| Alabama Arise: Advocating a progressive taxation system for the state. |
| Americans for Tax Reform: Advocating for a national, single rate, flat income tax. |
| Banneker Center for Economic Justice: Essays, mailing list, and forum, questioning leading 'tax reform' proposals. |
| California Tax Reform Association: Non-profit organization advocating for state tax relief efforts and spending limits on government. |
| Canadian Tax Foundation: Independent, non-profit tax research organization analysing personal, corporate, and international tax and government finance matters. |
| Canadian Taxpayers Federation: Advocating for reductions in business tax and regulation, and increased transparency in the expenditure of tax revenues. |
| CapitolWatch: Advocating for tax reduction, and acting as a watchdog against perceived wasteful government spending. |
| Center on Budget and Policy Priorities: Public policy advocacy organization specializing in federal budget issues from a low-income perspective. |
| Citizens for a Sound Economy: Advocates market-based solutions to public policy problems. |
| Citizens for Tax Justice: Non-profit research and advocacy group focusing on federal, state and local tax policy. |
| Geonomy Society: Educational nonprofit offering news, commentary and analysis on the relationship between economics and sustainability. |
| Henry George Institute: Advocating the application of economic principles to local and international problems, and proposing the replacement of all income taxes with real estate taxes. |
| Institute for Local Self-Reliance: Article advocating heavy taxes on natural resources, such as coal, on the theory that this will reduce pollution. |
| Institute on Taxation and Economic Policy: Non-profit research group performing analysis, fostering debate, and educating the public on federal, state and local tax policy. |
| Massachusetts Budget and Policy Center: Statewide organization dedicated to advocating for tax fairness, economic justice, and socially responsible budgeting. |
| National Taxpayers Union: National taxpayer organization, lobbying Congress and state legislatures, and engaging in media activism in relation to tax issues. |
| Ohio Taxpayers Association: Non-profit organization seeking to limit state taxes, spending, and regulations, and promote the principles of limited government. |
| PETA - Tax Meat!: Proposing an excise tax on meat, on the belief that such a tax will benefit public health and the environment. |
| Robert D. Burch Center for Tax Policy and Public Finance: Established at the University of California, Berkeley, to promote research in tax policy and public finance. |
| Tax Foundation: Devoted to educating taxpayers about tax policy and the total tax burden borne by Americans at all levels of government. |
| Taxation Institute of Hong Kong: Seeking to promote the study and the exchange of information and views on taxation. |
| Tennesseans for Fair Taxation: Dedicated to creating a fair, progressive tax system that meets the state's financial needs. |
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