The 令和8年度税制改正大綱 (FY2026 Tax Reform Outline), published on 19 December 2025, introduced the most significant change to real-estate inheritance tax valuation in Japan in over a decade. For high-net-worth foreign buyers considering Chiyoda-ku (千代田区), Tokyo’s central ward where land prices routinely rank among the highest in the country, understanding the full tax stack before signing is not optional. This article sets out the current rates, the 2026 reform details, and the practical obligations that apply specifically to non-resident owners.

Fixed-Asset Tax and Urban Planning Tax in Chiyoda-ku for 2026

Every property owner in Japan’s 23 wards pays two annual levies on their real estate: 固定資産税 (kotei-shisan-zei, fixed-asset tax) at a standard rate of 1.4% of assessed value, and 都市計画税 (toshi-keikaku-zei, urban planning tax) at a ceiling rate of 0.3% of assessed value. Chiyoda-ku, as part of Tokyo’s 23-ward area, applies the full 0.3% urban planning tax rate. Both taxes are administered by the Tokyo Metropolitan Government (都税, to-zei), not by the ward office directly, and are levied on the owner of record as of 1 January each year.

The assessed value used for these calculations is not the same as market price. For land, the assessed figure is typically around 70% of the 路線価 (rosenka, road-frontage price) published annually by the National Tax Agency. For buildings, the assessed value is set by the municipality and generally reflects roughly 60% of construction cost at the time of the most recent reassessment cycle. In Chiyoda-ku, where prime residential land commands some of the highest rosenka figures in Tokyo, even a modest percentage reduction in assessed value translates to meaningful annual savings.

Residential Land Reduction: How the Tiers Work

Japanese property tax law provides a standing reduction on land used for residential purposes, with no scheduled expiry date. The reduction applies to the tax calculation basis, not to the rate itself:

• Land up to 200㎡ per unit (小規模住宅用地, small-scale residential land): fixed-asset tax basis reduced to 1/6 of assessed value; urban planning tax basis reduced to 1/3.
• Land over 200㎡ per unit (一般住宅用地, general residential land): fixed-asset tax basis reduced to 1/3; urban planning tax basis reduced to 2/3.

The eligible land area is capped at ten times the total floor area of the building above it. For a マンション (manshon, Japanese usage for a freehold condominium unit, not a detached mansion in the English sense) in Chiyoda-ku, the calculation is applied to each owner’s proportionate share of the site.

Residential Tax Reduction for New-Build Properties: Extended to March 2031

The FY2026 Tax Reform extended the 新築住宅減額措置 (shinchiku-jutaku-gengaku-sochi, new-build residential tax reduction) by five years, through 31 March 2031. Under this measure, the fixed-asset tax on the first 120㎡ of floor area is halved for a defined period after construction:

• General housing: 3 years
• Condominiums in buildings of three storeys or more with fire-resistant construction: 5 years
• 認定長期優良住宅 (nintei-chouki-yuuryou-jutaku, certified long-life quality housing): 5 years for general housing, 7 years for qualifying condominiums

One practically significant change in the FY2026 reform is the reduction of the minimum qualifying floor area from 50㎡ to 40㎡ per unit. Several new luxury developments in Chiyoda-ku include compact high-specification units in the 40–55㎡ range, typically marketed to single professionals or as pied-à-terre residences. These units now qualify for the halved-tax period, where they previously did not.

For a buyer purchasing a new condominium in Chiyoda-ku at a purchase price of ¥350 million, the assessed value of the building portion might be approximately ¥70–80 million after applying the standard ratio. A 50% reduction on the fixed-asset tax for five years represents a cumulative saving in the range of ¥490,000–¥560,000 over the benefit period, assuming no reassessment. Not a trivial figure, but it should be weighed against the full annual holding cost rather than treated as the primary decision variable.

For a broader look at land pricing and zoning specifics within the ward, the Chiyoda-ku Bancho guide covering land prices and zoning in 2026 sets out the sub-district level detail that matters at the point of site selection.

