Opening a CD is one of the simpler financial moves you can make, but a few practical questions tend to come up before you get started. How much money do you actually need? Can you add to it later? What do you need to decide before you commit?

This guide walks through all of that so you know exactly what to expect before you open one.

What Is the Minimum Deposit for a CD?

Most CDs require a minimum deposit of $500 to $2,500 to open, according to Experian, though the exact amount depends on the bank and the specific CD product.

Here’s a look at minimum deposits at a few major banks:

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• U.S. Bank: $500 for a Standard CD, $1,000 for a CD Special
• Regions Bank: $2,500 for terms of 7 to 89 days, $500 for terms of 90 days or longer
• Jeanne D’Arc Credit Union: $250

Some CDs require more. Jumbo CDs typically start at $100,000, and some specialty CDs, like certain bump-up or step-up products, may require $1,000 or more.

There’s a general pattern worth noting: CDs with higher yields often have higher minimum deposit requirements. Banks incentivize larger deposits because they give banks more capital to work with, which is part of why jumbo CDs traditionally paid more.

That said, the minimum deposit doesn’t necessarily determine which CD offers the best rate. Plenty of competitive rates are available at low or no minimum, which is exactly what the next section covers.

CDs With No Minimum Deposit

You don’t need a large sum to open a CD. Several well-known online banks let you open one with $0 down and fund it whenever you’re ready.

Bank	Minimum Deposit
Capital One	$0
Ally Bank	$0
Synchrony Bank	$0
Barclays	$0
E*TRADE	$0
American Express	$0
Discover	$0
Marcus by Goldman Sachs	$500
CFG Bank	$500
Quontic Bank	$500

Capital One, Ally Bank, Synchrony Bank, Barclays, E*TRADE, American Express, and Discover are all currently offering CDs with no minimum deposit requirement. A few others, like Marcus by Goldman Sachs and Quontic Bank, keep the bar low at $500.

The absence of a minimum doesn’t mean the rates are worse either. Several of these banks, including Synchrony and E*TRADE, currently offer some of the best CD rates across multiple terms. That means you’re not sacrificing yield in exchange for accessibility.

If a minimum deposit has been holding you back from opening a CD, it’s worth checking whether one of these no-minimum options fits your needs before assuming you need to save up first.

Can I Open a CD With a Small Amount of Money?

Yes. Between the no-minimum banks covered above and the low minimums at plenty of others, you don’t need much to get started. If you have even $25 or $50 to set aside, there’s a CD out there you can open today.

That said, it’s worth thinking about whether a small CD makes sense for your situation before you open one.

• The interest earned on a small balance is modest. A $100 deposit at 4% APY earns you $4 over a year. That’s not nothing, but it’s not going to move the needle much either. If you’re working with a small amount, opening a CD is more about building the habit and locking in a rate than about generating meaningful income right away.
• Early withdrawal penalties matter more on tiny balances. A 90-day interest penalty is a bigger relative hit on a $200 CD than on a $20,000 CD. If there’s a real chance you’ll need the money before the term ends, a high-yield savings account might make more sense until your balance grows.
• Consider starting with a shorter term. If you’re not sure how the CD experience will fit your habits, a 3- or 6-month CD with a small deposit is a low-risk way to try it out before committing to a longer term or a larger sum.

The honest takeaway: there’s no minimum amount that makes a CD “worth it.” If the rate is good and you don’t need the money during the term, even a small deposit is a reasonable way to put cash to work instead of letting it sit in a checking account earning nothing.

Can I Add Money to a CD After I Open It?

In most cases, no. A standard CD is a one-time deposit. Once you fund it, that’s your balance for the entire term. If you come into more money later and want to save it, you’d typically need to open a new CD rather than add to the existing one.

There is an exception worth knowing about: add-on CDs.

Add-On CDs

An add-on CD is a specific type of CD that allows additional deposits during the term, usually with some restrictions. Banks that offer them often set a minimum for each additional deposit, like $25 or $100, and may cap how many additional deposits you can make or how much you can add in total.

