Inheriting the Family Home With Your Siblings──Why "Just Keep It in Joint Names for Now" Is the Riskiest Choice

In short: when siblings inherit the family home, deciding to "just put it in joint names for now" becomes harder to undo the longer it stands. Under joint ownership, every co-owner must agree before the property can be sold or rented out, and each subsequent inheritance adds more rights-holders. Start by discussing direction as a family, then divide the work: an Administrative Scrivener (行政書士) drafts the estate division agreement, a real estate company handles the appraisal and sale, a Judicial Scrivener (司法書士) handles the inheritance registration, and a Tax Accountant (税理士) handles tax matters — keeping each role separate is the safer way to proceed.

Why Do Families Default to "Just Share It for Now"?

When siblings inherit a family home, the first instinct is almost always the same: "let's just split it equally for now." No one wants to be the one who takes more and causes friction; no one wants to drag out the discussion; no one wants to talk about money in the middle of grief. Under the weight of these pressures, registering the property as jointly owned in the legally prescribed shares comes to look like the fairest, least confrontational answer.

During my years as a reporter, while covering the vacant-home problem, I once spoke with a woman whose family — she and her two sisters — had registered the family home in joint names. Right after the inheritance, she assumed there was no way the three of them would ever fall into conflict. Ten years later, each sister had gone through an inheritance of her own, and the number of co-owners had grown from three to seven — relatives who had never even met one another were now negotiating what to do with the house.

It is one example of how a decision made to preserve equality can lose its race against time. If you are still at the earlier stage of deciding whether to sell or keep the family home at all, see also our article on selling versus keeping the family home.

The Triple Burden Hidden Inside Joint Ownership

Trouble with joint ownership rarely surfaces right after the inheritance. It builds quietly over time. Joint ownership carries three burdens that grow heavier the longer they go unaddressed.

First, nothing can be sold or rented without every co-owner's consent. Under Japanese law, altering jointly owned property in ways that amount to disposal requires the agreement of all co-owners (Civil Code Article 251). If even one person says "I'm not ready to decide" or simply objects, the process stops regardless of what everyone else wants.

Second, each new inheritance splits the shares further. When one co-owner dies, that person's share passes down to their own heirs. With every generation, the number of co-owners branches outward, and reaching unanimous agreement becomes progressively harder. To address cases where a co-owner's whereabouts are unknown, a Civil Code amendment effective April 1, 2023 (Reiwa 5) introduced a system allowing procedures to move forward with court involvement (Civil Code Article 251, Paragraph 2, and Article 252, Paragraph 2). This is a remedy for the symptom, however — avoiding joint ownership in the first place remains the better course.

Third, disputes tend to arise over who is responsible for property tax, repair costs, and the burden of managing the property if it becomes a vacant home.

If discussions break down and someone wants to end the joint ownership through the courts, a legal procedure called a co-ownership partition claim (共有物分割請求) exists — but because this falls into contested, dispute-prone territory, it is a matter we would refer to a partner attorney.

Comparing the Three Ways to Divide the Family Home

Once a family decides to avoid joint ownership, there are three main ways to divide the property. None is inherently "correct" — which one fits depends on the family's circumstances.

Division in kind: physically dividing the real estate itself, such as by subdividing the land into separate parcels. This is often impractical for a single detached house, and essentially unavailable for a single condominium unit.

Compensatory division: one heir takes sole ownership of the property and pays the other heirs a cash settlement in exchange. This requires the heir taking the property to have substantial funds available.

Division by sale: selling the property and distributing the proceeds according to each heir's share. This looks the fairest on paper, but it runs counter to any wish to keep the family home in the family.

Whichever approach is used, determining a fair settlement or distribution amount depends on first establishing an accurate market value for the property.

What Steps Resolve Joint Ownership?

The process itself is simple.

