Government plan to freeze the property tax could be illegal.
Finance minister Michael Noonan suggested last month the rate could be fixed at 2013 levels until the year 2019.
But according to the Irish Examiner accountants believe the move could face a legal challenge similar to that mounted in the 1980s over the old property tax.
The Director of Chartered Accountants Ireland, Brian Keegan, says using property valuations from May 2013 for the next four years will cause problems when house prices go up.
He's also warned that we could see homes marketed as pre-2013 to keep down tax payments.
