Working Two Jobs in Japan: Tax Implications for Expats with Side Gigs

Unlock the potential of a second income stream without fearing the tax office. We explain the “200,000 Yen Rule,” how to keep your side gig private from your main employer, and the essential visa steps every expat must take to work two jobs legally and profitably.

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Why Everyone Is Talking About “Fukugyo”

If you have been living in Japan for a while, you may have noticed a shift in the workplace atmosphere. A few years ago, the idea of working a second job was almost taboo. The traditional Japanese “salaryman” culture demanded 100% loyalty to a single company. However, times are changing rapidly. The Japanese government is now actively encouraging “Fukugyo” (side jobs) to boost the economy and help workers cope with rising living costs.

For expats, this is fantastic news. Whether you want to teach English on weekends, do freelance graphic design, or sell handmade goods online, the opportunity to earn extra Yen is right at your fingertips. It can be the difference between just getting by and actually saving for a house or a dream vacation.

However, having two income streams introduces a layer of complexity to your life that you might not be used to. You probably have questions keeping you up at night: “Will my main company find out?” “Do I need a different visa?” “How do I pay taxes on this extra cash?”

Do not worry. While the Japanese tax system is strict, it is also logical. In this guide, we will walk you through everything you need to know about managing a side hustle. We will cover the legal requirements, the tax thresholds that matter, and the specific box you need to check on your tax return to keep your privacy intact.

First Things First: Can You Legally Work Two Jobs?

Before we count your extra money, we need to make sure you are allowed to earn it. Your ability to work a second job depends entirely on your visa status.

If you are a Permanent Resident, a Spouse of a Japanese National, or a Long-Term Resident, you have no restrictions. You can work as a barista, a coder, or a model, regardless of your main job.

However, if you are here on a standard work visa (like “Engineer/Specialist in Humanities/International Services” or “Instructor”), you need to be careful. Your visa permits you to work in a specific field.

The “Same Category” Rule

If your side job falls into the same category as your visa, you are generally safe. For example, if you have an “Instructor” visa to teach at a high school, and you take a side job teaching adults at an Eikaiwa (conversation school) on weekends, this is usually fine because both are teaching activities covered by your visa.

The “Different Category” Danger

If you have an “Engineer” visa but want to work part-time at a Starbucks or deliver food for Uber Eats, you are technically violating your visa conditions. To do this legally, you must apply for “Permission to Engage in Activity Other Than That Permitted under the Status of Residence Previously Granted” (Shikakugai Katsudo Kyoka) at the Immigration Bureau. It sounds intimidating, but it is a standard procedure.

Freelancing in Japan: How to Go Solo (Visa & Tax Tips)

Checking Your Company Rules

Even if the government says yes, your boss might say no. Most Japanese employment contracts have a section called “Shugyo Kisoku” (Rules of Employment). In the past, almost all companies had a clause explicitly banning side jobs.

Today, many modern companies have removed this ban, or they allow it if you simply notify them. However, traditional companies may still strictly prohibit it to ensure you are not tired or sharing trade secrets.

Why Privacy Matters

If your company bans side jobs but you decide to do one anyway (which many people do), your biggest risk is not immigration—it is your company finding out through your taxes. We will explain exactly how to prevent this in the “Residence Tax” section below.

The Magic Number: The 200,000 Yen Rule

When it comes to Income Tax (Shotoku-zei), there is one number you need to memorize: 200,000 Yen.

This is the annual profit threshold that determines whether you need to file a tax return.

Scenario A: Profit Under 200,000 Yen

If your profit (Income minus Expenses) from your side job is less than 200,000 JPY for the calendar year (January 1 to December 31), you generally do not need to file a Final Income Tax Return (Kakutei Shinkoku) to the national tax office. The government considers this amount too small to worry about for national income tax purposes.

Scenario B: Profit Over 200,000 Yen

If your profit exceeds 200,000 JPY, you must file a tax return. Ignoring this is tax evasion. You will need to aggregate your main salary and your side income, calculate the total tax, and pay the difference.

Important Note: Even if you earn less than 200,000 JPY and skip the National Income Tax return, you are technically still required to report that income to your local city office for Residence Tax purposes. Many people overlook this, but strictly speaking, Residence Tax applies to all income, starting from 1 yen.

