NAB customers have been unable to access their accounts with the bank suffering an outage to its online, mobile, EFTPOS and ATM services.
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Furious customers have taken to social media on Saturday to complain about being unable to pay for items such as fuel or food due to the outage.
It's believed the outage began at approximately 8am AEST.
"The company I work for has literally lost thousands of dollars in sales this morning because of this. And we have no ETA as to when it'll be fixed," user @josh_salmon tweeted.
Others complained about being unable to pay for things such as taxi fares overseas due to the outage.
NAB apologised to customers and said they were working on a fix "ASAP".
"We're currently experiencing issues with multiple services, including Internet and Mobile Banking and ATMs and EFTPOs," the bank tweeted.
"Our teams are working to fix this as soon as possible. We're sorry for the inconvenience."
Customers of NAB-owned BNZ in New Zealand are facing similar problems.
Australian Associated Press