For most employees Japan's taxes run on autopilot — income tax is withheld each month and reconciled by the company in December, no filing needed. The trap is residence tax, charged on last year's income starting the following June, which makes year one feel artificially cheap and year two bring a bill many newcomers never budgeted. Freelancers, double-jobbers, and anyone with side income over ¥200,000 must file a return each spring, and unpaid residence tax follows you into visa renewals and out the departure gate.
Key facts
- Income tax (national)
- Progressive 5–45%, withheld monthly
- Residence tax (local)
- ~10% of last year's income, from June
- Year-end adjustment
- Employer files for most employees
- Must file a return
- Freelance, 2+ jobs, side income >¥200,000
- Filing season
- Mid-February to mid-March
The autopilot part
If you’re a regular employee, two systems run without you: monthly withholding takes an estimated income tax from each paycheck, and the December year-end adjustment (nenmatsu chōsei) reconciles it — most employees in Japan never file a return in their lives. Keep the gensen chōshūhyō slip your company issues each January; immigration asks for it at visa renewals, and it’s the document that proves your income exists.
The part nobody warns you about
Residence tax is the newcomer’s ambush: roughly 10% of your income, but charged a year in arrears, starting the June after you earned it. Year one in Japan feels light because you’re paying residence tax on a year in which you earned nothing here. Year two, the real rate arrives — and it also explains why part-time students who scale back hours suddenly owe tax that chases last year’s busier schedule. The bill survives job changes and even emigration, which is why leavers appoint a tax agent to settle it.
Who has to file, and who should anyway
A spring tax return (kakutei shinkoku, mid-February to mid-March) is mandatory for freelancers, people with two employers, and anyone with over ¥200,000 of side income — including undeclared delivery-app or resale earnings, which tax offices increasingly cross-check. Filing is voluntary but profitable when you have big medical bills, home-loan credit, or donations to claim. And the quiet thread through all of it: tax payment certificates sit next to pension records in the permanent residency file — the cheapest PR strategy is simply a clean payment history.
Common mistakes & warnings
- Budget for the second-year shock — residence tax on your first year's income lands from June of year two, roughly one month's pay spread over the year. It hits hardest when income drops, since the bill chases last year's higher earnings.
- Quitting a job doesn't cancel residence tax — the remaining installments on last year's income are still due, often collected as a lump sum from your final paycheck.
- If you leave Japan mid-year, appoint a tax agent (nōzei kanrinin) before departure — residence tax billed after you're gone doesn't vanish, and unpaid tax surfaces at any future visa application.
Frequently asked questions
My company handles everything — do I ever need to file?
If you have one employer and under ¥200,000 in side income, the December year-end adjustment closes your year and you never see a tax office. File anyway when you want deductions the company can't claim — medical expenses over ¥100,000, first-year home-loan credit, or donations.
Why was my first year so cheap?
Because residence tax is charged on the previous year's Japanese income, and yours was zero. The ~10% catches up from June of your second year — it's not a raise disappearing, it's the real tax rate arriving.
Do foreign students pay tax on part-time income?
Below about ¥1.03 million a year, income tax is effectively zero anyway. Some students benefit from tax-treaty exemptions — China's treaty famously exempts students' part-time wages — but the paperwork must be filed through the employer to apply.
Official sources
- National Tax Agency — guide for foreign residents (2026-07-17)
This page provides general information only and is not legal advice. Immigration rules change; always confirm details with the official sources listed above before making decisions.