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

Mobile Workforce State Income Tax Simplification Act Approved by House Judiciary Committee

We are pleased to announce that on March 22, 2017, the House version of the Mobile Workforce State Income Tax Simplification Act of 2017, H.R. 1393, passed the House Judiciary Committee markup by a vote of 19-2. The Mobile Workforce Act, 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). The legislation is similar to legislation (H.R. 2315) that passed the House in the 114th Congress last September. 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.