Banks and credit unions are your main options, and the choice depends on whether you want higher rates or lower fees
You can open a money market account at a traditional bank, an online bank, or a credit union. Traditional banks offer in-person service and established branch networks but typically pay lower interest rates. Online banks usually offer higher rates because they have lower overhead costs, but you cannot walk in to deposit cash or speak to someone face-to-face. Credit unions often split the difference—competitive rates and lower fees, but membership is restricted to people who meet their criteria (working in a certain field, living in a certain area, or belonging to an organization).
The account itself works the same way regardless of where you open it: you deposit money, earn interest, and can write checks or make transfers up to a limit each month. The real difference is in the rate you earn, the fees you pay, and how you prefer to bank.
Key Takeaways
- Online banks typically offer the highest interest rates because they have lower costs, but you cannot deposit cash in person.
- Traditional banks offer branch access and cash deposits but usually pay lower rates than online competitors.
- Credit unions may offer competitive rates and lower fees if you meet their membership requirements.
- Compare the interest rate, monthly fees, minimum balance requirements, and withdrawal limits before opening an account.
- You will need a government ID, Social Security number, and proof of address to open an account at any institution.
Online banks: highest rates, no branches
Online banks consistently offer the highest money market rates because they do not maintain physical branches or employ tellers. Banks like Marcus, Ally, and American Express Personal Savings are examples. You open the account entirely online, fund it by transferring money from another bank account, and manage everything through a website or mobile app.
The trade-off is that you cannot deposit cash directly into an online money market account. If you receive cash regularly, you would need to deposit it at an ATM that accepts cash (some online banks partner with ATM networks) or transfer it through another account first. Interest rates at online banks change frequently—currently ranging from 4% to 5.35% depending on the bank and market conditions, but these rates are not may provide and move with Federal Reserve decisions.
Online banks have no monthly maintenance fees at most institutions, though some charge fees if your balance falls below a minimum (often $2,500 to $25,000). Read the fee schedule carefully because a high rate means nothing if you pay $10 a month in fees.
Traditional banks: branch access, lower rates
Banks like Chase, Bank of America, Wells Fargo, and regional banks offer money market accounts at nearly every branch. You can walk in, deposit cash, speak to a banker, and handle everything in person. This matters if you prefer face-to-face service or deposit cash regularly.
The downside is that traditional banks pay significantly lower rates—often 0.01% to 1.5% depending on the bank and your balance. A $10,000 deposit earning 0.5% annually generates $50 in interest; the same deposit at an online bank earning 4.5% generates $450. Over time, that difference compounds. Traditional banks also charge monthly maintenance fees more often than online banks, typically $10 to $25 per month, though fees are usually waived if you maintain a high minimum balance (often $2,500 or more).
If you already bank at a traditional institution and value convenience over rate, opening a money market account there takes minutes. But if your goal is to earn meaningful interest, the rate difference is substantial enough to consider switching to an online option.
Credit unions: membership first, then competitive rates
Credit unions are member-owned financial institutions that often offer rates and fees competitive with online banks, plus the personal service of a traditional bank. Examples include Navy Federal Credit Union, Connexus Credit Union, and Pentagon Federal Credit Union, though thousands of smaller credit unions exist nationwide.
The catch is membership. You must meet the credit union's field of membership requirements—you might need to work for a specific employer, live in a certain county, belong to an organization, or have a family member who is already a member. Some credit unions have opened membership to anyone, but most have restrictions. Visit the credit union's website or call to confirm you are may be able to access before spending time on an application.
Once you are a member, money market accounts at credit unions typically offer rates between 3% and 5%, with lower or no monthly fees. Credit unions are insured by the National Credit Union Administration (NCUA) up to $250,000, the same protection that banks receive from the FDIC. If you meet the membership requirement, a credit union is often worth exploring.
What to compare before you open an account
| Factor | What to Look For |
|---|---|
| Interest Rate | The annual percentage yield (APY) paid on your balance. Rates change; check the current rate on the institution's website, not an old comparison article. |
| Monthly Fees | Most institutions charge $0 to $25 per month. Some waive fees if you maintain a minimum balance or set up direct deposit. |
| Minimum Balance | The amount you must keep in the account to earn the stated rate or avoid fees. Ranges from $0 to $25,000. |
| Withdrawal Limit | Money market accounts typically allow 6 withdrawals per month (federal regulation). Confirm the limit and what counts as a withdrawal. |
| Deposit Methods | Can you deposit cash, checks, or transfers? Online banks usually accept transfers and mobile check deposit but not cash. |
| Insurance | Confirm the account is FDIC-insured (banks) or NCUA-insured (credit unions) up to $250,000. |
Documents and information you will need to open an account
Every bank and credit union requires the same basic information to open an account: your full legal name, date of birth, Social Security number, and current address. You will need a government-issued photo ID (driver's license, passport, or state ID) to verify your identity.
Some institutions ask for proof of address—a recent utility bill, lease, or mortgage statement dated within the last 60 days. If you are opening an account online, you may be able to verify your address using information from a credit report instead. Have this information ready before you start the application to speed up the process.
If you are opening an account at a credit union, you may also need to prove you meet the membership requirement—an employee ID, proof of residence in the service area, or documentation of your relationship to a current member.
How to compare rates and open an account
Start by visiting the websites of 3 to 5 institutions you are considering. Look for the current APY on their money market account page—not a promotional rate, but the standard rate for new accounts. Write down the rate, monthly fee, and minimum balance for each. Calculate the annual cost: if the rate is 4.5% and the fee is $10 per month, your net return on a $10,000 deposit is roughly $450 minus $120 in fees, or $330.
Once you have narrowed your choices, open an account with the institution that offers the best combination of rate and fees for your situation. Most online banks let you complete the entire application in 10 to 15 minutes. Traditional banks and credit unions may ask you to visit a branch or complete additional verification steps. After you open the account, transfer your initial deposit from your existing bank account—this usually takes 1 to 3 business days.
You do not have to choose between online and traditional banking. Many people maintain a money market account at an online bank for the high rate and a checking account at a traditional bank for everyday use and cash deposits.
Frequently Asked Questions
Can I open a money market account online if I do not have an existing account at that bank?
Yes. Most online banks and many traditional banks let you open a money market account without having any other account with them. You will complete the application online, verify your identity, and fund the account by transferring money from another bank. The process typically takes 10 to 20 minutes.
What happens to my money if the bank fails?
Your money market account is insured by the FDIC (at banks) or NCUA (at credit unions) up to $250,000. If the institution fails, the insurance agency pays you the full balance of your account. This protection applies regardless of whether you bank online or in person.
Can I withdraw money from a money market account whenever I want?
Federal rules limit you to 6 withdrawals per month from a money market account. After 6 withdrawals, the bank may charge a fee, close the account, or convert it to a checking account. Transfers between your own accounts and ATM withdrawals typically count toward this limit, though some banks count them differently—confirm the rules before opening.
Is it better to open at an online bank or a traditional bank?
Online banks pay significantly higher rates (often 4% to 5% versus 0.5% to 1.5%), but traditional banks offer branch access and cash deposits. If you prioritize earning interest and can transfer money electronically, an online bank is usually the better choice. If you deposit cash regularly or value in-person service, a traditional bank or credit union may be worth the lower rate.
Do I need a minimum deposit to open a money market account?
Most institutions require an opening deposit of $0 to $2,500, though some require $10,000 or more. Check the specific bank's requirements before applying. Even if there is no opening deposit requirement, you may need to maintain a minimum balance to earn the stated rate or avoid monthly fees.