Japan’s 55% maximum inheritance tax rate is the highest in the developed world. The Japanese legislature built a specific life insurance exemption into the Inheritance Tax Act — ¥5 million per statutory heir — as a deliberate policy tool. For UHNWI clients with Japanese connections, life insurance is not peripheral to estate planning. It is central to it.

GLOBAL ESTATE PLANNING SERIES

Overview — The Global Landscape
Part 2 — EU Civil Law: France, Germany, Spain and Belgium
Part 3 — The UAE and GCC: Succession Without Estate Tax
Part 4 — Japan and Asia: The World’s Highest Inheritance Tax Rate (You are here)
Part 5 — The United States: Estate Tax, the ILIT, and Where PPLI Fits
Part 6 — South Africa: Estate Duty and the Named Beneficiary Rule

JAPAN: THE INHERITANCE TAX STRUCTURE

Rates and basic exemption

Japan’s inheritance tax (sozokuzei) is a national tax administered by the National Tax Agency (NTA). It applies to the recipients of an inheritance — not to the estate itself — at progressive rates that apply after the basic exemption is subtracted from the gross estate.

The basic exemption, confirmed by PwC’s Worldwide Tax Summaries, is: ¥30 million + (¥6 million × number of statutory heirs). For an estate with three statutory heirs (spouse plus two children), this produces a basic exemption of ¥48 million (approximately USD 320,000 at current rates). Below this threshold, no inheritance tax is due and no filing is required.

Above the exemption, the taxable estate is notionally divided among statutory heirs in proportion to their statutory shares, and progressive tax rates are applied to each heir’s notional share:

The practical impact of the per-heir calculation method is that the 55% rate is applied only to the portion of each heir’s notional share exceeding ¥600 million — not to the gross estate. For a ¥1 billion estate with three heirs, the top rate does not necessarily apply to the full estate. This is an important nuance that affects the effective rate for all but the largest estates.

The spousal exemption

The surviving spouse is entitled to a tax credit that eliminates inheritance tax on their share up to the greater of (i) their statutory share of the inheritance or (ii) ¥160 million. In practice, this means that on the first death in a married couple, very little or no inheritance tax is typically due. The full tax burden falls on the second death, when assets pass to children. This is the primary reason Japanese estate planning focuses heavily on inter-generational transfer strategies — including the systematic use of life insurance.

THE LIFE INSURANCE EXEMPTION: ¥5 MILLION PER STATUTORY HEIR

The Japanese Inheritance Tax Act explicitly exempts a portion of life insurance death benefits from inheritance tax. The exemption, as confirmed by the NTA and verified by PwC and multiple specialist sources, is: ¥5 million × the number of statutory heirs.

For an estate with three statutory heirs, the life insurance exemption amounts to ¥15 million. For five heirs, ¥25 million. This exemption applies only where the premiums were paid by the deceased (i.e., the policyholder is the life assured) — if a third party paid the premiums, different rules apply (the benefit may be treated as a gift rather than an inheritance). The same ¥5 million × heirs exemption also applies to retirement allowances paid within three years of death.

The mechanics are straightforward: the total life insurance death benefit paid to statutory heirs is reduced by the exempt amount before being included in the inheritance tax calculation. A life policy of ¥15 million (with three heirs) produces zero taxable inheritance from that policy. Policies above the exempt amount have the excess included in the taxable estate.

PLANNING POINT — JAPAN
The Japanese life insurance exemption is a codified, NTA-confirmed planning tool, not a grey area. It is widely used across the wealth spectrum. For UHNWI clients, the exemption itself (¥5M × heirs) is modest relative to estate size — but life insurance provides three additional functions beyond the exemption: (1) liquidity to pay the inheritance tax bill, which is due within 10 months of death; (2) a mechanism to equalise distributions among heirs where illiquid assets (real estate, business interests) form the bulk of the estate; and (3) for offshore PPLI held by non-Japanese trustees, potential exclusion from the Japanese taxable estate depending on the residency and nationality of the parties involved. The Japan tax residency rules are complex — especially the 10-year lookback test — and specialist advice is essential.

