Sole Proprietorship in Japan: A Practical Guide for Foreign Founders

Starting a sole proprietorship in Japan is one of the simplest ways to begin doing business here. It is a common structure for freelancers, consultants, creators, small service providers, and founders testing a business idea before incorporation.

In Japanese, a sole proprietorship is called 個人事業 (kojin jigyo), and the owner is called a 個人事業主 (kojin jigyonushi). The setup process is much lighter than forming a company, but immigration status, taxes, bookkeeping, licenses, and social insurance still matter from day one.

This guide explains what a sole proprietorship in Japan is, who it fits, how foreigners start one, and how to register step by step.

What Is a Sole Proprietorship in Japan?

A sole proprietorship in Japan is a business owned by an individual. You do not create a separate legal entity like a Godo Kaisha (GK) or Kabushiki Kaisha (KK). The business and the owner are legally connected.

That creates two important consequences.

First, setup is simple. You do not register a company at the Legal Affairs Bureau. You notify the tax office that you have started business activity by filing a 開業届 (Kaigyo Todoke), the notification of opening a sole proprietorship.

Second, you have unlimited personal liability. If the business owes money, has a contract dispute, or causes damage, your personal assets are exposed. This is one reason founders transition from a sole proprietorship to a company as the business grows.

A few terms you will see in Japan:

• 個人事業 (kojin jigyo): sole proprietorship or individual business
• 個人事業主 (kojin jigyonushi): sole proprietor
• 開業届 (Kaigyo Todoke): business opening notification filed with the tax office
• 屋号 (yago): optional trade name used by the sole proprietor
• 青色申告 (Aoiro Shinkoku): Blue Return tax filing system with tax benefits

A sole proprietorship is not an incorporation. It is a way to operate as an individual business owner.

Who Is a Sole Proprietorship Best For?

A sole proprietorship is a strong fit when you want to start small and keep the paperwork light.

It works well for:

• Freelancers
• Consultants
• Designers, writers, developers, and creators
• Language teachers and coaches
• Small local service businesses
• Solo online businesses
• Side businesses, when your visa status allows the activity
• Early market testing before incorporation

It is the wrong structure for raising investment, hiring a larger team, signing high-risk contracts, opening a regulated business without license planning, or building a company that needs strong credibility with banks, vendors, and enterprise clients.

It is also the wrong starting point when your main goal is a visa strategy. A sole proprietorship and immigration permission are separate issues. Filing a Kaigyo Todoke does not give a foreign founder the right to work in Japan.

If you are still deciding whether Japan is the right market, do basic market research in Japan before choosing a legal structure.

Can Foreigners Start a Sole Proprietorship in Japan?

Yes, foreigners can start sole proprietorships in Japan. The key question is not only “Can I file the form?” It is also “Does my residence status allow me to operate this business?”

Japan separates business registration from immigration permission.

Filing a Kaigyo Todoke with the tax office does not give you a visa. It also does not permit you to earn business income when your current residence status restricts that activity.

Foreign residents with fewer work restrictions

The following residence statuses have broad work freedom:

• Permanent Resident
• Spouse or Child of a Japanese National
• Spouse or Child of a Permanent Resident
• Long-Term Resident

If you hold one of these statuses, the immigration side is more straightforward. You still need to handle tax, licensing, banking, and local administrative requirements.

Work visa holders

If you are on a work visa, including an Engineer/Specialist in Humanities/International Services, your permitted activities are tied to the scope of that residence status and your work arrangement.

Employer approval alone is not enough when your side business falls outside your permitted status. You need Permission to Engage in Activity Other Than That Permitted (資格外活動許可) from the Immigration Services Agency for activities outside your current status.

This matters because a small side business creates immigration risk when it does not match your approved activity.

Students and dependents

Students and dependents need permission for income-generating activities. The common comprehensive permission is designed for part-time work within hour limits, not for operating a full independent business. Confirm your immigration position before accepting clients.

