There’s a small section in the local property tax legislation which is very relevant to the self employed.
For example a single person with self employed income of €50,000 would pay approximately €16,781 in income tax. If your local property tax return isnt filed your income tax return can be hit with a late filing penalty. This penalty starts at 5% and after two months goes up to 10%.
So in the case above the late filing penalty could be €1,678 + interest on the local property tax + penalties.
This penalty appears to be capped at the amount of the local property tax due:
Full details :