[3] Clausing has worked on economic policy research with the International Monetary Fund, the Hamilton Project, the Brookings Institution and the Tax Policy Center, and she has testified before the House Ways and Means Committee and the Senate Committee on Finance.

[4][5][6] She criticized the 2017 Tax Cuts and Jobs Act of 2017, arguing that "the bill replies to decades of worsening income inequality with arguably the most regressive tax policy change of our lifetimes" and that "the bill answers our huge problem of multinational company profit shifting by increasing the incentive to offshore.

"[7] Clausing has provided informal policy advice to Oregon Senator Ron Wyden, a long-time supporter of tax reform.

[9] In March 2019, Clausing published her first book, Open: The Progressive Case for Free Trade, Immigration, and Global Capital.

[11] Later that year, she was nominated and confirmed to the position of Deputy Assistant Secretary for Tax Analysis at the U.S. Department of the Treasury.