freee
フリーCloud accounting software · freee K.K.
- Fees
- Varies
- English
- No
Beginner-friendly cloud accounting built around guided workflows, popular with sole proprietors for blue-return filing and e-Tax.
Side-business tax while employed in Japan
When side income needs a return, the ¥200,000 rule’s real meaning, and business vs miscellaneous income.
Direct answers
Employees with side income may need to file even under the often-cited ¥200,000 line, and whether that income is business or miscellaneous turns mainly on whether you run it like a business and keep books.
Key points
- The ¥200,000 figure is a filing-obligation rule for some employees, not a tax-free allowance.
- Even under it, a resident-tax declaration to your municipality can still be required.
- Business vs miscellaneous income hinges on business-like activity and bookkeeping.
- Business income unlocks the blue return and loss offset; miscellaneous income does not.
Do you even need to file?
A widely repeated rule says employees need not file an income-tax return if their side income is ¥200,000 or less. It is real but narrow: it concerns the national income-tax filing obligation for certain employees whose main job is settled by year-end adjustment, and it is not a tax-free allowance. Even when it applies, your municipality may still require a separate resident-tax declaration on that income — so “under ¥200,000, do nothing” is often wrong.
If your side income is larger, or you have two employers, or you want to claim deductions like medical expenses or a first-year mortgage credit, you file a 確定申告 that includes the side income. When in doubt, filing is the safe default; the resident-tax side in particular is easy to overlook.
Business income or miscellaneous income?
How side income is categorized matters a lot. Business income (事業所得) can use the blue return, its up-to-¥650,000 deduction, and loss offset against other income; miscellaneous income (雑所得) cannot. Following the NTA’s clarification, the deciding factor is whether the activity is run as a business by social norms — continuity, scale, effort, and above all keeping proper books and evidence. Records generally point to business income; their absence, or very small casual revenue, points to miscellaneous.
So if you intend your side work to be a real business, treat it like one from the start: file the opening notification and blue-return application, keep double-entry books in accounting software, and retain contracts and receipts. That both supports business-income treatment and prepares you to go fully independent later.
Who this is for
- Employees with a growing side income
- Anyone deciding whether to register a side business
What this is not
- Investment-income filing specifics
- Cases with overseas income
Important cautions
- The ¥200,000 rule and income classification are frequently misunderstood — confirm your own obligation with the NTA or a 税理士.
Related products & services
Money Forward Cloud
マネーフォワード クラウドCloud accounting software · Money Forward
- Fees
- Varies
- English
- No
Cloud accounting with strong automation and integrations, popular with freelancers and small companies that value flexible bookkeeping.
Frequently asked questions
Do I need to file taxes on a side business while employed in Japan?
Possibly, even under the often-cited ¥200,000 line. That figure is a national income-tax filing-obligation rule for certain employees settled by year-end adjustment — not a tax-free allowance — and a separate resident-tax declaration to your municipality can still be required. Whether the income is business income (which unlocks the blue return and loss offset) or miscellaneous income depends mainly on running the activity like a business and keeping proper books. If you intend it to be a real business, file the opening notification and keep double-entry records from the start.
How do I register as a freelancer (sole proprietor) in Japan?
File a notification of business opening (開業届) with your local tax office within about a month of starting — it is free and short. At the same time, file the blue-return application (青色申告承認申請書) to unlock the up-to-¥650,000 deduction. You keep your existing visa status if it permits the work; some visa types need permission for self-employment, so check your residence status first.