NAB customers are unable to access their online banking and app, with the bank confirming the services are not working.
The bank, which has 10 million customers, said this afternoon it was trying to fix the issue.
Customers who logged onto the app or online banking today received a message saying the service was not available.
“We’re aware of an issue currently impacting some of our services including internet banking, mobile and desktop,” the spokesperson said.
“Our tech team is investigating and working to fix this as soon as possible.
“We are continuing to keep our customers updated via banners in our digital banking channels and across social media.”