As a domain expert in tax policy and law, I can provide you with a detailed explanation of who writes the tax code in the United States. The process of creating and revising the tax code is a complex one, involving multiple branches of government and various stakeholders.

Step 1: The Role of Congress
The U.S. Congress is the primary body responsible for writing the tax code. This is in accordance with the powers granted to Congress by the Constitution, specifically the power to levy taxes. The tax code is formally known as the Internal Revenue Code, and it is Title 26 of the United States Code. Members of Congress, particularly those serving on the House Ways and Means Committee and the Senate Finance Committee, play a significant role in drafting and revising the tax code.

**Step 2: The Influence of the Executive Branch**
While Congress writes the law, the Executive Branch, particularly the Department of the Treasury and the Internal Revenue Service (IRS), has a significant role in interpreting and implementing the tax code. The Treasury Department is responsible for issuing regulations that provide guidance on how to apply the tax laws. These regulations are often necessary because the tax code can be quite complex and may not cover every possible scenario.

**Step 3: The IRS and Tax Code Interpretation**
The IRS is the agency that enforces the tax laws and provides interpretations of the tax code through various means, including tax rulings, revenue rulings, and revenue procedures. These interpretations are important because they can clarify how certain provisions of the tax code should be applied in specific situations.

Step 4: The Judicial Branch and Tax Law
The Judicial Branch also plays a role in shaping the tax code through court decisions. When disputes arise over the interpretation of the tax code, they may be taken to court. The decisions made by the courts, especially the Tax Court and the appellate courts, can have a significant impact on how the tax code is understood and applied.

**Step 5: The Role of Tax Professionals and Scholars**
Tax professionals, scholars, and policy analysts also contribute to the understanding and interpretation of the tax code. They may provide expert testimony to Congress, write scholarly articles, or offer advice to taxpayers and their advisors.

Step 6: The Process of Tax Code Revision
The tax code is not static; it is subject to change as the economy evolves and as lawmakers seek to address new issues or correct perceived inequities in the tax system. This means that the process of writing and revising the tax code is ongoing.

**Step 7: The Impact of Lobbying and Special Interests**
It's important to note that the process of writing the tax code is also influenced by lobbying and the interests of various groups and industries. These groups may seek to influence lawmakers to include provisions in the tax code that are favorable to them.

In conclusion, the writing of the tax code is a collaborative effort involving Congress, the Executive Branch, the Judicial Branch, tax professionals, and various stakeholders. It is a dynamic process that reflects the changing needs and priorities of the nation.

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Rick remembered his lessons well. It's Congress, not the IRS, that writes the law, which is the official tax code. But what's commonly referred to as the tax code includes interpretations of the law by the IRS and Treasury Department, said Eugene Steuerle, a tax policy expert at the Urban Institute.Dec 7, 2015read more >>