Council On State Taxation Email Format

Think TanksDistrict of Columbia, United States11-50 Employees

The Council On State Taxation (COST) is a nonprofit trade association and think tank based in Washington, D.C., representing business taxpayers in state and local tax matters. Its membership comprises nearly 600 multistate corporations engaged in interstate and international commerce. Formed in 1969 as the Committee On State Taxation and renamed in 2000, COST pursues equitable and nondiscriminatory state and local taxation of multijurisdictional business entities.

The organization is described by a prominent tax policy expert as a leading influence in the state tax policy arena. It participates in policy events and maintains an active presence in the tax policy community, as shown by its attendance at the 2025 Spring Conference and Audit Session. COST's existence within the think tank ecosystem and its nonprofit status position it as a forum for multistate businesses navigating the complexities of state and local taxation.

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