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  1. Tax code, regulations and official guidance - Internal Revenue …

  2. Tax law | Definition, Types, & Examples | Britannica Money

  3. Tax law - Wikipedia

  4. Tax law questions - Internal Revenue Service

  5. Taxation in the United States - Wikipedia

  6. How the U.S. Tax Code Works and Its Sections - Investopedia

  7. Tax Policy - U.S. Department of the Treasury

  8. Income Tax | Wex | US Law | LII / Legal Information Institute

  9. Federal Tax Law: A Beginner's Guide - Library of Congress

  10. Tax Law and Policy - Harvard Law School | Harvard Law School