"You can write the building off as an expense," people say — and that mechanism is depreciation. Use it without understanding it and you may feel ahead while holding the property, yet find yourself taxed in a lump at sale and worse off overall. The right approach is to design useful life, tax saving and exit as one connected line.
1. What depreciation is
A building is treated as losing value over time, so its acquisition cost is split across its useful life and booked each year as an expense (depreciation). Land does not depreciate and is excluded; only the building and equipment can be depreciated. This is the first key point: even for the same ¥100M property, "building ¥80M / land ¥20M" and "building ¥40M / land ¥60M" allow wildly different annual expenses. Because the building–land split in the sale contract drives the tax effect, acquire with the breakdown in mind. Buildings today (acquired from April 2007) use the straight-line method, booking roughly the same amount (cost ÷ useful life) each year.
2. Statutory useful life by structure (residential)
| Structure | Statutory useful life |
|---|---|
| Wood | 22 years |
| Light-gauge steel (≤3mm) | 19 years |
| Light-gauge steel (3–4mm) | 27 years |
| Heavy steel (S) | 34 years |
| Reinforced concrete (RC) | 47 years |
The shorter the life, the larger the yearly depreciation and the stronger the short-term tax effect. For a ¥44M building, wood (22 yrs) gives ¥2M a year, RC (47 yrs) about ¥0.94M — wood expenses "fast and thick," RC "slow and thin." Buying second-hand changes this: a property past its statutory life is recalculated at "useful life × 20%," and one partway through at "(life − years elapsed) + elapsed × 20%," shortening the period sharply. That is exactly why old wooden houses are popular for tax saving.
3. How the tax saving works
Depreciation's defining trait is that it is an expense with no cash going out. The actual spending ended at purchase, yet an expense posts every year on the books — so you compress taxable income without reducing your cash on hand. Deduct it from property or business income and your income and resident taxes fall. The effect is large for "someone with a high building price and other high income." Conversely, for those with low income, or land-heavy properties that generate little depreciation, the benefit is slight. Judge it by weighing your own income level against the building ratio of the property.
4. Corporate vs individual purchase
The name on the title changes how the tax bites. An individual faces progressive rates (income tax up to 45%, effectively ~55% with resident tax), so the higher the income the larger the compression — but loss offsetting against other income is limited. A company has a relatively flat rate, a longer loss-carryforward period than individuals, and more freedom to book expenses such as director pay and insurance. As a rule of thumb: incorporate when holding large scale, long-term, multiple properties; stay individual for one-off, small holdings. Setup and upkeep cost money too, so find the break-even by scale and holding years.
5. Use by high earners and overseas owners
Those with high salary or business income can use depreciation to flatten the peaks of taxable income. A non-resident (overseas owner) is likewise taxed in Japan on income from Japanese property and can depreciate in the same way. But rent is first withheld at 20.42% and reconciled by tax return, and foreign tax credits and treaty application in the home country come into play, so it must be designed on two tiers — Japan and home. The mechanism is the same as for individuals, but the procedural complexity is a different order, making a tax accountant effectively a prerequisite.
6. Watch-outs at exit (sale)
This is the most overlooked pitfall. The acquisition cost used to compute the gain on sale is not the price you paid but the "book value" — acquisition cost minus accumulated depreciation. In other words, every yen you expensed through depreciation while holding lowers the book value, and by that much the gain is computed larger and the transfer tax rises. Depreciation is less a "tax saving" than a deferral — pushing tax from the holding years to the sale. That is why it pays to ride past five years' holding into the favourable long-term rate, and to model book value and expected sale price from the outset — draw the exit at the entrance.
Depreciation is not "magic tax saving" but a tool for deferral and income smoothing. Choosing the structure (RC or wood) is tied not only to comfort and durability but directly to tax strategy. Always confirm specific figures with a tax accountant.