The capital gain on real estate is calculated based on the difference between the selling price and the acquisition price of a property. The resulting tax amount directly depends on the number of years of ownership, as progressive deductions reduce the taxable base over time. Understanding how to count these years allows for precise anticipation of the tax implications of a sale.
Starting point for the duration of ownership: the date that really matters
The calculation of ownership years is based on a pivotal date: the acquisition date of the property. For a standard purchase, this is the date of the authentic deed signed at the notary’s office, not the date of the sales agreement or the date of key handover.
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The most common confusion concerns properties received through donation or inheritance. In both cases, the duration of ownership does not start from the date of the donation or death, but from the acquisition date by the donor or the deceased.
An apartment bought by a parent twenty years ago and then transferred by donation thus retains this prior date for the calculation of deductions. This mechanism can add many years to the count and radically change the amount of tax owed.
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For a deeper understanding of the precise counting and its specific cases, Detectis Immo’s resources detail the method step by step.
The end date corresponds to the date of sale, that is, the signing of the authentic deed of transfer. The number of years of ownership is calculated from date to date, in complete years. A year that has started is not counted: a property acquired on March 15, 2015, and sold on March 10, 2026, totals ten full years, not eleven.
Deductions grid for duration of ownership: income tax and social contributions
Deductions do not follow a single rate. Two distinct grids apply: one for income tax, another for social contributions. The rates of reduction differ, meaning that the total exemption from income tax occurs before that of social contributions.
Deductions applicable to income tax
No deductions apply during the first five years of ownership. From the sixth year onward, a deduction applies for each year of ownership beyond the fifth. The total exemption for income tax is reached after twenty-two full years of ownership.
Deductions applicable to social contributions
The mechanism is similar but slower. The annual deduction for social contributions is lower than that for income tax during the initial years. The total exemption from social contributions occurs after thirty years of ownership. Between twenty-two and thirty years, the seller no longer pays income tax but remains liable for social contributions on the residual capital gain.
This distinction is the main source of error in manual estimates. Many sellers believe they are completely exempt after twenty-two years, while there are still several years before they no longer pay anything at all.
Severance and reunification: the trap of resetting the counter to zero
The severance of property (separation between usufruct and bare ownership) raises a common question: does the duration of ownership reset to zero when the bare owner regains full ownership upon the death of the usufructuary?
The answer is no. Administrative doctrine admits that the bare owner retains the prior ownership duration during reunification. The count of years continues uninterrupted from the initial acquisition date of the bare ownership right. This point is crucial for family properties held for a long time in severance.
For a usufruct acquired separately, the duration of ownership runs from the acquisition date of that specific right. The two rights (usufruct and bare ownership) do not retroactively merge their counters.
Practical method for calculating the net capital gain after deduction
Here are the steps to follow to obtain the taxable amount:
- Determine the gross capital gain by subtracting the acquisition price (increased by the flat acquisition costs and the amount of eligible works) from the selling price (reduced by the transfer costs).
- Count the number of full years of ownership between the acquisition date (authentic deed) and the sale date, remembering to refer back to the acquisition date of the donor or deceased if the property was received by donation or inheritance.
- Apply the deductions grid for income tax to the gross capital gain, then separately apply the deductions grid for social contributions, to obtain two distinct taxable bases.
- Calculate the tax amount on each base at the corresponding rate.
A point often overlooked: works whose cost has already been deducted from rental income (in the context of a rental investment) cannot be added to the acquisition price for calculating the capital gain. Counting the same works twice is a classic adjustment.
Case of the primary residence and other exemptions related to ownership
The sale of the primary residence remains exempt from any taxation on the capital gain, regardless of the duration of ownership. The calculation of years does not apply in this specific case.
For secondary residences and rental properties, the duration of ownership is the main tax lever. Two situations deserve attention:
- A property held for more than twenty-two years no longer generates income tax, but social contributions remain due up to thirty years.
- Beyond thirty years of ownership, the capital gain is completely exempt, with no steps required.
- A surtax may be added when the net taxable capital gain exceeds a certain threshold, even with deductions for the duration of ownership already applied.
The precise counting of ownership years, particularly for properties transferred by donation or held in severance, remains the variable that weighs most heavily on the final tax bill. Checking the date on the original acquisition deed, rather than relying on the transmission date, can represent savings of several thousand euros.