Assignment of an inherited share and the certificate of special benefit (proof of no inherited share): when do you use each?

In short: in a division of an estate, when one heir wants to pass their own share (their inherited share) to someone else, or to arrange that they will "take nothing this time because they received enough during the deceased's life," two documents come up: the "assignment of an inherited share (a deed of assignment of inherited share)" and the "certificate of special benefit (proof that there is no inherited share; also called a certificate of nil inherited share or a certificate of non-existence of inherited share)." The former is a Civil Code act that transfers your own inherited share to another for value or gratuitously (Article 905 of the Civil Code presupposes assignment to a third party), while the latter shows that you have no inherited share because you received a special benefit (Article 903 of the Civil Code). They resemble each other, but differ in when they can be used, in tax, and in the later risk of dispute. This article is general information organising the roles of the two documents and how to use each; it does not judge the outcome of any individual registration, the tax amount or validity.

What is each document — the assignment of an inherited share and the certificate of special benefit — for?

The assignment of an inherited share is an act that transfers to another your proportional position in the whole estate (including both positive assets and negative debts). If you assign it to one of the co-heirs, that person's share increases and the parties to the division decrease. You can also assign it to a third party, but then the other co-heirs can exercise the "right to recover the inherited share" (see below). The certificate of special benefit, on the other hand, is a document proving that you have no inherited share because you received a special benefit.

Document	What it does	Main basis
Assignment of an inherited share (deed of assignment)	Transfers your inherited share (the proportional position combining positive and negative property) to another	Article 905 of the Civil Code (right to recover, premised on assignment to a third party)
Certificate of special benefit (certificate of nil inherited share)	Proves you have no inherited share because you received a special benefit	Article 903 of the Civil Code (inherited share of a person with a special benefit)

Both allow individual movement of rights without a "division agreement by all," but they differ: the assignment transfers the proportional position itself, while the certificate of special benefit shows the fact that "there was no inherited share from the start."

When can you register with a proof of no inherited share?

The certificate of special benefit has, in practice, been used as an attached document for inheritance registration. Where property is concentrated in one particular heir, the other heirs certify that "I received a special benefit and have no inherited share," affix their registered seal and attach a seal certificate; this can serve as an attached document for inheritance registration in place of a division agreement.

However, this is a document premised on "whether there really was a special benefit." If, in fact, there was no lifetime gift and the certificate is made only to simplify the procedure, it becomes a document with false content and can lead to a later dispute or a correction of the registration. Inheritance registration itself (acting as agent for the application, preparing the application form, and individual registration consultation) is the work of a judicial scrivener or lawyer, and our office does not do it. Please confirm with the judicial scrivener handling the registration the final judgement on which document allows registration. For the overall picture of inheritance registration, see How does inheritance registration proceed?. From 1 April 2024, inheritance registration became mandatory, and under Article 76-2 of the Real Property Registration Act an application is required within three years of learning of the acquisition.

For the assignment of an inherited share, what about tax on any gain and the caution over assignment to a third party?

First, the Civil Code points of caution. Where one co-heir assigns their inherited share to a third party before the division, the other co-heirs may recover it by reimbursing its value and the costs (the right to recover the inherited share; Article 905, paragraph 1 of the Civil Code). This right must be exercised within one month (same Article, paragraph 2). The purpose is to prevent a third party from joining the division and causing a dispute.

Tax treatment changes with the situation and is the domain of a tax accountant. In general, it is organised as: (1) a gratuitous assignment of an inherited share between co-heirs is handled within the framework of inheritance tax; (2) a gratuitous assignment to a third party who is not an heir may raise a gift-tax issue for the assignee; and (3) an assignment for value may give rise to capital-gains taxation for the assignor. But the conclusion changes with the facts. Before considering an assignment of an inherited share, always confirm the tax treatment with a tax accountant. This article does not provide tax consultation.

When does a certificate of special benefit "become a dispute later"?

The certificate of special benefit is convenient, but it can also spark disputes. The typical case is where the content does not match reality.

• Certifying "no inherited share" when there was in fact no special benefit (false content)
• Affixing a registered seal without understanding the meaning of the certificate (leading to a claim of mistake)
• Making it with only some heirs, and the others learning of it later and disputing it

These can develop into a redoing of the division agreement, cancellation or correction of the registration, or even a claim to a statutory reserved portion (the minimum share guaranteed to heirs other than siblings). Disputes over the validity of the document, or over the existence of a reserved portion or special benefit, are the domain of a lawyer. Our office provides only the preparation of documents based on the facts and general information on which document is appropriate; it does not represent or negotiate in disputes.

Who handles registration, tax and disputes?

