The core terms you need to know

A checking account is a deposit account that lets you withdraw money on demand, usually through a debit card, check, or electronic transfer. The bank holds your money and pays you interest on it (usually none, or very little). You can make unlimited withdrawals.

A savings account is also a deposit account, but the bank expects you to keep money in it longer. You earn interest on the balance. Most banks limit how many withdrawals you can make per month—often six—though this rule is enforced less strictly now than it was before 2020.

A debit card is a plastic card linked to your checking account that lets you spend money directly from that account. When you swipe it, the money leaves your account when ready. It is not a loan.

A check is a written order to your bank to pay a specific amount to a specific person or business. You write it, sign it, and give it to the payee. The bank deducts the amount from your account when the check clears—which can take several days.

Key Takeaways

  • A checking account lets you withdraw money on demand with no monthly limit, while a savings account restricts withdrawals and pays interest.
  • A debit card pulls money directly from your checking account at the moment you use it, with no delay or credit involved.
  • A check is a written instruction to your bank to pay someone, and the money does not leave your account until the check is deposited and clears.
  • An overdraft happens when you spend more than your account balance, and the bank either declines the transaction or covers it and charges you a fee.
  • A routing number identifies your specific bank branch, while an account number identifies your specific account within that bank.

Account numbers, routing numbers, and what they do

Your account number is a unique identifier for your specific checking account. It is usually 8 to 12 digits. You need it to set up direct deposit, automatic bill payments, or wire transfers. Anyone with your account number and routing number can send money to your account, but they cannot withdraw from it without your permission.

Your routing number is a nine-digit code that identifies the specific bank branch where your account is held. Every bank has multiple routing numbers—one for each region or processing center. You need both the routing number and account number together to receive money via ACH transfer (the system most employers use for direct deposit) or wire transfer.

You can find both numbers on the bottom left of any check you write. The routing number comes first, then the account number. Your bank's website also displays both in the account details section.

Overdrafts and what happens when you spend more than you have

An overdraft occurs when you attempt to spend more money than is in your checking account. What happens next depends on your bank's policy and whether you have overdraft protection.

If you do not have overdraft protection, the bank will decline the transaction—your debit card will be rejected, your check will bounce, or your bill payment will fail. You will not be charged a fee for the declined transaction itself, though the merchant may charge you a fee for a returned check.

If you have overdraft protection, the bank will cover the shortfall and charge you an overdraft fee, typically $25 to $35 per transaction. Some banks charge multiple fees if several transactions overdraw your account on the same day. You can usually opt out of overdraft protection, which means transactions will straightforward be declined instead.

Direct deposit and how money enters your account

Direct deposit is an electronic transfer of money from your employer (or another source, like a government agency) directly into your checking account. Your employer sends the money through the ACH network using your routing number and account number. The money typically arrives one to two business days after your employer initiates the transfer, though some employers offer next-day or same-day options.

To set up direct deposit, you give your employer a form with your routing number, account number, and the name and address of your bank. You do not need to do anything else—the money will arrive automatically on payday. Direct deposit is free and more find than receiving a paper check, since there is no physical document to lose or deposit manually.

ACH transfers, wire transfers, and the difference in speed

An ACH transfer (Automated Clearing House) is an electronic transfer of money between bank accounts. It runs through a batch processing system, so transfers typically take one to three business days to complete. ACH transfers are free or very cheap, usually under $1. They are used for direct deposit, bill payments, and person-to-person transfers through apps like Venmo or PayPal.

A wire transfer is a faster, direct electronic transfer between banks. The money moves the same day or next business day, depending on the time you initiate it and your bank's processing schedule. Wire transfers cost $15 to $50, depending on whether the transfer is domestic (within the US) or international. Wire transfers are final once sent—you cannot cancel them if the recipient's information is wrong, so verify the account number and routing number before you send.

Use ACH transfers for routine payments and transfers where timing is not urgent. Use wire transfers when you need money to arrive quickly or when the recipient does not accept ACH (for example, some real estate transactions require wire transfers).

Minimum balance, monthly fees, and what banks charge for

A minimum balance is the lowest amount of money your bank requires you to keep in your checking account to avoid a monthly fee. Some banks require $500, others $1,000 or more. Some banks have no minimum at all. If your balance drops below the minimum on any day of the month, you will be charged a fee—typically $10 to $15—even if you bring the balance back up later that same day.

A monthly maintenance fee is a charge your bank deducts from your account each month for keeping the account open. It ranges from $5 to $15 depending on the bank and account type. Many banks waive this fee if you maintain the minimum balance, set up direct deposit, or use the debit card a certain number of times per month. Online banks typically charge no monthly fee at all.

Some banks also charge fees for specific actions: using an out-of-network ATM (usually $2 to $3), overdrafting, requesting a cashier's check, or closing the account within a certain timeframe. Read your bank's fee schedule before opening an account if fees are a concern.

Interest rates and why most checking accounts pay almost nothing

Interest is money the bank pays you for letting them hold your money. The interest rate is expressed as an annual percentage yield (APY). Most traditional checking accounts pay 0.01% APY or less—meaning if you keep $1,000 in the account for a year, you earn about 10 cents.

Savings accounts and money market accounts pay higher interest rates because banks expect you to leave the money untouched for longer periods. High-yield savings accounts at online banks currently pay 4% to 5% APY, though this changes as the Federal Reserve adjusts interest rates. Checking accounts almost never pay this much because the bank needs quick access to the money you deposit.

If you have a large balance sitting in a checking account, moving it to a savings account or money market account will earn you more interest. The tradeoff is that you cannot access the money as quickly or as often.

Frequently Asked Questions

What is the difference between a checking account and a savings account?

A checking account is for frequent spending and withdrawals with no monthly limit. A savings account is for storing money longer and earns interest, but most banks limit withdrawals to six per month. Checking accounts pay little or no interest; savings accounts pay more.

How long does it take for a check to clear?

A check typically clears within two to five business days after the recipient deposits it. The exact timing depends on the banks involved and whether the check is deposited in person or through mobile deposit. The money does not leave your account until the check is actually deposited and processed, not when you write it.

Can I use my checking account routing number to receive money from anyone?

Yes. Anyone with your routing number and account number can send you money via ACH transfer or direct deposit. They cannot withdraw money without your permission. However, do not share this information with people you do not trust, since they could attempt unauthorized transfers.

What happens if I write a check for more money than I have in my account?

The check will bounce if you do not have overdraft protection. The recipient will not receive the funds, and your bank will charge you a returned check fee. If you have overdraft protection, the bank will cover it and charge an overdraft fee instead. You can opt out of overdraft protection to prevent this.

Why do wire transfers cost money but ACH transfers usually do not?

Wire transfers move money the same day through a direct, when ready system that requires manual processing by bank staff. ACH transfers batch process overnight and are automated, so they cost almost nothing to send. You pay for the speed and certainty of wire transfers.