a&o accta ortag ag

6340 Baar
Offices in: 
+41 41 749 40 90
+41 41 749 40 91

The companies a&o accta ortag ag, Baar (formerly ACCTA Accounting & Tax AG1), a&o KRESTON ortag ag, Zurich (formerly ORTAG AG2) and Esther Holm GmbH3, Horgen, which date back as far as 1946, were merged in 2016 into the present form of the a&o Group. (Subsequently, a&o accta ortag ag, a&o KRESTON ortag ag and Esther Holm GmbH will be referred to as a&o Group.)

While a&o accta ortag ag focuses on the classic fiduciary services of accounting/bookkeeping, tax and legal consultancy, HR services/administration and business consulting, a&o KRESTON ortag ag specialises in the area of auditing; it is accredited as an audit expert under registration number 500250.

a&o accta ortag ag, Baar and a&o KRESTON ortag ag, Zurich are members of “Kreston International”, a global network of independent accounting firms, and will represent this network  across German-speaking Switzerland.

The a&o Group is managed by the senior partners Alfred Fehlmann, Dr. Manuel Vogel and Roger Werner. Four long-standing members of staff are now taking on responsibility as junior partners: Camille Suter, Joe Reichmuth, Emre Özdemir and Gabriel Zimmermann.

With more than 30 qualified members of staff, including experts in the areas of audit, fiduciary, tax, national and international VAT, employee/earnings and social insurance, we provide comprehensive, professional and customised advice and support for both our national and international clientele (companies and private individuals).

Our membership of the inter-trade organisations EXPERTsuisse (formerly the Swiss Institute of Certified Accountants and Tax Consultants), Treuhand|Suisse, the “Kreston International” global network, as well as co-operation with other national partners, continuous development and the exchange with our partners enable us to provide the best service to you. 

1) ACCTA Accounting & Tax AG, Baar (Canton of Zug), was established in 2010 as a spin-off of another trust company. ACCTA was held and managed by Dr. oec. Manuel Vogel, a renowned expert in international tax accountancy and VAT.

2) Ortag, Organisations-, Revisions- und Treuhand AG, Zurich, was established in 1946. The company was held and managed for many years by Roger Werner, who primarily works in the areas of business consulting and bookkeeping, and by Alfred Fehlmann, who specializes in the area of auditing and tax.

3) Esther Holm GmbH, Horgen (Canton of Zurich), was established in 1996 and over the years, it was built up and managed by Mrs Esther Holm.

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