Senior Manager

Jun Tamahashi, CPA

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Meet Jun

Jun has over 15 years of experience in international tax for individuals with assets in multiple countries, specifically Japanese high net worth clients with assets in multiple countries. She has extensive knowledge of tax issues related to the U.S. and Japan, including those involving complicated passive foreign investment companies (PFICs), foreign entities serving foreign and U.S. corporations and partnerships with overseas activities, as well as high net worth individuals with cross-border tax issues, with a focus on the Japanese market.

Her expertise includes international tax compliance (5471, 5472, 8621, 8865, 8858, 2555, 926, 1120F, 1042, 1118, 1116, W-8, FBAR), subpart F, PFIC, Sec. 956, Sec. 987 calculations, cross-border restructuring, voluntary disclosure program assistance (OVDP, Streamlined Compliance Procedures, and Delinquent International Form/FBAR Submission Procedures), ASC 740 tax provision and FIN48 analysis, tax controversy, tax planning and research and consolidated and multistate tax returns.

Jun studied at Chuo University in Japan and is a Certified Public Accountant. She is a member of the AICPA and is a current board member for both the Japan-America Society and the Hawaii Tax Institute.


Professional History


  • American Institute of Certified Public Accountants (AICPA)
  • Japan-America Society
  • Hawaii Tax Institute


  • Japan-America Society, Board Member
  • Hawaii Tax Institute, Board Member


  • Chuo University (Japan)


  • Deloitte Touche Tohmatsu LLC

Speaking Engagements

  • Japan-America Society of Southern California Seminars
    • May 1, 2020, Los Angeles, CA, online, “Covid-19 Relief Provisions and BE-10 Mandatory Foreign Investment Reporting”
    • June 10, 2020, Los Angeles, CA, online, “FBAR and Offshore Penalties and Possible Relief Programs”

Contact Jun Tamahashi

Jun's Thought Leadership
Blog articles
The complexities surrounding operating a business can make state registrations confusing to taxpayers.

June 05, 2020
Blog articles
With new provision taxpayers may choose to make certain elections to waive carryback periods.

April 20, 2020
Updated August 10, 2022
Blog articles
Here’s a list of highlights from the CARES Act that are relevant to businesses and individuals.

March 31, 2020