Field guide · No. 10 · Email

Invoice and bank-detail-change fraud

The tell: A supplier, landlord or colleague emails that their bank details have changed.

Hi, please note our bank details have changed with immediate effect. Kindly update your records and send the next payment of £14,250 to the new account below. The old account is now closed. Let me know once it has been done.

Check this example

How it works

  1. A criminal gets into someone’s email account, or sets up a near-identical address, and watches real invoice conversations.
  2. At the right moment they send an email that looks like part of the thread: “our bank details have changed”.
  3. The finance team updates the payee. The next payment goes to the criminal’s account, and it moves on within hours.
  4. The real supplier chases an unpaid invoice, and that’s when it’s discovered.

This is sometimes called business-email compromise. It hits households too: conveyancing and building work are common targets.

The tells

  • A change of bank details, especially “with immediate effect” or “the old account is closed”.
  • A sender address that differs by a letter or a hyphen, or a reply-to address that isn’t the sender’s.
  • Pressure to pay this invoice quickly.
  • Reluctance to talk by phone.

What to do

  • Phone the supplier on a number you already had on file, not one from the email, and confirm the change before paying.
  • Require a second person to approve any change to payee details.
  • If you’ve already paid to the wrong account: call your bank immediately and ask them to recall the payment, and tell the real supplier.
  • Check the email headers or ask your IT team whether the genuine account was compromised.

Where to report it

Anywhere in the world
  • Your bank or card provider. First, if money or card details are involved. Use the number on your card.
  • The platform where it happened. Use its “Report” button: the marketplace, the messaging app, the social network.
  • Your local police. If you’ve lost money, and for a reference number your bank may ask for.
  • Your national fraud or consumer-protection agency. Search for it by country; use a government address (.gov or the equivalent).
United States

Links last checked 2026-10-12.

United Kingdom
  • Forward suspicious emails to report@phishing.gov.uk — Handled by the National Cyber Security Centre.
  • Forward suspicious texts to 7726 — Free. Your mobile provider receives the report.
  • Report Fraud (England and Wales) — If you’ve lost money or been hacked. Phone 0300 123 2040.

Links last checked 2026-10-12.

Canada

Links last checked 2026-10-12.

Australia
  • Scamwatch — Run by the national consumer regulator.

Links last checked 2026-10-12.