A joint investigation by the companies has found that Ghosn, ousted as chairman from both automakers, received the compensation without discussing it with the two other board members of the joint venture, Nissan CEO Hiroto Saikawa and Mitsubishi Motors CEO Osamu Masuko.
Nissan holds a controlling stake in Mitsubishi Motors.
Ghosn, arrested and detained in Tokyo since Nov. 19, has been indicted in Japan on charges of under-reporting his salary for eight years through March 2018, and temporarily transferring personal investment losses to Nissan during the global financial crisis.
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