Business Manager Visa caveat

A sole proprietorship is not the practical route for foreign founders seeking a Business Manager Visa.

The current Business Manager Visa framework requires a business scale of ¥30,000,000 or more in capital or invested business costs, at least one qualifying full-time employee, a business office, proof of Japanese-language capacity at approximately JLPT N2 / BJT 400+ level by the applicant or qualifying employee, and a business plan reviewed by a qualified professional.

Immigration guidance includes individual-business cases, but the requirement is still ¥30,000,000 or more in invested business costs for items like office setup, equipment, and one year of employee salary. For most foreign founders who need a residence strategy, a KK or GK is the cleaner structure to discuss with an immigration professional.

If your goal is to live in Japan and operate the business yourself, plan the business structure and visa route together before filing anything.

Sole Proprietorship vs GK vs KK

Here is the simple version.

Japan no longer has a ¥1,000,000 legal minimum capital requirement for KK or GK. Legally, a company starts with ¥1 or more. For bank credibility, founders should budget at least ¥1,000,000 in capital. For Business Manager Visa planning, founders need ¥30,000,000 or more in capital or invested business costs under the current framework.

Baseline government registration costs are also different:

• Sole proprietorship Kaigyo Todoke: ¥0
• GK registration tax: ¥60,000
• KK registration tax: ¥150,000 minimum, or 0.7% of paid-in capital if higher

SmartStart Japan’s cost guide gives broader setup ranges of ¥55,000-¥110,000 for sole proprietorship support, ¥137,000-¥410,000 for GK setup, and ¥332,000-¥550,000 for KK setup when support costs are included. Compare the cost of setting up a company in Japan before deciding.

If you are unsure which structure fits your situation, compare the types of companies in Japan and SmartStart Japan’s broader guide to setting up a business in Japan.

How to Register a Sole Proprietorship in Japan

This is the core process. A sole proprietorship is not registered at the Legal Affairs Bureau. That office handles company registration.

For a sole proprietorship, you file with the local tax office (税務署 / Zeimusho).

Step 1: Confirm your residence status and right to operate

Before preparing forms, confirm that your residence status allows you to run the business.

Check these points:

• Your residence status gives you broad work freedom, or
• Your planned business activity matches your permitted work activity, or
• You have permission for activities outside your current status, or
• You have a separate visa plan for the business

Solve the immigration question first. The tax office accepts tax filings for business activity, but Immigration decides whether the activity is permitted under your residence status.

Step 2: Check the license for your business activity

Many small service businesses do not need a special license. Regulated industries do.

The following business types require a license or permit planning before launch:

• Restaurants, cafes, and bars that prepare or serve food
• Food production and food sales
• Travel agency services
• Real estate brokerage
• Recruitment and employment placement
• Alcohol sales
• Daycare and childcare services
• Regulated imports, including products controlled by food, pharmaceutical, plant, animal, alcohol, or safety rules

Do not assume that filing a Kaigyo Todoke is enough. If your business activity is regulated, check the license before launching. SmartStart Japan has a guide to business licenses in Japan that explains the common license categories.

For specific regulated business examples, see SmartStart Japan’s guides to opening a restaurant in Japan, starting a travel business in Japan, and creating a recruitment agency in Japan.

Step 3: Decide your business start date, address, and trade name

Prepare three practical details before filing.

Your business start date is the date you begin operating or preparing to operate as a business. This is not only the day you earn your first sale. It includes the day you begin offering services, signing contracts, or formally starting business activity.

Your business address is your home office, rented office, shop, or other place of business. Check your lease and building rules before using a residence as a business address, especially when clients visit, signage appears, deliveries arrive, or official mail goes there. If you need a workspace, SmartStart Japan has a guide to rental offices in Japan and a list of co-working spaces in Japan.

Your trade name (屋号 / yago) is optional. Many freelancers use their personal name. Others use a business name for invoices, websites, and bank account applications.

A trade name does not create a company. It is simply a name used by the individual business.

