Do you actually have to file a Japan tax return? A foreigner's must-file checklist

Japan quietly finishes most employees' taxes for them through the year-end adjustment (nenmatsu chōsei) — so a huge number of foreigners never touch a tax return and that's correct. But a few common situations flip you from "nothing to do" into "legally required to file," and a few others mean you should file to get money back. Mio doesn't guess; Mio checks the trigger. Here's the exact map.

First: are you even taxed on it? (resident type)

Before "must I file," the NTA sorts you by residency status, which decides what income is in scope:

• Non-permanent resident — you have a home (jūsho) or residence in Japan but have had one for an aggregate of 5 years or less within the past 10 years. You're taxed on Japan-source income plus foreign-source income that is paid in Japan or remitted to Japan.
• Permanent resident (for tax) — over that 5-in-10-years line. Taxed on your worldwide income, including overseas income even if it never enters Japan.
• Non-resident — no domicile and not resident for a year. Taxed only on Japan-source income.

Who MUST file — the mandatory triggers

Per the NTA's rules for wage earners, you are required to file a final tax return if any of these apply:

• Your total employment income exceeds ¥20,000,000.
• You have one employer and your total other income (excluding employment and retirement income) exceeds ¥200,000 — side business, freelance, crypto, investment gains not settled at source, rent, or salary from your home country.
• You have two or more employers (all withheld) and the sum of your secondary salaries plus other income exceeds ¥200,000.
• You received salary from someone not obliged to withhold Japanese tax at source (e.g. a foreign employer paying you directly).
• You're a company director/relative receiving interest or rent from that family company, or your withholding was postponed under the Disaster Exemption Act.

Broadly, the self-employed and business owners file under the general rule: if your income after deductions leaves tax owing, you file — there's no year-end adjustment to finish it for you.

Who can SKIP filing

You generally do not need to file if you're a wage earner whose employer completed your year-end adjustment, your salary is ¥20,000,000 or less, and your other income is ¥200,000 or less (with tax properly withheld). The NTA states the calculation and payment are then completed through the year-end adjustment. Similarly, many pension recipients with public pension of ≤¥4,000,000 and other income ≤¥200,000 are off the hook.

Careful: the ¥200,000 "no need to file" relief is an income-tax rule. Even if you skip the national filing, that side income can still be reportable for resident tax to your city — the ¥200,000 exemption doesn't automatically carry over. See Japan's resident tax explained →.

Who SHOULD file — to get money back

Filing is often optional but worth it. You can file a return to claim a refund of over-withheld tax if you:

• Left a job or left Japan mid-year and never got a year-end adjustment — too much tax was likely withheld on an annualised assumption.
• Had large medical expenses (medical expense deduction) — see the medical expense deduction →.
• Did furusato nozei with 6+ municipalities or without one-stop — see furusato nozei for foreign residents →.
• Paid deductible social insurance, iDeCo, life insurance, or a housing loan not captured at year-end.

Quick verdict table

Illustrative only. Thresholds, treaty relief, and resident-tax rules vary by case and year — the NTA and your local tax office are the authority for your exact obligation.

Related reading: Year-end adjustment vs tax return →, Filing a final tax return when leaving Japan →, and Double taxation on remote/overseas income →.