cost membership

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

Events Calendar Job Bank

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.

featured news

NOTICE: COST Website Maintenance

PLEASE NOTE:  The COST website is undergoing maintenance, beginning November 30.  While the work is being conducted, there will be limited access, including no login.  Once the upgrade is complete, several enhancements will be available for an improved user experience, including new user profile fields, ability to renew online and more.  The site should be restored for regular access by the morning of December 2.  We apologize in advance for any inconvenience.  If you need help, please call (202) 484-5222 or email


Study: Total State and Local Business Taxes (FY14)

Businesses paid more than $688 billion in state and local taxes in FY2014, an increase of 2.2% from FY2013.  Click here for state-by-state and industry details of business taxes.

Update on Mobile Workforce State Income Tax Simplification Act

On June 17, 2015, the U.S. House Judiciary Committee held a mark-up and passed HR 2315, the Mobile Workforce State Income Tax Simplification Act, by a vote of 23-4.  H.R. 2315 has more than 100 bipartisan cosponsors, and the 275+ member Mobile Workforce Coalition is focusing lobbying efforts on House leadership to schedule a floor vote for the bill.  For more information or to join the Mobile Workforce coalition efforts, please contact  Maureen Riehl, COST Vice President of Government Affairs.