After graduation and served as collector of taxes for Copenhagen in 1920s, Buhl joined an active member of the Social Democratic Party, entered parliament in 1937.

29 January 1880 – d. 11 March 1959), and they had four children: Søren Peder Thygesen (1910–1975), Knud (1911–1991), Gerda Martha Magdalene (1914–1993), and Jens (1915–1986).

In the beginning of World War II and the Nazi occupation of Denmark, Thorvald Stauning created as a Unity government.

Many Danish people were dissatisfied with politicians because of their policy of cooperation with Germans that had dominated at the start of war, hence the inclusion of resistance fighters.

Notable members of Buhl's liberation cabinet were included Aksel Larsen, Hans Hedtoft, H. C. Hansen, Knud Kristensen, and John Christmas Møller.

After October 1945 elections, Buhl resigned from office on 7 November, and he was replaced by Knud Kristensen, who became as a new prime minister.