The Financial Police said on Monday that they have uncovered a scam that defrauded the state out of 12.8 million euros.
A total of 18 people are suspected of helping companies avoid paying social security contributions for their employees. The suspects are aged between 22 and 67.
The fraud was allegedly carried out between 2010 and 2013 and coordinated by a 54-year-old accountant.
The companies involved ran up an unpaid social insurance bill with the main IKA fund of some 5 million euros. They also owed some 7.8 million euros in value-added tax and other obligations to the state.