Can an estate-division agreement, once concluded, be redone? Sorting out rescission by agreement, nullity and cancellation

In short: an estate-division agreement, once concluded, can be redone if all heirs agree. The Supreme Court judgment of 27 September 1990 held that the co-heirs may, by their unanimous agreement, rescind an already-concluded estate-division agreement (rescission by agreement) and then conclude a fresh division, and that this is not, as a matter of law, inherently barred. On the other hand, a statutory rescission for non-performance under Civil Code Article 541—because one heir does not perform a debt assumed in the agreement—is not allowed; that is the Supreme Court judgment of 9 February 1989. Even without everyone's agreement, where there is mistake (Civil Code Article 95) or fraud or duress (Civil Code Article 96), the original agreement may be cancelled. The point requiring care is tax: where the original division was validly concluded, redoing it by everyone's agreement means the redistribution is, in principle, treated as a gift or exchange and may be subject to gift tax or capital-gains tax (it is said not to constitute a "division" under Inheritance Tax Act Basic Circular 19-2-8). By contrast, where the original division has a ground of nullity or cancellation, the redo is treated as within the scope of estate division and the tax treatment is corrected too. This article is general information; the propriety of a concrete division and of nullity or cancellation rests with a qualified professional and the parties. Preparing the agreement is handled by Yotsuba Administrative Scrivener Office (administrative scrivener); disputes, mediation and adjudication among heirs by an attorney; the registration (title transfer) accompanying re-division by a judicial scrivener; and the tax judgement by a tax accountant, each as an independent business under a separate contract. Yotsuba Administrative Scrivener Office and Yotsuba Real Estate Co., Ltd. are separate businesses, and our office receives no referral fee.

Can a concluded estate-division agreement be redone by the unanimous agreement of all heirs?

It can. Co-heirs may, except where the decedent prohibited division by will, divide the estate by agreement at any time (Civil Code Article 907(1)). And the Supreme Court judgment of 27 September 1990 (Minshu Vol. 44, No. 6, p. 995) held that co-heirs may rescind all or part of an already-concluded estate-division agreement by their unanimous agreement (rescission by agreement) and then conclude a fresh division, and that this is not, as a matter of law, inherently barred. If all the heirs can line up to "reset it and start over," the road of re-agreement by rescission opens.

Conversely, without everyone's agreement, one side cannot redo it unilaterally. For example, even where an heir who took specific property under the agreement fails to perform the debt they assumed in return—to "pay compensation money to the other heirs"—the other heirs, as creditors, cannot rescind the estate-division agreement for non-performance under Civil Code Article 541. This is the reasoning shown in the Supreme Court judgment of 9 February 1989 (Minshu Vol. 43, No. 2, p. 1): estate division ends with the conclusion of the agreement, after which only a debt-and-claim relationship between the parties remains. Non-payment of compensation money is handled not as a redo of the division but as a matter of demanding payment of that money.

Type of redo	Requirement	Rough availability
Rescission by agreement	Unanimous agreement of all heirs	Possible (Supreme Court, 27 Sep 1990)
Statutory rescission (non-performance)	Rescission after demand under Article 541	Not possible (Supreme Court, 9 Feb 1989)
Nullity	A ground that makes it void from the start	Void from the beginning if recognised
Cancellation	Mistake, fraud, duress, etc.	Cancellable if recognised

The basics of a full division are covered in Can you make an estate-division agreement yourself?.

Even without agreement, in what cases are nullity or cancellation recognised?

Apart from rescission by everyone's agreement, where the original agreement itself is defective, one may be able to assert nullity or cancellation. Typical cases are where there was a mistake in the manifestation of intention (Civil Code Article 95) or where consent was obtained by fraud or duress (Civil Code Article 96). For example, if a mistake—such as agreeing on a misperception of the existence or value of important property—is material in light of the purpose of the juristic act and transactional common sense, cancellation may be recognised. Where one agreed having been deceived (fraud) or threatened (duress), there is likewise room to cancel.

