Four legislative changes affecting foreign property buyers in Japan took effect or were formally announced in the first quarter of 2026 alone. For a high-net-worth buyer acquiring a ¥400 million condominium in Minato-ku (港区), each one carries direct financial or legal consequence. This guide works through the full due diligence sequence, with particular attention to the rules that most English-language resources still have not caught up with.

What Has Changed in 2026, and Why It Matters at Closing

The most consequential near-term change is the 令和8年度税制改正大綱 (FY2026 Tax Reform Outline), which restructures how rental real estate is valued for 相続税 (souzoku-zei, inheritance tax) purposes. Under the incoming rule, a rental property acquired within five years prior to the date of inheritance or gift will no longer be assessed at 路線価 (rosenka, the published road-frontage price) or 固定資産税評価額 (kotei-shisan-zei hyouka-gaku, the fixed-asset assessed value). Valuation will instead reference the acquisition price at 80% of cost, substantially narrowing the gap between tax-assessed value and market price that investors had historically used to reduce estate exposure.

The rule applies to inheritances and gifts occurring on or after 1 January 2027. Calendar year 2026 remains under the old framework, which has already produced a documented surge in acquisition activity for qualifying rental assets. Buyers considering income-producing property in Aoyama (青山) or Nishi-Azabu (西麻布) should factor this into their holding-period analysis before signing.

A second layer applies to 不動産小口化商品 (fudousan koguchi-ka shouhin, fractional real estate investment products). These are treated more strictly: no five-year window applies, and market-price valuation governs regardless of acquisition date. Any buyer being pitched fractional structures as an estate-planning vehicle should be aware that the NTA has effectively closed that route.

One further caution: transactions in 2026 that are clearly tax-motivated remain exposed to 総則6項 (sousoku roku-kou, General Rule 6 of the 財産評価基本通達), which permits the National Tax Agency to substitute market-value assessment where standard valuation produces a grossly inappropriate result. The Supreme Court affirmed this power in its April 19, 2022 ruling on tower-condominium tax avoidance. The 2026 rush to acquire before the new rules take effect will attract scrutiny.

Separately, the マンション通達 (manshon tsuutatsu, the NTA’s revised condominium valuation circular) has been in force since 1 January 2024. For luxury Tokyo マンション (manshon, Japanese usage: freehold condominium, not ‘mansion’ in the English sense) units where the ratio of market price to assessed value exceeds a statutory threshold, a correction multiplier now applies. For a high-end investment condominium acquired within five years of an inheritance event, both the マンション通達 correction and the incoming five-year rule can apply simultaneously, producing a double adjustment.

The Registry Obligations Foreign Buyers Must Now Meet

Two amendments to the 改正不動産登記法 (Amended Real Property Registration Act) are directly relevant to foreign owners.

The first, 相続登記義務化 (souzoku touki gimu-ka, mandatory inheritance registration), took effect on 1 April 2024. Heirs must complete 登記 (touki, the transfer of legal title recorded at the Legal Affairs Bureau) within three years of learning of their inheritance and their acquisition of ownership. The obligation is retroactive, covering pre-2024 inheritances where registration remains outstanding. Non-compliance carries an administrative fine of up to ¥100,000.

The second amendment, 住所・氏名変更登記義務化 (juusho-shimei henkou touki gimu-ka, mandatory address and name-change registration), took effect on 1 April 2026. Registered owners must now update their address or name in the registry within two years of any change, including international relocation or a passport name change following marriage. The fine for non-compliance is up to ¥50,000. For foreign buyers who may relocate between countries during their holding period, this is a practical obligation that requires a system: a Japanese address for registration purposes, and a reliable local contact to monitor and action changes. Appointing a 納税管理人 (nozei kanrinin, tax agent, legally required under the Income Tax Act for non-residents receiving Japanese-source income) does not substitute for this registration requirement.

