Introducing Our Team

Accountants and advisors to Silicon Valley since 1979.

Byron Ishiwata, CPA

Tax Partner
Johanson & Yau

Review my background on FINRA’s BrokerCheck

Byron Ishiwata, CPA

Business Consulting
Estate Planning
Financial Statements
International Tax
Mergers & Acquisitions
Personal Financial Planning
Small Business Accounting
Succession Planning
Tax Authority Examinations
Tax Planning & Return Preparation


Professional Services
Real Estate


FINRA Series 7 & 66
California Insurance License #0E32247


American Institute of Certified Public Accountants (AICPA)
California Society of Certified Public Accountants (CalCPA)


Japanese-American Chamber of Commerce
Konko Church of San Jose, Head Minister
Japanese American Museum of San Jose, Board Member


Bachelor of Science – Commerce, Santa Clara University
Master of Business Administration – Taxation, Golden Gate University

“Personal service sets us apart.”

I joined Johanson & Yau in 1983 and became a partner in 2002. I specialize in serving individuals, corporations, partnerships and estates and trusts. I take great pride in personal service and enjoy helping clients meet their goals.

I’m avid sports fan and hold season tickets for all of the major teams in the Bay Area. I also serve as the assistant chief administrative minister for the Konko Churches of North America. I was born and raised in San Jose.


Securities offered through 1st Global Capital Corp. Member FINRA, SIPC. Investment Advisory Services offered through 1st Global Advisors, Inc. We have individuals registered to offer securities in the states of AZ, CA, CT, GA, MA, ME, NH, OR, PA, TX, VA, and WA. This is not an offer to sell securities in any other jurisdiction. Placing insurance business through 1st Global Insurance Services, Inc. Barbara Holian Kong, CFP® – CA Insurance #0A26929. David R. Davis, CPA/PFS – CA Insurance #0E01220. Frederick Leonard, CPA – CA Insurance # 0D52949. Sheryl Peterson, CPA – CA Insurance #0D84349. Byron Ishiwata, CPA – CA Insurance #0E32247. Elier Peraza, CFP® – CA Insurance #0K42603