Inheritance tax

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Japan has an inheritance tax (相続税, souzokuzei) rather than an estate tax, meaning that it is the heirs who are individually liable for taxes due on assets left behind by a decedent. Given the potential for confusion that results from this focus on heirs and from relevant statutory regulations, executors often rely on the services of scriveners, tax accountants, and lawyers to administer a decedent's estate. All estates receive a basic inheritance-tax deduction, and inheritance taxes themselves are calculated at marginal and progressive rates. Transnational inheritance introduces an additional layer of complexity that can make administering the estate a fraught process in situations involving multiple nationalities and domiciles. The following sections describe important features of the system, but the explanations should not be construed as being definitive.

Statutory heirs and statutory inheritance shares

Central to understanding how the inheritance-tax system works is the concept of a statutory heir, or houtei souzokunin (法定相続人). Any executor must first determine how many statutory heirs exist, calculate the overall inheritance tax liability based on that number, and then, if necessary, file an inheritance-tax return according to the actual distribution of assets (typically this is a unified return, although each heir is responsible for a single portion of the tax and may choose to file an individual return instead). Statutory heirs have the right to abandon their status, but they are always included in calculations regarding the basic inheritance-tax deduction.

Statutory heirs

Statutory heirs always include the surviving spouse. Beyond that, three orders of precedence exist, with individuals in lower categories ineligible once statutory heirs in a higher category have been identified.

  • The first order of precedence includes the decedent's children and any grandchildren (or great-grandchildren) who have been predeceased by the parent who provides a direct link with the decedent.
  • The second order of precedence includes the decedent's parents or, if the parents have died, the decedent's grandparents (or great-grandparents).
  • The third order of precedence includes the decedent's siblings and any nephews or nieces who have been predeceased by the parent directly related to the decedent.

Once the executor has identified all the statutory heirs, the decedent's assets can be apportioned and the inheritance tax calculated. If the decedent has left a will, the will determines the actual division of assets unless it violates rules regarding distributive shares retained by certain statutory heirs (iryuubun 遺留分; see below for an explanation). But if the decedent dies intestate, all of the statutory heirs must reach an agreement concerning the division of the decedent's assets (the resulting document is called an isan bunkatsu kyougisho 遺産分割協議書). In most cases, this agreement reflects the proportions set out in the civil code for statutory inheritance shares, or houtei souzoku-bun (法定相続分). However, statutory inheritance shares are not legally binding, so it is always possible for disputes to arise over the distribution of the decedent's assets when the decedent dies intestate.

The following table illustrates several possibilities resulting from application of the civil code to the distribution of a decedent's assets when there is a surviving spouse:

Statutory inheritance shares
Statutory heirs Statutory share of spouse Statutory share of non-spouse heirs
Spouse only 100% -
Spouse and children ½ ½
Spouse and parents
Spouse and decendent's siblings ¾ ¼

One enterprising Japanese website has actually gone to the trouble of listing 55 possible combinations of statutory inheritance shares. It bears repeating that these statutory inheritance shares are not legally binding requirements. Statutory heirs are in fact free to agree to any distribution they deem appropriate as long as that agreement is unanimous, but the need for consensus means that when disputes do arise, inheritance can turn into a long and stressful process. Composing a will and/or making use of the early-inheritance system can help ensure that inheritance will proceed relatively smoothly, at least at the procedural level.

Posthumously retained distributive shares (iryuubun)

Posthumously retained, or guaranteed, distributive shares only come into play when the decedent has left a will that seems to deprive a statutory heir of fair treatment (statutory heirs, on their own, are expected to come to a unanimous agreement). The "wronged" individual must proactively claim that his or her right to a guaranteed distributive share has been violated, and the legal system takes it from there (the statute of limitations for claiming such distributive shares is 10 years). Given the existence of these legally mandated shares, it is important to bear them in mind when composing a will.

Here is a table listing the most common combinations of distributive shares retained by the decedent's statutory heirs (the maximum proportion of an estate subject to these shares is 50%):

Posthumously retained distributive shares (iryūbun)
Statutory heirs Total proportion of estate reserved for distributive shared Spouse Children Parents
Spouse only ½ ½ - -
Children only ½ - ½ -
Spouse and children ½ ¼ ¼ N/A
Spouse and parents ½ -
Parents only - -


To repeat: posthumously retained distributive shares cannot be negated by a will, but they must be claimed to be received.

Inheritance tax: basic calculations

Once the number of statutory heirs has been determined, the basic inheritance-tax deduction for a decedent's estate is calculated according to the following formula:

  • 30 million yen + (6 million yen x no. of statutory heirs)

If the basic deduction exceeds the value of the estate, no inheritance tax is due and no inheritance-tax return need be filed. Despite what may seem to be the small size of the basic deduction, most estates in Japan in fact fall below the taxable level. But let's say that an intestate decedent has left an estate valued at 96 million yen -- all of which is "visible" to Japanese tax authorities -- and is survived by a spouse and three children. In that case, the basic deduction looks like this:

  • 30 million yen + (6 million yen x 4)
  • Deduction = 54 million yen

The taxable value of the estate is therefore 96 million yen - 54 million yen = 42 million yen. This amount is apportioned to the statutory heirs in accordance with the statutory inheritance share for each heir:

  • Spouse's share = 50% = 21 million yen
  • Children's share = 50% = 21 million yen
  • Each child's share = 7 million yen

Next, the tax for each statutory heir is calculated according to the following tax table, which uses deductions as a way to account for marginal increases in the inheritance-tax rate:

Inheritance tax rates
Amount received as statutory inheritance share Tax rate Deduction
¥10 million and below 10% -
¥30 million and below 15% ¥500,000
¥50 million and below 20% ¥2 million
¥100 million and below 30% ¥7 million
¥200 million and below 40% ¥17 million
¥300 million and below 45% ¥27 million
¥600 million and below 50% ¥42 million
Over ¥600 million 55% ¥72 million

Thus:

  • Tax for spouse: 21 million yen x 15% - 500,000 yen = 2.65 million yen
  • Tax for each child: 7 million yen x 10% = 700,000 yen

The sum of these amounts is the total inheritance tax due, which in this case equals 4.75 million yen.

