Technology reporter
Barclays bank has confirmed it is experiencing IT problems which it says is affecting its app, online banking and payments in and out of accounts.
The bank says it is also unable to provide help via telephone or its “Message us” service.
It says cards and cash machines can be used as normal – though some customers have said this is not their experience.
Barclays has not explained the cause of the outage, or how many people are affected.
It has apologised for the problems – which are occurring on what is pay day for many people in the UK – and says it is “working hard to fix the issue”.
Customers replying to Barclays’ announcement about the outage on social media are reporting a series of problems.
One said their card had been declined despite them having funds, while others have reported money going missing during transactions.
One customer said that that her January wages “had disappeared”.
Some have highlighted that Friday is the deadline for self-assessment tax returns, and say the outage has left them unable to make payments to HMRC.
Barclays is one of the UK’s largest banks, with over 20 million UK retail customers. It says it processes over 40% of the UK’s credit and debit card transactions.
BBC News has contacted Barclays and HMRC for comment.