[1] During Hasler's term, the 2008 Liechtenstein tax affair took place, where millions of euros belonging to hundreds of citizens living in Germany were channeled into the LGT Bank and other banks in Liechtenstein,[7] taking advantage of Liechtenstein-based trusts to evade paying taxes in Germany.

[8] The affair overshadowed the previously-planned visit of Hasler to Berlin on 19 February 2008 to meet with the minister of finance, Peer Steinbrück, and the chancellor, Angela Merkel.

[9][10] Merkel asked for help in the investigation and cooperation in prevention of tax evasion, pointing out that Liechtenstein provided the US Internal Revenue Service with some data but not the German Ministry of Finances.

[12] As a result of the affair, Hasler's government entered negotiations with a number of countries to discuss tax avoidance issues.

[14] However, the election resulted in a victory for the Patriotic Union and Hasler resigned as prime minister on 8 February 2009, and was succeeded by Klaus Tschütscher on 25 March.