The broader context: approximately 24% of Japan’s total land area now has unidentifiable owners, a figure the Ministry of Land, Infrastructure, Transport and Tourism projects will reach roughly 7.2 million hectares by 2040. The mandatory registration reforms are the legislative response. For a buyer acquiring an older building or one being sold by an estate, a thorough 登記簿謄本 (touki-bo touhon, certified registry extract) review and title chain verification is not optional due diligence. It is the foundation of the transaction.

Taxes at Acquisition, Holding, and Exit

Foreign buyers frequently arrive with an accurate picture of the purchase price and an incomplete picture of the tax stack around it. The following figures apply as of April 2026.

At acquisition: 不動産取得税 (fudousan shutoku-zei, real estate acquisition tax) is assessed at 3 to 4% of the fixed-asset assessed value and is billed three to six months after closing. It does not appear at the settlement table, which means buyers who budget only for closing-day costs are routinely surprised. 登録免許税 (touroku menkyo-zei, registration and license tax) runs 0.4 to 2.0% of assessed value and is paid at closing. At holding: 固定資産税 (kotei-shisan-zei, fixed-asset tax) is levied at 1.4% of assessed value, which the Tokyo Metropolitan Government resets every three years (next revision: 2027). 都市計画税 (toshi-keikaku-zei, city planning tax) adds up to 0.3% of assessed value and applies across virtually all of the 23 wards, which fall within 市街化区域 (shigaika-kuiki, urbanization promotion zones). For land up to 200 m² per dwelling unit, the 小規模住宅用地 (shokibo jyuutaku-yochi, small-scale residential land special measure) reduces the 固定資産税 base to one-sixth of assessed value and the 都市計画税 base to one-third. Land above 200 m² receives reductions of one-third and two-thirds respectively. At exit: Capital gains are taxed at 39.63% for properties held five calendar years or fewer (short-term), and 20.315% for properties held more than five calendar years (long-term). Japan measures holding period by calendar year, not by anniversary date. A property purchased in November 2024 and sold in January 2030 does not meet the long-term threshold; the calendar-year count begins on 1 January of the acquisition year.

For non-residents receiving rental income, 20.42% of gross rent is withheld at source. Filing a 確定申告 (kakutei shinkoku, annual tax return) allows deduction of 減価償却 (genka-shokyaku, depreciation), management fees, 固定資産税, and loan interest, typically reducing the effective rate substantially. This filing is not automatic. Non-residents must appoint a 納税管理人 before the first rental payment is received.

The Foreigner-Specific Documentation Stack

Japan’s closing process requires a 印鑑証明書 (inkan shoumeisho, registered personal seal certificate) from resident buyers. Non-residents cannot obtain one. The accepted substitute is a signature certificate issued by a notary in the buyer’s home country, accompanied by an Apostille authentication. Depending on jurisdiction, the notarization and Apostille process takes two to four weeks. Buyers who underestimate this timeline create closing delays.

The 重要事項説明 (juuyou-jikou-setsumei, the statutory pre-contract disclosure meeting) is the formal session at which a licensed 宅建士 (takken-shi, Japan’s licensed real-estate transaction specialist) reads through the property’s legal disclosures before the contract is signed. This meeting is mandatory under the 宅地建物取引業法 (Real Estate Brokerage Act). For foreign buyers, the practical question is whether the takken-shi conducting the meeting is the same person who has been advising them throughout the transaction, or a specialist brought in only for the statutory formality. The distinction matters: a takken-shi who has been present since the due diligence phase will have already reviewed the 登記簿謄本, the 管理規約 (kanri-kiyaku, condominium management rules), the 修繕積立金 (shuuzen tsumitate-kin, long-term repair reserve fund) balance, and the building inspection records. One appearing only at signing will not. The Takken-Shi Role in Japan: What Every Foreign Buyer Must Understand in 2026 covers this distinction in detail.

For a full walkthrough of the 重要事項説明 process and what to expect at each stage, see Juyou Jikou Setsumei Explained: Japan’s Mandatory Property Disclosure for Foreign Buyers.

