Coronavirus Update

Certain government jurisdictions have placed restrictions on working in the office and have affected our offices listed below. Our staff who work in these offices will be working from home and will continue to serve the needs of our clients. We hope to limit the impact this will have on our clients and appreciate your patience and understanding at this time.

Affected offices:
New Jersey (Hackensack)
Los Angeles
San Jose

EOS File Exchange(EFE)

EFE is a system that allows for safe exchange of information between us and our clients. In order to protect the data of our valued clients, we recommend the use of EFE. By using this system, clients can access a protected area where they can download their files securely and conveniently.

EOS File Exchange

Individual Tax Web Input

“Individual Tax Web Input” is a system used by our clients to enter necessary information, which upon submittal, is used by EOS to prepare tax returns.

Web Input


We are pleased that you are taking the time to view our web site and become acquainted with our firm and the various services we provide. If you should have any questions, we invite you to contact any one of our executives who would be pleased to explain in greater detail our firm and our services.

EOS History

EOS has been serving Japanese owned companies doing business in the U.S. since its formation in 1996. Our firm was established through the transfer of a segment of Ernst & Young’s Japanese business practice. We currently have approximately 150 employees working in our nine locations throughout the U.S. and Japan. As we work primarily with businesses investing and operating in the U.S., we are able to focus our resources to better meet the needs of our clients and aim to provide a more hands-on approach to client service. EOS provides a full range of services including, but not limited to, attestation (audit, review, and compilation), corporate and individual tax, bookkeeping and payroll support.

Originally based in Teaneck, New Jersey, in 2014, we relocated our headquarters to Hackensack, New Jersey to accommodate our growing company. In addition to serving as our headquarters, the New Jersey Office serves our East Coast clients. As we gained traction, we established our first Silicon Valley Office in 1999 in San Jose followed by the establishment of our Los Angeles Office in March 2003. In December of 2003, we opened our Honolulu Office and in October of 2006, added our second Silicon Valley Office in San Mateo. Together, the San Jose, Los Angeles, Honolulu, and San Mateo Offices serve our West Coast clients. Our Detroit Office opened its doors in February 2007 and our Chicago Office was established in June 2010 to serve our Mid-West area clients. In 2012, we opened our Tokyo Representative Office to liaison with the headquarters of our Japanese-owned clients. In 2014, we opened our Houston Office to serve our clients in Texas and surrounding areas.

In 1996, EOS began with three Partners and four employees. In the 20 years since then, our business and size have expanded as well as our service capabilities. Today, there are 19 Partners and Principals and about 150 employees firm-wide. We look forward to the continued support of our clients as we move beyond our 25th anniversary in 2021

Service Line

EOS provides a full range of services including, but not limited to, attestation (audit, review, and compilation), tax, bookkeeping and payroll support. We also assist larger corporations and audit clients of the Big Four accounting firms by supporting our clients with their audits, providing services that the Big Four firms either cannot provide or that can be supplied more efficiently by a smaller firm, or through the teamwork of EOS and the Big Four.

Assurance and Accounting Services
  • Audit, Review and Compilation of Financial Statements
  • Internal Control, Assistance with J-Sox Integration
  • Support for the Financial Statement Audit
  • International Financial Reporting Standards (IFRS) Assistance
  • Accounting Support Services
  • Mergers and Acquisitions Advice/Due Diligence
  • Other Accounting Advisory Services
Tax Services
  • Corporate, Partnership, and Non-Profit Organization Income Tax Return Preparation
  • Individual Income Tax Return Preparation
  • Tax Provision Preparation and Assistance
  • ASC 740 Analysis and Support
  • Non-Income Tax Assistance (Sales/Use, Property, and others)
  • Assistance with IRS and State Tax Audits
  • Tax Planning and Consultation
Transfer Pricing Services
  • Transfer Pricing Documentation Reports
  • Advance Pricing Agreements (APAs)
Payroll Services
  • Payroll Tax Processing and Registration Services
  • Payroll Tax Advisory Services
  • Gross Up Services

Accounting / Tax News


ASC 842 New Lease Accounting

Non-Financial Foreign Entity (NFFE) Information Reporting and Withholding under FATCA (Foreign Accounting Tax Compliance Act)

Office Locations

Our firm headquarters in Hackensack, New Jersey serves our East Coast clients. Our Detroit Office located in Novi, Michigan and our Chicago Office located in Rolling Meadows, Illinois serve our Midwest clients. Our San Jose Office located in Santa Clara, San Mateo Office, Los Angeles Office located in Torrance, California, and our Honolulu Office serve our West Coast clients. Our Tokyo Representative Office liaisons with the headquarters of our Japanese-owned clients and our Representative Office in Tennessee serves our clients in the Southern part of the United States.