The assignment of an inherited share and the certificate of special benefit are not complete with the drafting of the document alone; registration, tax and disputes follow. The roles are as follows.

• Preparing the deed of assignment of inherited share and the certificate of special benefit based on the facts, and organising the required documents → Yotsuba Administrative Scrivener Office (administrative scrivener)
• Acting as agent for the inheritance-registration application, preparing the application form, and individual registration consultation → judicial scrivener or lawyer
• Judging the tax treatment such as inheritance tax, gift tax and capital-gains tax → tax accountant
• Disputes over the reserved portion, the existence of a special benefit, or the validity of the document → lawyer
• Sale, appraisal and brokerage of inherited real estate → Yotsuba Real Estate Co., Ltd. (licensed real estate broker)

Registration is the work of a judicial scrivener or lawyer, tax of a tax accountant, and disputes of a lawyer, and our office does not do them. The sale of inherited real estate is handled by Yotsuba Real Estate Co., Ltd., a separate business from Yotsuba Administrative Scrivener Office, under a separate contract as an independent business (see Inheritance and real estate: general guide). Each field is on the premise that you contract separately with each qualified professional or counter as an independent business, and our office receives no referral fee. For the flow of engagement, see Engagement Flow; for fees, see Fee Schedule; and for our inheritance work, see Inheritance Procedure Support. For the difference from a division agreement, see Can you make a division agreement yourself?; and for the idea of special benefit and contribution, Basics of special benefit and contribution is also helpful.

FAQ

Q. Are the assignment of an inherited share and renunciation of inheritance the same?
A. No. Renunciation is a procedure of declaration to the family court that treats you as never having been an heir, and it has a three-month deadline in principle. The assignment of an inherited share is an act by which someone who has already become an heir transfers their inherited share (a proportional position that includes debts) to another; it is not a court procedure. Unlike renunciation, assignment does not automatically extinguish liability for inherited debts toward the outside. Please consult a lawyer or judicial scrivener on the individual choice.

Q. I was told to affix my registered seal to a certificate of special benefit. Is it safe to do so?
A. A certificate of special benefit (certificate of nil inherited share) is a serious document acknowledging that "I received a special benefit and have no inherited share." If you affix it when there was in fact no special benefit such as a lifetime gift, it becomes a document with false content, and later a dispute may arise by asserting mistake. Fully confirm the content and its meaning, and if in doubt, consult a professional before signing or sealing.

Q. If I assign my inherited share to a third party, can the other heirs take it back?
A. Yes. Where one co-heir assigns their inherited share to a third party before the division, the other co-heirs may recover it by reimbursing its value and the costs (Article 905, paragraph 1 of the Civil Code). But this right to recover must be exercised within one month (same Article, paragraph 2). Because the period is short, if you are considering exercising it, consult a lawyer early.

Q. Can I have you handle the inheritance registration too with these documents?
A. An administrative scrivener prepares the deed of assignment of inherited share and the certificate of special benefit based on the facts. Acting as agent for the inheritance-registration application, preparing the application form, and individual registration consultation are the work of a judicial scrivener or lawyer, and our office does not do them. Please confirm with the judicial scrivener handling the registration the final judgement on which document allows registration.

Sources (Primary Information)

• e-Gov Law Search, "Civil Code" (Act No. 89 of 1896), Article 903 (inherited share of a person with a special benefit), Article 905 (right to recover the inherited share), Articles 909 and 909-2 (effect of the division; withdrawal of deposits before the division) (accessed 2026-09-10)
• National Tax Agency, tax answers and Q&A examples (inheritance tax, gift tax, capital-gains tax; the way of thinking about tax on the assignment of an inherited share) (accessed 2026-09-10)
• Legal Affairs Bureau, guidance on the "application procedure for inheritance registration" (accessed 2026-09-10)
• e-Gov Law Search, "Real Property Registration Act," Article 76-2 (duty to apply for inheritance registration) (accessed 2026-09-10)

This article is general information and does not guarantee or judge the outcome of any individual registration, the tax amount or treatment, the validity of a document, or the existence of a reserved portion or special benefit. Which of the assignment of an inherited share or the certificate of special benefit should be used, and its effect, differ with the facts. Acting as agent for the inheritance-registration application, preparing the application form and individual registration consultation are for a judicial scrivener or lawyer; inheritance tax, gift tax and capital-gains tax and other tax treatment are for a tax accountant; disputes over the reserved portion or validity are for a lawyer; and the sale of inherited real estate is for Yotsuba Real Estate Co., Ltd. (licensed real estate broker), each as an independent business or jurisdiction, under separate contracts and procedures. 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.