Does an unborn child have inheritance rights? How a fetus is treated in a pre-birth estate division

In short: if the spouse was pregnant when the decedent died, the unborn child (fetus) also has inheritance rights. The basis is Civil Code Article 886, paragraph 1, which provides that "with respect to inheritance, a fetus is deemed to have already been born." However, under paragraph 2 of the same Article, where the fetus is born dead (stillbirth) this rule does not apply and the fetus is not treated as an heir. The enjoyment of private rights begins at birth (Civil Code Article 3, paragraph 1) as a rule, and the fetus is an exception to this. In practice, because the range of heirs is not fixed before birth, an estate division is generally organised as something done after birth. This article is general information organising the range of heirs and statutory shares; specific legal judgements are left to a qualified professional such as a lawyer.

On what article is the unborn child's inheritance right based?

The Civil Code provides that the enjoyment of private rights (legal capacity) begins at birth (Civil Code Article 3, paragraph 1). Strictly, an unborn fetus would have no legal capacity and could not be an heir. But applying this rule in inheritance would sharply differ the treatment of a child born a few days after the father's death from a child already born, which would be unfair.

Civil Code Article 886, paragraph 1 therefore places an exception treating the fetus as an heir: "with respect to inheritance, a fetus is deemed to have already been born." The same idea of exception also appears for claims for damages in Civil Code Article 721 ("with respect to a claim for damages, a fetus is deemed to have already been born") and for bequests in Civil Code Article 965 (which applies Article 886 to legatees).

Situation	Treatment of the fetus	Basis
General rule on legal capacity	Begins at birth	Civil Code Art. 3(1)
Inheritance	Deemed already born	Civil Code Art. 886(1)
Bequest (legatee)	Article 886 applied	Civil Code Art. 965
Claim for damages	Deemed already born	Civil Code Art. 721

So if the mother was pregnant when the father died, the fetus is counted as an heir alongside the mother and any children already born.

May an estate division be concluded before birth?

In conclusion, it is generally organised as difficult to conclude, before birth, an estate division with the fetus as a party. Civil Code Article 886, paragraph 1 deems the fetus "already born," but learned opinion and practice treat as influential the view that the fetus acquires legal capacity retroactively to the time inheritance opened only once it is safely born (the condition-precedent theory). On this view, because the range of heirs is not yet fixed before birth, an estate division that includes the fetus cannot be validly concluded.

Furthermore, even after a safe birth, in an estate division where the interests of the mother (person with parental authority) and the child conflict, the parent cannot represent the child, and it is necessary to ask the family court to appoint a special representative (Civil Code Article 826, paragraph 1). For these reasons, in practice it is common to wait for the birth and, where necessary, appoint a special representative before holding the estate-division discussion. What can be done at which stage differs by case, and how to proceed with an estate division where interests conflict before and after birth is judged individually by a qualified professional such as a lawyer.

If there is a stillbirth, how does the share go back?

Civil Code Article 886, paragraph 2 provides that "the preceding paragraph does not apply where the fetus is born dead." That is, in a stillbirth the fetus is treated as never having been an heir, and the "deemed already born" effect of paragraph 1 does not arise.

As a result, where there is a stillbirth, the shares are recalculated among the remaining heirs. For example, in a case where the mother and the fetus were to be heirs of the father, if the fetus is stillborn, the heirs are fixed as the mother (and, if there are other children, lineal ascendants, or siblings, those persons). Because changing the range of heirs also changes the statutory shares, waiting for the result of the birth to fix things—rather than rushing a discussion before birth—is also practical in the sense of avoiding having to redo it.

How are the statutory shares and the number for the inheritance-tax basic deduction counted?

Statutory shares are set by Civil Code Article 900. Where the fetus is counted as an heir, this provision applies as well.

Combination of heirs	Spouse	Child / lineal ascendant / sibling	Basis
Spouse and child	One-half	One-half divided equally among children (item 4)	Civil Code Art. 900(i)
Spouse and lineal ascendant	Two-thirds	One-third among lineal ascendants	Civil Code Art. 900(ii)
Spouse and sibling	Three-quarters	One-quarter among siblings	Civil Code Art. 900(iii)

For example, with a spouse, one child and one fetus, if the fetus is safely born there are two children: the spouse takes one-half, and the two children share the remaining one-half equally (Civil Code Article 900, items 1 and 4).

On the other hand, the inheritance-tax basic deduction is calculated as "30 million yen + 6 million yen × the number of statutory heirs" (Inheritance Tax Act Article 15). Whether a fetus can be included in the number of statutory heirs, and how to handle the filing or a request for correction if it has not been born by the filing deadline, are tax judgements based on National Tax Agency circulars and are the field of a tax accountant. Because the number can change before and after birth, confirm the specific inheritance-tax treatment with a tax accountant.

Who handles negotiation, registration and tax?

An inheritance involving a fetus is a situation that is hard to move until the range of heirs is fixed by birth. The roles are as follows.

