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

State Tax Filing Relief for Victims of Hurricanes Harvey and Irma

COST is pleased to be working with the AICPA to compile and maintain a chart tracking state guidance on filing relief for victims of Hurricane Harvey and Hurricane Irma. Please click here to view the most recently updated chart, and please contact David Sawyer for more information.


Study: Total State and Local Business Taxes (FY16)

Businesses paid more than $724.1 billion in state and local taxes in FY2016, an increase of 0.9% from FY2015.  Click here for state-by-state and industry details of business taxes.


UPDATE: Mobile Workforce State Income Tax Simplification Act Passed U.S. House on June 20

We are pleased to announce that on June 20, the U.S. House of Representatives passed the Mobile Workforce State Income Tax Simplification Act of 2017H.R. 1393, by voice vote on Suspension Calendar. The Mobile Workforce legislation, S. 540 and H.R. 1393, was introduced on March 7 by the lead sponsors from the 114th Congress: Senators John Thune (R-SD) and Sherrod Brown (D-OH), and Representatives Mike Bishop (R-MI) and Hank Johnson (D-GA). For more information or to get involved in efforts to enact the Mobile Workforce Act, please contact Doug Lindholm or the Mobile Workforce Coalition.