Inheritance for People with Disabilities in Japan

Why Inheritance Planning Matters

Leaving money or property to a person with a disability is not as straightforward as it might seem. Without planning, an inheritance that was meant to provide security could instead create problems for your loved one in the future.

Japan’s legal and tax systems include specific protections and advantages for heirs with disabilities. But they only work if you plan ahead. This article is based on the information my husband and I received after consultations and additional research. It explains how inheritance works in Japan, what special rules apply when an heir has a disability, and the tools available to make sure your assets reach your child safely and are managed well. Please consult a lawyer for advice that pertains to your specific situation.

How Inheritance Works in Japan: The Basics

Statutory Shares (Houtei Souzoku Bun / 法定相続分)

Under Japanese law, when a person dies without a will, their estate is divided according to statutory shares (houtei souzoku bun / 法定相続分). The division depends on who the surviving heirs are:

• Spouse and children: The spouse receives half, and the children divide the other half equally.
• Spouse and parents (no children): The spouse receives two-thirds, and the parents divide one-third.
• Spouse and siblings (no children, no parents): The spouse receives three-quarters, and the siblings divide one-quarter.

If there is no spouse, the children (or next eligible heirs) divide the entire estate equally.

This statutory division does not take into account whether one child has a disability and needs more financial support than another. Without a will, the child with a disability receives the same share as any other child, regardless of their needs.

The Basic Inheritance Tax Exemption

Japan’s inheritance tax has a basic exemption that shields smaller estates from taxation. The exemption increases with the number of legal heirs. Many estates, particularly those of moderate size, fall entirely within this exemption and owe no inheritance tax at all.

For the current exemption formula and rates: NTA: Inheritance Tax Calculation (No.4152)

The Disability Deduction for Inheritance Tax

Shougaisha no Zeigaku Koujyo / 障害者の税額控除

How It Works

The deduction is calculated based on the heir’s age at the time of the inheritance, measured against age 85. The formula is:

(85 minus the heir’s age at inheritance) multiplied by a set amount per year

The per-year amount depends on the level of disability:

• General disability (ippan shougaisha / 一般障害者): The deduction is calculated at a lower per-year rate.
• Special (severe) disability (tokubetsu shougaisha / 特別障害者): The deduction is calculated at double the general rate. This category includes physical disability handbook grade 1 or 2, intellectual disability handbook grade A (or equivalent), and mental health handbook grade 1.

Because the formula counts every year from the heir’s current age until 85, the younger the heir is at the time of inheritance, the larger the deduction. For a person with a severe disability who inherits in their 20s, the deduction can reach into the tens of millions of yen. This is an enormous tax advantage that many families do not know about.

If the heir’s age includes months (for example, 25 years and 4 months), the partial year is rounded up to the next full year, making the deduction slightly larger.

For the current per-year amounts and full eligibility details: NTA: Disability Tax Credit for Inheritance Tax (No.4167)

Who Qualifies for This Deduction?

To receive the disability deduction for inheritance tax, the heir must meet all of the following requirements:

• The person received property through inheritance or bequest.
• The person is a legal heir (souzoku nin / 相続人), not just someone named in the will who is not an heir.
• The person is a resident of Japan at the time of the inheritance.
• The person is under age 85 at the time of the inheritance.
• The person is recognized as having a general disability or a special (severe) disability under tax law.

The Excess Can Be Used by Family Members

This is a detail that makes the deduction even more valuable. If the disability deduction exceeds the disabled heir’s own inheritance tax liability (meaning their share of tax is already zero and there is still deduction remaining), the excess amount can be applied to reduce the inheritance tax owed by other heirs who are the person’s fuyou gimusha (扶養義務者), or support obligors. Support obligors include the spouse, parents, children, siblings, and certain other close relatives.

In practical terms, this means the disability deduction can reduce the entire family’s inheritance tax bill, not just the disabled heir’s portion. This is a significant benefit that should be factored into estate planning.

If Your Child Inherits Twice

If your child with a disability inherits from both parents (for example, from the father first, and then later from the mother), the disability deduction applies to both inheritances. However, the second time, the deduction is reduced by the amount that was already used in the first inheritance.

The formula for the second inheritance becomes: either the standard calculation (85 minus age at second inheritance, multiplied by the per-year amount), or the original full deduction (85 minus age at first inheritance, multiplied by the per-year amount) minus the amount actually used in the first inheritance, whichever is less.

This means it is worth keeping careful records of the deduction amount used in the first inheritance, so the second calculation can be done correctly. Even if the first inheritance resulted in zero tax (because the deduction eliminated it), the amount of deduction that was available should be documented for future reference.

The Mutual Aid Pension Is Tax-Free

If your family uses the shinshin shougaisha fuyou kyousai seido (心身障害者扶養共済制度), the mutual aid insurance system (see our article “Disability Pensions, Allowances, and the Mutual Aid System”), the tax treatment is exceptionally favorable:

• No inheritance or gift tax: When the parent dies and the person with a disability inherits the right to receive the mutual aid pension, no inheritance tax or gift tax applies to that right.
• No income tax on the payments: The monthly pension payments the person receives from the mutual aid system are completely exempt from income tax.