Continental Plaza 10th Fl.
401 Hackensack Ave. Suite 1001
Hackensack, NJ 07601
(201) 836-3710
(201) 836-5873


39555 Orchard Hill Place
Suite 440
Novi, MI 48375
(248) 347-3260
(248) 347-3261


1701 Golf Road
Suite 3-200
Rolling Meadows, IL 60008
(224) 836-6900
(224) 836-6901


Ashford Crossing II
1880 S. Dairy Ashford, Suite 237
Houston, TX 77077
(832) 390-2422
(713) 804-6369


4675 Stevens Creek Blvd.
Suite 130
Santa Clara, CA 95051
(408) 441-0655
(408) 441-0657


2050 West 190th Street
Suite 210
Torrance, CA 90504
(310) 217-9900
(310) 217-9990


500 Ala Moana Blvd.
Suite 7-240
Honolulu, HI 96813
(808) 599-7949
(808) 800-2946


Marunouchi Trust Tower Main 20th Fl.
1-8-3 Marunouchi
Tokyo, Japan
(03) 5288-5241







Audit/Accounting YASUKA KOTANI






Audit/Accounting MIKA YOSHIMURA



Staff Interview

Tristyn Nishibun

Tristyn Nishibun
Office Honolulu Office, Tax Department
Hobby Basketball and Music

I was born and raised in Honolulu, Hawaii and graduated from the University of Hawaii at Manoa in Spring 2019 with a bachelor’s degree in accounting. I first gained interest in EOS at the office tour held for UH Manoa Accounting Club. I then applied and was offered a position as a tax intern. After my internship, I continued to work at EOS part time until graduating in 2019. After graduating, I accepted a full-time position as a tax staff. I am currently studying to obtain my CPA license.

Growth at EOS

I worked part-time for EOS for almost three years and began working full-time in June 2019. Going from student intern, to part-time staff, to full-time staff, the transitions have been smooth. EOS prepared me well and treated me like a staff from the very beginning, which has given me the opportunity to expand my knowledge in accounting and grow as a professional.

At EOS, I continue to gain a better understanding of tax and receive advice, which has helped me gain professional wisdom for my first full-time job. We are pushed to research new tax concepts and challenge ourselves to understand new concepts without always being told the answers. As a staff, I appreciate the level of encouragement and assistance from the upper-level management to guide us, staff, toward advancing in our careers.

Why EOS?

I chose EOS because I am surrounded in an ever-learning environment, and I am very well supported by my team. I have been constantly challenged with new tasks while working in an environment that allows me to freely seek advice and guidance. I feel that these opportunities are rare in a typical CPA firm.

At EOS, the employees are taken care of and the firm is always looking for ways to improve, both firmwide and at the Honolulu branch. They push and incentivize us to obtain our CPA licenses, which shows they are looking out for our well-being and advancement. It’s reassuring to work with a company who cares for their employees.

Yu Yang

Yu Yang
Office Detroit Office, Audit Department
Career Born in Fujian, China. Began working at EOS in October 2009.
Hobby Photography and running

I was educated in China and received an MA in material sciences and engineering from the University of Science and Technology, Beijing. However, my real interest was in accounting because I am, by nature, analytical and good with numbers. Once in the United States, I chose accounting as my career and earned a Master’s of Science in Accounting. Within six months, I passed the CPA exam and found I had a real passion for the subject. I believe accounting is the common language for all businesses and that there are countless opportunities for people with accounting backgrounds.

