At the close of the Balkan War, Helfferich was the German financial delegate to the international conference (1913). He was Secretary for the Treasury from 1916 to 1917, and was said to be responsible for financing expenses for World War I through loans instead of taxes. He counted upon a final German victory and upon imposing heavy indemnities upon the Allies. He also served as Vice-Chancellor for Chancellors Georg Michaelis and Georg von Hertling.