John has consulted with clients on state and local income and franchise tax matters since 2004. He has served businesses ranging from startups to Fortune 500 companies in the technology, professional services, financial, manufacturing, energy, and retail industries. Prior to joining Moss Adams, he practiced public accounting in the San Francisco Bay Area for 20 years.

John assists clients in identifying and implementing state tax planning opportunities, managing state tax filing requirements, and managing audits by tax authorities. He has worked closely with clients in interpreting and applying state apportionment rules as they relate to companies with multi-jurisdictional business operations.

External Publications

  • "State-By-State Apportionment Schedules Could Help Businesses Better Comply with State Laws" (Journal of Multistate Taxation and Incentives, June 2018)

Professional Affiliations

  • Member, American Institute of Certified Public Accountants
  • Member, California Society of Certified Public Accountants


  • BS, business economics, University of California, Santa Barbara
  • MS, taxation, Golden Gate University

Insights from John Clausen