COST Membership

COST Calendar

Use our COST Calendar to find events in your area!

COST Staff

Meet the COST staff and find out what they can do for you!

join cost

COST membership is exclusive; only multistate businesses that are not engaged in tax advising or consulting may apply for corporate membership.  Once a member of COST, a business will enjoy numerous benefits, including:

  • Premier staff training – from entry-level positions to senior executives
  • Shared technical knowledge of other members and practitioners on complex state tax issues
  • Unparalleled networking opportunities
  • Extensive state tax advocacy efforts
  • Important updates on state tax news and legislation
  • A voice in national state tax affairs
  • Much more

COST membership is on a company basis with a three-tier dues structure.  The tiers and the corresponding dues level are based on revenue as follows:

Revenue Under $2 Billion*


Revenue $2 - $25 Billion*


Revenue Over $25 Billion*


"Annual revenue" includes the revenue of all affiliates/entities served by the corporate tax department.

"I have been with COST member companies for almost 10 years and have found that the organization gets better and more valuable each year.  COST is our source for timely state tax issues and our educational resource for staff development.  Its legislative efforts, peer-to-peer relationships, educational programs and regional meetings means there is something for all companies."
Cole Mills – C&S Wholesale Grocers, Inc., Keene, NH