Royal Bank of Scotland today said it had resolved a glitch which delayed around 600,000 payments for customers.
The bank, which owns Ulster Bank here, said it was "extremely sorry" for the problem which affected all four of its banking brands - NatWest, RBS, Ulster Bank and private bank Coutts.
"We can confirm that the issues customers were experiencing in relation to delayed credits and debits have now been resolved and accounts have been updated," a spokesman said.
"We are extremely sorry for the inconvenience and distress that this has caused our customers," he said.
"If any customers are still experiencing issues please contact our call centres or come into a branch where are our staff are ready to help. We will continue our work to make sure that no customer will be left out of pocket as a result of this issue," he added.
The bank faced a barrage of customer complaints after it admitted earlier in the week that delayed banking payments may not show up in accounts until the weekend. The issue also affected some tax credits and disability living allowances.
The banking group has been hit by a number of embarrassing IT glitches in recent years. In 2013, RBS's online service was disrupted by a denial-of-service attack.
Last November, the state-backed group was hit with a £56m fine from the Bank of England and City watchdog Financial Conduct Authority after a computer failure in 2012 saw as many as 6.5 million customers unable to make payments for as long as three weeks.
The outage hit customers at NatWest and Ulster Bank especially hard.
Yesterday, RBS said it will invest around £150m a year to improve the resilience of its computer systems.
