After returning to the US, she became a founding member of Bread and Roses, a socialist women's liberation organization in Boston, and joined the October League.

Tax's 1970 essay, "Woman and Her Mind: The Story of Daily Life", is considered a classic document of the US women's liberation movement.

[9][10] Tax's collected papers are at Duke University's Sallie Bingham Center for Women's History and Culture.

[13] She also wrote many political and literary essays, for The Nation, The Village Voice, The Guardian, Dissent, openDemocracy, and other publications.

[1][15] In 2022, Tax wrote about the need for a feminist movement on par with Occupy Wall Street and Black Lives Matter, which was disputed by the organizers of the Women's March.