Ulster Bank says it cannot quantify the proportion of its customers' salary and mortgage payments that have been processed.
Today is the tenth day of IT problems at Ireland's third biggest retail bank.
Today the bank says that "the bulk" of salary payments are up-to-date, but that some customers might still experience a delay in receiving their pay.
A resolution to the problems is now expected by the middle of next week.
This follows criticism from the Central Bank last night which said in a statement that continuing delays in resolving the failures of Ulster Bank's payment system are "unacceptable".
The bank says 60 of its branches will stay open this Saturday, 22 on Sunday, and 80 branches have extended opening hours.
