Unrecognised transactions

Ever noticed a transaction on your account that seemed out of place? It could be fraudulent, but many unrecognised transactions can be cleared up with a little investigation. Here’s how you can check:

  1. Ask any secondary cardholders if they’ve made a transaction you aren’t aware of.
  2. See if the merchant is legitimate by using the government’s ABN Lookup.
  3. Google the billing name on your statement because lots of businesses trade under a different name. If you know the merchant, the easiest way to dispute a transaction may be to get in touch with them directly. If you know the merchant but can’t contact them, you can submit a transaction dispute with our Dispute Team.

If you still can’t identify the transaction, it may be fraud. Our Fraud Team monitors your cards 24/7 for suspicious activity – and they’ll send you an SMS if they notice anything unusual. Sometimes a transaction that looks legitimate may have been made without your consent. If you think this is the case, call us.

NAB Fraud contact details

telephone banking
Contact details Contact hours
Personal banking within Australia Contact details

13 22 65

Quote 'Fraud Assist'

Contact hours Mon-Fri, 8am-7pm (AEST/AEDT)

Sat, 7am-6pm (AEST/AEDT)

Sun, 9am-6pm (AEST/AEDT)

Business banking within Australia Contact details 13 10 12 Contact hours Mon-Fri, 8am-7pm (AEST/AEDT)

Sat-Sun, 9am-6pm (AEST/AEDT)

Personal and business banking if you're overseas Contact details +61 3 8641 9083 Contact hours Mon-Fri, 8am-7pm (AEST/AEDT)

Sat-Sun, 9am-6pm (AEST/AEDT)

Premium Card holders within Australia Contact details 1300 730 213 Contact hours 24 hours, 7 days
Premium Card holders if you're overseas Contact details +61 3 9322 6625 Contact hours 24 hours, 7 days
Signature Card holders within Australia Contact details 1300 489 410 Contact hours 24 hours, 7 days
Signature Card holders if you're overseas Contact details +61 3 9322 6624 Contact hours 24 hours, 7 days

Lost or stolen cards

If your card has been misplaced, lost or stolen, you have a range of options.

Credit Card Assistance

Type of fraud and scams

Protect yourself with NAB

Online security help guides

Protect yourself and your loved ones with these tips and resources to help keep your internet devices secure.

Cyber safety tips for your business

Protect your small to medium sized business with these tips and resources for you, and your employees, to help keep your business and your customers secure online.

If you’ve responded to a suspicious email or text message and provided banking details,
please call NAB on 13 22 65 immediately or visit your local branch.

Help and advice

You can learn more about identifying fraud and scams at:


Run by the Australian Competition and Consumer Commission (ACCC). It provides information to consumers and small businesses about how to recognise, avoid and report scams.

Find out more

Australian Cyber Security Centre and Stay Smart Online

It’s the hub for private and public sector collaboration and information sharing to combat cyber security threats. ACSC’s Stay Smart Online provides topical, relevant and timely information on how home internet users and small businesses can protect themselves from, and reduce the risk of, cyber security threats such as software vulnerabilities, online scams, malicious activities, and risky online behaviours.

Find out more


If you’ve been a victim of identity theft, IDCare can help. This dedicated, not-for-profit organisation provides specialised support and guidance for protecting your identity from further theft or misuse. The service is free of charge, and tailored to your individual situation.

Phone: 1800 595 160

Find out more


It’s a secure reporting and referral service for cybercrime and online incidents which may be in breach of Australian law. The ReportCyber website provides a cybercrime reporting mechanism as well as helpful information about cybercrime.

Find out more