The first of three reports due from AIB concerning recent scandals at the bank is to be published today.

The 20-page report, which was drafted by Deloitte and overseen by former comptroller & auditor general Mr Lauri McDonnell, will detail the extent of the overcharging that occurred in the bank in the period from 1996.

As well as outlining its extent, it will also detail the progress that has been made in returning money to customers affected. New areas of overcharging, over and above those already in the public domain, may be revealed.

Mr Liam O'Reilly, Irish Financial Services Regulatory Authority chief executive, is to hold a press conference this morning where he will comment on the inquiry's findings.

The bank has lodged €25 million with the Central Bank to cover repayments that may be required.

AIB chairman Mr Dermot Gleeson SC and chief executive Mr Michael Buckley will answer questions at a second press conference later this morning, also to be held in relation to the report.

It may be later this year before second and third reports addressing issues of concern at the bank are published.

The second report is expected to deal with the issue of how regulated charges could be exceeded by the bank and how this could remain the case over such a long period without it coming to the attention of senior management.

The third report will deal with the issue of systems and controls at the bank. It is unlikely the bank will deal with any changes that are to arise as a result of the scandals prior to the presentation of that report.

The bank has said very little concerning the scandals at the bank since the original statements issued by it earlier this year. One of the issues which is not clear is the extent to which the bank will explain what it has learned about developments in AIB Investment Managers (AIBIM).

An account managed by AIBIM on behalf of British Virgin Islands company Faldor was owned by five former senior executives at the bank, including the then chief executive Mr Gerry Scanlon. Mr Scanlon has said he did not know his funds had been moved to an offshore investment company.

Another former executive, Mr Roy Douglas, has said he thought involvement with the investment account was a benefit that came with the senior position he held within the bank. It was offered to him, he said.

It is not expected that the bank will expand further on these matters today.

Nor is it expected that it will shed further light on the "unacceptable deal allocation" practices that it has said occurred within AIBIM during the Faldor period.