The Federal Supreme Court on the Distinction Between Personal and Business Assets in Real Estate Matters

Key Points in Brief
In its ruling of February 9, 2026 (9C_126/2024), the Federal Supreme Court had to determine whether a property held for several years and later sold was part of an entrepreneur’s personal assets or business assets. It upheld the heirs’ appeal and determined that the disputed property was part of the decedent’s personal assets. Consequently, the increase in value was not subject to taxation as a liquidation gain under Art. 18(2) of the Federal Income Tax Act (DBG), but remained tax-exempt as a personal capital gain under Art. 16(3) of the DBG.

The ruling is significant for tax practice because it further clarifies the distinction between private asset management and commercial real estate trading. Of particular note is the Federal Supreme Court’s statement that the intent to make a profit—which is required for self-employment—must relate to transaction gains. This must be distinguished from an investment strategy aimed at preserving and increasing private assets.

At the same time, the court notes that prior assessments for subsequent tax periods are generally not binding. Nevertheless, legal certainty and the principle of good faith may impose limits on the tax authority if a classification has been accepted over an extended period and the circumstances have not changed in a manner relevant from a legal perspective. The Federal Supreme Court left open whether this consideration alone would have been decisive in the specific case. However, it held that the long-standing tax treatment of the property as private assets is not insignificant in the overall assessment.

Background and Issue in Dispute
The proceedings concerned the 2016 direct federal tax. Until 2015, A.A. was self-employed through his sole proprietorship, E., and was also involved in business activities in several other companies. As part of succession planning, he transferred various equity interests and assets to his children via a contract of inheritance dated May 10, 2016, effective retroactively as of January 1, 2016. Among other things, he transferred the sole proprietorship E. and several properties—including the disputed property—to his daughter C.A. C.A. agreed to sell these within two years to pay off the sole proprietorship’s debts. The sale took place on December 19, 2016, for eleven million Swiss francs.

The Zurich Cantonal Tax Office classified the property as business assets. It assumed that the transfer under the contract of inheritance had triggered a private withdrawal, which is why the hidden reserves were to be taxed as liquidation gains. The heirs’ appeal and complaint were unsuccessful at the cantonal level. It was only before the Federal Supreme Court that they prevailed.

Consequently, the following legal provisions were of particular focus: Art. 16(3) of the Federal Income Tax Act (DBG) regarding the tax exemption of private capital gains, and Art. 18(2) of the DBG regarding the taxation of hidden reserves upon the transfer of business assets to private assets.

An Overview of the Specific Circumstances
The decedent had not acquired the disputed property in a single transaction. According to the findings in the judgment, the acquisition took place in several stages: In 1987, he first purchased an initial parcel for 1.2 million Swiss francs. In 1994, he acquired the adjacent parcel from a community of heirs for 890,000 Swiss francs. In 1996, access rights were reorganized as part of a mutual land exchange. Later, the decedent built two apartment buildings on the property, each with seven rental units. He thus held the property as an investment for a long time.

In 2016, as part of the family’s succession planning, the property was transferred to the daughter under a testamentary contract, with the condition that she sell the property within two years and use the proceeds to pay off the debts of the sole proprietorship E. The tax office viewed this, together with the previous development, the financing, and the decedent’s activities in the construction-related trade, as evidence of commercial real estate trading. It therefore calculated a substantial liquidation gain. The heirs, on the other hand, argued that the property had always served as an investment and retirement provision and had been treated for tax purposes as private assets for approximately thirty years.

This is how the Federal Supreme Court ruled on the case of
The Federal Supreme Court first outlined the relevant principles. Self-employment in the form of commercial real estate trading requires that the purchase and sale of real estate be carried out systematically and with the intent to make a profit. In contrast, the rental of one’s own real estate is considered private asset management even if the assets are extensive, professionally managed, and commercial books are maintained. The court cites the following as classic indicators of self-employment: a systematic and planned approach, frequent transactions, short periods of ownership, significant use of borrowed funds, a close connection to one’s professional activity, and the reinvestment of profits earned. However, an overall assessment is always decisive. None of these characteristics may be considered in isolation.

The court then addressed the heirs’ objection that the daughter had already been the owner under civil law at the time of the sale. This objection was of only limited help to the appellants. The Federal Supreme Court clearly stated that hidden reserves are realized when an asset is transferred from business assets to personal assets. This also applies when the transfer occurs through the division of an estate. Thus, if the real estate had been part of the business assets prior to the transfer, the withdrawal for personal use would have resulted in a taxable capital gain for the decedent, despite the daughter’s subsequent sale. The civil law ownership status in December 2016 was therefore not decisive. The previous classification of the real estate remained the decisive factor.

Various Lower-Court Decisions Overturned
‍Inits assessment of the individual pieces of evidence, the Federal Supreme Court overturned the lower court’s ruling on key points. With regard to the systematic approach, it held that neither the circumstances of the staggered acquisitions nor those of the sale suggested a strategy designed to realize a profit through resale. Rather, the acquisition of individual parcels had taken place as opportunities arose. In the court’s view, the subsequent divestment also tended to rule out commercial trading, particularly since the decedent, born in 1935, had long since reached retirement age at the time of the sales. The Federal Supreme Court therefore found no sufficient evidence that the specific sale had been part of a trading activity systematically aimed at capital gains.

