Japan's inheritance tax tops out at 55% — one of the highest rates in the world. Yet the ultra-wealthy almost never pass on their assets as cash. The reason is simple: inheritance tax is levied not on market value but on the "inheritance tax assessed value." Converting cash into real estate or unlisted company shares shrinks the very yardstick used to tax you. This article breaks down why the classic structures — asset management companies, holding companies and real estate — reduce the tax bill, and where the Supreme Court drew the line by striking down the famous "tower condo" scheme under General Rule 6, based on National Tax Agency primary sources.
The basic principle: tax follows assessed value, not market value
For inheritance tax, assets are converted into yen figures using the NTA's Basic Circular on Property Valuation. The gap between asset types is striking.
| Form of asset | How it is assessed | Rough % of market value |
|---|---|---|
| Cash and deposits | Face value | 100% |
| Listed shares | Market price (choice of recent 3-month averages) | Nearly 100% |
| Vacant land (own use) | Roadside land value (about 80% of official prices) | About 80% |
| Rental apartment land and buildings | Leased-land discounts plus buildings at fixed-asset-tax value | About 50–70% |
| Unlisted shares (family company) | Circular formulas (comparable industry / net asset methods) | Can fall far below, depending on the company |
100 million yen in cash is taxed as 100 million yen, but the same amount converted into a rental property is often assessed at 50–70 million yen. Changing the form of an asset changes the yardstick — that is the starting point of virtually all wealthy-family estate planning. For the basics (the basic deduction of 30 million yen + 6 million yen per statutory heir), see our guide to the inheritance tax basic deduction.
Method 1: Convert to real estate — the more you rent out, the lower the value
Real estate compression works in three layers.
- Land is assessed at roadside value, about 80%.
- Renting cuts it further. Land under a rental building is valued at "own-use value × (1 − leasehold ratio × 30% tenancy ratio × occupancy)". In a district with a 70% leasehold ratio that is roughly a 21% cut. Buildings are assessed at fixed-asset-tax value (typically 50–60% of construction cost), minus another 30% when rented.
- Small residential land special measure. If requirements are met, a home lot is reduced by 80% up to 330m², rental-business land by 50% up to 200m². Land first rented out within 3 years of death is excluded (an anti-last-minute rule).
The "tower condo" rules have changed. High-floor units, whose assessed value averaged only about 40% of market price, were the classic play. For condos acquired by inheritance or gift on or after January 1, 2024, a new formula corrects the gap: units assessed below 60% of market level are pulled up to at least about 60% of market value. Compression survives, but far weaker than before.
Method 2: An asset management company — turning wealth into unlisted shares
When a wealthy family sets up a private asset management company, the estate is no longer the real estate or securities themselves but the unlisted shares of the company.
- Unlisted shares are valued by formula. Depending on company size, the "comparable industry method" (benchmarks listed peers on dividends, profit and net assets, then multiplies by a discount factor of 0.7 / 0.6 / 0.5) is combined with the net asset method. A company that keeps dividends and profits modest can carry a much lower share valuation.
- Shares are easy to divide and gift — one share at a time, year after year, unlike a building.
- Income can be spread by paying family members directors' remuneration during the founder's lifetime.
Kabushiki kaisha (KK) or godo kaisha (GK)?
| Stock company (KK) | LLC-type company (GK) | |
|---|---|---|
| Set-up cost | From about 200,000 yen | From about 60,000 yen |
| On death | Shares pass to heirs as normal estate property | Membership interest does NOT pass to heirs unless the articles of incorporation say so (Companies Act Arts. 607–608) |
| Watch out | Ongoing maintenance costs | If the sole member dies without such a clause, the company is dissolved (Art. 641) and heirs inherit only a repayment claim valued on a net-asset basis — sometimes a higher value than the shares would have been |
Method 3: A holding company — freezing the founder's share value
For business owners the largest asset is usually their own company's stock. In the classic scheme, the successor sets up a holding company that borrows to buy the operating company's shares from the founder. The founder's estate stops growing (future appreciation accrues inside the holding company), and the holding company repays the loan out of dividends.
