In 2025, Americans reported losing $3.04 billion to business email compromise, the scam where a fraudster poses as a vendor, a boss, or a title company and tricks someone into sending money to the wrong account. According to the FBI’s Internet Crime Complaint Center, 86% of those losses moved by wire transfer or ACH, fast payment rails that are extremely difficult to claw back once the money is gone. Understanding how wire transfers work is the best defense against that, because almost everything that makes a wire dangerous is the same thing that makes it useful: it’s fast, it’s final, and once it settles, no one is obligated to send it back.
A wire transfer is a direct, bank-to-bank movement of money. You instruct your bank to take a specific amount from your account and deliver it to a named account at another bank. There’s no card network in the middle and no check to clear. The two banks talk to each other through a settlement system, the receiving bank credits the destination account, and the transfer is done, usually the same business day.
How wire transfers work underneath: Fedwire and CHIPS
Most large domestic wires in the United States travel over one of two networks. The first is Fedwire, the Fedwire Funds Service, which is owned and operated by the twelve Federal Reserve Banks. The second is CHIPS, the Clearing House Interbank Payments System, run by a consortium of large banks. They work differently in a way that’s worth understanding.
Fedwire is a real-time gross settlement system, which means it processes each payment individually and in full the moment it’s sent. When your bank originates a wire, it instructs a Federal Reserve Bank to debit its own account at the Fed and credit the receiving bank’s account at the Fed. Money moves through central-bank accounts, one transaction at a time, with finality built in at each step. CHIPS, by contrast, is a netting system. It batches up the day’s payments between banks and settles the net difference, which is efficient for the thousands of large transfers that flow between major institutions but settles on a slightly different rhythm. Fedwire connects thousands of financial institutions; CHIPS has a few dozen participants, mostly the biggest banks. For an ordinary consumer wire, the practical takeaway is that your money is being moved through the core machinery of the banking system, not a consumer app layered on top of it.
That machinery keeps banker’s hours. The Fedwire Funds Service operates from 9:00 p.m. Eastern the night before through 7:00 p.m. Eastern, Monday through Friday, excluding holidays, with a 6:45 p.m. cutoff for transfers sent on behalf of a customer. Miss your bank’s cutoff, which is usually earlier than the Fed’s, and your wire waits until the next business day. This is why wires don’t go out on weekends.
Why wire transfers can’t be reversed
Here’s the part that catches people off guard. A Fedwire transfer is irrevocable once the Federal Reserve credits the payment to the receiving bank or delivers the payment order to it, whichever comes first. There is no built-in undo button. If you wire money to the wrong account, your bank cannot simply pull it back. The only path to recovery is to ask the receiving bank to request that its customer voluntarily return the funds, and if that customer is a fraudster who has already withdrawn the money, the request goes nowhere.
This is the deepest difference between a wire and the other ways you move money. A credit card charge can be disputed under the Fair Credit Billing Act. An unauthorized debit card or ACH transaction is covered by the Electronic Fund Transfer Act and Regulation E, which can put your bank on the hook for fraudulent withdrawals you report promptly, a protection we cover in our explainer on Regulation E and debit card fraud rights. Wires occupy a different category. A domestic consumer wire that you authorized, even one you authorized because a scammer fooled you, generally isn’t covered by Reg E’s error-resolution process. You told the bank to send it, the bank sent it, and the rules treat that as a completed instruction rather than a mistake the bank made.
There is one important carve-out. International wires sent by consumers are protected by the CFPB’s remittance transfer rule, an amendment to Regulation E that applies to providers handling more than 500 remittance transfers a year. That rule requires upfront disclosure of fees, exchange rates, and delivery timing, and it gives you a short window, typically 30 minutes, to cancel before the money is delivered. But that window is measured in minutes, not the days you’d have with a card dispute, and it doesn’t apply to most domestic wires at all.
Wire transfer versus ACH: speed for finality
People often lump wires together with ACH, the Automated Clearing House network behind direct deposit, online bill pay, and app transfers like the ones from your bank to a brokerage. The trade-off between them is real. A wire transfer vs ACH comparison comes down to speed against cost and reversibility. Wires settle the same day and are final almost immediately, which is why they’re used for time-sensitive, high-value transactions like real estate closings. They also cost money: the median outgoing domestic wire fee is around $25, according to Bankrate, with international wires often running $40 to $50, though some online banks like Marcus and Fidelity charge nothing. ACH transfers are usually free or close to it and can be reversed in certain situations, but they take one to a few business days. You’re paying the wire fee, in part, for the finality.
What this means when you actually send one
Because a wire is final, the moment that deserves your full attention is before you hit send, when you confirm where the money is going. Verify the recipient’s bank account number and routing number directly, ideally by calling a phone number you already trust rather than one in an email, since fraudsters specialize in sending convincing last-minute “updated wiring instructions.” If you’re unsure how those numbers identify an account in the first place, our guide on routing numbers versus account numbers walks through the system. For large or high-stakes payments where you don’t need instant settlement, a slower instrument with more recourse, like a cashier’s check, may serve you better, a comparison we lay out in cashier’s check vs money order vs certified check.
Knowing how wire transfers work doesn’t make them risky; it makes them predictable. The speed and finality that fraudsters exploit are the same features that let a home sale close in an afternoon. The system is doing exactly what it was built to do. Your job is simply to be as certain of the destination as the network is of the delivery.