Add-on CDs are less common than standard CDs, and the rates are sometimes slightly lower to account for the added flexibility. If the ability to keep contributing matters to you, like if you’re building up savings gradually rather than depositing a lump sum, it’s worth specifically searching for a bank that offers this feature rather than assuming a standard CD will work.

What to Do Instead if You Can’t Add to Your CD

If your CD doesn’t allow additional deposits and you want to keep saving, a few options work well:

• Open a second CD. There’s no rule against having multiple CDs, even at the same bank. Opening a new one each time you have money to set aside is a completely normal approach.
• Use a high-yield savings account for ongoing contributions. Keep building your savings there, then open a new CD or add to a CD ladder once you’ve accumulated a meaningful amount.

Build a CD ladder. If you plan to be depositing money regularly, a CD ladder lets you open new CDs on a recurring basis while keeping your money working at competitive rates. For a full breakdown, check out our guide on what is a CD ladder.

What to Decide Before You Open a CD

Once you know how much you’re depositing, a few more factors determine which CD is the right fit.

Choose Your Term

CD terms typically range from 3 months to 5 years. Shorter terms give you access to your money sooner but often pay less. Longer terms usually pay more but lock your money up longer. Think through when you’ll realistically need the money, and choose a term that matches. If you’re not sure, a shorter term or a CD ladder gives you more flexibility to adjust as rates change.

Compare Rates Across Institutions

Don’t default to your current bank out of convenience. The gap between the national average and the best available rate is significant, often several percentage points. Our best CD rates page is updated regularly and is a good place to start comparing.

Understand the Early Withdrawal Penalty

Before you commit, know exactly what it costs to break the CD early. Penalties are usually calculated as a set number of days or months of interest, and they vary by bank and term length. For a full breakdown, check out our guide to CD early withdrawal penalties.

Decide if You Want Flexibility Built In

If there’s a real chance you’ll need the money early, a no-penalty CD might be worth the slightly lower rate. If you want the possibility of a higher rate if rates rise, a bump-up or step-up CD is worth a look.

Check What Happens at Maturity

Most CDs auto-renew if you don’t take action within the grace period, typically 7 to 10 days after maturity. Know your bank’s specific policy so you’re not caught off guard.

Confirm FDIC or NCUA Insurance

Any CD at a federally insured bank or credit union is covered up to $250,000 per depositor, per account category. It takes less than a minute to verify.

Step-by-Step: How to Open a CD

Once you’ve made your decisions, actually opening the account is quick, usually 15 minutes or less if you’re doing it online.

1. Choose Your Bank and CD

Based on your comparison of rates, terms, and minimum deposits, pick the specific CD you want to open.

2. Gather Your Information

Most banks will ask for a government-issued ID, your Social Security number, and your date of birth.

3. Provide Your Funding Source

You’ll need your bank account and routing number to transfer your initial deposit, whether that’s from an existing checking or savings account.

4. Complete the Application

Online applications typically take about 10 to 15 minutes. You’ll confirm your term, deposit amount, and how you want interest paid, either compounded within the CD or paid out to another account periodically.

5. Fund the Account

Depending on the bank, this happens automatically as part of the application or within a few business days after you apply. Some banks give you a short window, often 10 days, to fund the account while still locking in the rate available on the day you applied.

6. Save Your Confirmation Details

Keep a record of your maturity date, your rate, and your bank’s grace period policy. Setting a calendar reminder a week or 2 before maturity helps you avoid an automatic renewal you didn’t intend.

The Bottom Line

Opening a CD doesn’t require as much money or effort as people sometimes assume. Most banks ask for $500 to $2,500 to get started, and several competitive online banks don’t require a minimum deposit at all.

The bigger decisions come after you’ve figured out how much to deposit: choosing the right term, comparing rates across institutions, and understanding the early withdrawal penalty before you commit. Get those right, and the actual account opening takes about 15 minutes.

If you’re working with a smaller amount, don’t let that stop you. A modest CD is still a better home for idle cash than a checking account earning nothing, and it’s an easy way to start building the habit of locking in guaranteed returns.

Whenever you’re ready to compare options, our best CD rates page is a good place to start.