WTS, an international full-service provider of tax and complementary financial advisory services, has partnered with the Polish tax consultancy firm WTS&SAJA. This transaction further expands the Eastern European footprint of the Germany-based company, which has entered into a long-term strategic partnership with the global private equity firm EQT, to build a European champion in the tax advisory industry.
Headquartered in Munich, WTS is one of the leading independent tax advisory firms in Germany, with annual revenues of over €250 million. WTS specializes in high-end advisory services for complex situations and counts 95 percent of the DAX40 companies, as well as numerous medium-sized global market leaders, among its clients. With a consistent technology- and AI-centric advisory approach, WTS is one of the pioneers of the digitalisation of the tax consultancy industry. Through its international network, WTS Global, the company is represented in over 100 countries.
In April 2025, WTS entered into a long-term strategic partnership with EQT to jointly build a European champion in the tax advisory industry with global reach. Through the transaction with Poland-based WTS&SAJA, the strategic partnership expands its reach in Eastern Europe, underscoring its ambition to further strengthen its presence in the region.
Founded in 2004 by former Big 4 partner Magdalena Saja, WTS&SAJA today employs more than 50 professionals in Warsaw and Poznań. Combining high-end advisory with comprehensive compliance and a technology-driven approach, the firm primarily supports multinational companies and corporate groups with a comprehensive tax advisory portfolio – from tax planning through restructuring and transaction services to tax litigation. WTS&SAJA has been a member of the WTS Global network since 2005.
“As a WTS Global member, we have maintained close ties with WTS for many years, and I am delighted that we are now further strengthening our partnership. WTS has a unique client base and an outstanding tax consulting portfolio. In particular, WTS’ technological expertise is exceptional. We will benefit from this and expect to significantly accelerate the expansion of our business in Poland and the broader CEE region.” comments Magdalena Saja, founder and Managing Partner of WTS&SAJA.
“Magdalena Saja and her team offer highly specialised, high-end tax consulting services and enjoy an excellent reputation in the market. I am pleased that WTS&SAJA and WTS are growing even closer together through this transaction, which will enable us to strengthen our market position and bring us closer to achieving our vision of becoming a European champion in tax advisory. And we don't intend to stop there, our inorganic growth agenda is in full swing with further milestones to be announced throughout the course of the year.” says Fritz Esterer, CEO of WTS.
The transaction was signed on 19 December 2025 and completed on 15 January 2026.
Media contacts
WTS&SAJA: Magdalena Saja, magdalena.saja@wtssaja.pl
WTS: Florian Kestler, florian.kestler@wts.de
EQT international media enquiries: Finn McLaughlan, EQT, finn.mclaughlan@eqtpartners.com
About WTS
WTS is a full-service provider of tax advisory and complementary financial advisory services. With more than 1,500 experts in Germany and one of the most advanced digital units worldwide, WTS develops innovative and integrated solutions to help tax and finance functions safely navigate increasing regulatory challenges and support them in the digital transformation.
WTS's range of consulting services is represented by the three business units Tax, Advisory and Digital. WTS deliberately refrains from conducting annual audits and is thus an independent and long-term partner.
WTS is represented in Germany at 11 locations and, through WTS Global, in more than 100 countries worldwide.
More Information: www.wts.com/de
About WTS&Saja
WTS&SAJA is a leading tax advisory firm in Poland and a member of the international WTS Global network. Guided by an entrepreneurial spirit, its advisors deliver practical, experience-based solutions that support clients in achieving their business objectives, combining high-end advisory with comprehensive compliance and a technology-driven approach.
WTS&SAJA offers a fully-fledged tax service portfolio and provides end-to-end support – from day-to-day tax matters to complex transactions, restructurings and strategic projects.
With a team of over 50 experienced professionals across two offices in Poland and access to more than 100 countries through WTS Global, WTS&SAJA combines deep practical expertise with global know-how. By integrating tax functions into core business processes and leveraging digital and AI-based solutions, WTS&SAJA ensures tax safety and operational relevance.
More Information: https://wtssaja.pl/en/
About EQT
EQT is a purpose-driven global investment organization with €266 billion in total assets under management (€141 billion in fee-generating assets under management) as of 30 June 2025, within two business segments – Private Capital and Real Assets. EQT owns portfolio companies and assets in Europe, Asia Pacific and the Americas and supports them in achieving sustainable growth, operational excellence and market leadership.
More Information: www.eqtgroup.com
