TCL Portal

Japan's Spousal Tax Credit: The ¥160M Shelter and the Second-Death Trap

Published:
  • #spousal tax credit
  • #Japan inheritance tax
  • #second inheritance
  • #nijisouzoku
  • #estate planning
  • #cross-border inheritance
日本語

For a surviving spouse in Japan — or a family member watching how an estate gets divided — one provision in the inheritance tax code stands out for how generous it is: the spousal tax credit. Used well, it can bring the surviving spouse’s own tax bill to zero. Used without a second look, “just leave everything to the surviving spouse” can quietly raise the total tax the family pays across two inheritances instead of one.

This is general information, not advice. Tax rules change and every family’s asset mix and structure is different. Figures here are current as of 2026 and sourced from Japan’s National Tax Agency (NTA). Confirm with a licensed zeirishi (tax accountant) before acting.

What the spousal tax credit actually does

The spousal tax credit exempts a surviving spouse from inheritance tax on assets they actually receive through estate division or bequest, up to whichever is larger of the following two figures (NTA No.4158):

  1. ¥160,000,000
  2. The spouse’s statutory (legal) share of the estate

That “whichever is larger” structure is the key design feature. In smaller estates, the flat ¥160,000,000 figure is what matters. In larger estates, the spouse’s statutory share — one-half of the estate, for example, if the heirs are the surviving spouse and two children — can exceed ¥160,000,000, and the exemption tracks that larger number instead.

In practice, this means a surviving spouse can inherit a very large estate and owe essentially no inheritance tax personally, as long as what they receive stays within their statutory share.

Conditions for claiming it

A few conditions apply:

The inheritance tax filing deadline is generally 10 months from the day after the heir becomes aware of the death (NTA No.4205). For heirs living abroad, gathering koseki (family registry) documents and locating assets can eat into that window quickly — 10 months is not as long as it sounds when coordinating across countries.

Why “leave everything to the spouse” isn’t automatically optimal

Because the credit is so generous, the default instinct in many families is to route as much of the estate as possible to the surviving spouse — the logic being that this minimizes tax today. That reasoning only accounts for the first death. Once you factor in the second death — when the surviving spouse’s own estate later passes to the children — the picture changes.

Two structural features make the second inheritance more expensive:

  1. No spousal credit is available. By definition, the second inheritance has no surviving spouse — the assets pass to children or other heirs. The ¥160,000,000-or-statutory-share shelter that applied at the first death simply does not exist at the second.

  2. The basic deduction shrinks. Japan’s inheritance tax basic deduction is calculated as ¥30,000,000 + ¥6,000,000 × the number of statutory heirs (NTA No.4102, No.4152). If the first death had three statutory heirs (spouse plus two children), the deduction was ¥48,000,000. At the second death, the spouse is no longer a statutory heir, leaving two children — a deduction of only ¥42,000,000.

Put those two effects together, and routing a large share of the estate to the spouse at the first death can mean that estate — combined with whatever the spouse already owned — gets taxed at the second death under a smaller deduction, with no spousal credit to soften it. Added up across both deaths, the family’s total tax bill can end up higher than if the estate had been split more evenly between the spouse and children from the start.

How to think about the split

When deciding how to divide the first estate, it helps to weigh a few things together:

There’s no formula that spits out a single right answer here — the optimal split depends on family structure, the nature of the assets (a family home versus liquid financial assets), and the spouse’s age and health. It is worth asking a zeirishi to model both inheritances together before finalizing the estate division agreement, rather than optimizing only for the first death.

Cross-border families

The spousal credit itself is available regardless of the spouse’s or heirs’ nationality or residence. What does vary by residence and nationality is the scope of assets subject to Japanese inheritance tax in the first place — worldwide assets versus Japan-situs assets only. That distinction is covered in our Japan Inheritance Tax Guide for Foreigners and Japan Inheritance Tax: Non-Resident Rules.

If a surviving spouse living overseas owes Japanese inheritance tax, filing and payment still happen in Japan, and appointing a locally registered tax administrator is often part of the process. International couples and families with an overseas-resident spouse should engage a professional early — the interaction between residence rules and the spousal credit adds a layer of complexity that’s easy to get wrong from a distance.

Further reading

References

Cross-checked against NTA sources as of 2026-07-19.

FAQ

How much can a surviving spouse inherit tax-free in Japan?

A surviving spouse pays no inheritance tax on assets they actually receive up to whichever is larger: ¥160,000,000, or their statutory (legal) share of the estate. In larger estates, the statutory share — for example, one-half of the estate if the heirs are the spouse and two children — can exceed ¥160,000,000.

Does the spousal credit guarantee zero inheritance tax for the whole family?

No. It reduces or eliminates the spouse's own tax, but assets inherited by children or other heirs are still taxed under the normal rules. It's also possible to structure the split so the spouse pays little now but the family pays more later, when the spouse's own estate is inherited by the children.

What do I need to do to claim the spousal credit?

You must file an inheritance tax return by the deadline — generally 10 months from the day after you become aware of the death — and the assets going to the spouse generally need to be finalized in the estate division by that date. If division isn't finished by the deadline, filing a 'statement of expected division within 3 years' preserves eligibility for the credit once the split is completed within that 3-year window.

Is a return required even if the spousal credit brings tax to zero?

Yes. The spousal credit only applies if an inheritance tax return is filed. A zero final tax bill does not eliminate the filing requirement.

What is the 'second-death trap' and why does it matter?

If the surviving spouse inherits a large share at the first death, that wealth — plus whatever the spouse already owned — becomes part of the spouse's own taxable estate when they later die (the 'second inheritance'). At that point there is no spousal credit available, and the basic deduction shrinks because there is one fewer statutory heir. Combined across both deaths, the family can end up paying more tax than if the estate had been split more evenly the first time.

About the authors

TCL Financial Planning Desk

A financial-planning (FP) editorial desk explaining Japan’s legal system, official statistics, and inheritance/gift practice for a global audience. Grounded in first-party sources (National Tax Agency, MHLW, e-Stat).

Author profile →