What Accountax does

Accountax (株式会社アカウンタックス) is a Tokyo-based accounting outsourcing firm founded in April 2004 by CPA and tax accountant Yamaguchi Masamichi (山口真導). The company delivers subscription-based accounting services to owner-managers of Japanese SMEs and growth-stage ventures, with a reported client base exceeding 200 companies ranging from 5-employee startups to enterprises with annual revenue up to ¥100 billion.

Its core product is Rental Accounting (レンタル経理), a fee-based outsourced bookkeeping service launched in 2017, complemented by a portfolio of digital tools including the MIETA SaaS accounting visualization platform (beta launched January 2008), the Kigyo Navi and Bizubu owned-media properties for entrepreneurs and owner-managers, and the newer a-Tax Matching (launched August 2023) and a-Tax Advisor's (launched August 2024) services that connect clients with external tax professionals. The firm operates behind a proprietary data linkage scheme and standardized internal accounting framework, with Privacy Mark certification held continuously since 2009.

The business runs on a tiered monthly subscription pricing model — Light Plan (¥50,000–¥200,000), Standard Plan (¥100,000 base plus per-employee fee), and Super Plan (¥150,000 base plus per-employee fee) — supplemented by Second Opinion consulting at ¥10,000/month and recurring tax-saving seminars priced at ¥4,000–¥15,000 per session. With approximately 8 employees and ¥10 million in registered capital, Accountax delivers services nationwide from a single office in Chiyoda-ku, Tokyo, operating a high-leverage delivery model in which each staff member reportedly handles 10+ client engagements.

Name

Accountax

Legal name

株式会社アカウンタックス

Website

https://accountax.co.jp

Company type

Private

Founded year

2004

Operating status

Operating

Headcount range

1–10 employees

Short description

Accountax is a Tokyo-based accounting outsourcing firm that delivers subscription bookkeeping, tax advisory, and SaaS visualization tools to owner-managers of Japanese SMEs and growth-stage ventures, serving 200+ companies across diverse industries.

Ownership category

akta.pro rank

Product category

Accounting Outsourcing Services

NAICS

Offices of Certified Public Accountants (541211), Accounting, Tax Preparation, Bookkeeping, and Payroll Services (5412)

SIC

Finance Services (6199)

akta.pro primary industry

Accounts Receivable (Invoicing, Cash Application, Deductions) (BPAAAGAB)

akta.pro secondary industries

Fixed Assets Accounting (Capitalization, Depreciation, Asset Register) (BPAAAGAF), Expense Management & Reimbursements Administration (BPACAIAH), Budgeting & Cash-Flow Management (FSAGADAA)

Keywords

• Accounting outsourcing
• Cloud bookkeeping services
• Tax advisory services
• SME financial management
• Payroll processing services

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel

Revenue model

1. レンタル経理 (Rental Accounting / Accounting Outsourcing): Monthly recurring outsourcing fees for full accounting services including bookkeeping, payment processing, accounts receivable management, payroll, and financial closing. Pricing based on number of employees with tiered plans (Light, Standard, Super).
2. セカンドオピニオンサービス (Second Opinion Consulting): Monthly consulting fee for tax, accounting, and corporate law advice to non-client owner-managers seeking alternative expert opinions.
3. 节税セミナー (Tax-Saving Seminars): Fee-based seminars for owner-managers on tax reduction strategies. Online and in-person formats; fee ranges from ¥4,000–¥15,000 per session.
4. a-Tax顧問's (Tax Advisor Matching Platform): Matching platform connecting tax advisor clients with additional professional support services.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

Accountax provides outsourced accounting services — branded as "Rental Accounting" (レンタル経理) — to owner-managers of SMEs and ventures, handling bookkeeping, accounts receivable and payable management, payroll, bank payment registrations, monthly financial closing, and tax-saving advisory. Delivery combines regulatory know-how, internet banking and cloud-accounting tools, and dedicated staff to act as the client's "external accounting department," supported by additional services such as tax-saving seminars, second-opinion consulting, a tax-advisor matching platform (a-Tax), and the proprietary MIETA SaaS visualization tool.

Product overview

Accountax operates as a multi-service accounting and financial advisory firm offering both software and professional services. Its primary software product is MIETA, a cloud-based accounting data aggregation platform that consolidates financial data from multiple accounting and payroll software packages. The product portfolio is complemented by a range of professional service brands including rental accounting outsourcing, tax seminars for business owners (社長tax seminar), a business establishment guidance service (起業ナビ), a tax professional referral service (a-Tax Matching), an advisor support platform (a-Tax Commons), and independent second-opinion consulting. The firm also operates two professional entities — 山口公認会計士事務所 (Yamaguchi Certified Public Accountant Office) and 税理士法人アカウンタックス (Tax Accountant Corporation Accountax) — providing audit and tax filing services.

