What ZEI PARTNERS does

ZEI PARTNERS (legal name: 税理士法人パートナーズ, Zeirishi Hojin Partners) is a privately held Japanese tax accountant corporation founded in 2003 and headquartered in Okayama Prefecture. The firm specializes in inheritance and gift tax advisory, estate planning, and business succession services, serving individual high-net-worth clients and small-to-medium enterprises (SMEs) across the Chugoku, Shikoku, Kansai (Osaka), and Okinawa regions of Japan. The firm is positioned as a dedicated inheritance tax specialist in a market that expanded materially after the 2015 Japanese tax reform broadened the population subject to inheritance tax, with the firm claiming over 2,000 inheritance-related cases handled annually.

The firm operates through a 10-office regional network and delivers services via a structured product portfolio. Individual-facing offerings include five inheritance-focused plans covering pre-inheritance preparation, smooth inheritance processing, inheritance tax filing, estate organization, and filing diagnosis, plus an end-of-life documentation service. Corporate-facing offerings include business improvement, cost reduction, financial improvement, business succession, and startup support plans. Revenue is generated through professional service fees, combining one-time project fees for tax filings and discrete engagements with recurring advisory retainers for ongoing corporate relationships. Client acquisition follows a sales-led, event-driven go-to-market: free initial consultations (both in-person and online) and a recurring seminar series, including co-hosted events with legal partners such as Eida Legal Office (司法書士法人永田事務所), serve as the primary top-of-funnel lead generation channels. The firm holds a Certified Management Innovation Support Organization designation from the Japanese government (ID: 108633000502).

The firm's underlying platform is human expertise in Japanese tax law and succession planning; no proprietary software, technology products, AI capabilities, or technology partnerships are disclosed. The firm is owner-operated with no external institutional investment or PE backing evidenced in available data, and pricing for specific engagements is quote-based rather than publicly disclosed.

Name

ZEI PARTNERS

Legal name

税理士法人パートナーズ

Website

https://zei-partners.com

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

51–100 employees

Short description

ZEI PARTNERS (税理士法人パートナーズ) is a Japanese tax accountant corporation specializing in inheritance and gift tax advisory, estate planning, and business succession services for high-net-worth individuals and SMEs across 10 offices in Chugoku, Shikoku, Kansai, and Okinawa.

Ownership category

akta.pro rank

Product category

Tax Advisory and Inheritance Planning Services

NAICS

Portfolio Management and Investment Advice (523940), Trusts, Estates, and Agency Accounts (525920), Trust, Fiduciary, and Custody Activities (523991)

SIC

Investment Advice (6282)

akta.pro primary industry

Tax-Aware Retirement & Estate Coordination (FSAEABAJ)

akta.pro secondary industries

Family Wealth & Multi-Generational Planning RIAs (HNW/UHNW-lite) (FSAAACAH), Tax-Aware Investment Planning (FSAEAAAE)

Keywords

• Tax accountant services
• Inheritance tax filing
• Business succession planning
• Estate planning advisory
• Corporate tax consulting

Headquarters

HQ city

Okayama

HQ country

Japan

HQ region

Asia

Offices10 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Tax Advisory and Filing Services: Professional tax accounting services including inheritance tax filing, gift tax planning, and ongoing tax advisory for both individuals and corporations. Revenue is generated through service fees for consultation, planning, and tax filing documentation.
2. Estate/Inheritance Planning Services: Pre-inheritance planning services including trust arrangements, will preparation support, and asset succession planning. One-time project-based fees combined with ongoing advisory retainer arrangements.
3. Corporate Services: Business improvement, cost reduction, financial improvement, and business succession planning services for corporate clients. Recurring advisory fees with project-based implementation charges.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

ZEI PARTNERS is a Japanese tax accountant corporation providing inheritance tax consulting, tax and accounting advisory, and business succession and startup support services. The firm delivers its services through a structured portfolio of individual-focused inheritance plans (pre-inheritance preparation, smooth inheritance, tax filing, estate organization, and filing diagnosis) and corporate-focused plans (business improvement, cost reduction, financial improvement, business succession, and startup support), delivered via 10 regional offices and online consultations.

Product overview

税理士法人パートナーズ is a unified tax and inheritance advisory firm offering a comprehensive suite of services for both individual and business clients. The core portfolio centers on inheritance planning (相続) with five specialized plans: 相続開始前の安心プラン (pre-inheritance preparation), 相続の円滑プラン (smooth inheritance process), 房产税申告プラン (tax filing), 遺産整理プラン (estate organization), and 房产税申告書診断プラン (filing diagnosis). For corporate clients, the firm provides 事務改善プラン (business improvement), 経費削減プラン (cost reduction), 財務改善プラン (financial improvement), 事業継承 (business succession), and 起業・新規開業支援 (startup support). Additional offerings include エンディングノート (end-of-life documentation) and free initial consultations (対面・オンライン相談). The multi-office structure spanning Chugoku-Shikoku, Osaka, and Okinawa regions enables coordinated service delivery across prefectures.

