ANZ first acknowledged the technical problem this morning, issuing a statement to its customers via Facebook and Twitter.
"We're aware that some customers are currently experiencing issues with our goMoney app," the Facebook statement read. "Our Tech team is looking into this & we'll update as soon as we know more. You can still bank using Internet Banking or www.anz.com/mobilelanding on your mobile. Very sorry for any inconvenience."
Users reported facing an error message telling them they had entered an incorrect PIN when attempting to access their accounts through the app, with some reporting that the app had been out since yesterday.
ANZ later updated users on the status of the outage, saying that the app was "starting to come back up" this afternoon.
"It may be a bit slow at the start...[we] appreciate your patience and sorry again for the inconvenience."
In a statement to CNET this afternoon, an ANZ spokesperson confirmed the outage and apologised to customers.
"ANZ had a technical issue today which meant customers were not able to access their accounts via our mobile banking app ANZ goMoney," said the spokesperson. "The issue started early this morning and we had a team of people working hard to get it back up and running as soon as possible, which we were able to do by around 12.30pm.
"Internet banking, eftpos, ATMs and branch systems were not impacted. We would like to apologise to our customers for any inconvenience this has caused."