Differentiator

Problem solved

Functional benefit

Brands

• レンタル経理: クラウドツールを活用した経理代行サービス (Cloud-based accounting outsourcing service)
• a-Tax顧問's
• a-Tax税理士マッチング
• 起業ナビ
• ビズ部
• MIETA

Products and services

• Rental Accounting (レンタル経理) Subscription-based outsourced accounting service for owner-managers of SMEs; combines regulatory know-how, internet banking and cloud-accounting tools, and dedicated staff to act as the client's external accounting department. Covers bookkeeping, accounts receivable and payable management, payroll, bank payment registrations, and monthly financial closing. Offered in three tiers (Light, Standard, Super) priced by employee count, starting at ¥50,000/month.
• Tax-Saving Seminars for Owner-Managers (社長の手取りをトコトン増やす節税セミナー) Paid seminars teaching owner-managers how to maximize personal take-home pay through tax-reduction strategies. Delivered in both online and in-person formats at ¥4,000–¥15,000 per session, scheduled 15:00–17:00. Functions as the primary lead-generation event for the firm's outsourcing services.
• Second Opinion Consulting Service Subscription advisory service at ¥10,000/month (tax included) providing phone-based independent second-opinion reviews on corporate law, accounting standards, and tax law. Targeted at non-client owner-managers; original launch capped at the first 100 clients at the launch price.
• a-Tax Advisor's Service (a-Tax顧問's) Service supporting tax advisors and accounting professionals in delivering additional professional support services to their existing clients, extending the firm's reach through partner tax advisors.
• a-Tax Tax Accountant Matching (a-Tax税理士マッチング) Matching platform that connects owner-managers and SMEs with tax accountants and additional professional support services to extend advisor coverage.
• MIETA (ミエタ) — Business Visualization SaaS Proprietary cloud-based SaaS tool that aggregates financial data from multiple Japanese accounting and payroll software packages (Yayoi Kaikei, Yayoi Hanbai, Yayoi Kyuyo, MJS, PCA, JDL, etc.) into a unified business-visualization dashboard, enabling real-time financial reporting and monitoring without modifying clients' existing IT systems.
• Kigyo Navi (起業ナビ) Owned media platform providing company formation, financing, and accounting guidance content for entrepreneurs and early-stage companies; serves as a top-of-funnel content-marketing channel generating leads for Accountax's professional services.
• Bizubu (ビズ部) Owned media platform targeting owner-managers with tax-saving and financial-management content; functions as a top-of-funnel brand-building and lead-generation channel and has produced published books on tax strategy for entrepreneurs.

Quantifiable outcome

• Monthly close as fast as 3 business days
• +3 more outcomes

Named customers2 records

Segments1 record

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration14 records

Feature3 records

Scale indicators5 records

Recent moves8 records

Expansion highlights5 records

Direct peers

• freee K.K. Leading cloud accounting SaaS for Japanese SMEs and startups; competes head-on with Accountax's MIETA platform and increasingly bundles outsourced bookkeeping services that compete with Accountax's Rental Accounting offering.
• Money Forward, Inc. Cloud accounting and expense management platform serving Japanese SMEs; offers MF Cloud Accounting, MF Cloud Advisors (human advisory), and bank aggregation that overlaps directly with Accountax's outsourcing and MIETA integration capabilities.
• Startline Co., Ltd. Tokyo-based back-office BPO provider serving SMEs and venture companies with bookkeeping, payroll, and tax filing services; directly comparable service portfolio and customer segment to Accountax's Rental Accounting offering.
• NPC Inc. (エヌ・ピー・シー): Japanese provider of outsourced accounting, payroll, and back-office BPO services to SMEs and owner-managed companies; directly comparable service model, target customer, and pricing structure to Accountax's Rental Accounting.
• Mirai Partners / Mirai Co., Ltd. Japanese accounting outsourcing and tax advisory firm serving SME and mid-market clients; competes with Accountax in the bundled bookkeeping-plus-tax-advisory service market for owner-managers.

Broad incumbents

• OBC (Osaka Business Computer Co., Ltd.): Established Japanese accounting/ERP software vendor serving mid-market and SME segments; competes with Accountax on outsourced bookkeeping workflows for accounting firms and direct SME clients.
• PCA Corporation: Mid-tier Japanese accounting software vendor (PCA Kaikei, PCA Hyoca) with established SME client base; Accountax's MIETA integrates with PCA products, positioning PCA as both partner and competitor for SME accounting services.
• Yayoi Co., Ltd. (弥生株式会社): Dominant Japanese accounting software vendor (Yayoi Kaikei) with deep SME penetration; Accountax's MIETA integrates directly with Yayoi products. Yayoi is a key technology partner/competitor in Japanese SMB accounting automation.
• TKC Corporation: Major Japanese accounting/consulting firm serving 70,000+ CPA and tax accountant offices; provides both practice management software and outsourced accounting services that compete with Accountax across multiple service tiers.

Others

• Shikin Chotatsu BANK Co., Ltd. (資金調達BANK): Financing marketplace for SMEs; Accountax has a business/capital partnership with this firm to provide financing advisory, representing an adjacent ecosystem partner rather than direct competitor.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCwF3mWkpW7E_8RvMlzB7Xkg

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries2 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 Accountax