What a bank sweep does
A bank sweep is an automatic transfer that moves money between two accounts you own at the same bank. When your checking account balance drops below a set amount, the sweep pulls money from a linked savings account (or money market account) to cover it. When your checking balance rises above a different threshold, the sweep pushes the extra money back into savings. The bank does this without you having to log in and transfer manually each time.
Sweeps work in real time or at the end of each business day, depending on your bank's setup. The goal is to keep enough money in checking to cover bills and everyday spending while parking the rest somewhere it earns interest—usually a savings account that pays more than checking does.
Key Takeaways
- A sweep automatically moves money from savings to checking when your checking balance falls below a threshold you set, and moves it back when checking rises above another threshold.
- Sweeps help you avoid overdraft fees by ensuring checking always has enough to cover transactions, while keeping extra money in an interest-bearing account.
- You set the thresholds yourself—for example, "move money in if checking drops below $500, move it back out if checking rises above $2,000"—and can change them anytime.
- Sweeps are free at most banks, but some charge a small fee per transfer or only offer them on premium accounts.
- A sweep is different from overdraft protection, which uses a credit line or linked account to cover a shortfall but may charge a fee each time it triggers.
How the sweep thresholds work
You choose two numbers when you set up a sweep: a minimum threshold and a maximum threshold. If your checking balance falls to or below the minimum, the bank automatically transfers money from savings into checking. If your checking balance rises to or above the maximum, the bank transfers the excess back to savings.
For example, you might set the minimum at $500 and the maximum at $2,000. If you spend down to $450, the sweep moves money from savings into checking to bring it back up—usually to the minimum amount or to a round number like $1,000. If a paycheck deposits and your checking hits $2,100, the sweep moves the $100 (or more, depending on the bank's rules) back to savings.
You can change these thresholds anytime through your bank's website or app, or by calling customer service. Some banks let you pause the sweep temporarily if you know you are about to make a large purchase and do not want the extra transfer.
Why sweeps save money on overdraft fees
An overdraft happens when you spend more than you have in checking. Most banks charge $25 to $35 per overdraft, and you can rack up multiple fees in a single day if several transactions post. A sweep prevents this by automatically topping up checking before the balance goes negative.
Because the sweep moves money from your own savings account—not a credit line or external source—there is no interest charge and no credit impact. You are simply moving your own money around. The bank does not report the transfer to credit bureaus, and it does not affect your credit score.
The trade-off is that money sitting in checking typically earns little or no interest, while money in savings earns more. A sweep balances this by keeping only what you need in checking and the rest in savings, so more of your money is in the higher-rate account.
Sweep costs and which banks offer them
Most major banks—including Chase, Bank of America, Wells Fargo, and Citibank—offer sweeps for free on standard checking accounts. Some banks call them "balance transfers" or "automatic transfers" instead of sweeps, but the function is the same.
A few banks charge per transfer, usually $1 to $3 each time the sweep triggers. Others offer sweeps only on premium or business accounts. Before you open an account, check the bank's fee schedule or ask a representative whether sweeps are free and whether there are limits on how many times per day or month the sweep can run.
Online banks and credit unions often offer sweeps at no cost as well. If you are comparing banks, the cost of sweeps (or lack thereof) is worth factoring in, especially if you expect the sweep to trigger multiple times per month.
Sweep versus overdraft protection
Overdraft protection is a different tool that also prevents overdrafts, but it works differently. With overdraft protection, the bank covers a shortfall using a linked savings account, a credit line, or a line of credit. Each time the bank covers an overdraft, it charges a fee—usually $10 to $35—even though it is your own money being used.
A sweep is proactive: it moves money before you overdraft. Overdraft protection is reactive: it covers the overdraft after it happens and charges you for the service. If you overdraft three times in a month with overdraft protection, you pay three fees. With a sweep, you pay nothing because the overdraft never occurs.
Some people use both: a sweep as the first line of defense, and overdraft protection as a backup in case the sweep does not trigger in time (for example, if a large transaction posts before the sweep runs). Check your account settings to see which protections you have turned on.
Setting up a sweep and managing it
To set up a sweep, log into your bank's website or mobile app and look for "transfers," "automatic transfers," or "sweep" in the account settings or tools menu. You will enter the two accounts (checking and savings), set your minimum and maximum thresholds, and confirm. The sweep usually starts the next business day.
Once it is running, you do not have to do anything. The bank handles the transfers automatically. If you need to change the thresholds—for example, because you got a raise and want to keep more money in savings—you can update them anytime. If you are going through a tight month and want to pause the sweep so more money stays in checking, most banks let you turn it off temporarily through the same menu.
Check your account statements regularly to see when the sweep is triggering. If it is moving money very frequently (multiple times per week), your thresholds may be too close together, and you might want to widen the gap. If it never triggers, your thresholds may be too far apart, or you may not have enough money in savings to make the sweep worthwhile.
When a sweep might not be the right choice
A sweep works best if you have money in savings to sweep from. If your savings account is empty or nearly empty, the sweep cannot help you, and you will still overdraft. In that case, overdraft protection linked to a credit line might be a better backup, though it will cost you in fees.
A sweep also assumes your checking and savings are at the same bank. If you bank at multiple institutions, you cannot set up a sweep between them. You would need to do manual transfers or use a bill-pay service to move money between banks.
If you are paid irregularly or your spending is very unpredictable, a sweep with tight thresholds can trigger many times per month. Some banks limit the number of transfers per month (especially for savings accounts, which have federal limits on certain types of transfers). Check your account agreement to see whether there are caps on sweep frequency.
Frequently Asked Questions
Does a sweep count against the six-transfer limit on savings accounts?
Federal rules used to limit savings account transfers to six per month, but those rules were suspended in 2020. Most banks have not reinstated the limit, though some still track transfers informally. Check your account agreement or call your bank to confirm whether sweeps count toward any transfer limits on your savings account.
What happens if my savings account does not have enough money to cover the sweep?
If the sweep tries to move money but your savings balance is too low, the transfer simply does not happen. Your checking account will not be topped up, and you may overdraft. The bank will not pull from another account or create a loan to cover the gap. Make sure your savings account has a buffer above what you need for the sweep to work.
Can I set up a sweep between checking and a money market account?
Yes, most banks allow sweeps between checking and money market accounts. Money market accounts often pay higher interest than savings, so this can be a good option if your bank offers it. Confirm with your bank that the money market account is may be able to access for sweep transfers before you set it up.
Will the sweep affect my credit score?
No. A sweep is a transfer between your own accounts and does not involve borrowing or credit. The bank does not report it to credit bureaus, and it has no impact on your credit score or credit history.
What if I need the money in savings and the sweep just moved it to checking?
You can turn off the sweep anytime or adjust the thresholds to keep more money in savings. If you know you need access to your savings for an upcoming expense, pause the sweep or set the maximum threshold lower so less money gets moved to checking. You can always turn it back on later.