Japanese Income Tax Guide for Foreign Workers (2025)

The Two Types of Tax Filings

To understand why a side job complicates things, you need to understand how taxes are usually filed in Japan.

1. Year-End Adjustment (Nenmatsu Chosei)

If you only have one job, your company handles everything. In December, you fill out a small form, and the company calculates your exact tax liability. They deduct it or refund you in your December paycheck. This is easy and stress-free.

2. Final Tax Return (Kakutei Shinkoku)

If you have a side job earning over 200,000 JPY, the Year-End Adjustment is not enough. Your company cannot file taxes for money they didn’t pay you. Therefore, you must file a “Kakutei Shinkoku” by yourself between February 16 and March 15 of the following year.

On this form, you will enter:

• The salary from your main job (from your Withholding Slip / Gensen Choshu Hyo).
• The income from your side job.
• Any business expenses.

How Your Boss Finds Out: The Residence Tax Trap

This is the specific mechanic that exposes most secret side hustlers.

In Japan, your Residence Tax (Juminzei) is billed based on your total income from the previous year.

Typically, the city hall sends the bill for your total Residence Tax directly to your main employer. Your employer then deducts this amount from your monthly paycheck (Special Collection).

The “Wait a Minute” Moment

Imagine you earn 4 million yen at your main job. Your payroll department expects your Residence Tax to be a certain amount based on that 4 million yen.

But, because you earned an extra 2 million yen on the side, the city hall bills your company for taxes on 6 million yen.

The payroll staff will see this much higher tax bill and instantly know: “This employee has other income.”

The Solution: Ordinary Collection

To prevent this, you must intervene during the tax filing process. When you file your Final Tax Return (Kakutei Shinkoku), there is a specific section regarding Residence Tax.

It asks: “How would you like to pay Residence Tax on income other than your main salary?”

You will see two checkboxes:

1. Special Collection (Tokubetsu Choshu): Deduct from main salary. (Do NOT check this if you want privacy).
2. Ordinary Collection (Futsu Choshu): Send the bill to my home. (Check this one).

By checking “Ordinary Collection,” the tax on your main salary still goes to your company, but the tax on your side hustle is sent to your home mailbox. You pay it yourself at a convenience store, and your company remains unaware of the extra income.

Residence Tax in Japan: Understanding Your Ward/City Tax Bill

What Counts as a Side Job?

For tax purposes, the nature of your income matters. Side income is usually classified in one of two ways:

1. Salary Income (Kyuyo Shotoku)

This happens if you work part-time at another company and receive a payslip. For example, working Saturdays at a cafe or teaching at an Eikaiwa that hires you as a part-time employee.

• Risk: It is very difficult to hide this from your main employer because “Salary Income” is almost always subject to “Special Collection” for Residence Tax. The city hall often insists on combining salary taxes.

2. Miscellaneous/Business Income (Zatsu/Jigyo Shotoku)

This applies if you are a freelancer, Uber Eats driver, or consultant. You invoice clients and get paid gross amounts.

• Benefit: You have much more control. You can deduct expenses, and you can easily choose “Ordinary Collection” to pay the tax yourself.

Understanding Your Japanese Payslip: Taxes, Pension, and Deductions Explained

Comparison: Main Job Only vs. Two Jobs

To clarify the differences, here is a breakdown of your responsibilities.

Feature	Main Job Only	Main Job + Side Gig
Filing Method	Company does it (Nenmatsu Chosei)	You do it (Kakutei Shinkoku)
Tax Form Deadline	Mid-December (Internal)	March 15th (Tax Office)
Residence Tax	Deducted from Salary	Split: Salary deducted, Side gig paid by you
Expense Deductions	Limited	Allowed (for side gig portion)
Privacy Risk	None	High (unless managed correctly)

Reducing Your Tax Bill: Expenses

One of the biggest advantages of having freelance side income (Business Income) is the ability to deduct expenses. This lowers your “taxable income.”

If you earn 500,000 JPY from freelance writing, but you spent 100,000 JPY on a new laptop and 50,000 JPY on internet fees, your taxable income is only 350,000 JPY.

Common Deductible Expenses:

• Transportation: Train and bus fares to meet clients.
• Communications: A portion of your internet and smartphone bill.
• Equipment: Computers, cameras, or tools used for work.
• Space: If you work from home, you may be able to deduct a portion of your rent and electricity (based on square footage and hours worked).
• Meetings: Coffee or meals with clients (keep the receipts!).

