Tax Specific
Basic federal and state tax regulations and international agreements can be found by searching the following database
United States
FASB / ACS (Financial Accounting Standards Board / Accounting Standards Codification)
The Financial Accounting Standards Board (FASB) Accounting Standards Codification® (Codification or ASC) is the single source of authoritative nongovernmental U.S. generally accepted accounting principles (US GAAP)
GASB - Governmental Accounting Standards Board - standards for governmental accounting.
International
IFRS - International Financial Reporting Standards - the consolidated unaccompanied English language IFRS from the International Accounting Standards Board are available for free online. You will need to create an account to access the material.
Professional Standards
AICPA Professional Standards. Available on the AICPA website.
PCAOB Standards and Related Rules. Available on the Public Company Accounting Oversight Board's website.