Most charities tend to be incorporated as companies, limited by guarantee.
If that is the case, they will be required to file their full audited accounts to the CRO each year.
Go to and enter the charity name (perhaps tick the button for "both" where it says "search for... company name / business name / both").
If / when you find the right company details, you can "view the list of submissions", and if you see "Account Details" listed then you'll be able to view them, at €2.50 or €3 a pop.