Office of Tax Policy OTP

While the IRS collects taxes and enforces the tax code, the Office of Tax Policy, led by the Assistant Secretary for Tax Policy, advises the Treasury Secretary and the President on what the tax laws should be. It develops the tax proposals in the President's budget, analyzes bills moving through Congress, and testifies before the tax-writing committees, the House Ways and Means Committee and the Senate Finance Committee.

Its Office of Tax Analysis employs economists who estimate how much revenue the administration's proposals would raise or lose and study how taxes affect the economy and different income groups, work that parallels the official scorekeeping done for Congress by the Joint Committee on Taxation. After Congress passes a tax law, the office works with the IRS Office of Chief Counsel to write the Treasury regulations and guidance that tell taxpayers how to apply it, published in an annual priority guidance plan.

The office also negotiates income tax treaties with other countries to prevent double taxation and represents the United States in international tax talks at the OECD, including negotiations over a global minimum tax on large corporations. In 2025 it was responsible for guidance implementing the year's major tax law, the One Big Beautiful Bill Act, and for international talks that sought to exempt U.S. companies from parts of the global minimum tax framework.