税理士法人Suinas

What 税理士法人Suinas does

Suinas Professional Group (税理士法人Suinas) is a privately held Japanese professional services firm founded in 2015 by Kohei Wataguchi (渡口 宏平), who previously spent five years at KPMG and served as General Manager of an international accounting firm in Myanmar. The firm operates as a multi-disciplinary alliance of certified public accountants, licensed tax accountants (税理士), judicial scriveners (司法書士), and social insurance labor consultants (社会保険労務士), delivering bundled tax, accounting, audit, corporate secretarial, inheritance, due diligence, and M&A advisory services to Japanese individuals, SMEs, and corporate clients. Its core business model is fee-for-service professional engagements (per engagement or retainer) with pricing not publicly disclosed and business sourced through direct inquiry, in-person consultations across four offices, and an active bilingual content-marketing program.

The firm differentiates itself through a multi-credentialed partner team whose backgrounds include KPMG, Deloitte, and Myanmar international advisory, plus a dedicated Chinese-language service team (with WeChat, Chinese website, and Chinese column content) targeting Chinese-speaking residents and Chinese-owned enterprises — including cross-border e-commerce sellers — operating in Japan. Service scope spans company incorporation, tax return filing, bookkeeping outsourcing, payroll, social insurance, inheritance tax, statutory and voluntary audit, due diligence with stock valuation (net asset, DCF, comparable transaction methods), consolidated reporting, and overseas expansion advisory. The firm also operates a vertical niche in agricultural tax and 農地所有適格法人 support via its Sayo office.

Suinas operates four offices — Tokyo (Shibuya headquarters), Kobe, Sayo (Hyogo), and Saitama (Kawagoe) — serving the Kanto and Kansai regions of Japan. The firm is independent, with no parent company, no external institutional investment, and no disclosed funding rounds; ownership is held among the founding partners (Wataguchi, Shimomura Kazuya, and Taniguchi Yuichi) and subsequent partner joiners. Distribution is exclusively direct: phone, email, in-person office consultation, and inbound web inquiries — there is no online product, marketplace, or reseller channel.

Name

税理士法人Suinas

Legal name

税理士法人Suinas

Website

https://suinas.com

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

1–10 employees

Short description

Suinas Professional Group is a privately held Japanese professional services firm founded in 2015 that operates four offices (Tokyo, Kobe, Sayo, Saitama) and delivers bundled tax, accounting, audit, due diligence, and corporate advisory services through a multi-disciplinary team of CPAs, tax accountants, judicial scriveners, and social insurance labor consultants, with a dedicated Chinese-language service line for Chinese-speaking clients in Japan.

Ownership category

akta.pro rank

Product category

Tax and Accounting Professional Services

NAICS

Offices of Certified Public Accountants (541211), Accounting, Tax Preparation, Bookkeeping, and Payroll Services (54121)

akta.pro primary industry

Trust & Estate Tax Planning & Compliance (FSAEAKAE)

akta.pro secondary industries

Family Office Trust & Fiduciary Services (FSAEAKAF), Disability & Leave Administration (STD/LTD/FMLA/Paid Leave) (HLAEALAM)

Keywords

• Tax accounting services
• Audit and assurance
• Inheritance tax planning
• Company incorporation services
• Bookkeeping and payroll

Headquarters

HQ city

Tokyo (Shibuya)

HQ country

Japan

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Infrastructure

Revenue model

1. Professional Services (Tax, Accounting, Audit, Advisory): Suinas generates revenue through professional service fees for company incorporation, tax filing, bookkeeping/payroll, inheritance tax, audit, due diligence, overseas expansion advisory, and corporate secretarial services. Fees are charged on a per-engagement or retainer basis depending on the service scope and client size.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Suinas Professional Group is a multi-disciplinary Japanese professional services firm that delivers company incorporation and sole proprietorship registration, tax return filing, bookkeeping/payroll/social insurance outsourcing, inheritance tax planning, statutory and voluntary audits, due diligence and stock valuation, and overseas expansion advisory. It also operates a dedicated Chinese-language service line for Chinese-speaking residents, Chinese companies, and e-commerce sellers operating in Japan.

Product overview

Suinas Professional Group is a professional services firm consisting of certified public accountants, tax accountants (税理士), judicial scriveners (、司法書士), and labor and social insurance attorneys (社会保险労務士). The firm offers integrated professional services including company establishment, tax filing and advisory, bookkeeping and payroll processing, inheritance tax, auditing, due diligence, and overseas expansion advisory. Services are provided across four offices in Tokyo (渋谷), Kobe (神戸), Sayo (佐用), and Saitama (埼玉). The firm also provides dedicated Chinese-language services for Chinese companies and e-commerce sellers operating in Japan.

Differentiator

Problem solved

Functional benefit

Products and services

• Company Incorporation and Sole Proprietorship Registration (会社設立・個人事業主開業)

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• EY ShinNihon LLC: EY's Japanese audit and advisory affiliate covering audit, tax, transaction advisory, and consulting. Overlaps with Suinas in audit, due diligence, and inheritance/cross-border tax planning, particularly for clients with international needs.
• Deloitte Touche Tohmatsu LLC (Japan): Deloitte's Japanese member firm providing full-service audit, tax, consulting, and financial advisory. Competes for large M&A due diligence, international tax, and cross-border advisory mandates that overlap with Suinas's overseas expansion advisory offering.
• KPMG AZSA LLC: KPMG's Japanese audit and advisory affiliate — comparable for premium audit, tax, and M&A advisory work. Competes for the same high-value due diligence, IPO support, and overseas expansion engagements that Suinas targets, but at significantly greater scale and brand recognition.

Direct peers

• MJS (Miroku Information Service Co., Ltd.): Japanese accounting software vendor and professional services group with affiliated CPA and tax accountant networks across Japan. Mirrors Suinas's model of combining software/tools with multi-disciplinary professional services for the SMB and mid-market segment.
• TKC Corporation: Japan's largest provider of tax and accounting software combined with affiliated CPA/tax accountant professional services, serving SMBs nationwide. TKC is the most structurally comparable firm to Suinas given its dual software-and-professional-services model and focus on Japanese small and medium businesses.
• Yayoi Co., Ltd. Major Japanese accounting software and back-office services provider, dominant in tax filing and bookkeeping software for small businesses and sole proprietors — the same primary client base Suinas serves. A direct competitive overlap in tax filing and bookkeeping services.
• BDO Japan: Japan member firm of BDO Global, providing audit, tax, and advisory services to mid-market and SME clients. Comparable multi-disciplinary service offering and client base, though operating at greater scale and as part of a global network.
• AGS Consulting: Mid-sized Japanese tax, accounting, and management consulting firm serving corporate clients. Comparable in professional services breadth (tax, advisory, M&A support) and target market, with similar Big-Four-trained partner profiles.

Emerging players

• Money Forward, Inc. Japanese cloud accounting, HR, and fintech platform serving SMBs and sole proprietors with automated bookkeeping, tax filing, and payroll. Represents a tech-enabled threat to traditional tax accountant firms, including the core bookkeeping and tax filing services Suinas provides.
• freee K.K. Japan's leading cloud accounting and HR platform, automating bookkeeping, tax filing, and payroll for SMBs. An emerging technology-enabled competitor targeting the same small-business and sole-proprietor clients that form Suinas's individual client base.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/%E7%A8%8E%E7%90%86%E5%A3%AB%E6%B3%95%E4%BA%BAsuinas

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about 税理士法人Suinas