Step 4: Prepare your basic information and documents

The Kaigyo Todoke is short, but prepare the necessary information before you go to the tax office or file online.

Prepare:

• Your name and address
• My Number information
• Your business address
• Business start date
• Description of your business activity
• Optional trade name
• Blue Return decision
• Employee or family-worker information
• Identification documents
• Residence card and passport for foreign residents

For paper filings that include My Number, prepare identity verification. For e-Tax filing, identity verification is handled through the online filing process.

Step 5: File the Kaigyo Todoke with the tax office

Submit the Kaigyo Todoke to the tax office that has jurisdiction over your tax address.

You file:

• In person at the tax office
• By mail
• Online through e-Tax

File the Kaigyo Todoke within 1 month of starting the business. This is the practical target because it keeps your tax setup clean and protects the timing for Blue Return.

The final tax return deadline for the year in which the business started is the outer legal boundary. For a business started at any time in 2026, the outer deadline is March 15, 2027. Do not treat that as the working target.

Filing within the first month helps with:

• Blue Return timing
• Business bank account applications
• Proof of business activity
• Accounting setup
• Clean records from the beginning

In-person filing is completed at the tax office counter when the form is accepted. There is no 2 to 3-week corporate registration wait because you are not incorporating a company.

For more details on tax filings after setup, see SmartStart Japan’s guide to tax office notification.

Step 6: Keep a submitted copy or filing confirmation

Always keep proof that you filed.

If you submit in person or by mail, prepare a copy and ask for a receipt stamp. If you file online, keep the electronic confirmation.

You need this later for:

• Bank account applications
• Loan applications
• Subsidy applications
• Tax accountant onboarding
• Client or platform verification
• Internal records

Japan is paperwork-heavy compared with many countries. Keeping the copy from day one saves trouble later.

Step 7: Apply for Blue Return if you want the tax benefits

Blue Return (青色申告 / Aoiro Shinkoku) is one of the most important tax choices for sole proprietors in Japan.

Blue Return gives three deduction levels:

• ¥650,000: proper double-entry bookkeeping plus e-Tax filing or qualifying electronic bookkeeping
• ¥550,000: proper double-entry bookkeeping and on-time filing without the extra electronic filing or qualifying electronic bookkeeping condition
• ¥100,000: simplified bookkeeping or cases that do not meet the ¥550,000 or ¥650,000 requirements

Blue Return also helps with:

• Carrying forward business losses
• More favorable treatment for certain family employee salaries
• Better accounting discipline
• Cleaner records for future loans or incorporation

The deadline matters. Apply by March 15 of the year you want to use Blue Return. If you start a new business on or after January 16, apply within 2 months of starting.

Do not leave this until tax season. If you miss the deadline, you lose the Blue Return benefit for that year.

Step 8: Set up receipts, bookkeeping, and a dedicated bank account

Once you file, treat the business like a business.

Set up a simple system for:

• Sales invoices
• Customer receipts
• Supplier invoices
• Contracts
• Bank records
• Expense receipts
• Tax filings
• License documents for regulated businesses

A dedicated bank account is recommended for clean accounting. It also looks cleaner when you apply for a loan, open a business account, work with an accountant, or convert to a company.

If you want a practical banking option, see this guide to opening a GMO Aozora account.

For recordkeeping, SmartStart Japan also has a useful guide on how to file Japanese receipts. If your records are already getting messy, review accounting services for startups in Japan.

Step 9: Handle city or ward office obligations

The tax office is not the only place that matters.

Sole proprietors who are not covered through an employer system enroll in:

• National Health Insurance
• National Pension

Japan’s public pension system covers residents aged 20 to 59 through the National Pension, while employees are covered through the Employees’ Pension Insurance. Sole proprietors are outside company’s social insurance, so city or ward office procedures become important.

Handle these procedures early. Back payments and administrative confusion are not fun companions for a new business.

Step 10: Decide whether invoice issuer registration is needed

Japan’s invoice system matters especially when your clients are businesses.