Receipt Management

You must keep receipts for everything. In Japan, the tax office (Zeimusho) generally requires you to keep financial records for 7 years. You don’t need to submit the receipts when you file, but you must have them ready if you are audited.

Bookkeeping 101: Accounting Tips for New Expat Entrepreneurs

Blue Return vs. White Return

If your side hustle grows into a serious business, you should consider the “Blue Return” (Aoiro Shinkoku).

• White Return (Shiro): The default. Simple bookkeeping. Minimal benefits.
• Blue Return (Aoiro): Requires double-entry bookkeeping (more complex). However, it grants you a special tax deduction of up to 650,000 JPY.

For most casual side gigs, the White Return is sufficient. But if you are earning millions of yen on the side, the Blue Return can save you a significant amount of tax.

Business Taxes in Japan: A Guide for Foreign Entrepreneurs

Social Insurance Implications

This is a tricky area. Generally, you pay Social Insurance (Health and Pension) through your main employer.

However, if your side job is a part-time employment contract (not freelance), you might be forced to join social insurance at the second job if:

1. You work more than 20 hours a week at the second job.
2. Your monthly wage is over 88,000 JPY.
3. The company is large enough (over 50 employees).

If this happens, you end up with two health insurance cards and split pension payments. This is an administrative nightmare and will definitely alert your main employer (since primary and secondary insurers have to coordinate).

Strategy: As an expat with a main job, it is usually safer to keep side jobs as “Freelance/Contract” work rather than “Employment” to avoid this double-enrollment issue.

Japan National Pension Guide for Expats: Enrolling & Benefits

Step-by-Step Guide to Filing Your Taxes

If you have crossed the 200,000 JPY threshold, here is your game plan for February.

1. Gather Documents

• Gensen Choshu Hyo: The tax slip from your main employer (received in Dec/Jan).
• Payment Records: Proof of income from your side job (bank statements or payment reports from platforms).
• Expense Receipts: Organized by category.
• My Number Card: Essential for online filing.

2. Use e-Tax

The Japanese government’s e-Tax website is the easiest way to file. It has a section for “Creating a Tax Return.” You can use Google Translate or browser extensions to navigate it if your Japanese is limited.

You will input your main salary in Section A and your side business income in the “Business” or “Miscellaneous” section.

3. Check “Ordinary Collection”

As mentioned, when you reach the Residence Tax section, select “Futsu Choshu” (pay by myself).

4. Submit and Pay

Submit the form online. If you owe tax, you can pay via credit card, convenience store, or bank transfer by March 15th.

Filing Taxes Online (e-Tax) in Japan A Guide for Expats

Common Mistakes to Avoid

1. Ignoring the 200k Rule

“It’s just a little bit of money, they won’t notice.” This is dangerous. The tax office can see bank transfers. If a company paid you, they likely reported that payment to the tax office as an expense. The tax office knows you received it. If you don’t report it, it flags a discrepancy.

2. Losing Receipts

Trying to reconstruct your expenses from memory in March is impossible. Use an app or a simple shoebox to collect receipts throughout the year.

3. Confusing Revenue with Profit

The 200,000 JPY threshold is for profit (Income – Expenses). If you made 300,000 JPY in sales but spent 150,000 JPY on materials, your profit is 150,000 JPY. You technically don’t need to file a national tax return (though you still should for residence tax).

Conclusion: Hustle Smart

Working two jobs in Japan is a fantastic way to accelerate your financial goals. Whether you are saving for a house, investing, or just enjoying more sushi dinners, that extra income is powerful.

The tax implications might seem daunting at first, but they are manageable. By understanding the difference between the Year-End Adjustment and the Final Tax Return, and by knowing the “Ordinary Collection” trick for residence tax, you can maintain your privacy and stay compliant.

Don’t let the fear of paperwork stop you. With a little organization and the right knowledge, you can turn your side hustle into a smooth, profitable, and stress-free part of your Japanese life.

Disclaimer

This article is for general informational purposes only and does not constitute professional advice. Laws, prices and regulations vary by location and change over time. Consult a qualified professional for guidance on your specific situation.