NY Office 
About Us
Our Mission
With more than thirty years of professional experience, we assist our clients in each and every stage of their continuous growth. We develop efficient and flexible solutions to support them in achieving their business goals. That's our mission.
Quality Services
We provide the international business community both in the U.S.A. and Japan with quality bilingual (Japanese/English) accounting, tax, payroll and advisory services to over 100 domestic and international clients. Our clients range from a number of industries from large worldwide corporations and SEC listed US companies to local import/export retailers.
Company Profile
Harnessing our more than 30 years of combined experience, we established Oshima Saito LLP in January 2001 with the desire to provide our customers with efficient, customized, and goal-oriented service.
With headquarters in New York City, and branch offices in Los Angeles and in Shibuya, Tokyo (opened January 2001 and October 2008, respectively), we are able to serve our clieants globally.
Our staff is made up of highly experienced American Certified Public Accountants and Japanese Certified Public Accountants with expertise in matters of banking, law and audits. We offer expert knowledge and guidance for a range of accounting needs, including corporate finance management, personal investments, and estate,inheritance and gift tax.
We have provided advisory services, and met the accounting and tax needs of a wide range of clients from private enterprises and small businesses, to international corporations. Our target clients do business in both U.S.A. and Japan, and our staff is able to assist clients in both Japanese and English.
The best feature of our firm is that all three of our international offices will work together to optimally serve you. If you are in Tokyo, with a branch in New York, or vice versa, we can facilitate easy communication in real time without the inconvenience of time differences or language barriers.
Joe Oshima, Partner
Certified Public Accountant in the U.S.A. Graduate of Aoyama Gakuin University. Graduate of New York University (MBA).After comitment as a partner in Tax Department of KPMG New York for 25 years, he established his own accounting practice. He has decades of experience serving banks, trading companies, manufacturers and other Japan-based entities with subsidiaries and branches in the U.S.A. He has offered his consultation services on matters of audits and taxation. He is one of the first Japanese tax experts to specialize in the American international taxation. On January 1st 2003, he merged his office with Koki Saito & Co. He is now a partner of Oshima Saito LLP.
He has appeared in, and written countless articles on taxation issues, in newspapers and journals. He has published books entitled “American Tax Basics,” “Q & A, the American Tax Encyclopedia,” and “The American Tax Handbook for Japanese People and Businesses.”
Koki Saito, Partner and CPA in U.S.A. & Japan
Certified Public Accountant in the U.S.A. and Japan. Graduate of Otaru University of Commerce, Major in Commerce and Economics. Entered Century Audit Corporation (now known as Ernst & Young Shin Nihon LLC), one of the “Big Four” accounting firms in Japan. In 1992, he was assigned to the firm’s Los Angeles office. While in the U.S., he studied American accounting at the University of Southern Caifornia, Los Angeles. He then moved on to KPMG in New York, where he worked as Senior Manager in the audit department. In January 2001, he established Koki Saito & Co. in New York and Los Angeles. On January 1st 2003, his firm merged with Oshima Accounting Offices. He is now a partner of Oshima Saito LLP.
- 1991: Became a Certified Public Accountant in Japan
- 1995: Became a Certified Public Accountant in the state of California
- 1996: Became a Certified Public Accountant in the state of New York
Naomi Wada, Manager
- U.S. Public Accountant
- Manager in Tokyo office
- BA in History and Science, Tokyo Women's Christian University
- 2007: Became a Certified Public Accountant in the state of New Hampshire
Takeshi Ozeki, Manager
- Certified Public Accountant in California ( certified in 2006. )
- Manager in New York office
- BA in Economics, Osaka Prefecture University ( Japan )