Missed the three months for renouncing an inheritance in Japan? Extending the deliberation period and when the clock starts

In short: the three-month deliberation period for renouncing an inheritance runs from the time you learn the inheritance has begun for you (Civil Code Article 915(1)). If you cannot decide in time, you may ask the family court to extend it, and even after it passes the start of the clock can exceptionally shift. Preparing the filings and petitions to the family court is outside an administrative scrivener's scope.

Sources checked: 23 October 2026. This article focuses narrowly on when the clock starts and on the extension petition, for heirs at around the three-month mark and heirs who later discover debts. For the overall system see the basics of renunciation and qualified acceptance; for how to investigate debts and guarantees see investigating inherited debts and guarantee obligations. The provisions were reconciled with e-Gov.

When does the three-month "deliberation period" start?

Civil Code Article 915(1) provides that an heir must, within three months from the time they learn the inheritance has begun for them, make a simple acceptance, a qualified acceptance or a renunciation. These three months are the deliberation period. In practice, the key point is that the clock starts not from "the date of death" but from "the time the heir learns the inheritance has begun for them."

The heir's situation	When the clock starts	Basis
An ordinary heir	When they learn the inheritance has begun for them	Civil Code Article 915(1)
The heir dies without accepting or renouncing (re-transferred inheritance)	When that person's own heir learns the inheritance has begun for them	Civil Code Article 916
The heir is a minor or an adult ward	When the legal representative learns of the inheritance	Civil Code Article 917

If the period passes and the heir has neither made a qualified acceptance nor renounced within it, they are deemed to have made a simple acceptance (statutory simple acceptance; Civil Code Article 921(ii)). A simple acceptance means succeeding to the decedent's rights and obligations without limit (Civil Code Article 920). Under Civil Code Article 915(2), an heir may investigate the estate before accepting or renouncing.

If three months is not enough, can the period be extended?

In some cases, yes. The proviso to Civil Code Article 915(1) provides that, at the request of an interested party or a public prosecutor, the family court may extend the deliberation period. It is used where the estate spans many items and takes time to investigate, or where the full picture of debts cannot be grasped.

Item	Content
Who may petition	Interested parties (including heirs) and the public prosecutor
Where to file	The family court for the decedent's last domicile
When to petition	In principle, within the three-month deliberation period
Basis	Proviso to Civil Code Article 915(1); Domestic Relations Case Procedure Act Article 201

The extension petition is, in principle, made before the deliberation period expires. Whether an extension is granted and by how long is for the family court to decide. An immediate appeal may be filed against a ruling that dismisses the extension petition (Domestic Relations Case Procedure Act Article 201(9)). Confirm the procedural details in the court's guidance.

If debts come to light after the period passes, can you no longer renounce?

Not necessarily. The Supreme Court judgment of 27 April 1984 set out an exception on when the clock starts. Where an heir believed the decedent had no estate at all and had reasonable grounds for so believing, the deliberation period runs from the time they recognised the existence of all or part of the estate, or the time they could normally have recognised it.

On this view, even where more than three months have passed since the death, if the heir learns of a debt afterward, the start of the clock may have shifted later, leaving room to renounce. But this is an assessment for each case, and one cannot categorically assert either that "you can always renounce once three months have passed" or that "you never can." Whether it applies depends on the facts — when the heir learned of the debt, how the investigation proceeded, and so on. For the outlook where a large debt comes to light later, consult a judicial scrivener or an attorney.

Note that once a renunciation is made, it cannot be withdrawn even within the deliberation period (Civil Code Article 919(1)). Rescission on grounds such as mistake or fraud is allowed separately, but the right to rescind is extinguished by prescription six months from when ratification becomes possible, or ten years from the renunciation (Civil Code Article 919(3)).

Who may prepare the renunciation filing or the extension petition?

A renunciation is made by filing a declaration with the family court (Civil Code Article 938). Once the filing is accepted, the person is deemed never to have been an heir with respect to that inheritance (Civil Code Article 939). An extension of the deliberation period is likewise made by petition to the family court.

The point to note here is the difference in who may act. Preparing documents submitted to the family court — the declaration of renunciation and the extension petition — is outside an administrative scrivener's scope. These are handled by a judicial scrivener or an attorney. An administrative scrivener handles investigating the estate and debts, assisting with the estate inventory, and preparing the estate-division agreement.

