Ulster Bank's operating profit slumped in the first quarter of this year as it put aside money to deal with "remediation and project costs associated with legacy business issues" here.
The bank reported an operating profit of €11m for the first three months of the year, down from €32m the same time last year.
Total income at the bank, which is owned by Royal Bank of Scotland, fell by 1.8% to €165m from €168m.
The bank said its operating expenses fell by €18m to €145m, which it said reflected a €35m reduction in costs relating to the bank's restructuring programme last year.
But this was partially offset by an €11m provision for those remediation and legacy issues.
In today's trading statement, Ulster Bank said that net loans and advances reduced by €300m in the first quarter to €21.7 billion.
Earlier this week, Ulster Bank confirmed that between 1,500 and 2,000 additional customers impacted by the tracker mortgage issue have been identified by the Central Bank's examination into the issue.
The bank had already identified 3,490 affected mortgage accounts.
It was also forced to apologise to customers when money "disappeared" from some accounts earlier this week.
Senior executives from the bank are to be asked to appear before an Oireachtas committee to answer questions about the problem which the bank said was due to "human error".
