The value of real estate assets cannot be read from a purchase deed. It is calculated based on updated market data, adjusted by parameters that most online estimates ignore: legal discounts, the impact of the energy performance diagnosis (DPE), and the weighting of liabilities. Here, we detail the technical steps that separate a reliable valuation from a mere ballpark figure.
IFI Discount and DPE: Adjustments that Raw Estimates Do Not Capture
Any serious asset estimation begins with the market value of each property, then applies adjustments. It is on these adjustments that the most significant discrepancies between an amateur evaluation and a tax or legal usable calculation are determined.
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The tax administration has tightened its assessment of applicable discounts for the IFI through updates to the BOFiP database in 2023 and 2024. Flat-rate discounts without market justification are now contested. A property occupied free of charge, held in contentious co-ownership, or dismembered can no longer systematically apply a standard reduction: concrete comparative elements must be produced (recent transactions on similar properties with equivalent constraints).
The other variable that heavily weighs on valuation is the energy performance diagnosis. Since the gradual implementation of rental bans for properties classified as G and then F (Climate and Resilience Law, implementing decrees 2023-2025), notaries have observed a measurable discount on energy-inefficient properties. A rental property classified as G that can no longer be rented mechanically loses part of its asset value, as its ability to generate rental income is suspended or eliminated.
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We recommend addressing these two parameters before any aggregation: apply the DPE discount to the property in question, then check if a legal discount (dismemberment, ongoing lease, co-ownership) accumulates or substitutes.
Net Real Estate Assets: Calculation Method and Liabilities to Include
Gross assets have only limited interest. What matters for a wealth decision (sale, transfer, debt restructuring) is the net real estate assets, which is the difference between the corrected market value of your assets and all your associated liabilities.
To understand how to calculate your real estate assets with Spy Immo, the logic remains the same: start from an updated market value, subtract the debts, and obtain an exploitable balance.
The liabilities to include are not limited to the remaining capital owed on your loans. Here are the items we often see omitted:
- Early repayment penalties (IRA) if a sale is considered in the short term, as they reduce the net sale proceeds.
- Mandatory energy compliance works to maintain a property for rental (energy audit, insulation, heating system replacement).
- Estimated inheritance taxes when the calculation is used to prepare a transfer, as they decrease the net value passed on to heirs.
- Exceptional co-ownership charges voted or foreseeable (facade renovation, roof repair) that affect resale value.
Omitting a single liability item skews the asset debt ratio and can lead to erroneous decisions, particularly regarding the relevance of retaining a loss-making rental property.
Algorithmic Estimation or Field Expertise: Comparative Reliability
Automated estimation models (AVM, for Automated Valuation Models) have multiplied since 2023. Platforms like PriceHubble or Meilleurs Agents integrate these algorithms directly into banking and wealth management processes.
Their accuracy is deemed sufficient for preliminary portfolio evaluations. However, the Order of Notaries has taken a position in 2023-2024 to emphasize that these models remain insufficient for tax or inheritance decisions. The reason is technical: an AVM works on geolocated comparable transaction data but does not capture the actual condition of the property, easements, or legal particularities (commercial lease, occupation without title, dismemberment).
In practice, we observe that combining both approaches yields the most reliable results:
- The AVM provides a quick starting range, useful for an initial sorting in a multi-property portfolio.
- Physical expertise (notary, certified land expert) refines the value by incorporating discounts and premiums that the algorithm ignores.
- The intersection of both allows for the detection of anomalies: a property for which the AVM gives a value significantly higher than the field expertise often hides an issue not visible in the data (structural defect, neighborhood nuisance, unfavorable urban planning project).
For assets exceeding the IFI threshold, we systematically recommend a field expertise on each property, even if an AVM has already been used. The cost of the expertise is marginal compared to the risk of tax reassessment due to an undervaluation or poorly documented overvaluation.
SCPI Shares and Indirect Investment Vehicles
SCPI shares pose a specific valuation problem. Their withdrawal value (set by the management company) does not always correspond to the realization value (revalued net asset). For calculating net assets, the realization value better reflects the actual economic value than the withdrawal value, which includes amortized subscription fees.
Shares of property SCIs, on the other hand, should be valued based on the revalued net asset of the company, reduced by an illiquidity discount if the shares are not easily transferable.
Revaluation Frequency and Data to Monitor
A fixed asset calculation loses its relevance within a few months in a moving market. The frequency of revaluation depends on usage: an IFI declaration requires an annual update on January 1, but wealth management monitoring benefits from being quarterly for the most volatile assets (SCPI, properties located in areas undergoing significant correction).
The data to monitor as a priority are local price indices published by notaries, rental vacancy rates in the sector, and regulatory developments on the DPE. A property that shifts from an E class to an F in DPE can lose several points of value within weeks if a rental ban comes into effect.
Calculating real estate assets is not a one-time exercise. It is a dashboard that updates, corrects, and adjusts with every change in legal, tax, or physical parameters affecting your properties.