Your next stage in Japan begins here.
Accounting and tax for foreign companies - handled directly, in English, by the professionals.
Sugiyama & Co, CPA
supports every client aiming to reach to a new stage as a professional firm.
From setting up your business in Japan to serving, we work as your tax agent for international clients, we meet full range of accounting and tax needs foreign corportation face in Japan — and every conversation happens directly in English.
When a matter calls for specialist expertise, we draw on our domestic and international networks to bring in exactly the right people.
The list below is example of our services. Whatever your circumstances, we'll shape our support to fit them.
These are the areas we most often help with:
- Setting up your Japanese corporation
- Preparing and filing tax treaty notifications
- Tax agent services for non-residents
- Tax audit support and representation
- BEPS Master File and Country-by-Country Report (CbCR) filing
- Tax and accounting reporting to your parent company
- Individual income tax return filing and year-end statutory reporting for stock options, RSUs, and similar
- Accounting support under US GAAP and IFRS in response to overseas HQ requirements
- Transfer pricing advisory
- Anti-tax-haven (CFC) rules advisory, Tax review of commercial contracts with foreign companies, including affiliated entities
- Review commercial contracts with foreign companies, including affiliated entities from tax view point
Profile
Founder | Partner (JCPA/JCPTA)
Masahiro Sugiyama
1975
Graduated from Keio University, Faculty of Business and Commerce
1976
Passed the Certified Public Accountant (CPA) Second-Stage Examination; Joined Deloitte Touche Tohmatsu (currently Deloitte Touche Tohmatsu LLC) Tokyo Office
1982–1985
Seconded to the Sydney Office in Australia
1987
Established Sugiyama CPA Office
2001–2003
Appointed as the first Comprehensive External Auditor for Minato Ward, Tokyo
2007
Established KS & Associates LLC, providing M&A and management consulting services
2008
Established Sugiyama Certified Public Tax Accountants' Corporation
2012～2013
Served as a JETRO International Tax Advisor
Member of Yokohama Country Club and Tokyo American Club
Partner (JCPA / JCPTA)
Ruriko Takeuchi
2007
Graduated from Keio University, Faculty of Economics
2005–2011
Engaged in statutory audits and various advisory services at KPMG AZSA LLC
2009
Registered as a Certified Public Accountant (CPA)
2011–2015
Engaged in financial and management accounting at Unilever Japan Holdings K.K. (Seconded to Vietnam in 2014)
2015
Registered as a Certified Public Tax Accountant; Joined Sugiyama Certified Public Tax Accountants' Corporation
2018–2023
Engaged in IPO preparation, management accounting, internal controls, and auditing at UiPath K.K. and several other startup companies
2023
Appointed as Outside Corporate Auditor at LogProstyle Group Inc. (Current)
2024
Appointed as Outside Corporate Auditor at TSUNAGU GROUP HOLDINGS Inc. (Current)
2026
Appointed as Outside Director, Audit & Supervisory Committee Member at TANSEISHA CO., LTD. (Current)
ABOUT US
Full support for foreign companies, built on decades of trust.
For more than 30 years, we've helped foreign-affiliated companies grow and succeed in Japan. Today, international businesses make up over half of our clients, and many have worked with us for years. They stay for the reasons they first came to us: consistently high-quality work, careful attention to detail, and genuine fluency in English. We offer one-stop support shaped around what you actually need — incorporation of your Japanese company, running your back office, handling international tax on cross-border transactions, and filing taxes for your expatriate staff.
Our long experience sits alongside modern ways of working: your numbers stay current, your reporting fits the systems your headquarters already uses, and working across borders is second nature to us. You work with us in English throughout. Your reports, calls, and emails are handled directly by the qualified professionals doing the work. When it helps, we'll join calls with your overseas headquarters and discuss matters in English.
For every client ready for what's next — ready to expand globally.
International tax is our specialty, but it isn't the whole picture. Alongside it, we handle the everyday essentials — tax advisory, payroll, and the accounting your operations rely on — and, when you're weighing an acquisition, provide the financial and tax due diligence to support the decision. Rather than stopping at routine compliance, we draw on decades of experience as Certified Public Accountants to offer strategic advice from a management perspective.
We're at our best when you're stepping into something new: investing overseas, entering cross-border transactions with foreign partners, or building out your presence in Japan. Whatever the next stage looks like, we help you move toward it with confidence.
ACCESS
6F Asakawa Bldg., 2-1-17 Shibadaimon, Minato-ku, Tokyo 105-0012, Japan
2-minute walk from Daimon Station (Toei Oedo / Asakusa Line)
6-minute walk from Hamamatsucho Station (JR Yamanote Line)
7-minute walk from Shibakoen Station (Toei Mita Line)