The court also took a cautious view of the number of real estate transactions. The mere fact that there were eleven purchases and five sales over 28 years meant little on its own. What was decisive, rather, was how these transactions were spread out over time, how long the properties were held, and how the transactions related to the total assets invested.

In the Federal Supreme Court’s view, it was precisely this overall assessment that painted a picture of a long-term investment. Between 1984 and 1997, only purchases were made. No further properties were acquired after 2002. Apart from two earlier sales due to extenuating circumstances, a phase of divestment did not begin until 2012 and 2016. In the Federal Supreme Court’s view, this was more consistent with an age-related restructuring of assets than with ongoing real estate trading.

With regard to debt financing, the Federal Supreme Court acknowledged that a significant use of debt tends to indicate a business activity. However, it took issue with the lower court’s calculation, since the risk analysis must, in principle, be based on the circumstances at the time of the respective acquisition or investment. In the case of a new development, existing mortgages and construction loans could not be mechanically compared to historical investment costs from 1987 and 1994. The lower court had not sufficiently determined the relevant debt-to-equity ratios for the individual phases. Furthermore, the decedent’s diversified real estate portfolio tended to reduce the overall risk associated with the investment. A comparatively high proportion of debt therefore does not automatically indicate a willingness to take risks typical of commercial real estate trading. Even if a certain risk existed in this specific case, this alone does not establish that the activity constituted an independent business.

The Federal Supreme Court also largely rejected the argument that the transaction was related to the decedent’s professional activities. Although the decedent worked in the electrical industry—and thus in a related construction sector—this alone did not mean he possessed specialized knowledge of real estate trading. The fact that his company performed work on its own properties was also insufficient—given the lack of significant order volumes—to assume the existence of an infrastructure or a labor pool typical of the real estate trade. Nor did the establishment of a real estate company alter this conclusion, because it did not actually hold any properties.

An important clarification concerns the use of the proceeds from the sale. The lower court had concluded that the property served a direct business purpose based on the subsidiary’s obligation to use the proceeds to pay off the sole proprietorship’s debts. The Federal Supreme Court disagreed: Neither the property’s original designation as a retirement asset nor the subsequent use of the proceeds to pay off the business’s debts, taken in isolation, determines whether it is classified as personal or business property. Even a property classified as business property can serve as a retirement asset, and conversely, a personal asset can later be used to finance business objectives. What is decisive is not the isolated use of funds, but the overall economic context.

Therefore, this does not constitute commercial real estate trading
‍Atthe heart of its overall assessment, the Federal Supreme Court provided an important clarification. The intent to make a profit—which is required for commercial real estate trading—refers to income in the form of transaction gains from purchases and sales. This must be distinguished from systematic management aimed at preserving and increasing private assets. Even a private real estate portfolio can be purposefully built up, developed, and optimally utilized without this necessarily constituting self-employment. In this specific case, the Federal Supreme Court recognized the management of the property as a long-term investment rather than a trading activity aimed at realizing transaction gains. The circumstantial evidence pointed to the investment nature of the holdings, long-term ownership, and the generation of rental income.  

Finally, the Federal Supreme Court held that the fact that the assets had been treated as private assets for decades could not be disregarded without consequence. While a prior assessment does not have substantive legal effect for subsequent periods, However, in the case of alternative assets such as real estate, a tax treatment accepted over a long period of time may be significant from the perspective of legal certainty and good faith, provided that the relevant circumstances have not changed. This does not apply, however, if the prior classification was based exclusively on unverified information provided by the taxpayer and the tax authority should not have relied on it. In the specific case at hand, although the tax treatment of the real estate as private assets over several decades was not the sole determining factor, it was nevertheless taken into account in the overall assessment.

How the Ruling Affects Tax Practice
The rulingis relevant to tax practice forseveral reasons. First, it confirms the importance of a careful overall assessment. According to the Federal Supreme Court, individual factors such as development, debt financing, or professional ties to the construction industry are not sufficient if the overall picture indicates a long-term investment. Second, the ruling emphasizes that the private management of a real estate portfolio—even when organized professionally—can, in principle, remain private asset management. And third, it sets limits on the tendency of tax authorities to automatically conclude that the proceeds from a sale constitute business assets based solely on their subsequent use.

From a tax perspective, it is also important in practice to distinguish between capital gains and appreciation in value. The ruling makes it clear that not every increase in a property’s value and not every structural improvement amounts to commercial trading. Someone who holds real estate for the long term, rents it out, and sells it only as part of succession planning or asset reallocation is not, for that reason alone, engaged in self-employment. This applies even if individual circumstances appear to be business-related.

Conclusion
In conclusion, the ruling is compelling due to its methodological clarity. It serves as a reminder that the distinction between private and business assets must not be made schematically or based on individual pieces of evidence. Particularly compelling is the clarification that the intent to generate profits—as relevant under tax law—must relate to transaction gains. In doing so, the Federal Supreme Court reinforces the doctrinal distinction between private asset management and self-employment.