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• Organising the inheritance relationship and statutory shares, collecting family registers, and preparing materials to fix the range of heirs → Yotsuba Administrative Scrivener Office (administrative scrivener). We provide materials and information only, and do not make specific legal judgements
• Agent negotiation and mediation of an estate division where interests conflict before and after birth, and family-court procedures such as the application to appoint a special representative → lawyer
• Inheritance registration (change of title to real estate) → judicial scrivener
• The inheritance-tax filing and how to count the number of statutory heirs for the basic deduction → tax accountant
• Sale and use of inherited real estate → Yotsuba Real Estate Co., Ltd. (licensed real estate broker)

Yotsuba Real Estate Co., Ltd., a separate business from Yotsuba Administrative Scrivener Office, handles consultations on the sale and use of inherited real estate under a separate contract as an independent business (see Inheritance real-estate support). Agent negotiation and mediation of the estate division and the application to appoint a special representative are for a lawyer, inheritance registration for a judicial scrivener, and inheritance tax for a tax accountant; each contracts separately as an independent business. Each field is on the premise that you contract separately with each counter or qualified professional, and our office receives no referral fee. For the flow of engagement, see Engagement Flow; for fees, see Fee Schedule; and for inheritance work, see Inheritance and Wills Services. If you are unsure about the range of heirs, When an heir has dementia, is missing, or is a minor is helpful; on statutory shares, The basics of statutory shares; and on collecting family registers, Where to begin with inheritance: collecting family registers and investigating heirs.

FAQ

Q. I was pregnant when the father died. Is the fetus an heir too?
A. Yes. Civil Code Article 886, paragraph 1 provides that "with respect to inheritance, a fetus is deemed to have already been born," and treats the fetus as an heir. However, under paragraph 2 of the same Article, where it is born dead (stillbirth) this rule does not apply and it does not become an heir. The enjoyment of private rights begins at birth (Civil Code Article 3, paragraph 1) as a rule, and the fetus is given an exception in inheritance, bequests and claims for damages.

Q. May I finish the estate-division discussion before the birth?
A. It is generally organised as difficult. The influential view is that the fetus acquires legal capacity retroactively to the time inheritance opened only once safely born (the condition-precedent theory); on this view, before birth the range of heirs is not fixed and a discussion including the fetus cannot be validly concluded. It is common to wait for the birth and, where necessary, appoint a special representative before discussing. How to proceed is judged individually by a lawyer.

Q. In a stillbirth, what happens to a division already decided?
A. Under Civil Code Article 886, paragraph 2, a stillborn fetus is treated as never having been an heir. Because the shares are recalculated among the remaining heirs, having fixed a division before birth may require redoing it. It is practical to wait for the result of the birth to fix things.

Q. Can the inheritance-tax basic deduction count the fetus too?
A. The inheritance-tax basic deduction is calculated as "30 million yen + 6 million yen × the number of statutory heirs" (Inheritance Tax Act Article 15). Whether a fetus can be included in the number of statutory heirs, and how to handle the filing or a request for correction if it has not been born by the deadline, are the field of a tax accountant and are judged based on National Tax Agency circulars. Because the number can change before and after birth, confirm with a tax accountant.

Sources (Primary Information)

• e-Gov Law Search, "Civil Code" (Act No. 89 of 1896), Article 3, paragraph 1 (enjoyment of private rights); Article 721 (claim for damages and the fetus); Article 826, paragraph 1 (conflict-of-interest acts and a special representative); Article 886, paragraphs 1 and 2 (legal capacity of a fetus regarding inheritance); Article 900 (statutory shares); Article 965 (application to legatees) (accessed 2026-10-28)
• e-Gov Law Search, "Inheritance Tax Act" (Act No. 73 of 1950), Article 15 (basic deduction from the estate; number of statutory heirs) (accessed 2026-10-28)
• National Tax Agency Tax Answers No. 4152 "Calculation of inheritance tax" and No. 4170 "When an heir is a minor or has a disability," and other guidance on calculating inheritance tax (basic deduction; how to count the number of statutory heirs; the specific treatment where there is a fetus is judged by a tax accountant) (accessed 2026-10-28)

This article is general information and does not guarantee or judge the individual range of heirs, the statutory shares, the time at which an estate division can be concluded, or the inclusion of a fetus in the taxable value or basic deduction for inheritance tax. The organisation of learned opinion and practice differs in conclusion by case and the law is amended, so always confirm with the latest provisions and a professional's individual judgement. Agent negotiation and mediation of an estate division where interests conflict before and after birth and the application to appoint a special representative are handled by a lawyer, inheritance registration by a judicial scrivener, the inheritance-tax filing by a tax accountant, and the sale and use of inherited real estate by Yotsuba Real Estate Co., Ltd. (licensed real estate broker), a separate business, each as an independent business under separate contracts and procedures. Our office receives no referral fee. Specific legal judgements are made by a qualified professional such as a lawyer after a meeting. Written by Joji Uramatsu, administrative scrivener and licensed real estate broker.