Guido Hassa

Senior Associate

Guido has more than 20 years’ experience in international taxation of corporate groups and banks.

In the course of his career, he has advised in particular on corporate structurings, ongoing corporate taxation and numerous inbound investments by non-domestic banking groups. Guido has broad experience in the field of tax compliance (e.g. tax declaration, tax reporting), field audit support, tax restructuring and withholding tax Issues.

Before joining A&O Shearman, Guido worked for several years as head of tax / tax senior manager for the German entities of a non-domestic banking group. Before that, he worked in the tax department of a major audit and tax advisory firm for over 10 years, rising to the position of manager, where he advised corporate and banking groups.



Pro bono

Advising /working with a German diversity association on taxation matters

Published Work

  • Guido Haßa / Martin Gosmann (2010) “Zweifelsfragen zu Konzernklausel und Verschonungsregel des § 8c KStG”, Der Betrieb 2010, page 1198 ff
  • Guido Haßa (2010) „Wachstumsbeschleunigungsgesetz: Verwertung von Verlusten nach dem 1. Januar 2010“, in „pwc: steuern + recht April/2010“

Speaking Engagements

  • Speaker of the taxation part within the training course for accountants, Forum-Institut, summer 2010

Leadership Positions And Professional Affiliations

Rechtsanwalt, Frankfurt Bar Association, Germany, 2000



Second German Law Degree, Ministry of Justice of the State Hessen, Germany, 1999

First German Law Degree, Georg August University Göttingen, Germany, 1996

A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.