Policy Influence COST is described as the most influential nongovernmental organization in state tax policy, representing nearly 600 multistate corporations. This suggests a strong potential for partnerships around policy monitoring, compliance tooling, and advisory services tailored to large multistate taxpayers.

Membership Base The organization comprises 11-50 employees but serves a large corporate membership base. A sales approach could target COST member companies with value propositions oriented toward state tax risk assessment, benchmarking, and cross-jurisdiction tax optimization solutions.

Digital Outreach Tech stack includes Microsoft 365, SendGrid, and Azure, indicating active digital communication and enterprise collaboration. Opportunities exist to offer compliance education, email campaigns, and secure data sharing platforms that integrate with their existing tools.

Recent Activity Active participation in events such as the 2025 Spring Conference and Audit Session signals ongoing member engagement and potential for sponsorships, event tech, and sponsored research or whitepapers that align with COST’s policy priorities.

Guidance Resources Past initiatives like Coronavirus pandemic State Tax Filing Guidance show willingness to publish and update resources. There is potential to collaborate on research, training programs, or subscription-based knowledge platforms that support state tax professionals.