Americans for Fair Taxation
This group advocates a Fair Tax plan based on a single-rate sales tax. Includes membership info, FAQs and links to related sites. 

Americans for Tax Reform
A national clearinghouse that advocates repealing the income tax. Includes information on social security reform and the flat tax.  

Association for Computers & Taxation
The nonprofit educational organization is dedicated to helping tax professionals. Includes a conference calendar, publications and a membership survey report. 

Chartered Institute of Taxation, The
This London-based institute offers tax facts and advice. Includes tax conference info, FAQs, software and links to related sites. 

Citizens for an Alternative Tax System
Advocates a national retail sales tax. Includes a library, tax news, membership info and a public forum. 

Citizens for Tax Justice
"A research and advocacy organization dedicated to fair taxation at the federal, state and local levels." Includes a publications list, FAQs and press releases. 

Deloitte & Touche Center for Multistate Taxation, The
The Center for Multistate Taxation at the University of Wisconsin-Milwaukee was founded in 1996. Serves as a focal point for research and education on state and local tax issues. 

Florida Tax Watch Research Institute
Founded in 1979, the nonprofit tax watchdog and research institute offers reports on state and local government topics. 

National Association of Computerized Tax Processors
Represents tax software and hardware developers, electronic filing processors, tax form publishers and tax processing service bureaus. Includes downloadable tax forms and links to related sites. 

National Association of Tax Practitioners
Members include CPAs, individual practitioners, enrolled agents, accountants, attorneys and financial planners. NATP's Tax Research Center assists member with federal and state tax questions. 

National Taxpayers Union
Founded in 1969, NTU is the largest grassroots taxpayer organization. Includes articles, news updates, publications, membership info and links to related sites. 

North American Society of Tax Advisors
Offers international tax information to advisors and consultants the U.S., Canada and Mexico. Includes a directory and an overview of international tax legislation and regulations. 

Southern Federal Tax Institute, Inc.
Access details about this nonprofit corporation organized for the exclusive purpose of developing a professional institute covering current federal tax problems and issues at the post-graduate level. 

Tax Foundation
Founded in 1937, the nonprofit tax policy research organization monitors fiscal issues at the federal, state and local levels. Includes tax policy updates and publications.