Japanese Inheritance Tax, Step One: What a ¥300 Million Estate Leaves Behind

"How much of what I built in Japan can I actually leave to my children?" We hear this question again and again from wealth holders living in Japan. Japan's inheritance tax reaches a top rate of 55%, while their home country — China — has no inheritance tax at all. Faced with that gap, where should one begin? This article works through a hypothetical ¥300 million estate, following the order in which the tax is actually determined.

Inheritance Tax Is Determined in Three Steps

Step one: subtract the basic deduction. Article 15 of the Inheritance Tax Act sets the basic deduction at "¥30 million + ¥6 million × the number of statutory heirs." For a spouse and two children — three heirs — the deduction is ¥30M + ¥6M × 3 = ¥48 million. If the estate falls below this, no inheritance tax arises.

Step two: apportion the taxable estate by statutory shares. Subtracting the ¥48M deduction from ¥300M leaves ¥252 million as the taxable base. Divided by statutory shares, the spouse takes 1/2 = ¥126M and each child takes 1/4 = ¥63M.

Step three: apply the rate table. Article 16 of the Act sets the progressive rates below (the deduction column is the quick-calculation offset derived from that rate structure).

The spouse's ¥126M at 40% less ¥17M is ¥33.4M; each child's ¥63M at 30% less ¥7M is ¥11.9M. The total inheritance tax is ¥57.2 million, which the heirs then bear in proportion to what each actually receives.

The Spousal Credit: Deferred, Not Erased

Article 19-2 of the Act provides a substantial credit for the surviving spouse. Where the spouse's share does not exceed the greater of "¥160 million" or "the statutory share," no inheritance tax falls on the spouse. If the spouse's ¥33.4M is thus reduced to zero, the effective burden in our example drops to ¥23.8 million.

But there is a structural trap here. When the spouse inherits the larger portion to suppress the tax, those same assets become taxable again on the spouse's own death — the second succession. The burden has not disappeared; it has merely been deferred to the next generation. Optimizing for the first succession alone can produce an unexpected bill at the second.

A Second Issue: Worldwide Assets

For a decedent or heir domiciled in Japan, assets located abroad may, in principle, also fall within the scope of Japanese inheritance tax. Property, deposits, and shares left in the home country must be considered within the Japanese framework. The assumption that "home-country assets have nothing to do with Japan" usually does not hold.

Treat It as a Structural Question

Inheritance tax is not a one-off calculation but a structural question in which residency, asset location, and the order of succession all interact. The first things to confirm are: the number of statutory heirs and the basic deduction; the combined burden across the first and second successions once the spousal credit is used; and whether any overseas assets exist. The system offers several mechanisms to ease the burden, but whether they apply turns on the specific facts.

This article provides general information on tax systems and does not constitute individual tax consultation. Specific filings and tax computations are handled by licensed partner tax accountants whom we introduce.