The Three Operating Structures
Foreign consultants, freelancers, and independent professionals in Japan face a structural decision before they earn their first yen: operate as an kojin jigyonushi, sole proprietor / individual business owner (個人事業主), or incorporate a GK, Godo Kaisha, Japan LLC equivalent (合同会社) or KK, Kabushiki Kaisha (株式会社). The choice affects your tax bill, your visa eligibility, your ability to open a bank account, and how Japanese clients and government agencies perceive you.
Sole Proprietor (個人事業主)
An 個人事業主 is not a separate legal entity. You and your business are one and the same. Setup is straightforward:
(a) File a kaigyo todoke, Business Commencement Notification (開業届) with your local zeimusho, Tax Office (税務署) within one month of starting business activity.
(b) Report all business income on your annual kakutei shinkoku (確定申告), filed between February 16 and March 15 of the following year.
(c) No registration with the Legal Affairs Bureau (法務局) is required. There is no company registry entry, no teikan, Articles of Incorporation (定款), and no minimum capital.
The simplicity is genuine. The trade-offs appear when income grows, visa requirements change, or clients start asking for a corporate counterparty.
GK (合同会社, Godo Kaisha)
A GK is Japan's equivalent of a limited liability company. Key characteristics:
(a) A separate legal entity with limited liability for its members (社員, shain). Your personal assets are generally protected from business debts beyond your capital contribution.
(b) Lower setup cost than a KK. No requirement to notarize the 定款 before a kosho-nin, Notary Public (公証人), which saves approximately JPY 50,000 in notarization fees.
(c) Less name recognition with Japanese banks and large corporate clients. Many major Japanese companies and financial institutions view a GK as a less established structure, and some lenders will not extend credit to a GK on the same terms they would offer a KK.
(d) Governed by kaisha-ho, Companies Act (会社法).
A GK is well suited for a foreign professional who wants a corporate entity for liability protection or tax efficiency, but whose clients are international or who are not seeking bank financing in Japan.
KK (株式会社, Kabushiki Kaisha)
A KK is the standard Japanese joint-stock company and carries the highest institutional credibility:
(a) A separate legal entity with shares. Ownership is represented by stock, making equity transfers and future investment rounds structurally cleaner than a GK.
(b) Higher setup cost. 定款 must be notarized by a 公証人, at approximately JPY 50,000. Registration tax (登録免許税) is a minimum of JPY 150,000.
(c) Maximum credibility with banks, government agencies, licensed activity regulators, and large Japanese corporate clients. For certain licensed activities (customs broker license, financial instruments dealer registration, and others), a KK is effectively required.
(d) Greater ongoing compliance burden: annual kessan kokoku (決算公告), kabunushi sokai (株主総会), and formal director resolutions for major decisions.
(e) Also governed by 会社法.
Tax: When Incorporation Saves Money
Tax efficiency is usually the most concrete reason a professional considers incorporating. The analysis turns on how much you earn and how you extract money from the entity.
The Sole Proprietor Tax Position
As an 個人事業主, all net business profit is added to your personal income and taxed under Income Tax Act (所得税法) at progressive rates. The top national income tax rate reaches 45% for income above JPY 40 million, with a practical top bracket of 33 to 40% for incomes in the JPY 10 to 30 million range. On top of that, jumin-zei (住民税) adds approximately 10% at the prefectural and municipal level. The combined marginal rate for a high-earning sole proprietor can exceed 55%.
One important offset: sole proprietors who elect aoiro shinkoku (青色申告) status receive meaningful benefits:
(a) A deduction of JPY 650,000 from net business income (reduced to JPY 550,000 for certain e-Tax filings and JPY 100,000 for the simplified version).
(b) The ability to pay a salary to a family member working in the business and deduct it as a business expense under the aoiro jigyou sensyusha kyuyo (青色事業専従者給与) rules.
(c) Loss carryforward for up to three years.
青色申告 status is obtained by filing a 青色申告承認申請書 with the Tax Office by March 15 of the applicable tax year (or within two months of commencing business for new 個人事業主).
The KK or GK Tax Position
A KK or GK is subject to hojin-zei (法人税) under hojin-zei-ho, Corporate Tax Act (法人税法). For small and medium enterprises, the effective corporate tax rate (combining national corporate tax, corporate inhabitant tax, and enterprise tax) generally runs between approximately 23% and 34% depending on capital size, income level, and prefecture.
