Year-End Tax Adjustment (Nenmatsu Chosei) 2026 in Japan: 380,000-Yen Overseas Dependent Rule

Between late October and mid-November each year, HR departments at Japanese companies distribute paperwork or software links for the annual Year-End Tax Adjustment (年末調整 – Nenmatsu Chosei).

Failing to complete this filing properly can result in forfeiting substantial tax refunds (typically 30,000 to over 100,000 yen) in your December paycheck, while triggering higher local residence taxes (*Juminzei*) throughout the following year.

In 2026, Japan’s National Tax Agency (NTA) continues strict enforcement of remittance criteria for non-resident overseas dependents. Here is a clear breakdown of the essential 380,000-yen threshold, mandatory documentation, and realistic refund calculations.

What Is Nenmatsu Chosei and Why Is It Vital?

Throughout the year, your employer automatically withholds estimated income tax (*Shotokuzei*) from your monthly salary. However, this estimated withholding does not account for all personal deductions (such as overseas dependents, private life insurance premiums, iDeCo pension contributions, etc.).

Nenmatsu Chosei reconciles your actual tax liability:

• If excess tax was withheld throughout the year, the overpaid balance is refunded directly into your December paycheck.
• It finalizes your taxable income for the municipal office (*Yakusho*), which calculates your local residence taxes (*Juminzei*) starting the following June.

The Strict 380,000-Yen Rule for Dependents Aged 30 to 69

Under tax regulations for non-resident relatives residing abroad, if you claim a relative aged 30 to 69 (such as parents, siblings, or spouse):

They must meet AT LEAST ONE of the following three conditions:

1. Be enrolled as a full-time international student abroad.
2. Have a certified disability.
3. Receive at least 380,000 yen in living support remittances from you during the tax year.

If a dependent aged 30 to 69 receives less than 380,000 yen during the year (for example, 300,000 yen), the deduction will be completely disqualified by the tax office.

Age Exemption Notes: – Relatives aged 16 to 29: exempt from the 380,000-yen minimum, provided valid living support remittances are proven. – Elderly relatives aged 70 and older: exempt from the 380,000-yen minimum; higher deductions (up to 480,000 – 580,000 yen) apply.

The Two Mandatory Documents You Must Submit

1. Proof of Family Relationship (親族関係書類)

• Official birth certificate (for parents/children) or marriage certificate (for spouses).
• Must be accompanied by a Japanese translation (including the translator’s name and signature).

2. Proof of International Remittances (送金関係書類)

• Official Remittance Certificate issued by a licensed international money transfer service (SBI Remit, DCOM, Smiles, Western Union, etc.).
• CRITICAL REQUIREMENT: Remittances must be sent individually in the dependent’s exact legal name.
  • If you claim both father and mother, you must send two distinct transfers: at least 380,000 yen to the father and at least 380,000 yen to the mother.
  • Sending a single lump sum to one parent to cover both will result in the tax office granting the deduction for only one person. Hand-carried cash has no legal validity.

Financial Impact: How Much Money Do You Actually Save?

For an individual earning an annual gross salary of approximately 4,000,000 yen (tax bracket ~10% income tax and 10% residence tax):

Registering 1 qualified dependent (380,000 yen deduction):

• Income tax refund in December: 380,000 × 10% = 38,000 yen.
• Residence tax reduction next year: 330,000 × 10% = 33,000 yen.
• Total annual cash savings: approx. 71,000 yen per dependent.
• Claiming two parents saves nearly 140,000 to 150,000 yen per year in total tax relief.

Action Checklist

1. Verify Year-to-Date Remittances: Check your transfer apps to confirm total remittances have reached at least 380,000 yen per claimed adult dependent before year-end.
2. Request Official Remittance Certificates: Download the annual certificates (*Sōkin Shōmeisho*) from your provider.
3. Prepare Relationship Proof & Translations: Scan documents for online HR submission portals.

References

• National Tax Agency (NTA): Handbook on Year-End Tax Adjustments 2026.
• National Tax Agency (NTA): Guidelines on Dependent Deductions for Non-Resident Relatives.
• Official Forms: Application for Exemption for Dependents of Employment Income Earner.