The NatWest banking app is down leaving customers unable to send any payments.
More than 1,000 reports have been made on outage tracker DownDetector shortly after 7am today.
Customers are complaining online they keep getting signed out of the app when they try to process a payment.
It comes as millions would have been paid their wages today on the last working day of the month.
The Royal Bank of Scotland, which is owned by NatWest Group, also appears to be experiencing technical issues which 200 reported outages.
One person wrote: ‘I can’t make a payment to someone via my banking app. Let’s me get the whole way through, and then when I go to send the payment it says there’s been an error and my session has timed out.’
Another added: ‘Does the app have bug? I’m trying to pay my bills and it continues to log me out! I’ve tried 20 times this morning!’
One renter wrote: ‘Trying to send money to pay my rent and it keeps kicking me off.’
NatWest said: ‘We’re aware that there is an issue arranging transfers through the app. We’ve raised this internally and is currently being investigated by our tech team.
‘I’m afraid we don’t have an exact timeframe on this, but our team are working hard to resolve this.’
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