1. Talk it through: start by having everyone share who wants to live there and who wants to sell.
2. Get an appraisal to put numbers on the table: sentiment alone will not move things forward. Only once you know the property's likely market value can you work out a compensatory-division payment or what a sale-and-divide would actually leave each heir.
3. Draft the estate division agreement (遺産分割協議書): this puts the outcome of the discussion into writing. Drafting this document is the exclusive statutory work of an Administrative Scrivener (行政書士), and Yotsuba Gyoseishoshi Office (四葉行政書士事務所) undertakes it under a separate contract.
4. Complete the inheritance registration: since April 1, 2024 (Reiwa 6), registering inherited real estate has been legally mandatory. The application must generally be filed within three years of learning the property was inherited; failing to do so without justified reason can result in a civil fine of up to ¥100,000 (Real Property Registration Act, Article 76-2, Paragraph 1, and Article 164, Paragraph 1). A partner Judicial Scrivener (司法書士) handles the registration filing on your behalf.
5. Choose an exit: sell, put the property to use such as renting it out, or maintain it for now. Leaving a property vacant and unmanaged can, following a municipal advisory, cause property tax to rise as much as sixfold (see our complete guide to vacant homes).

Tax matters — inheritance tax and any capital gains tax on a sale — are handled by a partner Tax Accountant (税理士). If you choose to sell, meeting certain requirements may allow you to deduct up to ¥30 million from the taxable gain under the special exemption for a decedent's residential property (空き家の3,000万円特別控除), available through December 31, 2027 (Reiwa 9) — though whether it applies to your case is something only a tax accountant can confirm.

Frequently Asked Questions

Q1. We've kept the property in joint names, and only one of us has been paying the property tax. Is that a problem?

As a general matter, co-owners are expected to bear costs in proportion to their ownership share. When one person covers the cost for an extended period, disputes over reimbursement tend to surface later and can strain relationships, so it is advisable to put the cost-sharing arrangement in writing early on. The right way to settle accounts varies by situation, so please confirm the details with a qualified professional.

Q2. Could one of my siblings sell just their own share to someone outside the family?

Generally speaking, a co-owner may transfer their own individual share unilaterally. This can result in someone you have never met becoming a co-owner, which is itself one of the risks that comes with joint ownership.

Q3. What happens if we don't complete the inheritance registration?

Since April 1, 2024, filing the inheritance registration has been legally mandatory. Failing to file within three years without justified reason may result in a civil fine of up to ¥100,000. Please confirm the details with the Legal Affairs Bureau or a partner Judicial Scrivener.

Q4. What if we can't reach an agreement?

Legal procedures exist, including estate-division mediation through the family court and a co-ownership partition claim. Because these fall into contested, dispute-prone territory, they are matters we would refer to a partner attorney.

What Yotsuba Real Estate Can Do

What we help with comes before the sale itself: the process of deciding. Based in Kohinata, Bunkyo-ku, we support your family's discussion starting with an appraisal that puts real numbers on the table. Drafting the estate division agreement is undertaken separately, under its own contract, by our affiliated Yotsuba Gyoseishoshi Office; registration is handled by a partner Judicial Scrivener; tax matters by a partner Tax Accountant; and any contested situation is referred to a partner attorney — each an independent professional handling their own piece. What sets us apart from an ordinary real estate agency is that we can walk alongside you from this early decision-making stage, showing you the numbers as we go. We are not a department store trying to handle everything under one roof — we are more like a row of independent shops on an old neighborhood street, pointing you, without hesitation, to the right specialist for each need.

It is fine if nothing has been decided yet. See also our complete guide to inherited real estate and our complete guide to vacant homes. For help with document drafting, contact Yotsuba Gyoseishoshi Office; for anything else, please get in touch.

This article is intended as general information. Judgments on individual legal matters have been, or should be, confirmed by a qualified professional.

What our company cannot handle: representation and negotiation in contested inheritance disputes (we will introduce an attorney); filing real estate registration on your behalf (undertaken by a partner Judicial Scrivener (司法書士)); and inheritance tax filing (undertaken by a partner Tax Accountant (税理士)). Licensed social insurance and labor consultant (社会保険労務士) services cannot be accepted until our office opens in September 2026. Each specialist is engaged under a separate, individual contract, and our company does not receive any referral fee.

Joji Uramatsu | Representative Director of Yotsuba Real Estate Co., Ltd. and Chief Licensed Real Estate Transaction Specialist. Administrative Scrivener (行政書士). Former Bureau Chief for China at The Mainichi Shimbun (34 years as a journalist), stationed in China, Taiwan, and Thailand. Passed the Certified Social Insurance and Labor Consultant Examination (office opening September 2026).