If you register as a qualified invoice issuer, you issue qualified invoices. This is important for B2B clients who claim input tax credits.

Registering as a qualified invoice issuer also creates consumption tax obligations for a business that was previously exempt from consumption tax. This is not a box to tick casually.

Invoice issuer registration is the right topic to review when:

• You mainly serve corporate clients
• Clients ask for qualified invoices
• Your competitors are registered invoice issuers
• You expect taxable sales to grow
• You already need to be a consumption taxpayer

Discuss the decision with a tax accountant before registering.

What Does It Cost and How Long Does It Take?

Filing a Kaigyo Todoke has a government filing fee of ¥0.

In-person filing at the tax office is completed when the counter accepts the form. Online filing through e-Tax is also available.

The filing itself is quick. The full business launch timeline is driven by the surrounding work:

• Immigration permission
• License applications
• Bank account setup
• Blue Return preparation
• Accounting software
• Invoice issuer registration
• Business insurance
• Office or lease checks

A realistic timeline looks like this:

• Tax office notification: same visit for in-person filing after the form is accepted
• License applications: plan for 2 to 3 months for regulated industries
• Company incorporation alternative: SmartStart Japan’s cost guide notes that a poorly handled incorporation process takes over 2 months
• Ready for larger clients: after banking, invoices, records, Japanese materials, and credibility documents are in place

Starting a sole proprietorship is simple. Starting one properly takes planning.

If you are still estimating startup costs, compare the cost of self-employment with the cost of setting up a company in Japan.

Taxes and Ongoing Compliance

Sole proprietors in Japan report business income through their personal tax return. The tax year for individuals is January 1 to December 31.

The final tax return, called 確定申告 (Kakutei Shinkoku), is filed between February 16 and March 15 of the following year. For 2026 income, the filing period runs from February 16, 2027, to March 15, 2027.

Common tax and compliance items include:

• Income tax: Progressive national income tax from 5% to 45%
• Reconstruction surtax: 2.1% of national income tax through 2037
• Resident tax: Local tax based on the previous year’s income
• Individual enterprise tax: Applies to covered business categories above the statutory deduction threshold
• Consumption tax: Applies when taxable sales and invoice registration rules trigger the obligation
• Blue Return: Valuable for sole proprietors who keep proper books and file on time
• Withholding tax: Applies when you pay certain types of compensation or hire people

Do not rely on rough tax percentages alone. Deductions, business expenses, consumption tax status, and local tax change the final amount.

For a broader tax overview, see SmartStart Japan’s guide to Japanese taxes for new businesses. For tax planning ideas once you become profitable, see SmartStart Japan’s guide to tax reduction in Japan.

Banking, Receipts, and Recordkeeping

Many first-time sole proprietors mix personal and business spending. It feels easy at the beginning, but it becomes painful during tax season.

A cleaner setup uses:

• One bank account mainly for business income and expenses
• One credit card or payment method for business expenses
• A cloud accounting tool or an organized spreadsheet
• A monthly habit of saving receipts and invoices
• A folder for contracts and official filings

You do not need a complex system on day one. You do need a system you will actually use.

Good records help with:

• Tax filing
• Blue Return compliance
• Bank account applications
• Loan applications
• Subsidies
• Client disputes
• Future incorporation

Japan rewards clean paperwork. It is not glamorous, but it keeps doors open.

When Should You Incorporate Instead?

A sole proprietorship is useful, but it is not the best long-term structure for every business.

Incorporate a GK or KK when:

• Your business has a meaningful liability risk
• You plan to hire employees
• You want to raise investment
• You need stronger credibility with Japanese companies
• You are signing larger contracts
• You want a clearer separation between personal and business assets
• You are planning a Business Manager Visa strategy
• Your revenue has grown enough for company taxation to become attractive
• A bank, partner, or client expects a corporate structure

Many founders begin as sole proprietors and incorporate later. That is normal. The key is knowing when the simple structure has become too small for the business.

