Tax Corporation Tsubame

What Tax Corporation Tsubame does

Tax Corporation Tsubame (税理士法人つばめ) is a Tokyo-based tax accounting partnership founded in March 2017 by Kawamura Hiroyasu, a certified public accountant and licensed tax accountant formerly of Shin Nihon Auditing. The firm operates from a single office in Yoyogi, Shibuya-ku (relocated there in November 2024) and serves three distinct customer segments from that base: Japanese NPO corporations, small and mid-sized businesses, and individuals/families requiring inheritance tax filing. It is staffed by three employee-partners with complementary backgrounds in audit, banking consulting, and specialized inheritance tax work; the inheritance specialist alone has handled over 500 cases.

The firm's core technology is a freee-centric cloud accounting ecosystem. It has developed two proprietary SaaS applications that extend freee's API: Nport (released January 2019), which generates NPO-formatted financial statements, donation registries, and revenue-business tax calculations from freee data, priced at ¥10,000 per corporation per year; and kansapo (beta December 2019, official release November 2020), a cloud-based management analysis and audit support assistant that won the freee App Award 2020 Grand Prize. Both products have received formal recognition — Nport took both the department award and the grand prize at the 4th Social Issues ICT Service Awards in 2020. The firm holds freee Certified Consultant/Advisor status and integrates with Chatwork/Slack for client communication and Stripe for Nport billing.

Revenue is generated through three streams: recurring monthly tax advisory subscriptions for businesses (scaled to client size); one-time inheritance tax filing fees published on a tiered estate-value basis ranging from ¥330,000 to ¥1.32M-plus; and the annual Nport SaaS subscription. Customer acquisition is content-driven (SEO-optimized blog columns on inheritance and NPO topics), free-consultation-led for advisory services, and community-led for Nport. The firm maintains referral partnerships with multiple NPO support organizations (Service Grant, Japan Fundraising Association, Seeds, NPO Support Center) and co-markets with freee through seminars and case studies. Revenue, headcount beyond the three partners, and any external funding are not publicly disclosed.

Name

Tax Corporation Tsubame

Legal name

税理士法人つばめ

Website

https://tsubametax.jp

Company type

Private

Founded year

2017

Operating status

Operating

Short description

Tax Corporation Tsubame is a Tokyo-based tax accounting partnership serving Japanese NPO corporations, SMBs, and inheritance clients, operating two freee-integrated SaaS products (Nport and kansapo) alongside traditional tax advisory and inheritance filing services.

Ownership category

akta.pro rank

Product category

Tax Advisory & Accounting Services

NAICS

Accounting, Tax Preparation, Bookkeeping, and Payroll Services (5412)

SIC

Finance Services (6199)

akta.pro primary industry

Tax Return Filing, Processing & Assessment (BPAIADAC)

akta.pro secondary industry

Tax Planning & Personal Tax Optimization Tools (FSAGADAJ)

Keywords

• Tax advisory services
• Inheritance tax filing
• NPO accounting support
• Cloud accounting integration
• Audit response assistance

Headquarters

HQ city

Shibuya

HQ country

Japan

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Tax Advisory Services (税務顧問): Ongoing tax advisory services for businesses, with fees adjusted to business scale. Utilizes cloud accounting software (freee) and communication tools for daily support. Provides internal control compliance support.
2. Inheritance Tax Filing Services (相続・遺産申告): One-time service fees for inheritance tax filing and related procedures. Fees are based on the assessed estate value. Additional fees apply for land evaluation, stock evaluation, co-heirs, urgent deadlines, and written attachment system (tax audit defense). The firm claims industry-lowest pricing structure.
3. Nport Subscription: Annual subscription model for the Nport NPO accounting application. Priced at 10,000 JPY per corporation per year (excluding tax). One subscription covers one fiscal year. Multiple users and experts can be invited without per-seat restrictions.

Pricing tiers

Go-to-market motion3 records

Distribution channels2 records

Marketing channels6 records

Core offering

Tax Corporation Tsubame is a Japanese tax accounting partnership providing ongoing tax advisory and accounting services for businesses, specialized inheritance tax filing and succession planning for individuals and families, and dedicated accounting support for NPO corporations. The firm develops two proprietary SaaS products—Nport for NPO financial statement generation and kansapo for cloud-based audit support—both integrated with the freee cloud accounting platform, enabling remote-first delivery of professional services via Chatwork and Slack.

Product overview

Tax Corporation Tsubame offers a suite of tax, accounting, and advisory services centered on two proprietary SaaS products — Nport and kansapo — both integrated with cloud accounting platform freee. Nport is an accounting support application designed specifically for NPO corporations, enabling them to generate required financial statements by pulling data from freee. kansapo is a cloud-based audit support assistant that enhances audit efficiency when used alongside freee. Beyond these products, the firm provides fee-based tax advisory services (covering both general corporate tax and inheritance/succession tax), delivered via remote communication tools rather than in-person visits.

