge a fee to close a CD after it matures, though this is uncommon. Check the terms before you open the account so you know what to expect.

Tax considerations and reporting

CD interest is taxable income. The bank reports it to the IRS on a Form 1099-INT, and you report it on your tax return. You owe federal income tax on the interest at your ordinary income tax rate, plus state and local taxes if your state taxes interest income.

This matters because it reduces your actual return. A CD earning 4.5% APY might net you only 3% or 3.5% after taxes, depending on your tax bracket. If you're in a high tax bracket, this is worth considering when comparing a CD to other investments.

If you withdraw early and pay a penalty, you can deduct the penalty from your taxable interest income. For example, if you earned $500 in interest but paid a $150 penalty, you report only $350 as taxable income. This small silver lining doesn't make early withdrawal worthwhile, but it does reduce the tax hit.

Frequently Asked Questions

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

No. A CD is a fixed contract. You deposit a lump sum at the start, and that amount stays the same for the entire term. If you want to invest more money, you open a separate CD. Some banks let you open multiple CDs at once with different terms, which is a strategy called CD laddering.

What's the difference between a CD and a money market account?

A money market account is a hybrid between a checking account and a savings account. It usually pays higher interest than a regular savings account but lower than a CD, and you can withdraw money anytime without penalty. A CD pays more but locks your money away. Choose a CD if you're certain you won't need the money; choose a money market account if you want flexibility.

Is my money safe in a CD if the bank fails?

Yes. FDIC insurance (at banks) and NCUA insurance (at credit unions) protect your CD deposit up to $250,000. If the bank fails, the insurance agency pays you back in full. This protection covers the principal and all accrued interest. Make sure your bank displays the FDIC or NCUA logo before you open an account.

Should I open a CD if interest rates are expected to rise?

If you believe rates will rise significantly, a shorter-term CD lets you reinvest at a higher rate sooner. A one-year CD matures in a year, and you can then open a new one at whatever the rate is then. A five-year CD locks you in for five years, so you miss out if rates climb. However, if you need the money to stay safe and earning something, a CD is still worth it even if rates rise later.

Can I use a CD as collateral for a loan?

Yes. Some banks let you borrow against your CD balance at a lower interest rate than an unsecured loan. The bank holds the CD as collateral, so if you don't repay the loan, they keep the CD funds. This is useful if you need cash but don't want to pay an early withdrawal penalty. Ask your bank whether they offer CD-secured loans.