Building-to-Land Allocation in Japanese Real Estate: Methods, Audit Risk, and Tax Impact

Status as of April 2026: In force. Only the building portion of a real estate purchase is depreciable in Japan. Allocation methods are accepted by the NTA based on the reasonableness test applied to each case per Consumption Tax Act Basic Directive 10-1-5 (Japanese) and NTA Tax Answer No. 6301 (Japanese); the most common benchmark is the fixed asset tax assessment ratio (固定資産税評価額). Last verified: 2026-04-18.

Note on currency: dollar conversions use an indicative rate of approximately ¥150 = US$1, rounded for readability.

Every Japanese real estate tax calculation begins with the same split: how much of the purchase price is building, how much is land. Because land is not depreciable and building is, this split is the single largest variable affecting annual depreciation. Understated building ratio, understated tax shelter. Overstated building ratio, audit exposure.

For the 4-year depreciation strategy on used wooden buildings, the allocation directly determines the annual deduction. On a ¥100 million purchase:

• 30% building = ¥30M building × 1/4 per year = ¥7.5M annual depreciation
• 50% building = ¥50M building × 1/4 per year = ¥12.5M annual depreciation
• 70% building = ¥70M building × 1/4 per year = ¥17.5M annual depreciation

At a 55% marginal rate, the difference between 30% and 70% building allocation is up to ¥5.5 million (approx. $37K) in annual tax savings — not a rounding error.

This article covers the three accepted methods, how to set the allocation defensibly, how the allocation echoes at sale, and the U.S. parallel for dual filers.

Why Allocation Matters — The Three Touch Points

The building-to-land split affects the tax return at three distinct points:

1. Annual depreciation (purchase and years 1 through N). Only the building portion is depreciated. Higher building ratio = larger annual deduction.

2. Capital gains at sale. The accumulated depreciation reduces the adjusted basis. A higher original building allocation means more depreciation was claimed, which means a larger gain at sale (taxed at 20.315% long-term, per the 5-year rule article).

3. Consumption tax (tax-registered sellers only). Land transfers are non-taxable under Consumption Tax Act Article 6, while building transfers are taxable. If the seller is a consumption-tax-registered business, the building portion bears the 10% consumption tax; the land portion does not. A higher building allocation therefore increases the consumption tax component of the total price. See also NTA Tax Answer No. 6301 (Japanese) on the taxable base for joint transfers.

For the typical foreign investor buying from an individual Japanese seller, point 3 is usually not relevant. Points 1 and 2 are always relevant.

The Three Accepted Methods

Consumption Tax Act Basic Directive 10-1-5 — the NTA’s formal guidance on land-and-building joint transfers — recognizes three methods of “reasonable allocation”: (1) fair-value allocation at the time of transfer, (2) allocation by inheritance tax or fixed asset tax assessment ratio, and (3) allocation by cost basis. Income tax and corporation tax follow the same reasonableness standard for deprecation basis purposes.

Method 1: Fixed Asset Tax Assessment Ratio (固定資産税評価額按分)

The most commonly accepted method. The municipal fixed asset tax assessment separately values building and land each year; the ratio between these two values is applied to the purchase price.

Building allocation = Purchase price × [Building fixed-asset assessment ÷ (Land + Building fixed-asset assessment)]

How to obtain the figures: the seller provides the fixed asset tax assessment certificate (固定資産税評価証明書), available from the local municipal office. For off-market luxury transactions, this document is typically included in the due diligence package; for other transactions, it can be requested from the seller.

Strengths:

• Objective basis, readily defensible on audit
• Produced by a municipal body, not the parties to the transaction
• No cost (beyond the request fee)

Weaknesses:

• Old buildings are often heavily depreciated in the assessment, producing a low building ratio even when the actual building has functional value
• Properties in high-land-value urban cores (central Tokyo, high-value districts of Osaka) often show depressed building ratios

Method 2: Explicit Allocation in the Purchase Agreement (売買契約書への明記)

The purchase contract specifies the building and land amounts directly. Whatever the contract specifies is generally accepted, within reasonableness.

Strengths:

• Direct contractual basis — the clearest possible documentation
• Allows buyer-seller negotiation to reach a mutually acceptable allocation
• Useful when the fixed-asset method would understate building value (e.g., heavily renovated older property)

Weaknesses:

• Seller-side incentives cut the opposite direction: higher building ratio means higher consumption tax (if seller is registered) and potentially higher capital gains recognition. Seller typically resists aggressive building allocation.
• Requires negotiation — not available on pre-priced listings without adjustment
• An allocation far outside market benchmarks (above 80–90% building) invites audit challenge even with contract basis

Method 3: Independent Appraisal (不動産鑑定評価)

A licensed real estate appraiser produces separate valuations for building and land.

Strengths:

• Authoritative professional valuation
• Useful for properties where the building has been significantly renovated or repositioned, producing value not reflected in fixed-asset assessments
• Most defensible method when aggressive allocations are needed

Weaknesses:

• Appraisal cost (typically ¥300,000–¥500,000, or $2K–$3.3K)
• Time required (several weeks for a full appraisal)
• Appraiser selection matters — reputable appraisers will not stretch valuations beyond defensible bounds

For ultra-luxury and unusual properties (heritage-converted buildings, mixed-use commercial-residential, properties with significant structural enhancements), the appraisal method is often worth the cost.

