Department profile
Mori Hamada

Tax

Asia-Pacific Guide 2026 : Japan

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Mori Hamada

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About

Provided by Mori Hamada

Our Tax Practice Group comprises both lawyers and a licensed tax accountant, including professionals who have held senior positions at the Japanese tax authority or otherwise have work experience there or at tax accountant corporations. Our team brings the necessary depth of experience to navigate this intricate and evolving area, ensuring our clients receive tailored advice that reflects the most current tax regulations and rulings. Our firm’s tax-related services cover a wide range of areas, including tax planning, wealth management, tax audits and tax litigation.

Chambers Review

Provided by Chambers

Tax - Japan

Band 1

What the Team is Known For

Mori Hamada is a trusted counsel for leading corporations including manufacturers and investment funds. The firm is often engaged by domestic and international clients on the tax aspects of M&A transactions and restructurings. The team is able to draw upon the expertise of accountants and former tax authority officials to provide comprehensive assistance to clients. It is also skilled at resolving contentious tax matters and assisting individual investors with issues concerning temporary income. The firm is additionally adept at capital markets transactions and its related tax implications.

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Work Highlights

Provided by Chambers

  • Mori Hamada advised a private equity firm on the taxation of individual fund managers of investment partnerships established by the client.

Strengths

Provided by Chambers

  • Based on their deep knowledge of the CFC tax system they provide prompt and accurate support in everything from tax audits to appeals and litigation.

    Tax respondentAsia-Pacific

  • Mori Hamada can utilise their wide network to provide advice from a political and diplomatic perspective and can communicate in a timely manner.

    Tax respondentAsia-Pacific

Notable Practitioners

Provided by Chambers

  • Atsushi Oishi
    Atsushi Oishi

    Atsushi Oishi

    Atsushi Oishi is a highly respected taxation expert with a broad offering spanning transactional and regulatory work, including transfer pricing and audit matters, with additional expertise in tax disputes.

    • We are grateful for his legal services, including his prompt and clear opinions.

      Tax respondentAsia-Pacific

    • When we're conducting consultations and building complex schemes, he's the first person we consult with.

      Tax respondentAsia-Pacific
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  • Makoto Sakai
    Makoto Sakai

    Makoto Sakai

    Makoto Sakai handles a broad range of tax mandates, including defending audits and challenging assessments by the National Tax Agency, in addition to a variety of contentious tax mandates. He also advises on the taxation elements of large-scale M&A deals.

    • He always has a good understanding of the situation we are in and provides us with appropriate advice.

      Tax respondentAsia-Pacific

    • He is the most knowledgeable lawyer I know, with strong expertise in cross-border taxes and succession planning solutions.

      Tax respondentAsia-Pacific
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  • Hiroshi Oyama
    Hiroshi Oyama

    Hiroshi Oyama

    Hiroshi Oyama is commended by clients for his ability to calibrate advice based on his experience as a former secondee of the Japanese tax bureau. His practice ranges from audit and transfer pricing advice to tax planning and litigation.

    • He has provided high-quality services regarding tax matters related to corporate restructuring, utilising his experience at the National Tax Agency.

      Tax respondentAsia-Pacific
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  • Hiroyuki Kurihara
    Hiroyuki Kurihara

    Hiroyuki Kurihara

    Hiroyuki Kurihara offers clients expertise in tax audits and tax planning for cross-border deals and disputes mandates.

    • He is an extremely skilled tax expert, which is a rare breed among law firms. He has earned our firm trust as an indispensable tax adviser.

      Tax respondentAsia-Pacific

    • Attorney Kurihara demonstrates his outstanding expertise in highly complex tax cases and always presents optimal solutions. He not only has a legal perspective, but also a commercial perspective.

      Tax respondentAsia-Pacific
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  • Akihiro Yamada
    Akihiro Yamada

    Akihiro Yamada

    Akihiro Yamada is a licensed tax accountant whose expertise is brought to bear for the firm's clients in his advice on tax planning and wealth management.

    • He is an experienced tax accountant with strong connections to the Ministry of Finance, the National Tax Agency and the Tokyo Regional Taxation Bureau.

      Tax respondentAsia-Pacific

    • Even in extremely complex tax cases he demonstrates accurate and precise analysis and practical skills, leading to consistent results.

      Tax respondentAsia-Pacific
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  • Koyo Madokoro
    Koyo Madokoro

    Koyo Madokoro

    Koyo Madokoro is a licensed tax accountant and partner at Mori Hamada. He advises on tax and wealth management, frequently for high net worth individuals.

    • He has an extremely deep understanding of the industry and a wealth of knowledge that only insiders have.

      Tax respondentAsia-Pacific

    • He has a deep understanding of each and every aspect of tax matters, ensuring that every detail is included in the scheme.

      Tax respondentAsia-Pacific
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Ranked Individuals at Mori Hamada (6)

Japan

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