There is a dedicated anti-avoidance test: if shares make up 50% or more of total assets, the company is classed as a "share-holding specified company" and must generally be valued by the costlier net-asset method. Diluting the ratio with other assets — so-called kabutoku-hazushi — is common, but tax examiners can disregard purely cosmetic, last-minute asset shuffles.
Separately, the Business Succession Tax Scheme (special measure) defers 100% of inheritance/gift tax on qualifying shares. The deadline for filing the special succession plan has been extended to September 30, 2027 (the transfer itself must happen by December 31, 2027 — check the SME Agency's official pages for the latest).
Method 4: Use time — gifts and life insurance
- Annual gifts: 1.1 million yen per recipient per year is gift-tax free. Since 2024, however, the "add-back" of pre-death gifts to the estate is being extended from 3 to 7 years in stages (fully 7 years for deaths from 2031; a 1 million yen total exclusion applies to the extended 4 years).
- Settlement-at-inheritance taxation gained its own new 1.1 million yen annual basic deduction in 2024 — gifts within it are not added back at all.
- Life insurance: death benefits enjoy a tax-free allowance of 5 million yen × number of statutory heirs.
The limit: the Supreme Court's April 19, 2022 ruling
Everything above follows the valuation circular. But the NTA holds a trump card — General Rule 6: where circular-based valuation is "markedly inappropriate," the assets can be revalued by other means, such as a real-estate appraisal.
Late in life, the decedent borrowed over 1 billion yen to buy two condominium buildings for about 1.4 billion yen. The heirs valued them at about 330 million yen under the roadside-value rules and, after netting the debt, filed almost zero inheritance tax. The NTA applied General Rule 6, revalued the properties at appraisal value (about 1.27 billion yen) and assessed over 200 million yen in additional tax. The Supreme Court sided with the government, finding the purchases were made in anticipation of the imminent inheritance for the purpose of cutting tax.
The practical lesson: asset conversions carried out (1) shortly before death, (2) with heavy borrowing, and (3) with no real purpose other than tax savings risk being struck down. The 2024 condo valuation rules are the system's follow-up to this ruling. Also remember the non-tax risks: illiquidity (inheritance tax is due in cash within 10 months), family disputes over hard-to-divide assets, and running costs of companies and buildings.
FAQ
Q. Does an asset management company always reduce inheritance tax?
A. No. As profits and net assets accumulate, the share valuation rises, and maintenance costs can outweigh the savings for smaller estates. For modest estates, the standard tools — gifts, life insurance, the small residential land measure — are usually better.
Q. Is tower-condo tax planning dead?
A. Weakened, not dead. Condos acquired from January 2024 are assessed at no less than roughly 60% of market value, leaving about a 40% compression. Last-minute, debt-financed purchases still risk denial under General Rule 6.
Q. KK or GK for an asset management company?
A. A GK is cheaper to set up, but unless its articles of incorporation provide for succession of the membership interest, heirs cannot inherit the member's position — and a sole-member GK is dissolved on death. If you use a GK, a succession clause in the articles is essentially mandatory.
Q. Where is the line for "going too far"?
A. There is no bright-line amount. The Supreme Court emphasized the combination of timing close to death, heavy borrowing, and the absence of purposes other than tax savings. Long-term investment and succession planning are far safer; always consult a tax professional.
Sources
- NTA: Basic Circular on Property Valuation (Japanese)
- NTA: Valuation of residential condominium units — Tax Answer No. 4667 (Japanese)
- NTA: Small residential land special measure — Tax Answer No. 4124 (Japanese)
- NTA: Settlement-at-inheritance taxation — Tax Answer No. 4103 (Japanese)
- SME Agency: Business Succession Tax Scheme (Japanese)