The €6.7bn net loss comes as a result of €1.2bn in legal costs, as well as €800,000 in restructuring fees and severance pay, mainly for the retail bank for private and business clients.
The bank is expecting to report full year revenues of €33.5bn in its results next week, and a loss before tax of €6.1bn. This will be the bank's first full year loss since 2008.
Fourth quarter revenue is expected to fall to €6.6bn, from €7.8bn the year before. Deutsche blamed "challenging market conditions in the quarter" for a year on year fall in revenue for the fourth quarter, especially in the corporate banking and securities trading division. The bank said it expected a pre-tax loss of €2.1bn for the period.
Last year new co-chief executive John Cryan revealed Deutsche's investment bank was to be split into two parts, one focused on trading and the other on corporate finance and transaction banking.
A strategic overhaul at the bank is expected to axe 35,000 jobs over the next two years, shuttering operations in 10 countries and reduce the number of investment banking clients.
The full year figures also include provisions announced in the third quarter, including €5.2bn for litigation and €1bn for restructuring and severance costs.
The bank will release its fourth quarter and full year results for 2015 on 28 January.