This includes current accounts, mortgages, personal deposits, personal loans, home, car and life insurance and personal credit cards.
"We remain determined to support customers in every way possible, to meet our responsibilities and minimise to the greatest extent possible, the inconvenience caused to them. KBC Bank Ireland will continue to support existing customers with their day-to-day banking needs," the bank said in a statement.
"Customer service remains the highest priority and KBC customers will continue to receive the service they deserve," it added