Taxes on employee side income
Freelancing, creator and platform income, expenses, the ¥200,000 rule, and resident-tax reporting.
A salaried employee generally files a return when side income after expenses exceeds ¥200,000; below that, national filing may not be required but a resident-tax declaration usually is — and the correct income category decides your expenses and losses.
Effective: 2026-01-01 to 2026-12-31
Professional review pending — treat as draft and confirm with the authorities.
Key points
- The test is income after expenses, not revenue.
- Above ¥200,000 you file a national return; below, usually a resident-tax declaration.
- Category (business vs miscellaneous) sets your expenses and loss rules.
- Platform income is taxable when earned, not only when withdrawn.
The ¥200,000 test
Deduct directly related expenses from your side revenue; if the result exceeds ¥200,000, file a national return. A worked example: ¥300,000 of affiliate revenue minus ¥80,000 of platform and advertising cost is ¥220,000 — over the line. Even under ¥200,000, your municipality generally still expects a resident-tax declaration of that income.
Category and your employer
Whether your side activity is business or miscellaneous income depends on its continuity, scale, and records — and it decides whether losses can offset salary (business) or not (miscellaneous). If you worry about your employer learning of a side job, note that resident-tax collection method choices are municipal and confidentiality cannot be guaranteed; a growing, organized side activity is better handled deliberately as business income.
Who this is for
- Employees with a side gig
- Creators and platform sellers
What this is not
- Full-time freelancers
- The ¥200,000 relief is national only — do not skip the resident-tax declaration.
Frequently asked questions
Do I need to file a tax return in Japan?
Many employees do not, because tax is settled by year-end adjustment (年末調整). You generally must file (確定申告) if you have side income over ¥200,000, two or more employers, self-employment income, sizeable investment or crypto gains, or you want to claim deductions like large medical costs or a first-year mortgage credit. Filing season is Feb 16 – Mar 15 via e-Tax. When unsure, check the NTA guidance or ask a 税理士.