- American Taxation Association
 - Tax educators, professionals, and doctoral students promoting excellence in tax education, research, and practice. - Capitol Watch
- Grassroots organization lobbies Congress on behalf of American taxpayers and against higher taxes and wasteful spending.
- Council on State Taxation
- Mission to preserve and promote equitable and nondiscriminatory state and local taxation of multijurisdictional business entities.
- Federation of Tax Administrators (FTA)
- Mission is to improve the quality of state tax administration by providing services to state tax authorities and administrators. Includes State comparisons, e-filing information, and links.
- Florida TaxWatch Research Institute
- Nonprofit, non-partisan institute which examines the tax and spend policies of Florida state and local government.
- Foundation for Taxpayer and Consumer Rights
- Deploys public interest lawyers, policy experts, grassroots activists, and others to advance and protect the interests of consumers and taxpayers.
- FTCR - The Foundation For Taxpayer & Consumer Rights
- Nonprofit, non-partisan consumer watchdog group tackles issues such as corporate accountability and citizen advocacy.
- Institute for Professionals in Taxation
- Educates, certifies, and establishes strict codes of conduct for property, sales, and use tax professionals who represent taxpayers.
- Institute for Research on the Economics of Taxation
- Conducts research and analysis of the economic effects of tax, budget, and regulatory policy initiatives.
- Internet Tax Fairness Coalition (ITFC)
- Alliance of business and industry groups that promote clear and simple tax rules for the borderless marketplace.
- Minnesota Taxpayers Association
- Educating and informing Minnesotans about sound fiscal policy and providing state and local policy makers with objective, non-partisan research.
- Multistate Tax Commission
- Organization of state governments that works with taxpayers to administer tax laws that apply to multistate and multinational enterprises.
- National Association of Computerized Tax Processors
- Contains links to the IRS and state sites which have tax forms available for download.
- National Association of Tax Practitioners
- Guide to education, research, and resources for tax professionals.
- National Campaign for a Peace Tax Fund
- National nonprofit organization that advocates for U.S. federal legislation enabling conscientious objectors to have their federal income taxes directed to a special fund which could be used for non-military purposes only.
- National Tax Association
- Nonpolitical, nonpartisan, nonprofit membership organization that aims to foster study and discussion of issues in tax theory, practice, and policy, and other aspects of public finance.
- National Taxpayers Conference
- Network of state-level taxpayer associations. Provides linkable map to state associations.
- National Timber Tax Website
- Presenting summaries of financial laws and information to assist consultants and timberland owners.
- Tax Executives Institute
- Organization of business professionals responsible for taxation matters on an administrative or policy-making level, or whose work is otherwise primarily concerned with the problems of business taxation.
- Tax Foundation, The
- Nonprofit, nonpartisan educational organization that monitors fiscal policies at the federal, state, and local levels.
- Tax Research Analysis Center
- Offers legislatures, municipal governments, and the public sector research and analysis in assessing taxation proposals and public finance issues.
- Taxgate
- Membership association dedicated to finding the truth to the complexities of the United States Income Tax.
- Texas Association of Assessing Officers (TAOO)
- Association providing educational courses for tax professionals.
- Unemployment Tax Advisory Corporation
- Processes claims and provides advice, seminars, training and specialized business consulting in managing unemployment compensation taxes.
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