Claiming Overseas Dependents on Japan Taxes (国外扶養控除)

Quick Answer: If you live in Japan and financially support family who live abroad, you may be able to claim them as dependents and lower your Japanese income and resident tax. The deduction is ¥380,000 per qualifying dependent (¥480,000 for one aged 70+). You must prove the family relationship and your remittances, and for relatives aged 30–69 you generally must have sent them at least ¥380,000 that year. It's claimed through year-end adjustment or a final tax return — and many foreigners never claim it.

If you earn in Japan but send money to parents, a spouse, or children living in another country, Japan's tax system has a deduction built for exactly that — the dependent deduction for relatives living overseas (国外扶養控除). Used correctly, it can meaningfully cut your tax bill. Used carelessly, the claim gets rejected for missing paperwork. Most foreigners never claim it at all.

This guide explains who qualifies, how much it's worth, and the documents you actually need.

This is educational information, not tax advice. The rules are detailed and were tightened in 2023 — confirm specifics with the National Tax Agency (NTA) or a qualified tax professional (税理士).

What is the overseas dependent deduction?

Japan's dependent deduction (扶養控除) lets a taxpayer reduce their taxable income for each qualifying dependent relative they support. Crucially, the relative does not have to live in Japan — if you support family abroad, they can count, provided you can document the relationship and your financial support.

It applies to your income tax and your resident tax, so the benefit shows up twice.

How much can it save you?

The deduction amount per qualifying dependent:

Remember this is a deduction from taxable income, not a cash refund. Your actual saving is roughly the deduction × your marginal tax rate (income tax + ~10% resident tax). For many earners, a ¥380,000 deduction translates to somewhere around ¥57,000–¥115,000 in combined tax saved per dependent, depending on your bracket — and you can claim more than one dependent.

Who counts as an overseas dependent?

To qualify, the relative must:

They don't need to live with you, but you must genuinely support them.

The documents you need (this is where claims fail)

Since January 2023 the NTA tightened the rules for overseas relatives. You generally must provide two things:

  1. Proof of relationship (親族関係書類) — e.g. a copy of the relative's passport plus an official document (birth certificate, family register, or government-issued record) showing their name, date of birth, and address.
  2. Proof of remittance (送金関係書類) — bank transfer records or money-transfer-service receipts showing you actually sent them money that year.

The requirements then depend on the dependent's age:

The remittance rules people get wrong

This trips people up, so be precise:

How to claim it, step by step

  1. Confirm eligibility — relationship, the dependent's low income, your genuine support, and the age-based remittance test above.
  2. Gather your documents — relationship proof + remittance proof for each dependent (with Japanese translations if the originals are in another language).
  3. Submit the claim — either through your employer's year-end adjustment (年末調整) by handing in the dependent forms and documents, or by filing a final tax return (確定申告) yourself.
  4. Keep copies in case the tax office asks to verify.

If you support family abroad and remit regularly, this pairs naturally with understanding the true cost of those transfers — see how remittance pushes back your FI date and the wider FIRE in Japan: NISA, currency & retirement guide.

How this fits your bigger plan

Supporting family overseas is one of the biggest, most overlooked variables in a cross-border FI plan. This deduction won't change the fact that you're sending money — but it lowers the tax you pay while doing it, which lifts your effective savings rate. The same "keep more of what you earn" logic runs through the medical expense deduction and your NISA and iDeCo accounts.

Use the free Japan Salary Tax Calculator to estimate your net pay, and the PlanTogetherFI calculator to see how a higher savings rate moves your timeline.

PlanTogetherFI is for educational planning only. It is not financial, tax, legal, or investment advice. The overseas dependent deduction has detailed documentation rules — confirm your eligibility and required documents with the NTA or a qualified tax professional.

Frequently Asked Questions

Can I really lower my Japanese taxes by supporting family abroad?

Yes. If you financially support qualifying relatives who live overseas, you can claim them as dependents and reduce your income and resident tax — provided you can document the relationship and your remittances. Many foreign residents are eligible but never claim it.

How much is the deduction worth?

¥380,000 per general dependent, or ¥480,000 for a dependent aged 70 or older. It reduces taxable income, so your actual saving is that amount multiplied by your tax rate (income tax plus roughly 10% resident tax). You can claim more than one dependent.

What documents do I need for an overseas dependent?

Two kinds: proof of the family relationship (passport plus an official record of name, birth date, and address) and proof of remittance (bank or transfer-service records). For relatives aged 30–69, you generally also need to show you sent at least ¥380,000 that year, unless they are a student abroad or have a disability.

Can I claim both of my parents overseas?

Yes, but each parent must individually meet the rules — including receiving money in their own name, and (if aged 30–69) each reaching the ¥380,000 remittance threshold. Separate records per person are essential.

How do I actually claim it?

Through your employer's year-end adjustment (年末調整) by submitting the dependent forms and supporting documents, or by filing a final tax return (確定申告). Keep copies of everything in case the tax office requests verification.

Sources and further reading

Figures reflect rules current for 2025–2026 and may change. Always confirm your eligibility and required documents with the NTA or a qualified tax professional.