Mortgage Access for Non-Residents and Visa Considerations

Japanese domestic lenders apply significantly tighter criteria to non-resident and non-citizen borrowers than to Japanese nationals with permanent employment. As of April 2026, the majority of major city banks, including Mizuho, SMBC, and MUFG, require 永住権 (eijuuken, Japanese permanent residency) or Japanese citizenship for standard residential mortgage products. Some regional banks and credit unions will lend to holders of long-term visas (engineer/specialist, intra-company transferee, spouse of Japanese national), but at lower loan-to-value ratios, typically 50 to 70% of assessed value, and with shorter amortization periods.

Buyers without permanent residency who require financing typically work with international private banks operating in Japan, or with the Tokyo branches of their home-country institutions. Loan-to-value ratios for non-resident buyers at the ¥300 million and above tier generally range from 50 to 60%, with rates in 2026 reflecting the Bank of Japan’s gradual policy normalization since early 2024. Buyers should obtain a financing indication letter before submitting a 買付証明書 (kaitsuke shoumeisho, letter of purchase intent), since the 手付金 (tetsuke-kin, the earnest-money deposit, typically 10% of the purchase price) is at risk if financing falls through after contract execution without a valid financing contingency.

Visa status also affects exit planning. A buyer on a business manager visa whose company dissolves, or an employee on an intra-company transferee visa whose assignment ends, may face a compressed timeline for decisions about the property. Building a clear exit scenario into the initial due diligence, including a realistic estimate of achievable sale price and capital gains tax liability at various holding periods, is standard practice for sophisticated buyers. Japan Property Purchase Timeline: A Step-by-Step Guide for Foreign Buyers in 2026 maps the full sequence from initial brief to title transfer.

Building-Level Due Diligence: What the Registry Does Not Show

For マンション units, the 登記簿謄本 confirms ownership and encumbrances. It does not reveal the financial health of the building. The 修繕積立金 balance is the most common blind spot. Older buildings in Shirokane (白金) or Roppongi Hills (六本木ヒルズ) with deferred maintenance programs may carry reserves that are technically positive but structurally inadequate against the next major repair cycle. A buyer acquiring a unit in a building whose reserve fund is underfunded by, say, ¥50 million against projected elevator replacement and exterior waterproofing costs in the next decade is acquiring a contingent liability that does not appear on any public document.

The 管理規約 governs what owners may do with the unit: short-term rental restrictions, renovation rules, subletting permissions. In premium buildings, these rules are often more restrictive than the buyer expects. A buyer intending to let the property on a corporate lease while overseas should verify the 管理規約 explicitly permits it before paying the 手付金.

For older buildings, the applicable seismic standard is material. Buildings constructed before June 1981 were designed to the 旧耐震基準 (kyuu taishin kijun, old seismic standard). Those completed after that date meet the 新耐震基準 (shin taishin kijun, new seismic standard), which requires resistance to an earthquake of upper 6 on the Japanese seismic intensity scale. A third tier, the 2000年基準 (2000-nen kijun, 2000 standard), applies to wooden structures permitted after June 2000. For concrete condominium buildings in central Tokyo, the 1981 cutoff is the operative threshold. Buildings that predate it can still be acquired, but require an independent structural assessment and carry implications for mortgage availability and eventual resale.

The Ministry of Finance FAQ on real property acquisition by foreign nationals confirms that Japan imposes no blanket restriction on foreign ownership of land or buildings, though the April 2026 nationality-reporting requirements for large-scale land transactions by corporations are now active.

Koukyuu is a private buyer’s advisory for distinguished Tokyo residences in Roppongi Hills (六本木ヒルズ), Azabudai Hills (麻布台ヒルズ), Nishi-Azabu (西麻布), and Shirokane (白金), focused exclusively on transactions of ¥300 million and above, with a licensed 宅建士 (takken-shi) personally handling every stage from initial consultation through 登記, a continuity most Tokyo agencies do not provide. Book a private consultation) to begin a confidential conversation about your acquisition brief.