How taxes work in Japan
National vs local tax, calendar-year taxation, withholding, year-end adjustment, and the delayed resident-tax bill.
Japan runs two parallel systems: national income tax (withheld and often settled by an employer year-end adjustment) and local resident tax billed the year after you earn — with a final tax return reconciling anything withholding did not cover.
Effective: 2026-01-01 to 2026-12-31
Professional review pending — treat as draft and confirm with the authorities.
Key points
- National taxes fund the central government; local (resident) taxes fund your prefecture and municipality.
- The income-tax year is the calendar year, January 1 to December 31.
- Employers withhold income tax during the year; withholding is a prepayment, not the final bill.
- Resident tax (~10%) is assessed on the previous year’s income and collected from June the following year.
- A ¥300,000 income deduction cuts taxable income, not tax — the saving is roughly your marginal rate times the deduction.
National tax and local tax
Two separate authorities tax your income. National income tax (所得税) is administered by the National Tax Agency and is progressive. Local resident tax (住民税) is administered by your municipality and prefecture; the income portion is generally about 10% — in Tokyo, 4% prefectural plus 6% municipal — with fixed per-capita amounts and the national forest-environment tax collected alongside it. A Special Income Tax for Reconstruction equal to 2.1% of your calculated national income tax applies through 2037.
Withholding and year-end adjustment
Employers, pension payers, and some business customers withhold tax as you are paid. Because the withheld amount rarely equals your exact annual liability, an employer performs a year-end adjustment (年末調整) that reconciles most employees’ national income tax. A refund at that point simply means too much was prepaid — it does not mean the income was untaxed.
Why the resident-tax bill arrives late
Resident tax is assessed on the previous calendar year’s income and collected from June of the following year through the next May. New arrivals often owe little in year one and get a surprise bill in year two; people who leave Japan can still owe resident tax based on the year before departure. Budget for this timing gap.
Who this is for
- Anyone new to the Japanese tax system
- Employees wanting to understand their payslip
What this is not
- Detailed cross-border or business-structuring advice
- 2025–2026 reforms changed several thresholds; use the NTA calculator or current-year software rather than a prior-year spreadsheet.
Frequently asked questions
Why did I get a big resident tax bill in my second year?
Resident tax (住民税, about 10%) is charged the year after the income is earned, based on the previous year’s income. So in your first year you often pay little, and in your second year you get a bill for your full first-year income. The same lag means people who stop working or leave Japan can still owe resident tax afterward. Budget for it in advance.
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.