Answer a few questions about your 2026 situation and see whether you likely must file a 確定申告 (kakutei shinkoku) — and whether filing would get you money back. In plain English.
General reference only — not professional advice. This tool encodes common 国税庁 (National Tax Agency) rules to give a likely answer; it can't model every exception. A full disclaimer appears with your result.
1. Your residency this year
Living in Japan (1+ years)A resident (居住者) for the full tax year.
Arrived in Japan this yearStarted living here partway through the year.
Leaving Japan this yearDeparting partway through the year.
2. Your main income
One employer, year-end adjusted (年末調整)A single job whose tax your employer settles via 年末調整.
Two or more employersSalary from more than one place.
Freelance / self-employed / business事業所得 or freelance 雑所得 — no employer settling your tax.
No employment incomeLiving on savings, investments, remittances, etc.
3. Income beyond your main job (side jobs, crypto, one-off gains…)
None
Under ¥200,000
Over ¥200,000
4. Is your gross salary over ¥20,000,000 (2,000万円)?
No
Yes
5. Do any of these apply? (check all that apply)
I did ふるさと納税 to 6+ municipalities, or otherwise can't use one-stop (ワンストップ特例)
My household had high medical expenses (医療費控除) this year
It's my first year claiming a housing loan credit (住宅ローン控除)
I had crypto or stock gains outside a 特定口座（源泉徴収あり）