Dependent Deduction in Japan: Complete Guide for Foreign Residents (2026)

Japan’s dependent deduction (扶養控除 / fuyo kojo) can reduce your taxable income by up to ¥630,000 per qualifying family member — but for foreign residents, the rules around claiming overseas dependents changed dramatically in 2023. If your parents, siblings, or adult children live outside Japan, you now need specific proof that you sent them at least ¥380,000 per year, or the deduction is denied entirely. This guide explains exactly who qualifies, how much you save, and what documents you need for each category of dependent.

Income Walls: How your earnings affect deductions and insurance

1. What Is the Dependent Deduction?

The dependent deduction (扶養控除) is an income deduction that reduces your taxable income — not your tax bill directly — for each qualifying family member you financially support. It is available to all taxpayers in Japan, including foreign residents on any visa type.

Unlike the US system of “claiming dependents” on your tax return, Japan’s system uses a fixed deduction amount per dependent rather than a per-child tax credit. The deduction lowers your taxable income, which in turn reduces both your income tax (国税) and resident tax (住民税).

How Much Does It Save You?

The actual tax savings depend on your marginal tax rate:

Additionally, each dependent provides a resident tax deduction (separate amounts, covered in Section 7), saving an additional ~¥33,000–¥45,000 per dependent per year.

2. Who Qualifies as a Dependent?

To qualify as your dependent (扶養親族) for tax purposes, a family member must meet all four of the following conditions:

Who Counts as “Family”?

Japan’s definition is broader than many Western countries:

• Parents and grandparents (lineal ascendants)
• Children and grandchildren (lineal descendants)
• Siblings
• Uncles, aunts, nephews, nieces (within 6th degree)
• In-laws (within 3rd degree — parents-in-law, siblings-in-law)

Note: Your spouse is never classified as a dependent (扶養親族). Spouses have their own separate deduction system (配偶者控除), covered in Section 4.

3. Deduction Amounts by Age Bracket

The deduction amount varies based on the dependent’s age as of December 31 of the tax year:

The “Specific Dependent” Bonus (Ages 19–22)

The ¥630,000 deduction for dependents aged 19–22 is significantly higher than the standard ¥380,000 because this age range typically corresponds to university attendance, when families face heavy educational costs. This is Japan’s way of providing tax relief for parents paying university tuition — a cost that averages ¥500,000–¥1,350,000 per year at national universities and up to ¥4,000,000+ at private universities.

4. Spouse Deduction vs. Spouse Special Deduction

Your spouse cannot be claimed as a “dependent” (扶養親族). Instead, Japan has two separate deduction systems for spouses:

Spouse Deduction (配偶者控除)

Available when your spouse’s total income is ¥480,000 or less (salary of ~¥1,030,000 or less):

Spouse Special Deduction (配偶者特別控除)

When your spouse earns more than ¥480,000 but less than ¥1,330,000 in total income (salary of ~¥1,030,001 to ~¥2,016,000), you can claim a gradually decreasing deduction:

5. Overseas Dependents: The 2023 Rule Change

This is the section most relevant to foreign residents in Japan. Before 2023, claiming overseas family members as dependents was relatively straightforward — and widely abused. The NTA found that some foreign residents were claiming 10+ overseas dependents with minimal documentation, significantly reducing their tax burden.

What Changed in 2023

Starting from the 2023 tax year, overseas dependents aged 30–69 face strict new requirements. They can only be claimed if they fall into one of these categories:

Who Is NOT Affected by the 2023 Rule

The stricter rules apply only to overseas dependents aged 30–69. The following overseas dependents can still be claimed under the old (simpler) rules:

• Under 16: No income tax deduction anyway, but still counts for resident tax threshold
• 16–29: Standard documentation (relationship proof + remittance proof of any amount)
• 70+: Standard documentation (relationship proof + remittance proof of any amount)

6. Required Documents

Whether claiming domestic or overseas dependents, you need documentation. For overseas dependents, the requirements are significantly more stringent.

For Overseas Dependents

Translation Requirements

All foreign-language documents must include a Japanese translation. The translation does not need to be professionally certified — you can translate it yourself — but it must be accurate and include the translator’s name and date.

