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In tax matters, a reliable and experienced partner is indispensable.
We stand for professional excellence in Swiss tax and accounting, combining technical expertise with a client-focused approach — both locally and internationally.
MEHR-COSSA Treuhand GmbH is a Swiss tax and accounting firm delivering professional, dependable and technically rigorous services in complex and highly regulated environments, both locally and internationally.
We support businesses and individuals in tax compliance, accounting and regulatory matters, combining expertise, precision and a disciplined, pragmatic methodology.

Company incorporation and domicile (canton Zug), group (re)-structuring advisory and sustainability support.

Comprehensive tax services, tax compliance and advisory, consulting, assisting firms and individuals on tax matters.

Accounting services covering bookkeeping, financial and reporting in an evolving regulated environment.

Assisting firms with the sustainability considerations, regulatory, reporting, and governance aspects.
We are proud serving our clients who are operational in a variety of industries and markets, in Switzerland, Luxembourg, EU.
Ms. MEHR-COSSA, LL.M., Director & Founder, is qualified Dipl. CPA, Registered Auditor (Revisorin) with Swiss Federal Audit Oversight Authority, and Judicial Sworn Expert at the Courts of Grand Duchy of Luxembourg.
With an extensive experience in the Big Four consulting, the international private sector, and with tax authorities, Ms. MEHR-COSSA, LL.M. leads client engagements with integrity and efficiency, delivering measurable results for our valued clients.
Please contact Ms. MEHR-COSSA, LL.M. direclty at office@mehr-cossa.ch
Don’t miss out on any significant events, essential updates, or exciting developments.
Please complete our request for proposal form.
Discover our approach to tax, accounting, and regulatory compliance in Switzerland and internationally.
We go beyond conventional solutions, offering a clear, strategic perspective designed to support your business’s long-term success. Through close partnership, we help you navigate complexity with confidence and precision.
Explore our concise insights and gain a fresh perspective on your tax, regulatory, and sustainable business challenges.
Feel free to contact us via WA for any questions requiring a quick response. We remain available: office@mehr-cossa.ch I +41 767 139 700. Business Center: Chamerstrasse 172 I Bahnhofstrasse 10, 6300 Zug Office: Bahnhofstrasse 10, 6300 Zug
MEHR-COSSA Treuhand GmbH I CHE-193.484.488
Chamerstrasse 172, 6300 Zug Switzerland I Direct Tel : +41 767 139 700 I Email: office@mehr-cossa.ch
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