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welcome to cost

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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2015 Intermediate-Advanced Income & Sales Tax Schools

May 17 - 21, 2015
Atlanta, Georgia
GA Tech Hotel & Conference Center

Income Tax School - Click Here
Sales Tax School - 
 Click Here 

Update on Mobile Workforce State Income Tax Simplification Act

Mobile Workforce H.R. 2315 introduced in the House on May 14, 2015.  Join COST and more than 270 other companies and organizations in SUPPORT of a federal fix for nonresident state income tax withholding. Please contact Maureen Riehl for more information.


COST Seeks West Coast Tax Counsel

COST has begun the search for a new West Coast TaxCounsel to replace Greg Turner.  If you are interested or know of a candidate, please click here for more information.