Sebastian Breth Arnberg

Attorney
Sebastian Breth Arnberg

Sebastian Breth Arnberg specialises in tax law with a particular focus on disputes with the Danish tax authorities, including complaints and lawsuits before the Danish courts.

Sebastian also advises a wide range of Danish and international companies and real-estate funds on all tax and company law aspects in connection with the sale and purchase of companies and real estate. 

In addition, Sebastian is a part-time lecturer in tax law at the University of Copenhagen and an editor at Karnov (the leading provider of compilations of Danish statutes) in its international-tax team.

Qualifications
Education
Admitted to the Danish Bar
2023
Master of Law, University of Copenhagen
2019
Summer school, London School of Economics, London
2018
Studies at Université Libre de Bruxelles, Belgium
2015
Memberships

The Danish Lawyers’ Tax Law Association

The Danish Branch of the International Fiscal Association

Experience
Career highlights

Attorney, DLA Piper Denmark, since 2025

Attorney, NJORD Law Firm, 2023-2025

Assistant Attorney, NJORD Law Firm, 2022-2023

Head of Section, the Department of the Danish Ministry of Taxation, 2019-2021

Intern, Confederation of Danish Industry, Brussels, Belgium, 2018-2019

Law Student, Danish Industry, 2017-2018

Other positions

Part-time lecturer, University of Copenhagen, since 2023

Editor, Karnov Group, since 2023