JAPAN’S RESIDENCY AND NATIONALITY RULES: THE LOOKBACK PROBLEM

Japan’s inheritance tax jurisdiction has expanded significantly in recent years. The key rules, as confirmed by PwC’s Worldwide Tax Summaries, are:

• If an heir has a jusho (domicile) in Japan at the time of receiving the inheritance, worldwide assets are subject to Japanese inheritance tax.
• If the decedent is a Japanese national and had a jusho in Japan within 10 years of death, Japanese inheritance tax applies to worldwide assets of all heirs — regardless of where the heirs are resident.
• A “short-term resident” (Table 1 visa holder residing in Japan for less than 10 of the last 15 years who is not a Japanese national) may be exempt on non-Japan situs assets, subject to conditions.

The practical consequence is that Japanese nationals who leave Japan remain exposed to Japanese inheritance tax on worldwide assets for 10 years after departure if they were Japan-domiciled within that period. This “tail” is analogous to the UK’s post-April 2025 long-term residence tail — and creates similar planning urgency for internationally mobile clients.

OFFSHORE PPLI AND JAPAN

For Japanese UHNWI clients — particularly those with international business interests, non-Japan situs assets, or residency outside Japan — offshore PPLI structures held by non-Japanese trustees or institutions may be outside the Japanese taxable estate, depending on the specific residency and nationality profile of the parties. This is a technically complex area requiring Japanese specialist tax advice.

Singapore has emerged as a significant PPLI structuring hub for Japan-connected clients, given its proximity, its strong regulatory framework (covered in our Asian PPLI hubs analysis), and the absence of Singaporean estate or inheritance tax. Mauritius, with its double tax treaty network, is a secondary option. The key question for any structure is whether the policy assets are within the Japanese inheritance tax net under the residency and nationality rules.

SOUTH KOREA: SIMILAR STRUCTURE, SIMILAR RATES

South Korea’s inheritance tax (sangsogse) operates on a comparable structure to Japan’s, with a top rate of 50%. The 2020 death of Samsung Chairman Lee Kun-hee produced a widely reported inheritance tax liability of approximately KRW 12 trillion (roughly USD 10 billion at current rates) on his estate — the largest single inheritance tax liability in Korean history, settled by the family through a combination of cash payment and art donations to public institutions.

Korea’s inheritance tax applies to the estate itself (an estate-based rather than beneficiary-based tax), with progressive rates and a basic deduction. Life insurance death benefits paid to named beneficiaries are subject to inheritance tax where the deceased paid the premiums. Exemptions exist up to a threshold, with the remainder included in the taxable estate.

Korea has been under pressure to reform its inheritance tax system, particularly the global maximum rate, which significantly exceeds OECD averages. Reform discussions have been ongoing but no fundamental restructuring has been enacted as of the date of this publication.

THE REST OF ASIA: A DIVIDED PICTURE

The Asian inheritance tax landscape is sharply divided. Singapore and Hong Kong impose no estate or inheritance tax — both abolished it (Singapore in 2008, Hong Kong in 2006). These jurisdictions are therefore PPLI structuring hubs rather than PPLI tax problem jurisdictions. Australia imposes no inheritance tax, though capital gains tax consequences can arise on death for certain assets.

India abolished its estate duty in 1985 and has not reintroduced it, though periodic calls for its restoration arise in policy discussions. Indonesia, Thailand, Malaysia, and most of Southeast Asia do not impose meaningful estate or inheritance taxes. The Philippines imposes an estate tax at a flat 6% rate, which is relatively modest.

Japan and South Korea are, therefore, the primary Asian jurisdictions where life insurance and inheritance tax interact in a way that drives PPLI-relevant planning conversations.

SOURCES AND FURTHER READING

• Japan National Tax Agency, Inheritance Tax guidance — nta.go.jp
• PwC, Worldwide Tax Summaries — Japan: Other Taxes — taxsummaries.pwc.com
• EY, Worldwide Estate and Inheritance Tax Guide 2024 — Japan chapter: ey.com
• EY, Worldwide Estate and Inheritance Tax Guide 2024 — South Korea chapter: ey.com
• PPLI.Solutions, Asian PPLI Hubs analysis
• PPLI.Solutions, Mauritius jurisdiction profile