Bank of Ireland has written to a number of its personal account customers advising them that they are more overdrawn than they actually are.
The figures in the letters were wrong because the bank did not write decimal points in the figures for the customers' total overdrafts.
This had the effect of making a €21.00 breach of an overdraft limit look like €2,100.
The letters were sent to customers who exceeded their overdraft limits for 30 days or more.
The letters are required under new Consumer Credit Regulations, which came into effect last month.
In a statement this afternoon the bank confirmed that some of the letters it issued to customers last week contained an error whereby the decimal point was left out.
The bank said it wishes to apologise and 'give assurances that this is an isolated incident affecting only certain customers'.
It said it is in the process of issuing the correct letter, with an apology, to the affected customers.
