COST membership consists of approximately 550 multistate corporations, representing approximately 70 different industries. COST serves as a wonderful resource of information and networking on all types of state taxes.  COST membership enables a company to stay current on state tax developments, work proactively on state tax issues impacting your company and share information resources with similarly situated members.  

Please contact Membership Coordinator, Judy Slotnik (p. 202.484.5227 or [email protected]) with any membership related questions.



To renew your company's membership online, follow the below steps:  

  1. Login to the COST Website.
  2. Click on your name in the top right corner of the page.
  3. Click on the "Company Dues" tab on the right.
  4. Click on "Pay My Company Dues" button.
  5. Click on the "Renew Now" button on the bottom left.
  6. Follow the prompts for entering credit card information and submitting.