Also, an agreement made while lacking some of the heirs, or made by adding a person who is not an heir, is in principle void. A typical case is where a true heir comes to light later. That said, which circumstances satisfy the "materiality" of a mistake, whether fraud or duress is established, and whether nullity or cancellation is recognised are individual legal judgements based on the facts, and if there is a dispute, the court ultimately decides. An administrative scrivener supports preparing the agreement where all heirs have reached agreement, but does not judge whether nullity or cancellation succeeds, nor act for the negotiation or litigation over it. Those are an attorney's work.

Why can redoing it incur gift tax or capital-gains tax?

This is where there is the most misunderstanding in practice. Even where a redo by rescission by agreement is recognised in the world of civil law, a different evaluation is made in the world of tax. Where the original estate division was validly concluded and property was once concretely vested in each heir, redividing the property by everyone's agreement means that redistribution is, in principle, treated not as "estate division" but as a gift or exchange, etc. between the heirs. The National Tax Agency's Q&A examples and the Nagoya Regional Taxation Bureau's written responses also state that, where property concretely vested in each person is redistributed as a redo of the division, it does not constitute the "division" referred to in Inheritance Tax Act Basic Circular 19-2-8 and should generally be judged as a gift or exchange.

As a result, if property is moved without consideration, gift tax may fall on the heir who receives it. If consideration is involved, capital-gains tax (income tax) may fall on the heir who hands it over. Something that had fit within the frame of inheritance tax thus invites new taxation by being redone.

On the other hand, it is a different story where the original division has a ground of nullity or cancellation. In that case, the original division is legally subject to being redone, and the re-division is still treated as within the scope of "estate division," so in principle no gift-tax or capital-gains-tax problem arises. In other words, whether it is "everyone changing their mind and redividing (rescission by agreement)" or "correcting a defect in the original agreement (nullity or cancellation)" greatly changes the tax treatment. Judging which it is, and how tax will fall, is a tax accountant's work. Our office does not give tax consultation. The entry point to whether an inheritance-tax filing is needed is organised in Who needs to file inheritance tax. For the individual tax amount and treatment, be sure to consult a tax accountant.

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If new estate property or a new heir comes to light later, does it mean a redo?

Not necessarily a full redo. Where new estate property is found after the agreement, it is in principle enough to re-agree among all heirs only about that property. If the agreement includes a reservation such as "estate property not stated in this agreement shall be agreed separately," there is usually no need to redo a division already completed. Conversely, where one agreed believing "this is everything" without knowing of important property, cancellation of the whole original agreement as a mistake (Civil Code Article 95) may be at issue.

Where a true heir comes to light later, the original agreement made lacking that person is in principle void, and everyone redoes it. Note that estate division takes effect retroactively to the time the inheritance began, but this cannot prejudice the rights of third parties (Civil Code Article 909). Where, before the redo, a third party such as a buyer who acquired real estate on the premise of the original division has appeared, the retroactive effect may not be assertable against that third party. The rights relationships in such third-party situations require individual legal judgement, and if there is a dispute, they fall within the domain of an attorney and the court.

When the heirs cannot agree on a redo, who should you consult?

A redo divides by stage among different roles:

• Support in preparing the (re-)agreement where all heirs have reached agreement → Yotsuba Administrative Scrivener Office (administrative scrivener)
• Negotiation over whether a redo is possible and whether nullity or cancellation succeeds, estate-division mediation and adjudication, and individual legal judgement on rights and duties → an attorney
• Title transfer of real estate accompanying re-division (inheritance registration and correction registration) → a judicial scrivener
• Judgement of tax matters such as gift tax and capital-gains tax, and the request for correction → a tax accountant
• Consultation on selling or using inherited real estate → Yotsuba Real Estate Co., Ltd.

When talk of a redo cannot be settled and enters the stage of a "dispute," acting for the negotiation and asserting and proving in mediation and adjudication become an attorney's work. Undivided property that cannot be settled is resolved by applying to the family court for estate-division mediation and adjudication. The flow of the procedure is summarised in Estate-division mediation and adjudication. Yotsuba Administrative Scrivener Office supports preparing the agreement where all heirs have reached agreement, as an independent business. Disputes are handled by an attorney, title transfer by a judicial scrivener, tax by a tax accountant, and selling or using inherited real estate by Yotsuba Real Estate Co., Ltd. (a separate business), each under a separate contract. Yotsuba Administrative Scrivener Office and Yotsuba Real Estate Co., Ltd. are separate businesses. Our office receives no referral fee. For the whole picture of inheritance procedure, see Inheritance procedures; for the flow of engagement, Engagement Flow; for fees, Fee Schedule; and for inherited real estate, Inherited Real Estate Counter. The final judgement on whether a redo is appropriate and which type it is, is made by a qualified professional and the parties in light of the circumstances.

