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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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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.

COST 's 2016 Scorecard on State Tax Appeals and Procedural Requirements

COST Issues 6th Scorecard which continues to apply objective criteria to evaluate independence in tax appeals systems and key procedural elements that impact taxpayers’ perceptions of fairness and efficiency.

Click here to view the study.  

Study: Total State and Local Business Taxes (FY15)

Businesses paid more than $707.5 billion in state and local taxes in FY2015, an increase of 1.9% from FY2014.  Click here for state-by-state and industry details of business taxes.

2017 COST Calendar of Events

The complete 2017 COST Calendar of National Conferences and Schools is available! 

• Mark Your Calendar • Invite Your Colleagues •

Click Here For More Information.