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Onchinsuren Dendevsambuu
Country Managing Partner

Onch is a pioneer CPA in Mongolia and one of 18 CPAs in Mongolia who passed the first internationally recognized CPA examination in 1999.
Prior to founding Onch LLC, Onch worked at Arthur Andersen and Ernst & Young as a senior level auditor.

Onch has over ten years of extensive experience in auditing, accounting, and tax consulting for clients in the banking, transportation, energy, mining, manufacturing, and distribution sectors. 

She has the distinction of being the first and only Mongolian practicing accountant who has worked in Big 4 firms in Ulaanbaatar as well as in Moscow. She is a member of the Tax Working Group of the Mongolian Tax Authority, Head of Tax WG, Business Council of Mongolia and BOD, Tax payers’ Association.


Norjinbat Shagdarsuren
Consulting Leader

Norjinbat is a member or the Mongolian Institute of Certified Public Accountants and one of only 18 CPAs in Mongolia who passed the CPA examination in 1999. He is also a Certified application consultant of ACCPAC ERP software.

Norjinbat has over 10 years of experience in accounting, auditing of companies engaged in exploration and mining of mineral resources; transportation, distribution and banking sectors. He is also among the pioneers to receive extensive trainings in international accounting.


Nestor C UmbacNestor C. Umbac
Director, Consulting and Tax Compliance Services

Nestie has over 20 years of business consulting experience with Arthur Andersen in the Philippines, Saudi Arabia and Mongolia. He specializes in the design and implementation of financial systems for clients in the mining, telecommunications, energy, air transportation, manufacturing, and distribution sectors. Nestie has led major financial and operating systems projects in Mongolia.

Nestie co-manages Deloitte Onch Consulting’s consulting and tax compliance services. Nestie supervises financial reporting and Mongolian tax compliance for companies in the mining industry, professional service, construction materials. He oversees client accounting and financial reporting, statutory reporting, VAT and corporate income tax filing, payroll tax and social and health insurance filing.

He is a member of the Philippine Institute of Certified Public Accountants.