This article is written by a Japanese local.
“My current company’s salary alone is not enough to live on, so I want to work as an Uber Eats delivery partner on weekends.” “Since I am limited to under 28 hours a week just like when I was an international student, it should be fine to work part-time at a convenience store or restaurant, right?”
If you hold a Japan work visa, such as the “Engineer/Specialist in Humanities/International Services” visa, and are thinking this way, please abandon that idea immediately.
If a foreign national holding a work visa engages in part-time work without accurately understanding the strict rules of the Japanese Immigration Act, they face severe consequences, including deportation in the worst-case scenario. This article thoroughly explains the harsh reality of activities outside those permitted under a work visa, the tax mechanisms through which cash-in-hand payments are inevitably discovered, and the only lawful approach to earning side income.
1. Conclusion: Uber Eats and Convenience Store Jobs are 100% Illegal
To state the conclusion clearly: it is strictly prohibited by law for a foreign national holding a Japan work visa to engage in part-time jobs categorized as “unskilled or physical labor,” such as working at convenience stores, bars, restaurant halls, factory lines, cleaning services, or as an Uber Eats delivery partner, regardless of the reason.
Many foreign nationals fundamentally misunderstand the rule regarding the “Permission to Engage in Activity Other Than That Permitted (up to 28 hours per week)” that they utilized during their student days. This comprehensive permission, which allows an individual to work any part-time job for up to 28 hours, is a privilege granted exclusively to those holding a “Student” or “Dependent” visa.
Once a professional switches to a “Work Visa” upon joining a company, even if they visit the Immigration Services Agency and apply saying, “Please give me permission to work at a convenience store to cover my living expenses,” the application will be rejected 100% at the counter. Working even for a single hour without explicit permission constitutes clear “illegal employment.”
2. The Illusion of “Cash Payments Won’t Be Caught”: How the System Catches Violations
A common rumor circulating within foreign communities is that “if you receive your part-time wages in cash by hand rather than through a bank transfer, the Immigration Bureau will never find out.” This is entirely an illusion with no basis in fact. In modern Japan, “hidden income outside of your main job” is completely transparent to the authorities through the following mechanism:
Linking via My Number and the “Salary Payment Report”
Any business that employs a part-time worker (such as a convenience store or restaurant) is legally obligated to submit a “Salary Payment Report” showing exactly who they paid and how much to the local municipal office where the employee resides. During this process, the individual is explicitly identified via their My Number.
Illegal Employment is Exposed via the “Taxation Certificate” During Visa Renewal
The municipality aggregates the income report from your main employer and the income report from your part-time job to calculate your “Resident Tax” and issues a official “Taxation Certificate (Kazei Shomeisho).” When you apply to renew your Japan work visa, you are legally required to submit this certificate to immigration.
Immigration examiners are professionals. They compare the annual income you are supposed to be receiving from your main company with the total gross income stated on your Taxation Certificate. They will instantly deduce: “This income is higher than the salary from their main job. This person is secretly engaging in unauthorized activities (illegal employment).”
3. Fatal Penalties Awaiting Upon the Discovery of Illegal Employment
If illegal employment through a part-time job is discovered, extremely heavy penalties will be imposed. The excuse of “I didn’t know the rules” is never accepted under Japanese law.
- Immediate Denial of Visa Renewal or Status Change: Your work visa renewal will be denied, cutting short your career and life plans in Japan.
- Devastating Damage to Future Permanent Residency Applications: Because a record of legal non-compliance remains on your file permanently, obtaining Permanent Residency in the future becomes virtually impossible.
- Deportation (Forced Removal): If the violation is deemed malicious, deportation procedures under Article 24 of the Immigration Act will be enforced, and you will be barred from re-entering Japan for a minimum of 5 years.
4. The Only Side Jobs Legally Permitted Under a Japan Work Visa
Does this mean that foreign nationals holding a work visa can absolutely never engage in a side business or side job? Actually, only activities that utilize your advanced expertise (matching your university major or current professional duties) can exceptionally be approved as a lawful side job.
Rather than simple labor, if the side job consists of high-level professional duties that fall within the permitted activity scope of a standard work visa, you can legally engage in that side job by obtaining “Individual Permission” from the Immigration Services Agency in advance.
【Examples of Approved Expert Side Jobs】
- Working as a “Language Instructor” teaching your native language at a private language school on weekends.
- Accepting outsourcing contracts from other companies to perform “Translation or Interpretation” duties.
- If your main job is an IT engineer, helping another company with system development or programming on your days off.
5. Strict Requirements to Obtain Individual Permission
Obtaining this “Individual Permission” is incomparably more difficult and complex than the comprehensive part-time job permission granted to students. You must logically prove, through objective documentation, that you meet all of the following requirements:
- Existence of a Contract with the Side Employer: A contract or official document clearly defining which company you will work for, what specific duties you will perform, and for how many hours per week is required. (The location and hours must be clearly specified).
- Consent from Your Main Employer: Many companies in Japan prohibit side jobs in their employment regulations. You must obtain a written consent form (permission slip) from your main employer stating that they agree to your side job.
- No Interference with Main Duties: If the hours for the side job are too long and deemed to hinder your performance at your main job, permission will be denied. The relationship must remain strictly “main job as primary, side job as secondary.”
6. Conclusion: Prioritize Your Long-Term Career Over Immediate Cash
For foreign professionals holding a Japan work visa, engaging in unauthorized simple labor such as convenience store work or Uber Eats delivery is a self-destructive act that can completely shatter your life in Japan.
If you must start a side job to support your livelihood, you should first look for high-level duties that can leverage your professional expertise, obtain consent from your main company, and then apply for the “Permission to Engage in Activity Other Than That Permitted (Individual Permission)” by fulfilling the strict legal requirements. Following objective and lawful procedures is the only way to safeguard your career and livelihood in Japan.