Nationwide, HSBC, Barclays and Virgin Money customers have been affected by problems affecting their banking services.
The issues could affect workers on what is commonly pay day for many across the country.
Nationwide said there is a “delay with some customers receiving their salary or pension payments today” and Barclays reports issues with transfers and payments that “may not arrive as normal”.
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Meanwhile, HSBC and Virgin Money said it is aware of issues affecting its online and mobile banking – with the former “really sorry” and the latter saying it is working to resolve the issue “as quickly as possible”.
“We’re really sorry that some customers are having issues accessing personal online and mobile banking,” HSBC UK said on its website.
“Our IT teams are working hard to get these services back to normal. You can still authorise online card purchases via SMS.”
According to website DownDetector, more than 7,000 problems were reported at about 8.45am on Friday morning.
The site also shows a spike in reports of outages for high street bank Virgin Money and building society Nationwide.
Nationwide customers complained on social media platform X they had not received their wages into their accounts.
The bank said it is “aware there is a delay with some customers receiving their salary or pension payments today”.
“These payments are being processed, and will be paid into your account today,” it added. “Sorry for any inconvenience this is causing.”
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Virgin Money said on X it is “aware of intermittent issues with accessing online banking and our app, which we’re working to resolve as quickly as possible”.
The bank had earlier alerted customers to delays to payments in and out of accounts and asked users not to try to make payments again if they had received an error message.
Barclays, responding to a user on X who said he’s not been paid, said they are “aware of this issue” and are doing “everything… to get this resolved as quickly as possible”.
Last month, NatWest experienced a four-hour outage affecting its mobile and online banking services.