Registration Tax: Rates and Reductions for Foreign Buyers

登録免許税 (toroku-menkyo-zei, registration tax) is payable at the point of 登記 (touki, the transfer of legal title recorded at the Legal Affairs Bureau). The standard rate for a purchase-and-sale transaction is 2.0% of the assessed value of the property. This is distinct from the purchase price: for a ¥400 million property in Chiyoda-ku where the assessed value of the land and building combined is ¥180 million, the standard registration tax would be ¥3.6 million.

A reduced rate is available for qualifying owner-occupied residential housing, valid through 31 March 2027. Foreign buyers should confirm eligibility carefully. The reduction requires the buyer to occupy the property as their primary residence within a specified period after acquisition. Buyers who are not yet resident in Japan, or who intend to use the property as a secondary or investment residence, may not qualify and should budget at the standard 2.0% rate.

For buyers financing the purchase with a mortgage, the 抵当権設定 (teitouken-settei, mortgage registration) carries a separate registration tax at 0.4% of the loan amount. On a ¥200 million mortgage, that is ¥800,000 at the point of signing. Foreign nationals can access Japanese mortgage financing, though eligibility conditions vary significantly by lender and by the buyer’s visa status, income structure, and whether they hold 永住権 (eijuuken, Japanese permanent residency). Non-resident buyers typically face more restrictive terms or may be required to finance without Japanese leverage.

For inheritance, the registration tax rate drops to 0.4% of assessed value, which is one reason estate planning around Japanese real estate often involves holding structures designed to pass assets at assessed rather than market value.

Inheritance Tax Valuation and the Critical 5-Year Rule

This is the section that has changed most materially for 2026 and beyond.

Under the standard framework, land in urban areas is valued for 相続税 (sozoku-zei, inheritance tax) purposes using the 路線価方式 (rosenka-hoshiki, road-frontage price method). The rosenka figure for a given street, published annually by the National Tax Agency at rosenka.nta.go.jp, is multiplied by the land area and adjusted for shape, depth, and other correction factors. In Chiyoda-ku, prime residential locations carry rosenka figures that rank among the highest in Tokyo, but the rosenka itself is typically set at roughly 80% of market value, providing a built-in compression relative to what a buyer actually paid.

Buildings are valued at their 固定資産税評価額 (kotei-shisan-zei-hyouka-gaku, fixed-asset assessed value), which is equivalent to the inheritance tax assessed value on a 1:1 basis. That figure is generally around 60% of construction cost.

The combined effect is that a property purchased at market price has historically been valued for inheritance tax purposes at a meaningful discount to its acquisition cost, sometimes 30–50% lower depending on the asset type and location. This gap has been the basis of a widely used estate-planning strategy among high-net-worth families in Japan.

The 5-Year Rule: Effective 1 January 2027

The 令和8年度税制改正大綱 announced a structural change to close the most aggressive version of this strategy. From 1 January 2027, rental real estate acquired within five years before the date of inheritance or gift will be valued at a figure approximating 80% of market value, rather than the traditional rosenka or assessed-value basis. The intent is to price assets at something close to 時価 (jika, current market value) when the holding period is short.

For buyers acquiring property in Chiyoda-ku in 2026, the practical implication is straightforward: a property purchased today and held for more than five years before an inheritance event retains the traditional lower valuation basis. A property passed on within five years of acquisition will be valued at near-market price, eliminating most of the compression benefit.

A second provision in the same reform targets 不動産小口化商品 (fudosan-koguchika-shohin, fractional real-estate investment products, typically structured as TK/GK schemes). Regardless of holding period, these products will be valued at near-market price for inheritance and gift tax purposes from the same effective date. The compression advantage that made these products attractive for estate planning is eliminated.

For buyers whose estate planning has involved either short-hold rental property or fractional product structures, the window to restructure before the 1 January 2027 effective date is narrow. Decisions made in 2026 carry consequences that extend across the next decade.

Rental Property Valuation Discounts and the Small-Scale Land Exemption

For properties held for five or more years, the traditional valuation discounts remain intact as of April 2026.

贈家建付地 (shakka-tateitsuki-chi, land under a leased building) is valued using the following formula:

Assessed value × (1 − 借地権割合 (shakuchiken-wariai, land-lease right ratio) × 借家権割合 (shakken-wariai, leasehold right ratio) × 賃貸割合 (chintai-wariai, occupancy ratio))

The 借家権割合 is set nationally at 30%. The 借地権割合 varies by location and is published on the rosenka map: Chiyoda-ku prime locations typically fall in the C to D range, corresponding to 70% and 60% respectively. At 60% and 100% occupancy, a piece of land with an assessed value of ¥100 million is valued for inheritance tax at ¥82 million, an 18% reduction. At 70%, the reduction reaches 21%.

