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The Internal Revenue Code, along with the US Constitution, represents the highest source of authority in tax matters.
Treasury regulations are created by the executive branch of government. There are three types of Treasury regulations:
1) Legislative (under direct authority assigned by the US Congress)
2) Interpretative
3) Procedural.
An international organization that establishes and regulates international trade rules and practices.
The United States federal agency responsible for administering and enforcing tax laws.
The professional organization that represents certified public accountants in the US is the American Institute of Certified Public Accountants (AICPA).
FASB is the private not-for-profit organization that develops and updates generally accepted accounting principles in the United States.