The owner-director of a KK or GK takes a fixed annual yakuin hoshu, director's remuneration (役員報酬). This salary:
(a) Is deductible from the company's taxable income (reducing corporate tax).
(b) Is treated as employment income in the director's personal tax return, which qualifies for the kyuyo shotoku kojo (給与所得控除). This deduction scales with salary level, effectively reducing the personal tax base below the gross salary amount.
Profits left inside the company are taxed at the corporate rate. If later distributed as dividends, withholding tax at a combined rate of approximately 20.315% applies.
The Rough Threshold
A commonly cited reference point among Japanese tax practitioners: once annual net business income consistently exceeds approximately JPY 5 to 6 million, incorporation can begin to produce a lower combined tax burden than sole proprietorship. Below that level, the compliance costs and accounting fees associated with running a corporate entity typically outweigh the tax savings.
This is a directional benchmark, not a guarantee. The optimal salary level for the owner-director, the amount of profit retained in the company, the prefecture, and the specific corporate structure all affect the actual outcome. Consult a zeirishi, Licensed Tax Accountant (税理士) to model your specific situation before making the decision on tax grounds alone.
Consumption Tax (JCT)
Both 個人事業主 and KK or GK operators must register for shohizei, Consumption Tax / JCT (消費税) under Consumption Tax Act (消費税法) once taxable sales in the base period exceed JPY 10 million. A new business can also elect to register from the first year to issue qualified invoices (適格請求書 under the インボイス制度, invoice system). This threshold and obligation applies regardless of operating structure.
Visa: This May Decide the Question for You
For many foreign nationals in Japan, the visa situation is not a preference but a constraint. Get this right before worrying about tax optimization.
Work Visa Tied to an Employer
Foreign nationals on a standard work visa (技術・人文知識・国際業務 / engineer, specialist in humanities, international services) hold permission to work specifically for the employer named in their visa. Operating as an 個人事業主, or holding a director role in your own KK or GK, is generally outside the scope of that permission without separate authorization. Check with a qualified gyosei shoshi, Administrative Scrivener (行政書士) or immigration attorney before acting.
Business Manager Visa (経営管理ビザ)
The keiei-kanri, Business Manager (経営・管理) visa is the correct status for a foreign national who owns and manages their own business in Japan. To qualify:
(a) You must operate through a Japanese legal entity, either a KK or a GK. An 個人事業主 structure does not qualify for this visa category.
(b) The entity must have paid-in capital of at least JPY 5 million, or you must demonstrate employment of at least two full-time Japan-based staff (or a combination meeting equivalent criteria as assessed by immigration authorities).
(c) The entity must have a fixed, dedicated business office in Japan. A virtual office address will typically not satisfy this requirement at the time of initial visa application.
An 個人事業主 cannot hold a Business Manager visa. If you need this visa to be in Japan legally as a self-employed person, you need a KK or a GK.
Permanent Resident (永住者) and Spouse Visa Holders
Holders of eijusha, Permanent Resident (永住者) status and those on spouse or dependent visas tied to a Japanese national or permanent resident can operate freely as 個人事業主 without restrictions on business activity. These holders have the fullest flexibility to choose whichever structure makes the most sense on tax and commercial grounds.
Highly Skilled Professional (高度専門職) Visa
kodo senmonshoku, Highly Skilled Professional / HSP (高度専門職) visa holders may engage in business activities under certain conditions, but the permitted scope depends on which HSP category applies and the specific activities involved. Verify the specific permission conditions for your HSP visa before proceeding.
Credibility and Banking
How Japanese Clients Perceive You
Large Japanese corporations and government bodies frequently prefer to enter contracts with a KK over an individual or even a GK. Japanese procurement processes often require the counterparty to pass a credit review or vendor registration, and individuals and GKs may not pass the minimum threshold for these processes at major companies.
If your target clients are international companies or individuals, this concern is less acute. If you are targeting large Japanese enterprises or public-sector bodies, a KK is worth considering on commercial grounds alone.
Opening a Bank Account
The banking situation for fresh Japanese entities has become materially more difficult:
(a) Major banks (megabanks, regional banks, and net banks) now routinely decline corporate account applications from newly incorporated foreign-controlled entities. Approval rates across all bank types are significantly below 50% even under favorable conditions.
