This article is written by a Japanese local.
An increasing number of foreign professionals (expats, engineers, creators, etc.) residing in Japan are choosing to step away from corporate employment to start freelance activities, either full-time or as a side business. However, Japan’s tax infrastructure is highly complex and unforgiving. The system is designed to mercilessly collect maximum taxes from those who fail to proactively declare their status.
This article provides an in-depth explanation of two mandatory procedures for doing business as an individual in Japan: the “Kaigyo-todoke” (Notification of Opening a Business) and the “Aoiro Shinkoku” (Blue Return). We will break these down not merely as tax knowledge, but as “defensive practices” to protect your assets and prevent visa complications.
1. Why Are These Procedures Essential for Foreigners?
The Japanese tax office will not automatically detect that you have started a business and guide you toward a favorable tax system. Unless you take the initiative, you will be processed under the “White Return” system, which subjects you to the highest possible tax rates. Submitting these documents establishes two formidable lines of defense:
- Asset Defense from Excessive Taxation: By claiming legal special deductions (up to 650,000 JPY) and accurately recording expenses, you can drastically compress your income tax and resident tax liabilities.
- Solid Proof for Visa Renewal: It serves as powerful, official evidence to the Immigration Bureau that you are legally and stably conducting business in Japan and fulfilling your tax obligations.
2. “Kaigyo-todoke”: The Starting Point of Credibility in Japan
The official name is the “Notification of Opening, Relocation or Closing of Sole Proprietorship.” This is a public document declaring to the Japanese government that you have established yourself as an independent sole proprietor.
Deadlines and Legal Meaning
As a rule, this must be submitted to your local tax office within one month of starting your business. There is no fee to submit it. While there are no direct penalties for late submission, missing this window can trigger a fatal disadvantage: missing the strict deadline for the highly beneficial “Blue Return” application.
Defense Mechanism for Bank Accounts and Contracts
From the perspective of anti-money laundering regulations, Japanese mega-banks are extremely strict when reviewing applications for “business bank accounts” (accounts with a trade name) by foreigners. A stamped copy of your Kaigyo-todoke is a mandatory document to prove the reality of your business. Furthermore, presenting this document is standard practical procedure when signing a lease for office space or entering into service contracts with Japanese corporations.
3. “Aoiro Shinkoku”: Your Strongest Tax Shield
In Japan, final tax returns are categorized into “White” and “Blue.” If a foreigner wishes to survive and thrive as a freelancer in Japan, selecting the “Blue Return” is an absolute must.
The 650,000 JPY Special Deduction and Carrying Over Losses
The greatest advantage of the Blue Return is that by maintaining accounting books according to official principles (double-entry bookkeeping), you can unconditionally deduct up to 650,000 JPY from your profits. This drastically lowers the calculation base for income tax, resident tax, and National Health Insurance premiums, leaving significantly more cash in your hands. Additionally, if your business operates at a loss, you can carry that deficit forward for up to three years to offset future profits—a highly effective risk hedge during the early stages of a startup.
The Strict Deadline Trap
You cannot simply decide to file a Blue Return during the tax filing season (February to March of the following year). To apply, you must submit the “Application for Approval of Blue Return” to the tax office by March 15th of that year (or within two months of opening a new business). If you miss this deadline by even a single day, you will be mercilessly forced to file under the disadvantageous White Return system for that year.
4. Trouble Cases and Legal Risk Avoidance
Due to the gap between Japanese law and foreign expectations, unique troubles frequently occur. Understand the following risks in advance to build your defense.
Visa Compliance Risks
If you hold a working visa (e.g., Engineer/Specialist in Humanities/International Services) and start freelancing on the side, you risk being charged with “illegal labor” (engaging in activities outside the scope of permitted activities) if your freelance work falls outside your current visa permissions. Depending on the activity, you must proactively apply to the Immigration Bureau for “Permission to Engage in Activity Other Than That Permitted” or, if the business scales, consider changing your visa to a “Business Manager” status.
Expense Misclassification and Tax Audits
Applying your home country’s tax logic to Japan and assuming “everything is a business expense” is extremely dangerous. Japanese tax authorities may conduct retroactive tax audits (Audits) several years later. If they determine you have maliciously underreported income by expensing personal travel or living costs, you will not only face heavy penalty taxes but you will also be deemed to have “poor conduct.” This is a decisive factor for rejection when applying for visa renewals or Permanent Residency.
Conclusion
Success as a freelancer in Japan is largely determined by your initial paperwork. Submitting both the “Kaigyo-todoke” and the “Application for Blue Return” immediately upon starting your business, and setting up cloud accounting software for accurate bookkeeping, is the absolute practical approach to firmly defending your career and livelihood in Japan.