Differentiator

Problem solved

Functional benefit

Brands

• Nport: NPO法人のための会計支援アプリ。クラウド会計ソフトfreeeと組み合わせて使い、NPO法人用の財務諸表等を作成できる。
• kansapo

Products and services

• Nport A SaaS application for NPO corporations that integrates with cloud accounting software freee to generate required financial statements (活動計算書 activity statements, 貸借対照表 balance sheets, 注記 notes, 財産目録 property catalogs), donation registries, and tax calculation documents for revenue-generating activities. Features include input validation, department registration checks, and automatic donor list generation. Used by NPO corporations and NPO support partners to streamline regulatory compliance.
• kansapo A cloud-based management analysis and audit support assistant that integrates with freee to improve audit efficiency and enable remote audit support. Designed for accounting firms and audit teams to streamline management analysis and audit workflows through cloud-native tools.
• NPO Support Services (NPO法人向けサービス) Accounting and operational support services specifically designed for NPO corporations, using freee and Nport to enable organizations to focus on their core social mission. Covers financial statement preparation, donation management, grant accounting, revenue business tax calculation, audit preparation, and freee implementation and optimization. Targets NPO organizations with limited accounting personnel and budgets.
• Inheritance Tax Services (相続税・事業承継) Specialized inheritance tax filing and planning services handled by full-time inheritance tax specialists with 500+ cases of experience. Covers pre-succession planning (inheritance consultation, gift tax strategy, testament preparation), post-succession procedures (inheritance tax filing, real estate inheritance, stock valuation), business succession planning, and tax audit defense support via the written attachment system. Targets individuals and families in Tokyo, Kanagawa, Saitama, and Chiba.
• Tax Advisory Services (税務顧問) Ongoing tax advisory and accounting services for businesses of all sizes, including freee plan selection support (personal Starter/Standard/Premium; business Minimum/Basic/Professional/Enterprise), workflow construction, monthly closing, internal control compliance, and daily support via Chatwork and Slack communication tools. Service is tailored to business scale, delivered remotely as the default with in-person visits by exception.

Quantifiable outcome

• Inheritance tax cases: 500+ total cases handled by specialist tax accountant
• +3 more outcomes

Named customers2 records

Segments3 records

Ideal customer profiles3 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

Feature2 records

Partnerships

Six partnerships are on record, tiered core and minor.

• freee株式会社 (freee K.K.)coreTechnology or Integration · 1 January 2019Core technology partnership where freee serves as the accounting platform. The firm develops proprietary applications (Nport, kansapo) that integrate with freee's API. The firm is a freee certified partner and has been featured in freee's case studies and co-hosts seminars. They have co-developed audit efficiency tools and refer clients for freee implementation. freee accounts are required for Nport users.
• 認定NPO法人サービスグラント (Service Grant)minorGTM or Marketing PartnerService Grant provides pro-bono support to NPOs. As a partner organization, they refer NPOs to Nport and the firm's accounting services, serving as a channel partner for the NPO segment.
• 日本ファンドレイジング協会 (Japan Fundraising Association / jfra)minorGTM or Marketing PartnerThe Japan Fundraising Association supports NPO fundraising. They are a partner in the Nport ecosystem, referring NPOs seeking fundraising and accounting support to the firm's services.
• 認定NPOビー・市民活動を支える制度をつくる会 (Seeds / NPO Web)minorGTM or Marketing PartnerSeeds supports NPOs in obtaining certified NPO status. They partner with the firm for accounting support services needed by NPOs pursuing or maintaining certified status.
• NPOサポートセンター (NPO Support Center)minorGTM or Marketing PartnerThe NPO Support Center provides freee introduction and utilization support for NPOs. They co-host seminars with the firm on NPO accounting using freee and Nport, and serve as a referral channel for the firm's NPO services.
• KPMG / あずさ監査法人 (KPMG/Azuska Audit Corporation)minorStrategic or Co-development PartnerThe firm co-presented at KPMG/Azuska Audit Corporation's 46th FinTech Seminar on 'DX of Business Management in Financial Institutions' in August 2022, indicating a strategic working relationship around audit technology and cloud accounting.

Scale indicators4 records

Recent moves13 records

Expansion highlights5 records

Direct peers

• TOMA税理士法人 (TOMA Tax Corporation): Mid-sized Japanese tax accounting corporation offering corporate tax, inheritance, and management advisory services to SMBs. Directly comparable as a multi-partner Japanese 税理士法人 serving similar client segments with diversified service lines.
• みらいコンサルティング (Mirai Consulting): Japanese tax/accounting and management consulting firm serving SMB and mid-market clients with advisory, succession, and corporate tax services. Comparable as a similarly-sized, multi-service Japanese tax/accounting practice with advisory focus.

Broad incumbents

• 弥生株式会社 (Yayoi Co., Ltd.): Japan's largest accounting software provider for SMBs, with growing cloud and advisory offerings. Comparable as a cloud accounting software incumbent whose ecosystem competes with and complements freee/Tsubame's NPO SaaS approach.
• 辻・本郷税理士法人 (Tsuji-Hongo Tax Corporation): One of the largest Japanese tax accounting firms with full national coverage and corporate, inheritance, and international tax services. Relevant as a scaled incumbent benchmark for service breadth and pricing in the same Japanese tax market.
• TKC: Major Japanese provider of accounting software, tax filing systems, and consulting services to tax accountants and SMBs. Comparable as a vertically integrated tax-tech incumbent competing in adjacent cloud accounting and SMB advisory segments.
• 朝日税理士法人 (Asahi Tax Corporation): Large Japanese tax accounting firm offering corporate tax, inheritance, and consulting services. Comparable as an established multi-partner Japanese 税理士法人 competing for similar SMB and individual clients.

Others

• freee株式会社 (freee K.K.): Core platform partner and operator of Japan's leading cloud accounting software. Included as an ecosystem dependency and adjacent player rather than direct competitor, given that Tsubame's SaaS products are built on freee.

Emerging players

• 株式会社マネーフォワード (Money Forward, Inc.): Japanese cloud accounting and HR/payroll SaaS company competing directly with freee. Comparable as a tech-enabled cloud accounting platform that could compete with Nport for NPO and SMB financial automation use cases.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/kawamura_cpa
• Facebookfacebook.com/nport.jp

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 Tax Corporation Tsubame