The financial institution's chief executive, Michael Fingleton, is due to stand down at the end of this month.
Tomorrow's results have been anxiously anticipated.
Although Irish Nationwide is a building society, it operates as a lender to property developers.
That is a real problem for any bank in the current environment.
Its results for 2008 will show it has lent €8bn to commercial property but only €2bn to the residential sector.
Although its figures will say it make an operating profit of €260m, it has had to write off €460m due to bad loans, meaning it lost €240m last year.
The building society will also say it has €2.2bn of borrowings which must be repaid this year.
It will say its ability to repay the money will depend on an extension the Government guarantee.