If you are approaching that stage, read SmartStart Japan’s guide on moving from sole proprietor to company. If you are already leaning toward incorporation, compare Godo Kaisha in Japan and Kabushiki Kaisha in Japan.

Getting Your First Customers

The legal setup is only one part of starting. You also need to make the business understandable and trustworthy to Japanese customers.

For local sales, prepare the basics:

• A clear Japanese service description
• A simple website or landing page
• Proper invoices and contact details
• Japanese business cards for meetings
• A reliable response process for inquiries
• Proof of experience, testimonials, or case studies

If you sell to companies, business etiquette still matters. A well-prepared Japanese business card helps you look serious in meetings. If you need a steady pipeline, Scaling Your Company has a guide to lead generation in Japan.

For product businesses, sales channels matter more than company structure at the beginning. If you plan to sell through partners, review how to choose a distribution partner in Japan. If you plan to sell online, start with the guide to ecommerce in Japan.

Final Checklist for Starting a Sole Proprietorship in Japan

Before you start:

• Confirm your residence status allows the activity
• Check the license for your business activity
• Decide on your business start date
• Choose whether to use a trade name
• Prepare your address, My Number, ID, and business description
• File the Kaigyo Todoke with the tax office
• Keep a submitted copy or electronic confirmation
• Apply for Blue Return on time
• Set up bookkeeping and receipt storage
• Open or designate a dedicated bank account
• Complete National Health Insurance and National Pension procedures
• Decide whether invoice issuer registration fits your client base
• Review whether sole proprietorship still fits as the business grows

If your situation involves immigration, licensing, hiring, or B2B invoicing, get advice before you start accepting revenue. Fixing the setup later is harder than doing it cleanly from the beginning.

FAQ: Sole Proprietorship in Japan

Do I register a sole proprietorship at the Legal Affairs Bureau?

No. The Legal Affairs Bureau handles company registration, including GK and KK incorporation. A sole proprietorship is opened by filing a Kaigyo Todoke with the local tax office.

How much does it cost to register a sole proprietorship in Japan?

The Kaigyo Todoke government filing fee is ¥0. Additional costs come from accounting software, a tax accountant, licenses, translation, office setup, banking, and immigration advice.

How long does it take?

In-person tax office filing is completed when the counter accepts the form. The full business setup timeline is longer when you need a license, bank account, invoice issuer registration, or immigration permission.

Can I start a sole proprietorship without a Japanese company?

Yes. A sole proprietorship is not a company. You operate as an individual business owner.

Do I need a visa to start a sole proprietorship?

You need a residence status that allows the business activity you plan to perform. Filing with the tax office does not grant immigration permission. If your status restricts work, confirm your situation before operating.

Can I get a Business Manager Visa through a sole proprietorship?

It is not the practical route. Current immigration guidance includes individual-business cases, but the requirements are strict: ¥30,000,000 or more in capital or invested business costs, at least one qualifying full-time employee, a business office, Japanese-language capacity, and a professionally reviewed business plan. Most foreign founders planning a Business Manager Visa should discuss a KK or GK structure with an immigration professional.

Do I need Blue Return?

Yes, if you want the main tax benefit available to sole proprietors. Blue Return gives deductions of ¥650,000, ¥550,000, or ¥100,000 based on bookkeeping and filing method. Apply by March 15, or within 2 months of starting when you begin business on or after January 16.

Do I need a business bank account?

A dedicated account is recommended. It makes bookkeeping, tax filing, and business verification much easier.

Do I need to register for the invoice system?

Register when B2B clients require qualified invoices or when your consumption tax position makes registration worthwhile. Qualified invoice issuer registration creates consumption tax obligations for businesses that were previously exempt, so review the decision with a tax accountant before registering.

Can I switch from a sole proprietorship to a company later?

Yes. Many people start as sole proprietors and incorporate later when liability, hiring, revenue, or visa planning makes a company more appropriate.