Member of the European Parliament, 2009–2018

In the European Parliament, Balz was a member of the Committee on Economic and Monetary Affairs (ECON), the Special Committee on the Financial, Economic and Social Crisis (CRIS) and the Parliament's delegation for relations with the countries of Southeast Asia and the Association of Southeast Asian Nations (ASEAN).^[2] In 2013, he served as the Parliament's rapporteur on Latvia’s accession to the eurozone.^[3] He joined the Special Committee on Tax Rulings and Other Measures Similar in Nature or Effect in 2015 and the Committee of Inquiry into Money Laundering, Tax Avoidance and Tax Evasion in 2016.

In addition, Balz was substitute for the Committee on Transport and Tourism (TRAN) and the parliament's delegation for relations with the People's Republic of China.^[2]

Member of the board of the Bundesbank, 2018–present

In early 2018, Balz was nominated to join the board of Germany's central bank, replacing Andreas Dombret.^[4]

Corporate boards

• Apaton Capital AG, member of the supervisory board (since 2007)
• ARAG Group, member of the advisory board (since 2014)
• Bausparkasse Schwäbisch Hall, Ombudsman (since 2012)
• MVI PROPLANT Nord GmbH, member of the advisory board (since 2014)
• Sparda-Banken, member of the advisory board (since 2012)

Non-profit organizations

• Baden-Badener Unternehmer-Gespräche (BBUG), member of the board of trustees
• Senckenberg Nature Research Society, member of the board of trustees^[5]
• Kangaroo Group, member^[6]