Nationwide, First Direct, Lloyds and Halifax have lloyds have been hit by major outages.
It is the second month in a row that major banks have been hit by IT issues around payday, with experts saying online banking systems often struggle with the high rate of activity as wages and bills go in and out of accounts at the end of each month.
In messages posted online, the banks said they are working to return their systems to normal.
Nationwide said in a message on its website "some incoming and outgoing payments are delayed at the moment", but that "everything else is working normally".
It said direct debits and standing orders are working as normal, but payments are in a queue and will arrive soon, adding customers do not need to do anything.
Lloyds, Nationwide, Halifax, and First Direct banking apps go down on payday
- Second payday in a row to be affected by outages
Some customers report banking coming back online
11:16 , Andrew GriffinUsers are reporting their banking systems are back online. If it’s not working, it’s worth force quitting and trying re-open the app. Though it might still not work!
Don't make payments twice
10:28 , Andrew GriffinThere’s always one big bit of advice from banks at times like this: don’t make payments twice. It might sometimes look like they haven’t gone through, but they might actually have done so, which means that re-trying could end up sending double the money.
Second payday in a row to be affected by outages
10:21 , PAAt the end of last month and in early February, Barclays, Lloyds Bank and Halifax were all hit by service outages which left customers unable to access funds on or just after payday.
Fintech expert Chris Skinner told the PA news agency in the wake of those outages that banks were finding it "too hard to keep up" with fast-moving technology.
"I think the world is spinning so fast with technology that the challenge we have is no-one's keeping up, particularly regulators and lawmakers," he said.
"So the regulators and lawmakers need to have people who do better due diligence.
"I think there's an issue here with reliability, service and resilience, and that's the accountability of the people who are organising the structures, both from within the business, and those who look over the business in terms of the regulators.
"At the moment, I think both are probably finding it too hard to keep up."
He added the vast array of modern tech systems needed to operate in the banking world today mean firms have "such a smorgasbord of things they have to work with", the "competence of keeping up with these changes is really challenging every bank".
Mr Skinner, who also runs industry blog The Finanser, said the flurry of outages on Fridays - and sometimes close to paydays - is likely due to banks planning software updates for weekends as it tends to be a quieter time to carry out such work.
Hello and welcome...
10:17 , Andrew Griffin... to our live coverage of banking issues across the UK, which have left people without access to their online services on payday.