Finally, the inheritance tax to be paid is apportioned in accordance with the actual distribution of assets among all the beneficiaries. The total tax burden remains the same, but assets can be distributed so as to make use of certain special tax deductions, thereby minimizing current and future inheritance-tax payments. For example, a spousal deduction is available which ensures that a surviving spouse is highly unlikely to be liable for any inheritance tax on any distributed assets. This deduction is currently set at 160 million yen or 50% of the value of the estate, whichever is larger. Thus, in our example, if the heirs agree that the spouse should inherit the entire estate (and assuming that the decedent had not made use of the early-inheritance tax system), the spousal deduction would easily exceed the total tax due and no inheritance tax would need to be paid at all. But if the spouse is very elderly, it's likely that these inherited assets would in the near future be subject to a "secondary" inheritance tax, potentially making such an arrangement less advantageous than transferring some assets immediately to the children in order to lower the taxable value of the spouse's estate (the number of statutory heirs will be lower when the spouse dies, and the value of the estate correspondingly larger, possibly resulting in a higher marginal tax rate). This is where it would definitely pay to obtain advice from a qualified professional.

One last, sometimes unexpected point: beneficiaries who are not spouses or first-degree blood relatives of the decedent (interpreted to include adoptive parents, formally adopted children, and grandchildren who are skipped-generation statutory heirs) have a 20% surcharge tacked on to their individual tax bill after it has been calculated normally. See the National Tax Agency website or this thorough explanation for more information in Japanese about the souzokuzei no ni-wari kasan (相続税の2割加算).

Transnational inheritance

Inheritance becomes more complex when decedents or heirs are "limited taxpayers" as a result of having an overseas domicile, temporary residence in Japan or, in the case of Japanese nationals, extended residence abroad. Such considerations affect the visibility of the decedent's assets to Japanese tax authorities. The basic rules remain the same, but the calculations become more nuanced (they are being passed over here for the time being).

Here is a table that summarizes the various permutations based on nationality and domicile (juusho 住所). The same rules, by the way, hold for both inheritance tax and gift tax :

Transnational inheritance

Note that "home country" law takes precedence over Japanese law regarding the actual distribution of the assets of a decedent who is not a Japanese national. However, Japanese inheritance tax will be assessed according to the number of statutory heirs, their status as unlimited or limited taxpayers, and the visibility of a decedent's assets as indicated by the table above. Seeking advice from a qualified tax professional would seem to be the wisest course of action to take when transnational inheritance is involved.

Inheritance tax, gifts, and the 2023 revised tax code

Major changes to inheritance tax with respect to gifting will take effect on January 1, 2024, assuming that the final law conforms to the current cabinet-approved proposal. Two in particular are worth noting. First, the look-back period for including gifts in the value of a decedent's estate will be extended from three to seven years. This rule applies to statutory heirs, to others named in wills, and to recipients of life-insurance proceeds. To soften the blow, a new 1-million-yen deduction will be applied to gifts that took place more than three years before the decedent's death. For those who have gifted the maximum amount to multiple individuals in the seven years before their death, the result will be a substantial jump in the amount of assets potentially subject to inheritance tax. Because 2024 is the first year the revised tax code applies, 2027 is actually the first year from which gifts from decedents that took place more than three years earlier will be subject to the look-back. The seven-year look-back will therefore be fully in place from January 2031.

The second major change concerns the early-inheritance tax system, which allows parents or grandparents to gift a tax-free total of up to 25 million yen to children or grandchildren, with the understanding that the value of the gift(s) be included in the donor's estate at the time of death. Up to 2023, taking advantage of this special deduction has meant that the usual annual 1.1-million-yen tax-free gift allowance is no longer in effect for that particular donor, meaning in turn that gift-tax returns had to be filed by recipients for gifts of any value from the same donor (excluding gifts considered to be in accord with standard social norms).

Beginning in 2024, those who make use of the early-inheritance system will also be able to make annual tax-free gifts of up to 1.1 million yen to their designated beneficiaries. Moreover, it appears that these gifts will not be included in the value of the decedent's estate regardless of how recently they were given. This change -- should it be confirmed by the language of the final law -- can be considered one of the few significantly advantageous aspects of the tax-code revision for taxpayers, and may actually serve to promote the government's stated goal of encouraging the early transfer of assets between generations, even if also generates a certain amount of uncertainty regarding the financial security of long-lived seniors.

Remember that grandchildren do not usually qualify as statutory heirs (the exception being when the decedent has been predeceased by a child with children of his/her own), nor do children's spouses or any other in-laws. This means that, unlike statutory heirs, these relatives are not eligible for posthumously retained distributive shares, but neither are they subject to the look-back rule for annual gifts. Gifting grandchildren, the spouses of children, and other individuals as early and as often as possible is thus probably the best way to reduce the size of one's estate before one's demise.

Credits

Many thanks to the following RetireWiki.jp users for writing this article:

CAM, Adamu