This makes the mutual aid system one of the most tax-efficient ways to transfer ongoing financial support to a person with a disability after the parent’s death.

Source: NTA: Disability and Tax (障害者と税)

Why a Will Matters

For families with a child with a disability, dying without a will (yuigon / 遺言) is one of the worst things that can happen. Here is why:

• Equal shares may not be fair. The statutory division gives every child an equal share. But a child with a disability may need significantly more financial support over their lifetime than a sibling who works and earns independently. A will lets you allocate a larger share to the child who needs it most.
• Control over how assets are managed. A will can specify not just who receives what, but how it should be managed. You can direct that your child’s share be placed into a trust or managed by a guardian, rather than handed to them directly.
• Designation of the executor. A will lets you choose who handles the estate administration (yuigon shikkou sha / 遺言執行者). Without a will, all heirs must agree, which can be complicated.
• Preventing disputes. Inheritance disputes among family members are painful and common. A clear will reduces the risk of conflict, especially when one child’s share is different from the others.

Types of Wills in Japan

There are three main types of wills recognized under Japanese law:

• Jihitsu Shoushoo Yuigon (自筆証書遺言) / Handwritten Will: The testator writes the entire will by hand, dates it, and seals or signs it. The property list (zaisan mokuroku / 財産目録) can be typed or printed. This is the simplest and least expensive option but must follow strict format rules to be valid.
• Koushou Yuigon (公正証書遺言) / Notarized Will: The testator dictates the will to a notary public (koushounin / 公証人) at a notary office (koushou yakuba / 公証役場), with two witnesses present. This is the most reliable option because it is professionally prepared and stored at the notary office, reducing the risk of loss, tampering, or invalidity.
• Himitsu Shoushoo Yuigon (秘密証書遺言) / Secret Will: The testator prepares the will (which can be typed), seals it in an envelope, and presents it to a notary with two witnesses. The content remains secret until death. This is less common.

For families with significant assets or complex situations, the notarized will is strongly recommended. The cost is relatively modest and the notary office stores the original, preventing loss.

For will requirements: MOJ: Wills and Inheritance

Risks of Unprotected Inheritance

Leaving a large sum of money or property directly to a person with a disability without any management structure in place carries real risks:

• Financial mismanagement: A person with an intellectual disability may not understand how to manage a large sum. Without oversight, the money could be spent quickly or unwisely.
• Exploitation and scams: People with disabilities are disproportionately targeted by financial scams, unwanted sales, and exploitation. A large, visible inheritance makes them a target.
• Loss of control: Once the inheritance is given directly, there is no mechanism to ensure it is used for the person’s well-being. Without a guardian or trust, no one has legal authority to manage it.
• Family conflict: If a sibling or other family member manages the money informally (without legal authority), this can lead to disputes, accusations, and broken relationships.

Tools for Safe Inheritance

Japan offers several legal tools that can protect an inheritance and ensure it benefits the person with the disability over the long term.

1. Guardianship

If a guardian (seinen koukenin / 成年後見人) is in place, the guardian manages the person’s finances, including any inherited assets. This provides legal accountability and court oversight. See our article “Adult Guardianship in Japan” for details.

2. The Special Needs Trust (Tokutei Zouyo Shintaku / 特定贈与信託)

Rather than leaving assets directly, you can place them into a special needs trust managed by a professional trust bank. The trust makes regular payments for the person’s living expenses and medical care for their entire lifetime. This removes the burden of management from the family and provides professional oversight. The trust also offers significant gift tax exemptions. See our article “Special Needs Trusts in Japan” for the full explanation.

3. Testamentary Trust (Yuigon Shintaku / 遺言信託)

You can specify in your will that your child’s share of the inheritance should be placed into a trust managed by a trust bank, rather than given directly. This is called a yuigon shintaku (遺言信託), a testamentary trust. The trust bank manages the assets and makes payments to or for the benefit of the person with the disability according to the terms you set in the will.

This is different from the tokutei zouyo shintaku (which is set up during your lifetime). The testamentary trust takes effect after your death and is governed by the terms of your will.

4. The Guardianship Support Trust (Kouken Seido Shien Shintaku / 後見制度支援信託)

If a guardian is in place, the family court can direct that the person’s large assets (including inherited assets) be placed in a trust at a trust bank. The trust protects the assets from misuse: the guardian handles day-to-day finances, but the bulk of the assets can only be accessed with the family court’s permission through an official instruction document (shiji sho / 指示書). This adds a layer of security within the guardianship system.

5. Assigning a Larger Share in the Will

You can leave a larger share of your estate to your child with a disability through your will. However, be aware of Japan’s iryuubun (遺留分), the legally reserved share. Under Japanese law, certain heirs (children, the spouse) are guaranteed a minimum share of the estate regardless of what the will says. You cannot completely disinherit them. The reserved share is typically half of what the statutory share would have been.

