If you are a salaried employee who makes a little extra money on the side, we have some good news for you.

Under Japan’s Income Tax Law, you might not actually need to file a tax return.

Here is everything you need to know about the widely discussed “200,000 yen rule.”

The Basics of the 200,000 Yen Rule

In Japan, most company employees do not need to file their own taxes because their employer handles it for them through a system called Nenmatsu Chosei (Year-end Tax Adjustment).

This process calculates and finalizes your national income tax for the year straight from your salary.

But what happens if you earn money outside of your main job? Perhaps you do freelance translation, sell items online, or offer private language lessons.

According to Japanese tax law, if your main employer completes your Nenmatsu Chosei, and your side income for the calendar year (January 1st to December 31st) is 200,000 yen or less, you are generally exempt from filing a national income tax return (Kakutei Shinkoku).

It is important to note that this 200,000 yen threshold applies to your net income (total revenue minus deductible business expenses), not your gross sales.

Eligibility: Who Can Use This Exemption?

To legally bypass filing a national tax return for your side income, you must meet a specific set of criteria. This exemption is designed specifically for standard salaried workers. You qualify if:

• You have a primary employer: Your main company must be responsible for submitting your Nenmatsu Chosei.
• Your salary is within limits: Your primary annual salary must not exceed 20 million yen.
• Your side income is strictly 200,000 yen or below: If your net profit hits 200,001 yen, you must file a national tax return.

A Crucial Exception: If you are required to file a Kakutei Shinkoku for any other reason—such as claiming first-year mortgage deductions, high medical expense deductions, or standard Furusato Nozei (hometown tax) without using the One-Stop Exception system—this 200,000 yen rule becomes invalid.

Once you file a return, you are legally required to declare all streams of income, no matter how small.

The Hidden Catch: Resident Tax (Juminzei)

The 200,000 yen exemption rule applies only to National Income Tax. It does not apply to your local Resident Tax (Juminzei).

Your local municipality requires you to report every single yen you earn to properly calculate your local taxes for the following year.

Therefore, even if your side income is in just 50,000 yen and you are exempt from the national Kakutei Shinkoku, you are still legally obligated to submit a separate Resident Tax declaration to your local city or ward office.

To stay compliant, always keep accurate records and receipts of your side income. Staying informed is the best way to enjoy your side income without worrying about future tax penalties!