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If you are a tax professional and would like to find out how COST can help you do your job better, click below.

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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 nearly 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.


featured news

2013 Spring Audit Session / Income Tax Conference

May 20 - 22, 2013
New Orleans, Louisiana
Ritz Carlton

Click Here For More Information 

COST Releases 2013 Sales Tax Study on Business Services

"What's Wrong with Taxing Business Services?" - This study, prepared for COST by Ernst & Young LLP, addresses key tax policy issues arising in a number of state legislatures that are debating proposals to significantly expand the sales and use tax base to include substantially more business-to-business sales.  
Click here for the full study.

Mobile Workforce

The Mobile Workforce State Income Tax Simplification Act was introduced March 13, 2013 as  H.R. 1129.

Join COST in SUPPORT of a federal fix for nonresident income tax withholding.
Click for Support Letter, FAQ's and Detailed Information.