7. Impact on Resident Tax and NHI Premiums

The dependent deduction affects more than just your income tax:

Resident Tax (住民税)

Resident tax applies its own set of dependent deduction amounts (generally ¥330,000–¥450,000 per dependent, as shown in the table in Section 3). Since resident tax is a flat 10%, each dependent saves you approximately:

• General dependent (16–18, 23–69): ¥330,000 × 10% = ¥33,000 savings
• Specific dependent (19–22): ¥450,000 × 10% = ¥45,000 savings
• Elderly dependent (70+, co-residing): ¥450,000 × 10% = ¥45,000 savings

Non-Taxable Threshold for Resident Tax

Resident tax has a non-taxable threshold (非課税限度額) that increases with each dependent. In most municipalities, the formula is:

Non-taxable threshold = ¥350,000 × (number of dependents + 1) + ¥100,000 + ¥210,000

Example: A taxpayer with 3 dependents is exempt from resident tax if their total income is below ¥350,000 × 4 + ¥310,000 = ¥1,710,000. Without dependents, the threshold would be only ¥450,000–¥500,000.

National Health Insurance (NHI) Premiums

NHI premiums are calculated based on your prior-year income and the number of enrolled household members. The dependent deduction indirectly reduces your NHI premiums because:

• Lower taxable income → lower income-based NHI portion
• If your income falls below certain thresholds (which the dependent deduction helps achieve), you qualify for NHI premium reductions of 20%, 50%, or 70%

For detailed NHI information, see our Japan Health Insurance Guide for Foreigners.

8. Common Mistakes Foreigners Make

Mistake 1: Claiming Overseas Family Without Proper Documentation

The problem: Listing parents and siblings on your year-end adjustment form without providing relationship certificates or remittance receipts. Your employer may process the deduction initially, but the NTA can — and increasingly does — audit and reverse these deductions years later, resulting in back taxes plus penalties.

Mistake 2: Claiming a Spouse as a Dependent

The problem: Writing your spouse’s name in the “dependent” (扶養親族) section instead of the “spouse” (配偶者) section of the tax form. These are completely separate deduction systems. Claiming your spouse as a regular dependent will be rejected.

Mistake 3: Not Claiming Dependents at All

The problem: Many foreign workers, especially those unfamiliar with the Japanese tax system, simply skip the dependent section entirely. If you have qualifying family members (including overseas), you are leaving significant money on the table. A worker in the 20% bracket with 2 general dependents and 1 specific dependent saves approximately ¥228,000 in income tax alone every year.

Mistake 4: Ignoring the Income Threshold for Dependents

The problem: Claiming a family member as a dependent when their income exceeds ¥480,000 (合計所得金額). A common scenario: your spouse starts a part-time job earning ¥1,200,000/year (income of ¥650,000 after employment deduction), but you continue claiming the spouse deduction. This will be caught during reconciliation and result in additional tax assessment.

Mistake 5: Sending Lump-Sum Remittances to One Family Member

The problem: Sending ¥1,000,000 to your mother and expecting that to cover remittance proof for your mother, father, and a sibling. Under the 2023 rules, each dependent aged 30–69 must receive individually documented remittances of ¥380,000+.

9. How to Claim: Year-End Adjustment vs. Tax Return

Option 1: Year-End Adjustment (年末調整)

If you are employed by a Japanese company, the easiest way to claim dependents is through the year-end tax adjustment process in November/December:

1. Fill out the Declaration of Deduction for Dependents (扶養控除等(異動)申告書) — your employer provides this form
2. List each dependent with their name, date of birth, relationship, estimated income, and address
3. Attach documentation for overseas dependents (relationship proof + remittance proof)
4. Submit to your employer by the deadline (usually late November)

For more details on this process, see our Year-End Tax Adjustment Guide.

Option 2: Tax Return (確定申告)

File a tax return if:

• You missed the year-end adjustment deadline
• You need to correct your dependent claims
• You are self-employed or have multiple income sources
• You want to retroactively claim dependents for up to 5 years back

For the full tax return filing process, see our Step-by-Step Tax Filing Guide.

Frequently Asked Questions

Disclaimer: This article is for informational purposes only and does not constitute tax, legal, or financial advice. Tax rules change frequently and individual circumstances vary. Always consult a qualified tax professional (税理士) for advice specific to your situation. Information is current as of March 2026.