Links 

Federal Tax:

• Internal Revenue Service
• IRS Office of Safeguards
• United States Department of the Treasury

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State Tax:

• International Fuel Tax Association, Inc. 

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State and Local Government Organizations:

• Council of State Governments
• International City Managers Association
• National Association of Counties
• National Conference of Commissioner's on Uniform State Laws (NCCUSL)
• National Conference of State Legislatures
• National Governor's Association 
• National League of Cities
• U.S. Conference of Mayors

Tax Organizations:

• Center on Budget and Policy Priorities
• Council on State Taxation (COST)
• Federation of Tax Administrators
• Institute for Professionals in Taxation
• National Tax Association
• TaxExchange
• Tax Executive Institute 
• Tax Foundation
• Tax Policy Center  
• Streamlined Amnesty
• Streamlined Registration System
• Streamlined Sales Tax Governing Board, Inc.

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Continuing Education and Conferences

• American Law Institute - American Bar Association (ALI-ABA)
• Georgetown University Advanced State and Local Tax Institute
• NYU Institute on State and Local Taxation
• Paul J. Hartman State and Local Tax Forum