Most CDs don't let you add money once you've opened them
When you open a certificate of deposit (CD), you deposit a lump sum of money and agree to leave it untouched for a set period—usually three months to five years. That money is locked in at a fixed interest rate. Most banks and credit unions do not allow you to deposit additional funds into that same CD after the account opens. If you want to add more money, you'll need to open a separate CD.
This is different from a savings account, where you can deposit money whenever you want. CDs work the opposite way: the bank needs to know exactly how much money you're committing to and for how long, so it can lend that money out or invest it. Letting you add funds partway through would break that agreement.
Key Takeaways
- Standard CDs lock in your deposit amount when you open the account, and most banks will not let you add more money to that specific CD.
- If you want to deposit additional funds, you can open a second CD with a new deposit and a new maturity date.
- Some banks offer add-on CDs or flexible CDs that do allow deposits during the term, but these are less common and may have lower interest rates.
- Trying to add money to a standard CD without permission may result in the deposit being rejected or placed in a different account.
What happens if you try to deposit money into an open CD
If you attempt to add funds to a CD that doesn't allow it, the bank will typically reject the deposit or move it to a different account—usually a linked savings account or checking account. The money won't go into the CD itself, and you won't earn the CD's interest rate on it.
Some banks will notify you that the deposit was rejected or redirected. Others may process it silently into another account, so you need to check your account statements to see where the money actually went. This is why it's important to understand your CD's terms before you deposit money.
Opening a second CD if you have more money to save
The straightforward way to save additional money in a CD is to open a new one. You can open as many CDs as you want at the same bank or at different banks. Each CD will have its own deposit amount, interest rate, and maturity date.
This approach actually gives you flexibility. If you have $5,000 in one CD maturing in two years and another $3,000 to save now, you can open a second CD with the $3,000 at today's rates. When the first CD matures, you can decide whether to renew it, open a new one, or move the money elsewhere. Spreading your deposits across multiple CDs with different maturity dates is called CD laddering, and it's a common strategy for managing your savings.
Add-on CDs and flexible CDs: the exceptions
Some banks offer variations on the standard CD that do allow additional deposits. These go by names like add-on CDs, flexible CDs, or bump-up CDs. With an add-on CD, you can deposit extra money during the CD's term, usually up to a maximum amount the bank sets. The additional deposits typically earn the same interest rate as your original deposit.
The trade-off is that add-on CDs often pay a lower interest rate than standard CDs at the same bank. If you think you'll have money to add partway through the term, compare the rate on an add-on CD against opening multiple standard CDs. The math might favor the standard CD route even if it requires more accounts.
Ask your bank directly whether they offer add-on CDs and what the terms are. Not all banks do, and availability varies by location and account type.
Early withdrawal penalties if you need the money back
If you deposit money into a CD and then realize you need it before the maturity date, you'll face an early withdrawal penalty. This penalty is a fee the bank charges for breaking the CD agreement early. The penalty amount varies by bank and by CD term—a longer CD usually has a larger penalty.
Penalties are typically calculated as a certain number of months' worth of interest. For example, a bank might charge three months of interest as a penalty on a one-year CD. On a $10,000 CD earning 4% annually, that would be roughly $100. Some banks calculate penalties differently, so read the disclosure document before you open the CD.
This is another reason to be sure about the amount you deposit: once the money is in, taking it out early costs you. If you're uncertain whether you'll need the funds, a regular savings account with no withdrawal restrictions might be a better choice.
How to plan your CD deposits before opening the account
Before you open a CD, think about how much money you can afford to lock away for the entire term. This is the amount you should deposit on day one. If you think you might have extra money to save during the CD's term, plan to open a separate CD at that time instead.
Check the CD's terms and conditions document—sometimes called a "disclosure" or "rate sheet"—to confirm whether additional deposits are allowed. The document will also spell out the early withdrawal penalty, the interest rate, and the maturity date. Don't rely on a phone call or a conversation with a teller; get it in writing.
If you're saving toward a specific goal and you're not sure how much you'll need, a high-yield savings account might work better than a CD. You can deposit and withdraw money freely, and rates on savings accounts are competitive with CD rates at many banks right now.
Frequently Asked Questions
Can I move money from my savings account into my CD?
No. Once a CD is open, you cannot move money into it from another account. You would need to open a new CD with a separate deposit. If you try to transfer funds into an open CD, the bank will reject the transfer or move it to a different account.
What if my bank offers add-on CDs but I already opened a standard CD?
You cannot convert a standard CD to an add-on CD mid-term. You would need to withdraw the money early (and pay the penalty) or wait until the CD matures. At maturity, you can choose to open an add-on CD instead if the rate is competitive.
If I open two CDs at the same bank on the same day, do they have the same interest rate?
Yes, they will have the same rate if they are the same type of CD with the same term length. However, each CD is a separate account with its own maturity date. If you open them on different days, the rates might differ because CD rates change frequently.
Can I add money to a CD if I'm the account owner and someone else is a joint owner?
No. The restriction on adding money applies regardless of who owns the account. Joint ownership does not change the CD's terms. Both owners would need to agree to open a new CD if additional funds need to be saved.
What happens to my CD if I don't have enough money to cover a fee?
If your bank charges a monthly maintenance fee and your CD balance drops below the minimum, the bank will deduct the fee from your CD balance. This reduces the amount earning interest. Most CDs have no monthly fees, but check your account terms to be sure.