Ulster Bank has this afternoon confirmed that all delayed credits have now been processed to customers' accounts here.

"Today's delay for our customers has been resolved and all transactions are now visible on our customer's accounts," an Ulster Bank spokesperson said. 

"We apologise unreservedly for the impact this issue has had and no customer will be left out of pocket as a result of this," the spokesperson added. 

Ulster Bank said the issue did not impact all of its customers as the majority of payments were completed overnight. 

Earlier Ulster Bank had admitted that it was experiencing delays in applying credits to some customers' accounts, and said it was working to fix the problem urgently.  

An Ulster Bank spokesperson said it was aware that some customers have experienced a payment delay earlier this morning. 

"No customer will be left out of pocket and emergency cash is available for Ulster Bank customers via branch and on the phoneline 1850-424365," the spokesman said. 

Ulster Bank did not reveal how many accounts have been affected by the problem.

Michael McGrath, Fianna Fáil's finance spokesman, said IT glitches are happening far too often across the main retail banks in Ireland. 

"This trend is not acceptable given the real impact these events can have on bank customers," Mr McGrath said.

He said that a missed loan repayment can result in a black mark on someone's credit history with all the consequences that can lead to when they apply for a loan in the future. 

"The Central Bank needs to urgently conduct an industry wide audit of the IT systems of the main banks here to ensure they are fit for purpose," Deputy McGrath added. 

Earlier, Sinn Féin's finance spokesperson Pearse Doherty had said that Ulster Bank should provide emergency payments to customers who have not received salary payments to their accounts.

Mr Doherty called on Ulster Bank to identify the number of customers who have been affected by delayed credit payments to their customers' accounts.

He also called for the bank to provide immediate emergency payments for customers who have not received their salary payments and face the prospect of penalties due to unpaid debit payments and standing orders.