Company Name: Sincere Accounting Office

​

URL: https://sincere-accounting-consulting.com/cpa/

​

Address: 

• Japan (Tokyo Headquarters): 3F Expert Office Kojimachi, 2-10-3 Kojimachi, Chiyoda-ku, Tokyo, Japan

• Japan (Osaka Branch): 12F Tokyo Tatemono Umeda Building, 1-12-12 Umeda, Kita-ku, Osaka-shi, Osaka, Japan

• Thailand (Bangkok): 50/265 Soi Krung Thep Kritha 7, Huamak, Bangkapi, Bangkok, Thailand

• Vietnam (Ho Chi Minh City): 54, Street No. 56, Binh Trung Dong Ward, Thu Duc City, Ho Chi Minh City, Vietnam
  ​

Established: 

• July 1, 2019 (Kumagai Certified Public Accountant & Tax Accountant Office, now Sincere Accounting Office, and Thailand office)

• October 2020 (Japan entity: Sincere Accounting Consulting Japan Co., Ltd.)

• January 2024 (Vietnam entity: SIncere Consulting Vietnam Co., Ltd.)​​

 

Number of Employees: 

​​

Business Description:

Accounting, tax, and management consulting services centered on offices in Japan, Thailand, and Vietnam, as well as business expansion support for companies entering Southeast Asia.

​​

Main Products or Services:

• Tax and Accounting: Bookkeeping services, tax filings (corporate and individual), tax advisory services, tax planning, and financial advisory.

• Audit and Consulting: Statutory and voluntary audits, IPO support, internal control system development, and IFRS implementation support.

• International Services: Accounting and tax advisory services required for business operations in Vietnam and Thailand, and comprehensive overseas expansion support.

​

Strengths & Advantages:

• Extensive Southeast Asia Practical Experience: The firm’s representative has spent four years stationed in Thailand, Vietnam, and Cambodia, directly engaging in local accounting, tax, and market entry support.

• Cross-Border Support Structure: With in-house offices in Japan (Tokyo and Osaka), Thailand, and Vietnam, the firm is well equipped to handle international taxation and IFRS-related engagements.

• Management Philosophy “Three Sinceres”: Guided by the values of “compassion,” “a sincere attitude toward challenges,” and “self-awareness,” the firm is committed to closely supporting clients’ visions and goals.

• Strategic Partner for SMEs: Rather than acting solely as an administrative service provider, the firm serves as a trusted strategic advisor focused on cash flow–driven management decisions, enabling business owners to concentrate on their core operations.

​​

Target Customers:

Japanese small and medium-sized enterprises expanding into Vietnam or Thailand, as well as domestic SMEs seeking growth and a reliable management partner who can act as a strategic advisor.

Sincere Accounting Office can be described as a “companion for companies venturing overseas.” By removing the complexities of accounting and taxation in unfamiliar markets through professionals with deep local experience, the firm enables clients to focus confidently on their core business activities—their voyage—without distraction.