CD amounts start at $500 to $2,500 at most banks, but some online banks accept $100

A Certificate of Deposit is not a product with one fixed price. Instead, you choose how much money to deposit, and that amount determines what you own. Most traditional banks require a minimum deposit between $500 and $2,500 to open a CD. Online banks often accept smaller amounts — sometimes as little as $100 or $250. A few banks have no minimum at all.

The money you deposit is yours. You are not buying the CD; you are lending that money to the bank for a set period (called the term), and the bank pays you interest in return. When the term ends, you get your original deposit back plus the interest earned.

The amount you deposit does not change the interest rate the bank offers. A $500 CD and a $50,000 CD at the same bank, with the same term, earn the same percentage rate. The larger deposit straightforward earns more dollars in interest because the rate applies to a bigger balance.

Key Takeaways

  • Most banks require between $500 and $2,500 to open a CD, though online banks often accept $100 or less.
  • You choose the deposit amount; it is not set by the bank, and it does not affect the interest rate you receive.
  • Your deposit is protected up to $250,000 per bank by the FDIC, so the amount you deposit determines how much protection you have.
  • Early withdrawal penalties vary by bank and by term length, so confirm the penalty before you deposit money you might need sooner.
  • Interest rates change daily, so the rate offered today will differ from the rate offered next week at the same bank.

How deposit size affects your FDIC protection

The Federal Deposit Insurance Corporation (FDIC) protects your CD deposit up to $250,000 per bank. This means if you deposit $10,000 in a CD and the bank fails, the FDIC returns your full $10,000 plus any interest earned up to the point of failure. If you deposit $300,000, the FDIC covers only $250,000 of it.

The $250,000 limit applies per bank, not per CD. If you have two CDs at the same bank totaling $300,000, only $250,000 is protected. If you have two CDs at different banks totaling $300,000, both are fully protected because each bank's deposits are insured separately.

This protection applies only to FDIC-insured banks. Credit unions use a similar system called the National Credit Union Administration (NCUA), which also covers up to $250,000 per institution. Online banks are FDIC-insured if they are chartered as banks, which most major ones are — you can verify this on the FDIC's website.

Why the deposit amount matters for your interest earnings

The interest you earn is calculated by multiplying your deposit by the annual percentage rate (APR) the bank offers. A $1,000 CD earning 4.5% APR for one year earns $45 in interest. A $10,000 CD at the same bank, same rate, same term earns $450. The rate stays the same; the dollar amount of interest scales with your deposit.

This is why deposit size affects your decision-making. If you have $5,000 to invest in a CD, you might split it between two banks to stay under the $250,000 FDIC limit per institution — though at $5,000 you are well below that threshold. More commonly, people with larger sums consider whether to open multiple CDs at different banks to maximize FDIC coverage while earning interest on the full amount.

Some people use a strategy called "CD laddering," where they deposit money in CDs with different term lengths at the same bank. A $10,000 ladder might be five $2,000 CDs maturing in one, two, three, four, and five years. As each one matures, you can reinvest it or withdraw it. This approach does not change the interest rate, but it gives you access to portions of your money at regular intervals.

Minimum deposits vary by bank and CD type

Traditional brick-and-mortar banks typically require $500 to $2,500 minimums. Credit unions often have similar requirements, though some accept $250. Online banks compete partly on lower minimums and commonly accept $100 or $250 deposits. A handful of online banks have no minimum deposit at all.

Some banks offer different minimums for different CD terms. A bank might require $500 for a three-month CD but $1,000 for a five-year CD. A few banks offer "no-penalty CDs" — CDs you can withdraw from early without a penalty — and these sometimes have higher minimums than standard CDs because the bank is taking on more risk.

If you have less than the minimum a bank requires, you have two options: deposit at a bank with a lower minimum, or wait until you have saved enough. There is no benefit to waiting for a specific bank if another bank offers the same rate with a lower minimum.

Early withdrawal penalties reduce what you get back

If you withdraw money from a CD before the term ends, the bank charges a penalty. The penalty is subtracted from your interest earnings or, if the penalty is large enough, from your original deposit. This is why the amount you deposit matters — you need to be confident you will not need that money before the CD matures.

Penalties vary widely. A three-month CD might have a penalty of one month's interest. A five-year CD might have a penalty of six months' interest or more. Some banks calculate the penalty as a percentage of the deposit. You must ask the bank for the exact penalty before you deposit money.

Example: You deposit $5,000 in a two-year CD earning 4% APR. The penalty is three months' interest. If you withdraw after one year, you lose $50 in interest (three months of the $200 annual interest). You receive $5,000 plus $150 in interest, for a total of $5,150. Your original deposit is not touched, but your earnings are reduced.

Interest rates change, so timing affects what you earn

Banks set CD rates daily based on market conditions. The rate offered on Monday may be different from the rate offered on Friday. This means the amount you earn depends partly on when you deposit your money, not just how much you deposit.

You cannot lock in a rate before you deposit. Once you hand over your money and the bank confirms the CD, the rate is set for the entire term. If rates drop the next day, you keep the higher rate. If rates rise, you are stuck with the lower rate. This is why some people watch CD rates for a few weeks before deciding to deposit.

The term length also affects the rate. A one-year CD typically earns less than a five-year CD at the same bank, because the bank is borrowing your money for a longer period and paying you for that commitment. Shorter terms are less predictable — rates can change week to week. Longer terms are more stable but lock your money away for years.

How to compare CDs across different deposit amounts

If you are deciding between banks or between different deposit amounts, focus on the annual percentage yield (APY), not the APR. APY accounts for compounding — how often the bank adds interest to your balance — and gives you the true annual return. A bank advertising 4.5% APR might actually yield 4.59% APY if interest compounds daily.

Most CD comparison websites let you filter by minimum deposit and term length. Enter the amount you plan to deposit and the term you want, and the site shows you which banks offer the best rates for that combination. Rates change daily, so a comparison from last week is not current.

Do not assume a bigger bank offers better rates. Online banks often pay higher rates than large national banks because they have lower overhead costs. A $1,000 deposit at an online bank earning 4.75% APY earns more than a $1,000 deposit at a national bank earning 4.0% APY, even though the national bank is more recognizable.

Frequently Asked Questions

Can I deposit less than the bank's minimum?

No. If a bank requires a $500 minimum, you must deposit at least $500 to open the CD. You cannot open a CD with $250 at that bank. You would need to find a different bank with a lower minimum or wait until you have saved $500.

Does a larger deposit earn a higher interest rate?

No. The interest rate is the same regardless of deposit size. A $500 CD and a $50,000 CD earn the same percentage rate at the same bank for the same term. The larger deposit earns more dollars in interest, but the rate itself does not change.

What happens if the bank fails and I have more than $250,000 in CDs?

The FDIC covers up to $250,000 per bank. If you have $300,000 in CDs at one bank, $250,000 is protected and $50,000 is not. To protect the full amount, split your CDs across multiple FDIC-insured banks so each bank holds no more than $250,000 of your money.

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

No. A CD is a fixed contract. You deposit a set amount, and that amount stays the same until the term ends. You cannot add money to an existing CD. If you want to invest more, you must open a separate CD.

Do I pay taxes on CD interest?

Yes. CD interest is taxable income in the year it is earned or credited to your account, depending on how the bank handles it. The bank sends you a 1099-INT form at tax time showing the interest you earned. You report this on your tax return.