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Inheritance for Singles—What Happens to the Assets of Those Without Next of Kin

2026年7月26日 11:08

The growing number of "singles" and the fate of their assets

With rising lifelong non-marriage rates, a declining birthrate, and changing family dynamics, the number of "singles" without spouses or children is increasing every year.

This leads to a pressing question.

"What happens to the assets of a person who passes away without next of kin?"

In fact, knowing the answer makes it clear why singles, in particular, need to make preparations while they are still alive. In this article, we will outline the fate of these assets and the preparations you can make now.

First, confirm: Is there really "zero inheritance"?

Even if you think you have no next of kin, there are many cases where legal heirs exist. Let's re-examine the scope of heirs.

Even if you have no spouse or children, if you have siblings or their children (nieces and nephews), they are your heirs. Even if you haven't seen them in decades, their right to inherit remains valid.

The only time there is truly "zero inheritance" is when none of these relatives exist (or if they have all renounced their inheritance).

What happens to assets if there are no heirs?

If there are no heirs at all, the assets follow the process below.

Regarding the process of asset disposition

In other words, if you make no preparations, your assets will ultimately revert to the national treasury. In fact, it is said that assets entering the national treasury due to a lack of heirs are increasing every year, reaching a scale of 100 billion yen annually.

If you want to avoid your hard-earned assets being handed over to the state in a way you did not intend, expressing your wishes while you are alive is essential.

Relying solely on "special contributors" is risky

The "special contributors" mentioned in the table above refer to people who had a special connection to the deceased, such as common-law spouses or those who provided dedicated nursing care. If they file a petition with the family court and it is approved, they can receive all or part of the assets.

However, relying on this is dangerous.

Whether it is approved depends entirely on the court's judgment.
There is a deadline for filing the petition, and the procedural burden is significant.
Even if recognized, you are not guaranteed to receive the full amount

It is not the case that "everything will be fine because I have a long-term partner." If you want to ensure your assets are passed on, the will described below is the only certain method.

Preparation for Singles (1): A Will — Deciding the Destination of Your Assets Yourself

The pillar of inheritance planning for singles is a will.

With a will, you can decide the destination of your assets according to your own wishes, even if you have no statutory heirs.

Leave assets to people who have cared for you, partners, or friends (bequest)
Donate to NPOs, local governments, or your alma mater (bequest donation)
Ensure assets are left to specific relatives, such as nieces and nephews

Moreover, there is an advantageous aspect to wills for singles. Since siblings, nieces, and nephews do not have a legal reserve of inheritance (legal portion), the contents of your will are easily realized as written. If you write "all assets to so-and-so," it will generally be carried out as stated.

In addition, do not forget to appoint an executor of the will. Precisely because you do not have family members nearby to handle the procedures, appointing a professional or similar person as the executor is the key to ensuring your wishes are carried out.

Preparation for Singles (2): Preparing to Entrust "Post-Mortem Procedures"

For singles, there is the issue of not only where the assets go, but also who will handle the practical matters after death. Funerals, burial of remains, cleaning out the house, canceling contracts—if you have no family, there is no one to take on these tasks.

The system for this is a post-mortem administrative delegation contract. You can sign a contract with a trusted person or professional while you are alive to entrust various post-mortem procedures to them.

Furthermore, by combining this with a voluntary guardianship contract to prepare for when your decision-making capacity declines, and a mandate contract to request daily monitoring or asset management, you can ensure seamless preparation from "while you are healthy" to "after your decision-making capacity declines" and "after death."

Preparation for Singles (3): Making Information "Findable"

There is one more often-overlooked preparation. It is to ensure that information about your assets and wishes is in a state where it can be reliably discovered.

Create an inventory of assets (accounts, real estate, insurance, digital assets)
Ensure your will is in a form that is "guaranteed to be found," such as through the Legal Affairs Bureau's storage system or a notarized will
Write down contract relationships and your wishes in an ending note
Inform the person you have entrusted (legatee, executor, or post-mortem administrator) of the storage location

No matter how excellent a will may be, it is meaningless if it is not discovered. For those living alone, this perspective is crucial precisely because the assumption that "someone will notice" does not hold.

The final plan to ensure you "do not burden anyone"

Conversely, inheritance for those living alone is also an inheritance where you are not bound by anyone and can completely design the destination of your assets yourself.

If you do nothing, your assets will ultimately go to the national treasury
If you have a will, you can leave your assets as you wish (siblings have no legal portion)
With a mandate for post-mortem administrative tasks, you can entrust practical matters after your passing
Ensuring information is in a "discoverable format" is the prerequisite for everything

You are the only one who can decide the "final use of your assets." To your partner, to those who have cared for you, to society—how do you want to leave them? Why not start planning this while you are still healthy? We will also help you organize your end-of-life and inheritance preparations as a single person.

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