Sincere Accounting Office
Accounting Firm (Tax and Management Consulting)
Sincere Accounting Office
Sincere Accounting Office has offices in Japan (Tokyo and Osaka), Thailand (Bangkok), and Vietnam (Ho Chi Minh City), and specializes in supporting the international expansion of Japanese companies through accounting, tax, and management consulting services. Led by a certified public accountant and tax accountant with extensive practical experience in Southeast Asia, the firm provides hands-on support for local legal and tax compliance as well as market entry.
Companies considering expansion into Vietnam or Thailand, as well as Japanese companies in a growth phase seeking a trusted management partner who can act as a strategic advisor.
Profile
Company Name: Sincere Accounting Office
URL: https://sincere-accounting.com/ Website URL has changed!
Address:
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Japan (Tokyo Headquarters): 3F Expert Office Kojimachi, 2-10-3 Kojimachi, Chiyoda-ku, Tokyo, Japan
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Japan (Osaka Branch): 12F Tokyo Tatemono Umeda Building, 1-12-12 Umeda, Kita-ku, Osaka-shi, Osaka, Japan
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Thailand (Bangkok): 50/265 Soi Krung Thep Kritha 7, Huamak, Bangkapi, Bangkok, Thailand
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Vietnam (Ho Chi Minh City): 54, Street No. 56, Binh Trung Dong Ward, Thu Duc City, Ho Chi Minh City, Vietnam
Established:
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July 1, 2019 (Kumagai Certified Public Accountant & Tax Accountant Office, now Sincere Accounting Office, and Thailand office)
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October 2020 (Japan entity: Sincere Accounting Consulting Japan Co., Ltd.)
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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.
Services:
Accounting and Bookkeeping Support
• Bookkeeping services (creation of accounting records based on receipts, invoices, etc.)
• Bookkeeping review (verification of accounting entries and instructions for correcting errors)
• Preparation and review of monthly financial statements.
• Preparation of annual financial statements and financial closing support.
• Support for streamlining and improving accounting operations
Tax Compliance and Tax Review
• Preparation and submission of corporate tax, consumption tax, business tax, etc.
• Tax review (verification of tax processing and declaration details)
• Tax consultation, tax saving strategies, and advice on tax risks.
• Year-end tax adjustment, statutory reports, and depreciation tax return.
• Filing various notifications and applications with the tax office and responding to tax audits.
Business support and financial assistance
• Support for fundraising and cash flow management
• Support for business plan and budget development
• Business improvement support through sales, profit, and cost analysis
• Support for fundraising and dealing with financial institutions
• Support for establishing and improving management control systems
International accounting and international tax consultation
• Accounting and tax consultations regarding overseas expansion and business development.
• Tax advice on international transactions
Overseas expansion consulting
・Consultation regarding expansion into Thailand and Vietnam
・Examination of overseas expansion models and business schemes
・On-site inspection support and market research
・Research and introduction of local partners and business partners
Overseas market development and sales support
・Test marketing support
・Overseas sales agency
・Exhibition participation and management support
・Support for developing local sales agents and business partners
・Business negotiation and business matching support
Local business operation support
・ Consultation regarding business operations on-site
・ Support for collaboration with local partners and external experts
・ Support for logistics and import/export
・ Other local business support services
BPO for the accounting department
・Outsourcing of accounting operations
・Support for monthly, quarterly, and annual financial closing operations.
・Support for preparing consolidated financial statements and disclosure documents
・Support for streamlining accounting operations and accelerating financial closing.
Accounting and cost accounting consulting
・Support for the introduction of new accounting standards
・IFRS implementation and transition support
・Establishment and improvement of cost accounting systems
・Development of management accounting and budget management systems
Internal control consulting
・Support for the establishment and development of internal control systems
・J-SOX compliance and evaluation support
・Creation and improvement of business process flows, business descriptions, and RCMs.
・Support for improving internal control deficiencies
Support for various procedures such as company establishment, visas, and work permits.
We provide support for all procedures necessary for starting and running a business in Vietnam, including establishing a local subsidiary, obtaining visas and work permits, and applying for various licenses and permits.
Bookkeeping and tax filing services
We provide bookkeeping services based on Vietnamese accounting standards and tax laws, as well as monthly and annual financial statements, and various tax filings including corporate tax, VAT, and personal income tax.
Accounting and Tax Review
We verify the accuracy of local subsidiaries' accounting practices and tax filings, identify accounting and tax issues and risks, and provide advice for improvement.
Accounting and tax consulting
We provide support for corporate management, including expert consultations on accounting and tax matters, establishment of accounting systems, management of tax risks, and handling of tax audits.
Legal Consulting
We provide legal support necessary for the operation of local subsidiaries in Thailand, including contract-related work, corporate law, and compliance with various laws and regulations.
Strengths & Advantages:
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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.
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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.
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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.
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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.
Management Philosophy
Sincere Accounting Office values the three principles of “Sincere,” embodying sincerity and integrity.
Compassion
An organization that brings happiness to everyone involved
A mindset of caring for the needs of others, including clients and colleagues
A sincere commitment to face challenges directly
Individuals and organizations that continue to grow
A mindset of sincerely confronting one’s own limitations and striving for continuous improvement
Self-awareness
An organization that creates outstanding value
A mindset of sincerely reflecting on and being fully aware of one’s own mission and role
A curated selection of videos by “Kuma-san,” an internationally experienced CPA, focused on business growth. The content is updated regularly, so please check back often. (Sorry, currently available in Japan only.)
A YouTube channel hosted by “Kuma-san,” a CPA with extensive international experience, focusing on the business growth of small and medium-sized enterprises. The channel clearly explains practical ways of thinking and concrete approaches to common challenges faced by business owners, based on real-world experience. Beyond accounting and taxation, it offers valuable insights into management decision-making and business growth, making it a useful resource for executives and business leaders seeking actionable guidance.
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