Why I Decided to Become an Auditor

Before joining the EOS team, I had no experience in accounting, but after a few years I gained enough experience and became a senior staff. I enjoy trouble-shooting and solving complex problems. I now lead my own audit team. Working closely with my colleagues, I look into issues, think about solutions and apply the best one as quickly as possible.
My work ethic is strong because I know my supervisors, clients and audit team all count on me. Auditing takes special skills because the accountant must work independently while keeping in touch with the client’s head office. I have to understand not only a company’s financial data, but also have a feel for its business and the industry in which it operates.
I believe I handle the daily pressures of our business and meet tough deadlines because I'm well organized, reliable, good at planning and efficient. I'm currently in charge of several mid-size clients in multiple locations. I also assist the tax department with some corporate tax work.

What Skills I Have Learned

When I started at EOS, my ambition was to become an audit manager within five years. I am on track to achieve this goal and am looking forward to advancing my career with EOS. In the coming years, I aim to expand my audit team and provide excellent service. Working here has allowed me to develop my skills and gain valuable experience rapidly. While working at EOS, I've polished the following skill sets: leadership, analytical, communication, research and problem solving.
Accounting is not a static discipline; change is inevitable, and I welcome the challenge of keeping up with new legislation and standards. I improve my skills by self-study and coursework. In my spare time, I enjoy photography and running. Photography fulfills my creative needs and running ensures physical fitness. Together they keep my personality in harmony.

Randy Teguh

Randy Teguh
Office Honolulu Office, Tax Department
Career Joined EOS in May 2015
Hobby Volleyball

I was born and raised in Southern California. I attended California State University, Long Beach in 2008 where I became an officer of the CSULB chapter of Beta Alpha Psi, an international honor organization for accounting, finance and information system students. During my senior year, I interned for a local CPA firm which I eventually earned a full time position for after I graduated in 2011. I gained experience in both taxation and auditing over the next 4 years while obtaining my CPA license in the state of California. In May of 2015, my wife and I moved to Hawaii to be closer to her family. Two days later, I began working for EOS.

Why I Decided to Become a Tax Professional

I gained a lot of experience in both tax and audit early in my career. I believe that having a background in either department makes you a stronger candidate for the other. The first two years of my career really made it tough to decide which route I wanted to go in as both sides had their pros and cons. Ultimately, I decided to stay in tax. I felt that enduring long hours away from home for projects that can last weeks at a time was not very conducive for raising a family. Additionally, having the satisfaction of completing a lot of smaller projects more often outweighed the satisfaction of completing a few large projects. I enjoy the advisory side of tax and the value added aspect it can bring to clients. I got into the profession with the intention of helping people and I felt that this was better accomplished in tax.

What Skills I Have Learned

As I mentioned earlier, having experience in both audit and tax has really helped me grow as a professional. From a tax perspective, I’ve touched on a large array of clientele including Corporations, S Corporations, Partnerships and LLCs, high net-worth individuals, expatriates, nonresidents, and even a non-profit organization here and there. Even though each type of client is different and no two clients are the same, I’ve carried all sorts of concepts and logic from one client to the next. Whether it’s something technical or just learning how to interact with clients or colleagues, experience is the only way to effectively learn in this profession. The most important skill I needed to pick up was learning how to organize myself. There is no class or one-size-fits-all template on organization. I quickly realized how unorganized I was when I first started and how it really can hold you back. Finding a system that worked for me really propelled my career. Additionally, through my years of experienced, I’ve gained a level of proficiency in software and IT that I’ve been able to implement in everyday practice, improving office organization and workflow.

Why EOS?

I chose EOS because it has given me the freedom and the tools to master my craft. Shortly after starting at the Honolulu office, I was promoted to senior and was tasked with training and supervising the newer staff on developing their skills as tax professionals. Within 3 years, I have advanced to Tax Manager which confirms that EOS truly recognizes their employees’ efforts. I was given opportunities to further my knowledge of tax applications and implement new, efficient systems in an already established office while still maintaining flexibility with my personal life outside of the office. Everybody here is treated as a professional and has the freedom to take their career however they want. The opportunity for advancement is very real if the effort and drive are there. I believe that hard work deserves to be recognized and with EOS, I truly feel appreciated for what I do.