Opening a CD takes 15 minutes and requires an initial deposit, your Social Security number, and a choice of term length

To open a CD, you pick a bank or credit union, choose how long you want to lock your money away (the term), decide how much to deposit, and complete an application. Most banks let you start online without visiting a branch. You'll need your Social Security number, a valid ID, and proof of address (a recent utility bill or bank statement works). The bank verifies your identity, moves your money into the CD, and you're done—your rate is locked for the term you chose.

The deposit amount varies by institution. Some banks have minimums as low as $500; others require $1,000, $2,500, or more. A few online banks have no minimum at all. The term—how long your money stays locked—ranges from three months to five years or longer. Shorter terms come with lower rates; longer terms pay more. You pick the term that matches when you'll actually need the money.

Once the CD matures (the term ends), the bank sends you the principal plus interest. You can then withdraw it, roll it into a new CD at the current rate, or move it elsewhere. If you withdraw before maturity, you pay an early withdrawal penalty—usually a few months' worth of interest. That's the trade-off for locking in a may provide rate.

Key Takeaways

  • You can open a CD online in minutes with a deposit, your Social Security number, and a choice of term length.
  • Minimum deposits range from zero to $2,500 or more depending on the bank; online banks often have lower minimums than brick-and-mortar branches.
  • Your interest rate is locked for the entire term—three months to five years—and does not change even if rates rise or fall.
  • Withdrawing money before the term ends costs you an early withdrawal penalty, usually several months of interest.
  • When your CD matures, you can withdraw the money, open a new CD, or let it roll over automatically—check your bank's policy.

Where to open a CD: banks, credit unions, and online platforms

You can open a CD at a traditional bank, a credit union, or an online bank. Traditional banks (Chase, Bank of America, Wells Fargo) are convenient if you already have an account there, but their CD rates are often lower than online alternatives. Credit unions typically offer competitive rates to members; you must join the credit union first, which usually requires living or working in a specific area or having a family member who is a member.

Online banks (Marcus, Ally, American Express Bank) have no physical branches but offer higher rates because they have lower overhead costs. You never meet anyone in person—everything happens through their website or app. Opening takes the same 15 minutes, but you cannot deposit cash directly; you transfer money from another bank account. Online banks are FDIC-insured just like traditional banks, so your deposit is protected up to $250,000.

Credit unions are NCUA-insured (National Credit Union Administration) instead of FDIC-insured, but the protection is identical: $250,000 per account owner per institution. Shop rates across all three types—the difference between a 4% CD at a traditional bank and a 5% CD online adds up quickly on a large deposit.

Choosing a term length that matches your timeline

The term is how long your money is locked away. Common terms are three months, six months, one year, two years, three years, and five years. Longer terms pay higher rates because the bank can use your money for longer. A five-year CD might pay 4.5%, while a three-month CD might pay 3.8%. The trade-off is that you cannot touch the money without paying a penalty.

Pick a term based on when you actually need the money. If you're saving for a down payment in two years, a two-year CD makes sense. If you might need it sooner, a shorter term or a regular savings account is safer. If you're confident you won't touch it for five years, the higher rate on a five-year CD is worth it. Many people use a CD ladder—opening multiple CDs with different maturity dates so that money becomes available at regular intervals without locking everything away for years.

Some banks offer no-penalty CDs, which let you withdraw early without a penalty, though the rate is usually lower than a standard CD. These are worth considering if you're uncertain about your timeline.

What happens to your money during the term

Once your CD opens, your money earns interest on a fixed schedule. Interest compounds—meaning you earn interest on your interest—either daily, monthly, or quarterly depending on the bank. The bank adds the accrued interest to your balance automatically. You do not have to do anything; the money just grows.

You cannot withdraw or add money to a CD during the term without triggering the early withdrawal penalty. Some banks allow you to view your balance online, but you cannot touch it. This is the whole point of a CD: you commit to leaving the money alone in exchange for a may provide rate.

When the term ends, the bank notifies you (usually by email or mail) that the CD has matured. At that point, you have options: withdraw the money, open a new CD, or let it roll over automatically into a new CD at the current rate. Check your bank's policy on auto-renewal before opening—some banks roll over by default, and if rates have dropped, you might not want that.

Understanding early withdrawal penalties and what they cost

If you need your money before the term ends, you pay an early withdrawal penalty. The penalty is usually expressed as a number of months' interest. A CD with a three-month penalty means you lose three months' worth of the interest you've earned. On a $10,000 CD earning 4% annually, that's roughly $10 in lost interest. On a $100,000 CD, it's roughly $100.

Some banks calculate the penalty differently—as a percentage of the principal or a flat fee. Always ask the bank what the penalty is before you open the CD. It's usually listed in the account agreement or on the product page. A penalty that seems small on a $1,000 CD can be significant on a $50,000 deposit.

The penalty comes out of your interest, not your principal, as long as you've earned enough interest. If you withdraw very early and haven't earned enough interest to cover the penalty, the bank deducts it from your principal instead. This is rare, but it's why knowing the penalty matters.

The application process: what you need and how long it takes

To open a CD, gather your Social Security number, a valid government-issued ID (driver's license or passport), and proof of address (a recent utility bill, bank statement, or lease). Online banks may ask for a photo of your ID and a selfie to verify your identity. This takes a few minutes.

Fill out the bank's application, which asks for your name, address, date of birth, and Social Security number. You'll also choose your deposit amount and term length. Then you transfer money from another bank account (if opening online) or deposit cash (if opening at a branch). The bank verifies your identity and your funds, and the CD opens—usually within one business day.

If you're opening at a branch, bring your ID and proof of address in person. The banker walks you through the choices, takes your deposit, and opens the account on the spot. Online applications take longer only if the bank needs to verify your identity by phone or mail, which is rare.

What to do when your CD matures

When the term ends, you have three choices: withdraw the money, open a new CD, or let it roll over. If you do nothing, many banks automatically roll the CD over into a new one at the current rate. This is convenient if rates have stayed the same or risen, but if rates have fallen, you might not want to lock in a lower rate. Check your bank's auto-renewal policy and set a reminder for the maturity date so you can decide before it happens.

If you want to withdraw, the bank transfers the money (principal plus all interest earned) back to the account you originally funded it from, or to a new account you specify. This takes one to three business days. If you want to open a new CD, you can do so immediately at the current rate, which may be higher or lower than what you just earned.

Some people use maturity as a checkpoint: they withdraw the money, reassess their financial goals, and decide whether a CD is still the right move. Others open a new CD right away to keep the money locked in. There's no penalty for any of these choices once the term has ended.

Frequently Asked Questions

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

No. A CD is a fixed deposit—you cannot add or withdraw money during the term without paying an early withdrawal penalty. If you want to save more, open a separate CD or use a regular savings account for additional deposits.

What if I need the money before the CD matures?

You can withdraw it, but you'll pay an early withdrawal penalty, usually a few months' worth of interest. The penalty amount varies by bank and term length. Check the penalty before opening so you know what it will cost if an emergency happens.

Is my money safe in a CD?

Yes. CDs at FDIC-insured banks and NCUA-insured credit unions are protected up to $250,000 per account owner per institution. The bank cannot lose your money or go bankrupt and leave you with nothing—the insurance covers it.

Do I have to pay taxes on CD interest?

Yes. The interest you earn on a CD is taxable income. The bank sends you a 1099-INT form at tax time reporting how much interest you earned. You report this on your tax return.

What if rates go up after I open my CD?

Your rate stays locked for the entire term—it does not change even if rates rise. This is the trade-off: you get certainty, but you miss out if rates go higher. If rates fall, you benefit because your rate stays the same.