Which type of membership is right for you?
COST membership is exclusive; only multistate businesses that are not engaged in tax advising or consulting may apply for corporate membership. Companies are encouraged to include tax, legal, finance and government affairs in the membership.
Practitioner Connection is a program for law, accounting and consulting firms and service providers to partner with COST.
Individuals from a member company can sign up to be added to their company membership. If you are not affiliated with a current member, you will be added to the COST database.