Nationwide building society’s online banking, mobile banking and online payments systems are unavailable as a result of IT issues.
The building society, which is going through a £1bn IT transformation said the IT issues affected the online services, but added that customers could still get cash from ATMs.
“We are currently experiencing an IT issue affecting our online bank," said a Nationwide statement.
"Customers can still use ATMs to withdraw cash and check their balance and our branches are open to deal with our customers’ needs. We apologise for the inconvenience this has caused and we are working to resolve the issue as quickly as possible.”
In November, as part of its transformation Nationwide launched of its mobile banking service, which is built on the new internet bank which was introduced in October 2011. The online bank was developed in partnership with IBM, the new platform integrates with over 30 line-of-business applications and has taken almost three years to develop.