Our Experts

Our team of leading experts

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Riana, Ak, M.Ak,CA.,BKP(Senior Partner)

Riana is a certified tax consultant of the Indonesian Tax Consultants Association (IKPI) and a Chartered Accountant of Indonesia (IAI) with extensive experience
in accounting and taxation. She also holds a license as a tax legal representative from the Directorate General of Taxation. With over 17 years of experience in accounting and taxation, she has worked in various businesses such as exportimport (Forwarding Int’L Company) and Trade Fair Organizer companies. Her experience has led her to become a tax supervisor in several companies, a speaker in various seminars, a tax instructor, and a lecturer at Universitas Bunda Mulia. Additionally, she has served as a Senior Head of Tax Accounting at PT Agung Sedayu Group

team 3 mtaxindo.com
Tassha Billy Gunawan, S.Ak, BKP(Partner)

Tassha completed her Bachelor’s degree in Accounting from Universitas Multimedia Nusantara in 2016 and completed her AB & C Brevet education in 2015 at the Indonesian Institute of Accountants (IAI). In 2018, Tasha became a certified tax consultant A, and in 2020, she became a certified tax consultant B. Since 2018, Tasha has assisted many taxpayers in fulfilling their tax obligations, both for individuals and entities.

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Eko Budi Santoso, S.E.(Senior Partner)

Eko is a graduate of the State Finance Polytechnic (PKN STAN) and holds a bachelor’s degree from Institut Perbanas Jakarta. He started his career in the government institution of the Tax Court from 2010 to 2019. With 10 years of experience in the Tax Court, Eko has extensive experience in examining and analyzing various tax disputes and customs disputes. His experience enables him to see disputes from two perspectives, namely the perspective of taxpayers and the state. This dual perspective is valuable in handling tax disputes.


Agustina Mappadang completed her Bachelor’s degree majoring in Accounting at Samratulangi University – Manado, Master’s degree at Trisakti University – Jakarta and earned is Doctorate degree with a dissertation in taxation at Pancasila University – Jakarta. Experienced as a practitioner handling Taxation, Finance and Accounting. Apart from that, he has competence as a Trainer and has a Securities Broker Representative certification. He is a member of the Indonesian Capital Markets Lecturers Association (IDPMI), the Indonesian Public Accountants Association (IAPI) and the Accounting and Economic Management Forum (FAME).

Apart from that, he has a license as a Tax Consultant from the Ministry of Finance, Directorate General of Taxes and is a member of the Indonesian Tax Consultants Association (IKPI).

He is also a speaker in the fields of Finance, Accounting and Taxation in various forums at universitys. Country and University. Private, Institutions, Government agencies and in various Private Companies.

He is also one of the Instructors in Continuous Professional Development (PPL) at the Indonesian Tax Consultants Association.

Previously joined the Public Accounting and Management Consultant Firm KPMG Sudjendro Soesanto & Co. (Member of Klynvield Peat Marwick Goerdeler). He has worked for more than 25 years in various industrial, property & service companies in Indonesia, including Singapore and Malaysia as a Controller.

He is also active in writing articles on the topics of Corporate Governance, Tax, Audit, Finance, Risk Management which are published in International Journals including Scopus indexed International Journals and also published in SINTA-DIKTI accredited National journals.

Like is from publishing journals, he is also active in writing on the Kompasiana blog as an observer of economic and social issues that are currently trending in society. Apart from that, he is also diligent in writing books, namely:

  • Completely examine the tax aspects of notaries/PPATs
  • Investment and Portfolio Management
  • Effect of Tax Avoidance and Profit Management on Company Value
  • Accounting Theory

Meet our great team

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