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Document / procedure	Who prepares / represents
Declaration of renunciation	Judicial scrivener / attorney
Petition to extend the deliberation period	Judicial scrivener / attorney
Negotiation with creditors; inheritance disputes	Attorney
Investigating the estate and debts; assisting with the estate inventory	Administrative scrivener

Who do you engage for investigation, filing and disputes? (Separating the engagements)

The deliberation period is short, and investigating and filing proceed at the same time. The basic approach is to separate the roles and engage each with the deadline in mind.

Who to engage	Scope
四葉行政書士事務所	Investigating the estate and debts; assisting with the estate inventory and the estate-division agreement
Judicial scrivener / attorney	Preparing the renunciation declaration and the extension petition to the family court
Attorney	Negotiation with creditors; inheritance disputes
Judicial scrivener	Inheritance registration
Tax accountant	Estimating and filing inheritance tax

Preparing the declaration and petition submitted to the family court is outside an administrative scrivener's scope. 四葉行政書士事務所, 四葉社会保険労務士事務所 and 四葉不動産株式会社 are each a separate, independent business. You contract with each field's provider separately as an independent business, and each provider bills and receives payment directly. Our office receives no referral fee.

See inheritance-procedure support, the engagement process and the fee schedule. The sale of inherited real estate is handled by the separate business at inherited real-estate consultation, which you also contract with separately.

FAQ

Q. Do the three months run from the date of death?
A. No. They run from the time you learn the inheritance has begun for you (Civil Code Article 915(1)). The start can vary with when you learned of the death or learned you had become an heir. A re-transferred inheritance (Article 916) and a minor or adult ward (Article 917) have separate rules on when the clock starts.

Q. What do I do if I cannot decide within three months?
A. You may petition the family court for the decedent's last domicile to extend the deliberation period (proviso to Civil Code Article 915(1); Domestic Relations Case Procedure Act Article 201). In principle you petition within the three-month period. Whether it is granted, and by how long, is for the family court to decide.

Q. Once three months pass, can I no longer renounce?
A. Not categorically. The Supreme Court judgment of 27 April 1984 held that the clock shifts where you believed there was no estate at all and had reasonable grounds for so believing. Whether it applies is case-specific, so consult a judicial scrivener or an attorney for the outlook.

Q. Can an administrative scrivener prepare the renunciation documents?
A. Preparing the declaration and petition submitted to the family court is outside an administrative scrivener's scope and is handled by a judicial scrivener or an attorney. An administrative scrivener investigates the estate and debts and assists with the estate inventory and the estate-division agreement.

Sources (Primary Information)

• e-Gov: Civil Code (1896 Act No. 89): Article 915(1) (deliberation period and the extension proviso) and (2) (estate investigation), Article 916 (re-transferred inheritance), Article 917 (minor / adult ward), Article 919 (withdrawal/rescission and the rescission period), Article 920 (effect of simple acceptance), Article 921 (statutory simple acceptance), Article 938 (declaration of renunciation), Article 939 (effect of renunciation). Final amendment dates are unverified.
• e-Gov: Domestic Relations Case Procedure Act (2011 Act No. 52): Article 201 (adjudication cases on acceptance and renunciation; immediate appeal against dismissal of the extension petition). The exact appended-table item number is unverified.
• Courts: declaration of renunciation of inheritance and extension of the period for acceptance or renunciation: who declares/petitions, the court for the decedent's last domicile, the three-month deliberation period (referenced 2026-10-23).
• Supreme Court judgment of 27 April 1984 (case no. Shōwa 57 (o) 82; Minshū vol. 38 no. 6 p. 698; on when the deliberation period starts). The full text was not obtained, and its scope is unverified.

Checked 2026-10-23. The provisions were reconciled with e-Gov. The scope of the 1984 Supreme Court judgment, the appended-table item number in the Domestic Relations Case Procedure Act, and the final amendment dates of each law are unverified. Reconfirm with the family court's latest guidance before proceeding.

This is general information and does not guarantee the choice between acceptance and renunciation, when the deliberation period starts, whether an extension or renunciation is granted, or a procedural outcome. Individual judgements are made by a qualified professional after reviewing the materials. Written by Joji Uramatsu, administrative scrivener and licensed real-estate transaction specialist.