(b) Conditions that improve approval probability include: a Japan-resident representative director with a strong Japan banking history, paid-in capital that signals genuine business intent, a physical office address, and demonstrable Japan-based business activity.
By contrast, as an 個人事業主, you can maintain your personal bank account for business purposes or open a business account at a Japan bank in your personal name. This is procedurally much simpler. Transaction limits may be lower and the credibility signal weaker, but for solo operators in the early stages, it is functional.
Compliance Burden: Knowing What You Are Signing Up For
個人事業主
(a) Annual 確定申告 filing with the Tax Office, covering income tax and, once thresholds are met, JCT.
(b) JCT registration and quarterly or annual filing if taxable turnover exceeds the JPY 10 million base-period threshold.
(c) Social insurance via kokumin kenko hoken, National Health Insurance (国民健康保険) and kokumin nenkin, National Pension (国民年金). Premiums are paid entirely by you, with no employer contribution.
(d) No Legal Affairs Bureau filings. No annual reports. No 定款.
Total accounting cost for a well-organized 個人事業主 with 青色申告 status: a modest annual accounting fee or the time to use cloud accounting software.
KK or GK
(a) Annual corporate tax return (法人税申告書) filed within two months of fiscal year end.
(b) Annual Legal Affairs Bureau filing.
(c) For KK only: annual kessan kokoku (決算公告).
(d) Social insurance through kenko hoken, Health Insurance (健康保険) and kosei nenkin, Employees' Pension (厚生年金) for directors and employees.
(e) Annual accounting and tax preparation by a 税理士 costs typically JPY 300,000 to JPY 600,000 per year for a small single-director entity, depending on complexity.
(f) The 定款 teikan mokuteki (目的) clause must accurately reflect your actual business activities. Draft broadly at incorporation under 会社法. Amending the 定款 requires a special resolution and costs approximately JPY 30,000 in 登録免許税 plus judicial scrivener fees for a KK.
Decision Guide: Which Structure Fits Your Situation
Work through this in order.
Step 1: Visa Status Check. If you are in Japan on a work visa tied to an employer, resolve the immigration question first. If you need a Business Manager visa, you need a KK or GK. If you have PR or a spouse visa, proceed with full flexibility.
Step 2: Income Level.
(a) Below JPY 5 million net income per year: stay as 個人事業主 unless another factor drives incorporation. The compliance overhead of a corporate entity is unlikely to be offset by tax savings.
(b) JPY 5 to 10 million net income per year: this is the zone where incorporation starts to show a meaningful tax advantage. Model the actual numbers with a 税理士 before deciding.
(c) Above JPY 10 million net income per year: incorporation is generally worth the compliance cost on tax efficiency grounds alone.
Step 3: Client and Credibility Requirements. If your principal clients are large Japanese companies or public-sector entities, a KK is worth the additional setup cost. If your clients are international or primarily individuals, a GK or 個人事業主 may be sufficient.
Step 4: KK vs GK. Once you have decided to incorporate:
(a) Credibility: if you anticipate banking relationships, regulated activities, or large Japanese corporate clients, choose KK.
(b) Cost: GK setup costs are lower by approximately JPY 50,000 to JPY 100,000. Annual compliance costs are also modestly lower for GK.
(c) Future equity needs: if you intend to bring in outside investors or issue equity to employees, KK is structurally better suited.
Step 5: Liability Exposure. Both KK and GK provide limited liability. An 個人事業主 does not. If your work carries meaningful professional liability risk, limited liability is a reason to incorporate even before the tax threshold is reached.
How Aplash Can Help
KK and GK Incorporation. We handle 定款 drafting, Legal Affairs Bureau registration, and registered address arrangement. Correct 定款 目的 language is essential: a clause that is too narrow creates problems with banks and clients later, and amendment is costly. We draft these clauses to cover the actual scope of your activities from the outset.
Business Manager Visa Support. If you are incorporating specifically to obtain or maintain a 経営管理 visa, the entity structure, capital level, office arrangement, and business plan all affect the immigration outcome. Aplash coordinates the regulatory and corporate setup components so that the structure you incorporate is one that immigration authorities will recognize.
Registered Address. Aplash can arrange a registered office address for qualifying incorporations, subject to availability per engagement.
This article is informational only and does not constitute legal, tax, or regulatory advice. Consult a qualified advisor before acting on the content. Aplash is a regulatory strategy and market entry firm, not a legal or accounting practice. Last updated: May 2026.