The newest investigation focuses on family trusts in the German state of North Rhine-Westphalia, the Süddeutsche Zeitung reported. The trusts are suspected of hiding illegally earned – and untaxed – business gains.
The sums involved could range between €10 million and €20 million, the newspaper said.
The newspaper quoted an investigator as saying charges could be filed in 20 cases.
Officials have been quietly conducting about 30 investigations since Easter, the newspaper reported, including searches of 120 homes and offices around Germany.
The German government admitted in February to paying informant Heinrich Kieber more than €4 million ($6 million) for bank data on residents who had hidden money in Liechtenstein. The resulting tax fraud probe was the largest ever in Germany.
United States, Britain, Australia, Italy, France, Sweden, Canada, New Zealand, Greece and Spain also opened investigations into whether residents had hidden money in Liechtenstein.