On 20 April 2013, it was reported that Hoeneß was being investigated for tax evasion.[13] He was reported to have held a Swiss bank account for the purpose of evading taxes due on investment income, and to owe between €3.2 million and €7 million in taxes to the German state.[14] The reports came after journalists "gained access to a document meant only for internal use by tax officials."[15] Prosecutors from Munich carried out raids in offices of two Bavarian tax offices after Hoeneß filed a complaint.[15] Despite increasing public criticism, Hoeneß has remained in his position as president and chairman of the supervisory board of Bayern Munich.[16]
Hoeneß was accused of tax evasion[17] and his trial began on 10 March 2014.[17] The FC Bayern München AG supervisory board had a "unanimous opinion" that Hoeneß should continue in his role despite being sent to trial.[18]
During the trial, he admitted evading 28.5 million euros in taxes.