Incorporation & Tax Guide for Foreigners in Japan【2026】From Sole Proprietor to Company: Decision, Corporate Tax, Accounting

More and more foreigners work in Japan as sole proprietors or freelancers, and once a business gets going, the question of "incorporating" (forming a company / 法人成り) comes up. Incorporating significantly changes the types of taxes, how they are calculated, your social insurance, and the accounting workload compared with being a sole proprietor. This article organizes the tax and accounting basics a foreigner should know when considering incorporation in Japan, as material for making a decision. It also helps to review the basics of sole proprietor and freelancer taxes before you incorporate.

For the concrete procedures of setting up a company, commercial registration, and starting a business on the "Business Manager" residence status (keiei-kanri visa), our sister site "Zainichi Life Navi" has a detailed startup guide. This article covers the tax and accounting perspective.

① What you'll learn in this article

• Pros and cons of incorporation (from a tax view)
• Differences in taxes and social insurance between a sole proprietor and a company
• How to judge whether to incorporate (the taxable-income threshold concept)
• Taxes a company pays (corporate tax, corporate resident tax, enterprise tax, consumption tax)
• How to set director compensation (basics of "fixed monthly pay")
• Social insurance notes (companies must enroll in principle)
• The flow of corporate accounting, bookkeeping, year-end closing and filing, plus accounting software
• Topics specific to foreign business owners (visa renewal, overseas remittance, leaving Japan)

② Residence status and incorporation (Business Manager visa notes)

Whether a foreigner can set up a company, become a representative or director, and receive director compensation depends on the residence status.

• Permanent Resident, Long-Term Resident, Spouse of Japanese National, Spouse of Permanent Resident: No work restrictions; in principle you may freely set up a company, become a representative, and receive director compensation.
• Work visas such as Engineer/Specialist in Humanities/International Services, Skilled Labor, or Specified Skilled Worker: Limited to the permitted scope of activity. Setting up and registering a company itself may be possible in some cases, but to engage in the "management/administration" of that company as your main occupation, you generally need the "Business Manager" residence status. Focusing on running your own company, or receiving director compensation, while on a work visa may raise an "activities outside your status" problem.
• Starting a new business on a Business Manager visa: There are requirements for capital, a place of business, a business plan, and so on.

The concrete procedures for setting up a company, the requirements of the "Business Manager" status, and how to think about capital and a business plan are explained in detail on our sister site. →Zainichi Life Navi "Company Formation & Startup Guide for Foreigners (Business Manager Visa)" ↗

③ Pros and cons of incorporation (tax view)

Incorporation has pros and cons in both tax and business terms. Here are the main points.

Main advantages

• Tax rate when income is large: Income tax is progressive (the larger the taxable income, the higher the rate, up to 45% plus resident tax), whereas corporate tax is computed within a fixed rate band, so as income grows a company can sometimes keep the tax burden lower.
• Income splitting via director pay: Director compensation paid to yourself or family can use the employment income deduction (subject to conditions).
• Longer loss carry-forward: A company's blue-return losses carry forward up to 10 years (3 years for a sole proprietor's blue return).
• Freely set the fiscal year-end (individuals are fixed to the calendar year, Jan–Dec).
• Credibility: A company can be advantageous for transactions, financing, and hiring.
• Consumption-tax exemption period: There is a period of exemption early on under certain conditions (see below; conditions apply).

Main disadvantages

• Setup and upkeep costs: In addition to registration tax at setup, there are ongoing costs such as tax-accountant fees.
• Per-capita corporate resident tax even when in the red: Even with a loss, the per-capita levy (roughly ¥70,000 per year at the smallest scale, as a guide) is charged.
• Mandatory social insurance: A company must enroll in social insurance (health insurance and employees' pension) even with a single director, increasing premium costs.
• More complex accounting: Double-entry bookkeeping, financial statements, and a corporate tax return are required.
• Company money is not freely usable: Company funds and personal funds must be clearly separated, and withdrawals must follow rules such as director compensation.

④ When to consider incorporating (sole proprietor vs. company)

There is no single right answer to "how much should I earn before incorporating." Generally, once taxable income reaches a certain scale (an often-cited guide is around ¥8–9 million per year), a company is frequently said to be more advantageous in terms of tax burden. However, the break-even point shifts depending on social-insurance premiums, family structure, the nature of the business, and future plans.

⑤ The company-formation flow (tax view) and formation tools

Stock company vs. LLC (godo kaisha)

The common forms in Japan are the stock company (kabushiki kaisha) and the LLC (godo kaisha). An LLC is cheaper to set up and needs no settlement-of-accounts public notice; a stock company is considered more advantageous for credibility and fundraising. As a guide, a stock company costs about ¥200,000–250,000 in registration tax, articles certification, etc., and an LLC about ¥60,000–100,000 (this changes with e-articles and so on; confirm the latest with the Legal Affairs Bureau or a professional).

Main tax filings needed after setup

The preparation of articles and registration documents can be streamlined with online company-formation services (some link to accounting software you use after setup). The registration application itself is the domain of the Legal Affairs Bureau or a judicial scrivener. For the overall picture of company formation and the requirements of the "Business Manager" status, see →Zainichi Life Navi Startup Guide ↗.

⑥ How to set director compensation

After incorporating, the salary you pay yourself becomes "director compensation." For it to count as a deductible expense (loss item) of the company, certain rules must be met.

• Fixed monthly pay (teiki dōgaku kyūyo): Pay the same amount each month. The amount is generally revised within 3 months of the start of the fiscal year. Changing it freely mid-year can create portions that are not deductible.
• Pre-determined pay (jizen kakutei todokede kyūyo): Pay director bonuses, etc., exactly as filed in advance with the tax office.

Setting director pay high has the benefit of income splitting (employment income deduction), but it is also the basis for calculating social-insurance premiums, so premiums rise. The basic approach is to balance corporate tax, income tax, and social insurance together. If you make a family member a director, real substance such as actual duties is required.

⑦ Corporate accounting, bookkeeping, closing and filing (accounting software)

A company keeps books by double-entry and prepares financial statements (balance sheet, profit-and-loss statement, etc.). The corporate and local tax return is generally filed within 2 months of the day after the fiscal year-end (unlike individual returns fixed to Feb–Mar, the filing timing depends on your fiscal year-end).

Main taxes a company pays

Use accounting software to streamline bookkeeping and closing

Corporate bookkeeping and closing are commonly outsourced to a tax accountant, but day-to-day bookkeeping and closing preparation can be made more efficient with cloud accounting software. Two widely used by foreign residents are "Money Forward Cloud Accounting" and "freee Accounting." Both offer bank/card linkage and corporate plans, with free trials. Pricing and features may change, so check each official site for the latest.

⑧ Social insurance (companies must enroll)

A company is a workplace subject to mandatory social insurance (health insurance and employees' pension). Even a company with a single representative must enroll. You switch from the National Health Insurance and National Pension of your sole-proprietor days to the company's health insurance and employees' pension.

Premiums are split between the company and the individual, but in a one-person company the company's share is effectively paid by your own company too, so the burden feels heavy. Premiums are linked to the amount of director compensation, so they must be considered together with how you design director pay.