Fortsakis, Diakopoulos, Mylonogiannis & Associates Law Firm is well placed to handle tax disputes, with appearances before the Administrative Supreme Court, the Administrative Court of Appeal and the Administrative Court of First Instance. Practice head Petros Pantazopoulos brings expertise in tax and customs litigation, advising Greek and international corporates on VAT and income tax matters. Katerina Sideromenou, described as a ‘highly experienced professional’, contributes strength in tax and administrative law, alongside Katerina Kalampaliki and Athina Mavroeidi, who are also active in this field.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- ‘Petros Pantazopoulos has deep knowledge of tax law and administrative law.'
- ‘I have collaborated with Petros Pantazopoulos and Katerina Sideromenou. I would say that their main characteristics consist of their broad knowledge of their field, their capacity to understand and handle the issues in a holistic way and their willingness to listen carefully to their clients.'
- ‘What makes this practice unique is the combination of professionalism with a genuinely client-focused approach. The team demonstrates deep legal expertise while maintaining excellent communication, always ensuring that complex matters are explained clearly and that clients feel supported throughout the process. Compared to other firms, this practice stands out for its responsiveness and consistency in delivering high-quality advice.’
- ‘The individuals I have worked with stand out for their attentiveness, reliability, and commitment to achieving the best outcome for their clients. They differentiate themselves through their ability to combine strong technical knowledge with empathy and a practical approach, which makes collaboration both effective and pleasant. What I value most is their availability, clear communication, and proactive engagement.'
- ‘Katerina Sideromenou is a highly experienced professional, with an exceptional work ethic. She is a reliable professional who sees her client's needs as a top priority.’
- ‘What makes this legal team unique is their profound knowledge of the tax practice area, their client friendly approach as well as their prompt responsiveness and professionalism.'
Key clients
- Nova Telecommunications & Media Single Member S.A.
- Mars Hellas Single Member S.A.
- Lignitorycheia Achladas A.E.
- Museum of Cycladic Art
- Freeport Navigation Inc
- Piraeus Port Plaza 2
- Astir Pallas
- Alpha Leasing
- Alpha Leasing
- Viva Wallet
- Vodafone
- Pharmaserve - Lilly SACL
Work highlights
Represented Nova Telecommunications & Media Single Member SA in relation to a dispute with the Greek State regarding the imposition of a financial charge on the services rendered by the client.
Represented Enaon EDA HELLENIC GAS DISTRIBUTION COMPANY in relation to a dispute with the Municipality of Perama, following the annulment of the fees imposed on the client for the use of public underground areas for the year 2012.
Represented Astir Pallas in relation to its dispute with the tax authorities on the imposition of a fine amounting to €500,000 for an alleged failure of the company to comply with a request to provide specific tax documentation.
Lawyers
Leading associates
Leading associates with regular involvement in their team's key work, and recognition from peers or clients as being ones to watch.
Practice head
Petros Pantazopoulos
Other key lawyers
Katerina Sideromenou; Katerina Kalampaliki; Athina Mavroeidi