What is wire fraud? Definition, examples, and how to stop it

Wire fraud is a federal crime under 18 U.S.C. § 1343 covering any scheme to obtain money or property through false pretenses using interstate or foreign electronic communications. For finance teams, it often looks like an email from a known supplier with new bank details, leading an accounts payable (AP) clerk to wire payment to a fraudster.

That’s the version most likely to hit your business. Awareness alone won’t stop it, but payment controls will.

What is wire fraud?

Wire fraud means a scheme to defraud, carried out with intent to defraud, using a wire communication in interstate or foreign commerce, as defined in 18 U.S.C. § 1343. The scheme doesn't have to succeed. Sending the fraudulent request is enough to complete the crime.

The wire covers far more than bank wires. Email, phone calls, internet messages, and electronic transfers all count, and even a payment between two companies in the same state can qualify once the email or transfer routes through servers elsewhere.

Payment requests, invoices, and bank-detail updates travel over exactly these channels. That makes accounts payable the place your business is most likely to meet wire fraud.

The wire fraud statute: 18 U.S.C. § 1343

The wire fraud statute makes it a federal crime to use any interstate or foreign wire, radio, or television communication to carry out a scheme to defraud or to obtain money or property by false pretenses. To convict, prosecutors must prove three elements:

1. A scheme to defraud: A plan to obtain money or property through materially false pretenses, representations, or promises. The lie has to be material, meaning it could influence a reasonable person's decision.
2. Intent to defraud: The person knowingly set out to deceive and take money or property. An honest billing mistake fails this test.
3. Use of a wire communication: An interstate or foreign wire transmission was used to carry out the scheme, even if that single email or call was a small part of it.

Three related charges often show up alongside wire fraud:

• Mail fraud (18 U.S.C. § 1341): The same scheme carried out through the U.S. Postal Service or a private carrier like FedEx or UPS.
• Conspiracy to commit wire fraud (18 U.S.C. § 1349): An agreement between two or more people to commit wire fraud, which carries the same penalties as the underlying offense.
• Honest services fraud (18 U.S.C. § 1346): A scheme to deprive an employer or the public of someone's honest services, usually through bribes or kickbacks.

If an insider and an outsider coordinate a fake vendor scheme, prosecutors can charge both the fraud itself and the conspiracy behind it.

Wire fraud penalties

Wire fraud carries up to 20 years in federal prison per count, under 18 U.S.C. § 1343. That ceiling rises to 30 years and a fine of up to $1 million when the fraud affects a financial institution or is tied to a federally declared disaster or emergency.

Ordinary felony fines run up to $250,000 for an individual or $500,000 for an organization, or twice the gross gain or loss, whichever is greater. Courts can also order restitution and forfeiture.

The statute of limitations is generally 5 years, or 10 years when the fraud affects a financial institution. Each fraudulent wire can count as a separate charge, so a scheme that ran across a dozen invoices can stack into a dozen counts.

Wire fraud vs. mail fraud vs. bank fraud

Mail fraud and wire fraud differ by channel, while bank fraud differs by target. Wire fraud uses electronic communications under § 1343, mail fraud uses the US Postal Service (USPS) or private carriers under § 1341, and bank fraud targets a financial institution directly under § 1344.

One payment scam can bring more than one charge. A fake invoice mailed to you, followed by an email with updated wiring instructions, touches both mail and wire fraud statutes. The channel also shapes where you report: Internet-based schemes go to the FBI's Internet Crime Complaint Center (IC3), while mail-based ones also go to the US Postal Inspection Service.

Keep the original email, envelope, or call log for every suspicious request, since the channel determines who investigates.

Types of wire fraud that target businesses

Most wire fraud that reaches a finance team arrives as a payment request that looks routine. Business email compromise alone drove $2.77 billion in reported losses in 2024, according to the FBI's IC3.

Business email compromise (BEC)

Business email compromise happens when a fraudster spoofs or takes over an executive's or vendor's email account and uses it to request an urgent wire. The timing is rarely random. Attackers often strike while the real person is traveling or hard to reach.

Spoofing and compromise aren't the same attack. A spoofed address is a look-alike, such as billling@ instead of billing@, which can be difficult to catch. A compromised mailbox is the real account under the attacker's control, so the sender address checks out and the message often replies inside an existing thread.

Scenario: A CEO email asks AP to wire a deposit today to hold an event venue.

Fake and spoofed supplier invoices

Fake invoices copy a real vendor's format, or come from vendors that don't exist, and count on getting paid without a match to a purchase order (PO) or receipt. Duplicate invoices work the same way: the same bill resubmitted with a slightly changed invoice number or amount.

Scenario: An invoice arrives from a known supplier with the right logo, but the total is a little off and the invoice number doesn't follow the vendor's usual pattern.

Vendor bank-detail change requests

Bank-detail change requests are the highest-loss vector for AP. A vendor emails new remittance instructions just before a large payment comes due.

The scheme works because almost everything about it is legitimate. The vendor is real and the invoice is real. Only the destination account changes.

Scenario: A steel supplier sends updated wiring instructions two days before a $180,000 payment for a large shipment.