Differentiator

Problem solved

Functional benefit

Products and services

• Pre-Inheritance Preparation Plan (相続開始前の安心プラン)
• Smooth Inheritance Plan (相続の円滑プラン) Plan designed to facilitate the inheritance process, reducing complications and conflicts among heirs for individual and family clients.
• Inheritance Tax Filing Plan (相続税申告プラン) Comprehensive tax return preparation service for inheritance-related tax obligations, targeting individual heirs and families handling inheritance tax filings.
• Estate Organization Plan (遺産整理プラン) Service assisting individuals and families with organizing and managing inherited assets and properties following an inheritance event.
• Inheritance Tax Filing Diagnosis Plan (相続税申告書診断プラン) Service that reviews and evaluates existing inheritance tax filings for accuracy and optimization opportunities, targeting individuals who have already filed or are uncertain about prior filings.
• Business Improvement Plan (事務改善プラン) Operational efficiency and workflow optimization service for corporations and sole proprietors, targeting business owners seeking to streamline administrative operations.
• Cost Reduction Plan (経費削減プラン) Expense reduction and financial efficiency service for businesses, identifying areas to reduce costs and improve financial performance, targeting SME owners.
• Financial Improvement Plan (財務改善プラン) Service helping businesses strengthen financial health and stability through analysis and advisory, targeting SME owners and corporate management.
• Business Succession Services (事業承継) Service helping companies plan and execute smooth transitions of ownership and management, targeting SME owner-operators approaching business succession events.
• Startup and New Business Support (起業・新規開業支援) End-to-end support service for entrepreneurs and new business ventures from planning to launch, targeting founders and aspiring business owners.
• End-of-Life Notebook Service (エンディングノート) Service helping individuals document their wishes and organize important information for future reference, supporting inheritance and estate preparation.

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• Eida Legal Office (司法書士法人 永田事務所)coreStrategic or Co-development PartnerCo-hosts inheritance consultation seminars and events with Eida Legal Office. Provides comprehensive one-stop services combining tax and legal expertise for inheritance procedures.

Scale indicators4 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Tsuji & Hongo Tax Corporation (辻・本郷 税理士法人): One of the largest Japanese tax firms with national coverage and a strong inheritance/succession practice. Represents the scaled incumbent benchmark that ZEI PARTNERS competes against in higher-value engagements.
• PwC Tax Corporation (PwC税理士法人): Japan practice of a global Big 4 tax firm, with strong inheritance and business succession capabilities for large corporates and HNW clients. Represents a scaled, well-capitalised competitor in adjacent segments.
• KPMG Tax Corporation (KPMG税理士法人): Japan practice of a global Big 4 tax firm, providing inheritance, succession, and international tax services to large corporates and HNW individuals. Broad incumbent competing for the upper end of ZEI PARTNERS' addressable market.
• EY Tax Corporation (EY税理士法人): Japan practice of a global Big 4 tax firm, offering inheritance, succession, and corporate tax services. Broad incumbent competing for higher-end mandates that ZEI PARTNERS' specialist team also targets.

Direct peers

• Taiyo Tax Corporation (太陽税理士法人): Mid-sized Japanese tax firm offering inheritance, business succession, and corporate tax services. Comparable in scale and service mix to ZEI PARTNERS, especially within the SME and individual segment.
• Aoyama Zaisan Network (青山財産ネットワーク): Japanese wealth and inheritance tax specialist combining tax accounting with real estate advisory. Highly comparable to ZEI PARTNERS in customer segment (HNW families) and service focus (estate and succession planning).
• Japan Creas Tax Corporation (日本クレアス税理士法人): Mid-sized Japanese tax and accounting firm with a dedicated 相続 and 事業承継 practice. Comparable in scale, multi-office model, and the mix of individual and SME clients that defines ZEI PARTNERS' book.
• Chester Tax Corporation (税理士法人チェスター): One of Japan's most prominent inheritance-tax specialist tax firms, with a multi-office footprint and a similarly dedicated focus on 相続 services. Closest direct comparable to ZEI PARTNERS given overlapping niche and customer base.
• Dream Support Tax Corporation (税理士法人ドリームサポート): Japanese tax firm specialised in inheritance tax and succession planning, serving individual clients. Direct peer given its dedicated 相続 focus and similar engagement model to ZEI PARTNERS.
• Axia Tax Corporation (アクシア税理士法人): Mid-sized Japanese tax and accounting firm offering inheritance, succession, and corporate advisory to individuals and SMEs. Comparable service breadth and target client mix to ZEI PARTNERS.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 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 ZEI PARTNERS