Audit Risk Boundaries

The NTA accepts allocations that can be defended on objective grounds. Allocations beyond defensible bounds get recomputed using the fixed asset ratio on audit, with resulting additional tax, interest, and delinquency penalty.

Practical zones:

For the 4-year wooden strategy, typical building ratios in the 40–70% range are common and defensible with either the fixed-asset method or contract + appraisal combination. Pushing to 80%+ requires serious documentation and is often not worth the marginal benefit relative to the audit risk.

How the Allocation Echoes at Sale

The allocation set at purchase does not disappear after the first tax return. It carries forward and shapes the capital gains calculation when the property is eventually sold.

Example. A ¥100M property purchased with 50% building allocation (¥50M building, ¥50M land). Depreciated fully over 4 years (¥50M total depreciation claimed). Sold in Year 6 at ¥100M.

• Adjusted basis at sale: ¥50M (land) + ¥0 (fully depreciated building) = ¥50M
• Taxable gain: ¥100M − ¥50M = ¥50M
• Long-term tax (20.315%): ¥10.16M (~$67K)

If the same property had been allocated 70% building at purchase (¥70M building, ¥30M land):

• Accumulated depreciation over 4 years: ¥70M (all of the building)
• Adjusted basis at sale: ¥30M (land) + ¥0 (fully depreciated building) = ¥30M
• Taxable gain: ¥100M − ¥30M = ¥70M
• Long-term tax: ¥14.22M (~$95K)

The higher building ratio produced ¥20M more depreciation over four years (deducted at 55% = ~¥11M extra tax savings) but ¥20M more taxable gain at sale (taxed at 20.315% = ~¥4M extra capital gains tax).

Net benefit of higher building allocation: ~¥7M on a ¥100M property. The rate arbitrage (55% deduction rate vs. 20.315% exit rate) is preserved in the trade-off. The higher the building allocation the investor can defensibly claim, the more rate arbitrage captured.

This is why building allocation is not neutral — higher, when defensible, is genuinely better on an after-tax basis.

The U.S. Parallel — IRS Publication 551

U.S. tax law handles the allocation question conceptually identically: only the building depreciates on the U.S. return, and the purchase price must be split between land and building by a reasonable method. IRS Publication 551 addresses the question directly.

Common U.S. methods:

• Property tax assessment ratio — the most direct U.S. parallel to Japan’s fixed asset tax assessment method. Uses the most recent property tax bill’s building-to-land ratio.
• Appraisal — an independent appraiser’s valuation, particularly for unusual properties.
• Insurance valuation — the building component of the insured replacement cost can provide a reasonableness check, though it is not directly a cost basis method.

Practical difference for dual filers. A U.S. person depreciating Japanese real estate on both returns faces the allocation question twice:

• Japanese return: allocation using Japanese 固定資産税評価額, contract, or appraisal
• U.S. return: allocation using U.S. methods (property tax ratio or appraisal)

The two allocations need not produce identical numbers, and typically do not. The U.S. property tax assessment for a foreign-located property is not directly available; U.S. filers usually rely on the Japanese fixed-asset certificate converted at a reasonable exchange rate, or a qualified appraisal.

The allocations run independently on the two returns. Japanese depreciation is computed against the Japanese building basis; U.S. MACRS depreciation is computed against the U.S. building basis; they do not reconcile. See the placed-in-service date guide for the broader dual-filer framework.

How to Get the Allocation Right

For foreign investors acquiring Japanese income property:

1. Request the fixed asset tax assessment certificate early. Before contract, ideally during due diligence. This sets the default baseline and informs negotiation.
2. Consider an appraisal for unusual properties. Heritage conversions, recent renovations, mixed-use buildings, and ultra-luxury single-family properties often have building value not reflected in municipal assessments.
3. Negotiate the contract allocation when beneficial. If the seller is a private individual (not consumption-tax registered), their incentive against high building ratios is weaker. A contract allocation between the fixed-asset ratio and a higher defensible figure can produce real tax savings.
4. Document the rationale at the time of acquisition. Even if the NTA does not audit the file for years, the supporting documentation should be preserved with the acquisition records.
5. Coordinate U.S. side from Year 1 if dual filing. The U.S. cost basis allocation should be established at acquisition, not reconstructed years later.

Related Reading

• 4-Year Depreciation on Used Wooden Buildings — the strategy this allocation powers
• Japan’s 5-Year Capital Gains Rule — how the allocation echoes at sale
• Japan Depreciation by Structure — building classification that runs parallel to allocation
• Japanese Real Estate Tax Basics for Foreign Investors

This article is for general informational purposes only and does not constitute tax advice. Consult a qualified tax professional for guidance on your specific situation. U.S. readers: per IRS Circular 230, nothing in this article may be used to avoid penalties under the Internal Revenue Code.