According to a ruling by the Federal Court of Justice on how to deal with fee changes, Deutsche Bank expects charges in the three-digit million range as early as this year.
The bank will probably set aside 100 million euros in the second quarter because of the decision against the Group's own Postbank, said CFO James von Moltke on Thursday at a conference of the investment bank Goldman Sachs turn out around 100 million euros lower.
The Federal Court of Justice recently ruled that banks must obtain the consent of their customers for changes to general terms and conditions.
The required tacit consent would inappropriately disadvantage customers.
Many customers can now claim back part of the overpaid fees from the past - according to Stiftung Warentest retrospectively until January 1, 2018.
According to the financial supervisory authority BaFin, the ruling could cost the banks in Germany dearly.
In the worst case, the decision could cost institutes an estimated half of the annual net income, the supreme banking supervisor and acting BaFin President Raimund Röseler said in May.