Other wire fraud schemes

Investment scams, online auction fraud, and romance and consumer scams also qualify as wire fraud, but they mostly target individuals rather than AP teams. The Federal Trade Commission (FTC) tracks how these play out in its guidance on wire transfer scams.

Each of these schemes depends on one person acting fast and alone, which is exactly what a well-built approval workflow prevents.

Is it wire fraud? Common business scenarios

A disputed or failed transaction isn't wire fraud on its own. Intent and material deception make it a crime.

• An employee wired funds to a spoofed vendor: Yes, the fraudster committed wire fraud, and your company is the victim.
• A vendor overbilled you by email: Usually no. A billing dispute becomes wire fraud only if the vendor intentionally used material deception to get paid.
• Someone deposited a fake check, then asked you to wire back the overpayment: Yes, this is a classic wire fraud scheme, and the check bounces after your wire has already cleared.
• An invoice came from a compromised vendor mailbox: Yes, the fraudster committed wire fraud, and the vendor is a victim alongside you.
• A payment failed because you entered the wrong account number: No. An honest mistake has no intent to defraud.

When you can't tell, treat the request as suspicious and verify it before any money moves.

Red flags of wire fraud in accounts payable

Wire fraud in AP almost always shows at least one of these signs before the money leaves:

• Urgency or secrecy: "Wire today" or "keep this between us" is meant to stop you from checking with anyone.
• Last-minute changes to bank details or payment method: Redirecting funds just before a due date is the core move in vendor impersonation.
• A sender domain that's off by one character: Look-alike domains and mismatched reply-to addresses signal a spoofed email.
• Requests that bypass the normal approval chain: Fraudsters target whoever can release a payment without a second signer.
• An invoice with no matching PO or receipt: A bill for goods you never ordered or received points to a fake vendor.
• A new vendor's first payment going out as a high-value wire: Wires are fast and hard to reverse, which is why fraudsters ask for them.
• Payment to a personal account or an unfamiliar foreign bank: A destination that doesn't fit the vendor's history deserves a call before release.
• A near-duplicate invoice number or amount: Small tweaks to a paid bill are designed to slip past a quick visual check.

One red flag is enough reason to pause a payment and verify it.

How to stop wire fraud with AP controls

Training helps, but controls are what reliably stop wiring fraud. A payment shouldn't be able to leave unless the checks are built into the workflow and nobody can skip them.

1. Verify every vendor bank-detail change out of band

Confirm any change to vendor banking details by calling a number already on file, never one listed in the request email. Hold payments to the new account until someone has verified it. With Ramp Bill Pay, AP Agent checks every bill against 60+ fraud signals before payment, so a suspicious change gets flagged instead of paid.

2. Require dual authorization for payments

Require two approvers for every wire, and set stricter thresholds for new vendors, new bank details, and amounts above a set limit, such as $10,000. Bill Pay routes each bill through custom approval rules, so a high-risk payment can't go out on one person's sign-off.

3. Segregate duties across vendor setup, approval, and payment

The person who adds or edits a vendor shouldn't be the person who approves or releases its payment. Segregation of duties means a single compromised employee or inbox can't push a fraudulent payment end to end. In Bill Pay, approval routing sits apart from payment release, and every AI decision is auditable.

4. Match invoices and catch duplicates before payment

Match each invoice to its PO and receipt, and flag duplicates by vendor, amount, date, and invoice number. AP Agent detects duplicate bills automatically, so a resubmitted invoice gets caught before payment.

5. Know what to do in the first 24 hours after a fraudulent wire

Speed decides whether you get money back. Recovery isn't guaranteed, and the odds drop sharply after the first day.

• Call your bank: Ask it to recall the wire and contact the receiving bank.
• File with IC3: Report the fraud to the FBI's Internet Crime Complaint Center at ic3.gov.
• Preserve evidence: Save the emails with full headers, plus invoices and call logs.
• Notify the affected vendor: Their mailbox may be compromised, and other customers may be at risk.
• Review the control gap: Find the step that failed and fix it before the next payment run.

Write this response plan down now, so nobody is improvising while the clock runs.

Enforce payment controls automatically with Ramp Bill Pay

Manual controls break when AP is rushed, and fraudsters create that rush on purpose. A callback that gets skipped once or a second approver who signs without looking is all a spoofed invoice needs.

Ramp Bill Pay builds your payment controls into the AP workflow, so they run whether or not anyone remembers them. AP Agent reviews every bill before it's paid, flags fraud across 60+ signals, and routes approvals based on your own rules.

Wire fraud controls look like this with Ramp Bill Pay:

• Route every payment for approval: Custom multi-step approval rules give you dual authorization on wires and high-value bills.
• Flag fraud before money moves: AP Agent checks each bill against 60+ fraud signals, including suspicious changes, before you release payment.
• Catch duplicate bills automatically: AP Agent detects resubmitted invoices so you don't pay the same bill twice.
• Audit every decision: Every AI decision is auditable, so you can see why a bill was approved or flagged.
• Choose traceable payment methods: Pay by ACH, check, virtual card, or wire, and move high-risk vendors to the method that fits.

Try an interactive demo to see how Ramp Bill Pay stops fraudulent payments before they go out, and why companies that use Ramp save an average of 7.5% a year across all spending.