FAQ

Q. Can an estate-division agreement, once concluded, be redone?
A. It can be redone if all heirs agree. The Supreme Court judgment of 27 September 1990 held that concluding a fresh division after rescission by everyone's agreement is not, as a matter of law, inherently barred. However, a statutory rescission under Civil Code Article 541 for an heir's non-performance of a debt assumed in the agreement is not possible (Supreme Court judgment of 9 February 1989).

Q. Are there cases where it can be redone without everyone's agreement?
A. Yes. Where the original agreement involved a mistake (Civil Code Article 95) or fraud or duress (Civil Code Article 96), one may assert cancellation; where there is a defect such as lacking an heir, one may assert nullity. But success is an individual judgement based on the facts, and if disputed, the court decides. Judging success and acting for negotiation or litigation are an attorney's work.

Q. I heard that redoing it incurs tax. Is that true?
A. After a validly concluded original division, redividing by everyone's agreement means the redistribution is, in principle, treated as a gift or exchange and may be subject to gift tax or capital-gains tax (it does not constitute a "division" under Inheritance Tax Act Basic Circular 19-2-8). On the other hand, where the original division has a ground of nullity or cancellation, it is treated as within estate division, and in principle no new tax arises. Consult a tax accountant on the judgement.

Q. If property or an heir is found later, is it a full redo?
A. In principle not a full redo. New property need only be agreed for that part, and a reservation clause can limit the scope of re-agreement. However, an agreement lacking a true heir is void and is redone by everyone. The retroactive effect cannot prejudice third parties' rights (Civil Code Article 909).

Sources (Primary Information)

• e-Gov Law Search, "Civil Code" (Act No. 89 of 1896), Article 95 (mistake), Article 96 (fraud or duress), Article 541 (rescission after demand), Article 907 (agreement on estate division), Article 909 (effect of estate division; retroactive effect and protection of third parties) (accessed 2026-10-01)
• Supreme Court, First Petty Bench, judgment of 27 September 1990 (Minshu Vol. 44, No. 6, p. 995; whether an already-concluded estate-division agreement may be rescinded by everyone's agreement and re-agreed) (accessed 2026-10-01)
• Supreme Court, First Petty Bench, judgment of 9 February 1989 (Minshu Vol. 43, No. 2, p. 1; whether a statutory rescission under Civil Code Article 541 for non-performance in an estate-division agreement is possible) (accessed 2026-10-01)
• National Tax Agency Q&A examples and Nagoya Regional Taxation Bureau written-response examples (redistribution of estate and gift or exchange; the meaning of "division" in Inheritance Tax Act Basic Circular 19-2-8; nta.go.jp) (accessed 2026-10-01)

This article is general information and does not guarantee, for a particular estate-division agreement, whether a redo is possible, whether nullity or cancellation succeeds, or the tax treatment. Whether rescission by agreement is recognised, whether cancellation for mistake, fraud or duress is established, and whether redistribution is taxed as a gift or exchange are individual judgements in light of the circumstances, and if there is a dispute among the heirs, they are settled by the family court's mediation and adjudication or by litigation. Negotiation and mediation over whether a redo is possible, and individual legal judgement on rights and duties, are by an attorney; title transfer accompanying re-division (inheritance registration and correction registration) by a judicial scrivener; judgement of tax matters such as gift tax and capital-gains tax and the request for correction by a tax accountant; and selling or using inherited real estate by Yotsuba Real Estate Co., Ltd., each as an independent business under a separate contract. Yotsuba Administrative Scrivener Office and Yotsuba Real Estate Co., Ltd. are separate businesses. Our office receives no referral fee. Individual judgements are made by a qualified professional after a meeting. Written by Joji Uramatsu, administrative scrivener and licensed real estate broker.