This means that if you have two children, you cannot leave everything to the child with the disability and nothing to the sibling. The sibling has a legal right to claim their reserved share. Planning within these constraints is important.

Siblings and Inheritance

If you have more than one child, inheritance planning becomes a conversation about fairness. Your child with a disability may need the money more, but your other children have their own needs and their own legal rights.

Some approaches families use:

• A larger share to the child with the disability, explained in writing. Many families leave a larger portion to the child with the disability and include a letter (or a note in the will) explaining the reasoning. When siblings understand why the division is unequal, they are more likely to accept it.
• Assets to the child with the disability through a trust; other assets to siblings directly. This separates the management question from the fairness question. The child with the disability receives their share through a professionally managed trust, while siblings receive theirs directly.
• Asking a sibling to serve as guardian or key person, with compensation. If a sibling will take on the role of guardian or ongoing support person, building compensation into the estate plan acknowledges the time and effort they will invest.
• Having the conversation now. The most important thing is to talk about it openly. Siblings who are surprised by an unequal inheritance after a parent’s death are far more likely to feel resentful than siblings who were part of the conversation.

Gift vs. Inheritance

You do not have to wait until you die to transfer assets to your child. You can give during your lifetime through gifts. Japan’s gift tax system and the special needs trust provide tools for this:

• The tokutei zouyo shintaku (special needs trust) allows tax-exempt gifts to be placed in trust during your lifetime. See our article “Special Needs Trusts in Japan.”
• Annual gifts below the gift tax exemption threshold can be made without tax consequences.
• Gifts of living expenses and educational costs are generally not subject to gift tax if used for their intended purpose.

The advantage of giving during your lifetime is that you can see the structure working and make adjustments. The advantage of inheritance is that you retain control of the assets until you need them.

Many families use a combination: placing some assets in a trust during their lifetime and leaving additional assets through a will.

Practical Tips

• Write a will. This is the single most important inheritance planning step. Without it, your assets will be divided according to statutory shares regardless of your child’s needs.
• Use a notarized will (koushou yuigon) for the strongest legal protection. The cost is modest and the notary office stores the original, preventing loss.
• Consider a trust for your child’s share. Whether through a tokutei zouyo shintaku during your lifetime or a testamentary trust in your will, professional management protects the assets and your child.
• Talk to your other children about your plans. Open communication prevents surprise, resentment, and legal disputes.
• Make sure the disability deduction is claimed. It must be included in the inheritance tax return. Make sure whoever handles the estate administration knows about it and claims it correctly.
• Keep records of the first inheritance deduction. If your child will inherit from both parents, the amount used in the first inheritance affects the calculation for the second. Document it carefully.
• Consider the mutual aid system. Its complete tax exemption (no inheritance tax, no gift tax, no income tax) makes it one of the most efficient tools for transferring ongoing support to your child after death.
• Consult a professional. A lawyer (bengoshi / 弁護士), judicial scrivener (shihou shoshi / 司法書士), or tax accountant (zeirishi / 税理士) who specializes in inheritance can save your family significant money and prevent costly mistakes.
• For a comprehensive overview of tax provisions for people with disabilities: NTA: Disability and Tax (障害者と税)

Key Terms

Japanese Term	English
Souzoku / 相続	Inheritance
Souzoku zei / 相続税	Inheritance tax
Houtei souzoku bun / 法定相続分	Statutory inheritance share
Shougaisha koujyo / 障害者控除	Disability deduction (inheritance tax)
Tokubetsu shougaisha / 特別障害者	Special (severe) disability
Fuyou gimusha / 扶養義務者	Support obligor (family who can use excess deduction)
Yuigon / 遺言	Will
Koushou yuigon / 公正証書遺言	Notarized will
Yuigon shikkou sha / 遺言執行者	Will executor
Iryuubun / 遺留分	Legally reserved share
Yuigon shintaku / 遺言信託	Testamentary trust
Kouken seido shien shintaku / 後見制度支援信託	Guardianship support trust
Bengoshi / 弁護士	Lawyer
Shihou shoshi / 司法書士	Judicial scrivener
Zeirishi / 税理士	Tax accountant

Useful Resources

NTA: Disability and Tax (障害者と税, comprehensive overview):

https://www.nta.go.jp/publication/pamph/koho/kurashi/html/03_2.htm

NTA: Disability Tax Credit for Inheritance Tax (No.4167, 障害者の税額控除):

https://www.nta.go.jp/taxes/shiraberu/taxanswer/sozoku/4167.htm

NTA: Inheritance Tax Calculation (No.4152, 相続税の計算):

https://www.nta.go.jp/taxes/shiraberu/taxanswer/sozoku/4152.htm

NTA: When You Inherit Property (財産を相続したとき):

https://www.nta.go.jp/publication/pamph/koho/kurashi/html/05_5.htm

NTA: Gift Tax Exemptions for Persons with Disabilities (No.4405):

https://www.nta.go.jp/taxes/shiraberu/taxanswer/zoyo/4405.htm

MOJ: Wills and Inheritance (相続・遺言): https://www.moj.go.jp/MINJI/minji07_00015.html