The 小規模宅地等の特例 (shoukibo-takuchi-tou-no-tokurei, small-scale residential and business land exemption) provides additional relief:

• Owner-occupied residence (特定居住用宅地等): up to 330㎡, 80% reduction in taxable value
• Rental property (貸付事業用宅地等): up to 200㎡, 50% reduction
• Business use (特定事業用宅地等): up to 400㎡, 80% reduction

The owner-occupied residential exemption is particularly powerful. A Chiyoda-ku property where the land portion is valued at ¥200 million for rosenka purposes, and the buyer qualifies for the 330㎡ exemption, would see the taxable land value reduced to ¥40 million. Qualification conditions include inheritance by a spouse or a co-resident heir, among other criteria. Foreign nationals who are tax residents of Japan at the time of the inheritance event may qualify, but the rules are fact-specific and require professional advice.

Koukyuu is a private buyer’s advisory focused exclusively on transactions of ¥300 million and above. At that transaction size, the difference between a well-structured and a poorly structured acquisition, measured in inheritance tax exposure over a ten-year horizon, can easily exceed the cost of the property itself. A licensed 宅建士 (takken-shi, Japan’s licensed real-estate transaction specialist) personally handles every stage of each Koukyuu engagement, including the 重要事項説明 (juuyou-jikou-setsumei, the statutory pre-contract disclosure meeting) where tax-relevant property characteristics are formally disclosed.

Chiyoda-ku Municipal Tax Administration for Non-Resident Foreign Owners

Owning property in Chiyoda-ku while residing outside Japan creates a set of administrative obligations that are easy to overlook and costly to ignore.

The most immediate is the requirement to designate a 納税管理人 (nouzei-kanri-nin, tax agent or representative) for local tax purposes. Non-resident property owners must appoint a Japan-based individual or entity to receive tax notices and make payments on their behalf. Without a designated representative, the Tokyo Metropolitan Government has authority to pursue collection through alternative means, including attachment of the property itself. The FY2026 resident tax notices for Chiyoda-ku (特別区民税・都民税, tokubetsu-kumin-zei/to-min-zei, the combined ward and metropolitan resident tax) were dispatched on 30 January 2026. From FY2026, Chiyoda-ku residents can file resident tax returns via electronic filing, a new capability that simplifies compliance for those with Japan-based advisors.

For owners who do become tax resident in Japan, resident tax is assessed on worldwide income in the year following establishment of residency. The transition from non-resident to resident status for tax purposes is not automatic upon visa issuance and is determined by a combination of physical presence, domicile intent, and registration. The point at which a foreign buyer crosses into Japanese tax residency has significant implications for income tax, gift tax, and inheritance tax exposure, and should be addressed before the property purchase closes.

For a detailed overview of the ward itself, including the residential sub-districts most relevant to foreign buyers, the Chiyoda-ku overview for high-net-worth residential buyers in 2026 covers the neighborhood geography and buyer profile in detail. Buyers also considering Minato-ku will find comparable analysis in the Minato-ku neighborhood guide for foreign residents covering Azabu, Roppongi, and beyond.

One final practical note: the 手付金 (tetsuke-kin, earnest-money deposit, typically 10% of the purchase price) is paid at the point of contract signing, before the registration tax and other closing costs fall due. On a ¥400 million Chiyoda-ku transaction, that is ¥40 million committed before the keys change hands. Foreign buyers unfamiliar with Japanese contract sequencing sometimes underestimate how quickly capital is deployed once a purchase agreement is executed.

Koukyuu is a private buyer’s advisory for distinguished Tokyo residences in Chiyoda-ku (千代田区), Roppongi Hills (六本木ヒルズ), and Nishi-Azabu (西麻布), focused exclusively on transactions of ¥300 million and above, with a licensed 宅建士 personally handling every stage from the first consultation through to signing. Book a private consultation) to begin a confidential conversation about your acquisition.