
Described by clients as having ‘exceptional’ ability, GSG Attorneys at Law/GSG Hukuk, an independent law firm in the PwC Global Network, offers market-leading tax services. Some of the largest multinational and digital economy clients choose the team for its expertise in tax disputes and transfer pricing matters, in addition to tax aspects of major corporate transactions. At the helm of the team is veteran tax practitioner Ezgi Türkmen. Supporting the team are Gülcan Çalışkan and Yeşim Dikici Orhan. Öykü Öcal, focused on international and digital services taxation, and Talya Erden, an expert in tax and customs disputes, are also key contacts.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- ‘They remain respectful, responsive and always reachable. Their work quality consistently impresses.’
- ‘Talya Erden remains professional and kind throughout long engagements. Her consistency never drops.’
- ‘Gülcan Çalışkan and Öykü Sağlam give reliable advice and stay available, even for last-minute needs.’
- ‘Their tax expertise is exceptional - they integrate tax specialists effectively with a strong experience across tax disputes.'
- 'Ezgi Türkmen is a well known expert in the field of tax law - always ready to listen, adapt and deliver clear guidance even in complex tax structures and regulations.'
- ‘GSG excels through expertise, responsiveness and client care. Their technology-driven processes increase efficiency.’
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

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
Ezgi Türkmen
Other key lawyers
Gülcan Caliskan; Öykü Öcal; Yeşim Dikici Orhan; Ecehan Altınöz Karabıyık; Öykü Naz Sağlam; Talya Erden

