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The Council On State Taxation (COST) is the premier state tax organization representing taxpayers.  COST is a nonprofit trade association consisting of more than 600 multistate corporations engaged in interstate and international business.  COST's objective is to preserve and promote equitable and nondiscriminatory state and local taxation of multijurisdictional business entities.


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2014 Spring Audit Session / Income Tax Conference

April 27 - 30, 2014
Colorado Springs, Colorado
The Broadmoor

Click Here For More Information 


2014 Intermediate-Advanced Income & Sales Tax Schools

May 18 - 22, 2014
Grapevine (DFW), Texas
Hilton Dallas Lakes Executive Conference Center

Income Tax School - Click Here
Sales Tax School - 
Click Here 
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Mobile Workforce State Income Tax Simplification Act Introduced in Senate

S. 1645 was introduced on November 5, 2013 by lead sponsors Senator Brown (D-OH) and Senator Thune (R-SD).  The companion House bill, H.R. 1129, was previously introduced on March 13, 2013.  Join COST and more than 260 other companies and organizations in SUPPORT of a federal fix for nonresident state income tax withholding.

Click for Support LetterFAQ's and Detailed Information.