The AICPA is the world’s largest member association representing the accounting profession includes Audit & Accounting Guides, Professional Standards, and Technical Practice Aids
Financial Accounting Standards Board
The Financial Accounting Standards Board (FASB) is the designated organization in the private sector for establishing standards of financial accounting that govern the preparation of financial reports by nongovernmental organizations. Those standards are officially recognized as authoritative by the Securities and Exchange Commission (SEC) and the American Institute of Certified Public Accountants. A complete PDF version of their accounting standards is available at the link to the website.
The General Accounting Office performs audits and evaluations of Government programs and activities. Electronic reports of these audits and evaluations are available through this site.
Full text of the Internal Revenue Code (26 USC.) The Code is searchable and viewable, but there is no download or print capability other than that provided by the web browser being used to access it. (For easier downloading of particular sections of the code, go to Title 26 of the U.S. Code) This site is maintained by John Walker of AutoDesk, Inc.