Does the app apply the double taxation agreement (DTA)? Anja Butenschön May 22, 2023 13:11 Updated No. Cases in which actual double taxation (DTA) would occur are not yet supported by our app. Related articles In which currency do I declare non-German income in Taxfix? Can I use Taxfix as an expat or relocator? Foreign, non-German capital gains in the tax return with Taxfix How is non-German income taxed in Germany? Do I have to file a tax return as an expat or relocator?