Separation can change the use of the primary residence, the ownership of the property, and the person who bears the expenses, but these changes do not all produce the same tax effects. You might wonder if leaving the home causes you to lose the tax relief obtained at purchase, who can use the remaining installments of a building bonus, or what happens to the photovoltaic system installed on the roof.
I want to help you distinguish between three operations that are often confused: the assignment of the family home, the transfer of ownership between spouses, and the sale to a third party. We will see why this distinction affects taxes, deductions, and the clauses to be included in the separation agreement. It is not enough to establish who will continue to live in the property: it is also necessary to clarify who remains its owner, who paid for the works, and which tax benefit was utilized.
Assignment, Transfer, and Sale Have Different Effects
Assignment does not transfer ownership. The measure that attributes the family home to a parent regulates the enjoyment of the residence, when conditions related to the protection of children are met. The other spouse can therefore continue to be the sole owner or co-owner, even if they leave the home and cannot use it freely.
Transfer, instead, modifies ownership. One spouse can assign the entire property or their own share to the other as part of the asset arrangement connected to the separation. A suitable legal title, the precise identification of the asset, and transcription in the real estate registers are required. From that moment, ownership, the power to dispose of the home, and certain tax consequences change.
The sale to a third party is different again. Both spouses exit the ownership relationship, while the destination of the price, the mortgage, the delivery of the property, and the fate of deductions not yet utilized must be regulated. The provision of the sale in the separation agreement does not automatically make any tax or previous tax obligation irrelevant.
The mortgage does not necessarily follow ownership. If one spouse purchases the other's share and undertakes to pay the installments, this agreement regulates the internal relations between them. The ceding spouse remains obligated to the bank until the institution accepts a release or a different modification of the contract.
When Separation Affects First Home Tax Relief
First home and principal residence are not synonyms. The former is a subsidized tax regime applied to purchase when the conditions provided by note II-bis of the Tariff attached to Presidential Decree 131/1986 on registration tax are met. The principal residence, on the other hand, is the home in which the person habitually dwells, according to the requirements requested by the individual tax discipline.
Physically leaving the dwelling does not cause forfeiture on its own. Among the conditions for the relief is residency in the Municipality where the property is located, to be transferred within eighteen months when not already present and when such a commitment has been declared in the deed. The rule does not generally require continuing to live forever specifically in the purchased home.
Obligations still pending, however, remain relevant. If the eighteen-month term has not expired, the spouse who undertook to transfer residency to the Municipality must also take this into account during separation. The marital crisis does not correct an originally false declaration and does not constitute, in every situation, an automatic exemption from the undertaking assumed.
Disposal within five years requires particular attention. In ordinary discipline, the onerous or gratuitous transfer of the property purchased with the benefit before the five-year mark can cause forfeiture. The benefit is normally preserved if, within one year of the alienation, another property to be used as a principal residence is purchased, in compliance with applicable conditions.
Residual ownership counts for a new purchase. The assignment of the home to the other spouse does not eliminate the share remaining in the estate. Before requesting the relief again, it is therefore necessary to compare actual ownership with the requirements relating to properties owned in the same Municipality and properties already purchased with the benefit, also considering any alienation commitment allowed by current discipline.
Transfers Included in the Separation Agreement
Acts genuinely connected to separation enjoy specific tax protection. Article 19 of Law 74/1987 provides an exemption for acts relating to the dissolution or cessation of the civil effects of marriage. Constitutional Court ruling 154/1999 extended this protection to all acts, documents, and measures relating to personal separation.
The connection must be effective and recognizable. It is not enough to execute a sale or a donation during the same period as the separation. The transfer must implement the regulation of family and financial relations: for example, it can contribute to defining maintenance, the division of common resources, or the housing arrangements of the spouses and children.
The transfer to the spouse can prevent first home forfeiture. Case law has traced the attribution of the home or share executed in fulfillment of separation conditions back to the management of the family crisis. The 2021 Tax Review of the Court of Cassation summarizes the orientation concerning both transfers between spouses and sales to third parties provided for by agreements.
The protection concerns the revocation of the original benefit, not a generic neutrality of every real estate operation. A sale to a third party, in particular, must be genuinely functional to the agreement and remains distinct from direct transfer between spouses. Furthermore, the exemption connected to separation does not cure inaccurate declarations or grounds for forfeiture already matured for reasons other than disposal.
The formulation of the agreement has concrete consequences. If the sale serves to extinguish the mortgage and divide the proceeds, this function must emerge. If one spouse transfers their share in exchange for the waiver of other economic claims, the attributed asset and the relationship with the overall financial regulation must be stated.
Building Bonuses: Who Uses the Installments After Separation
The deduction belongs to the person who incurs the expense and owns or holds the property on the basis of a title admitted by the individual incentive. Ownership, invoices, payments, and the timing of the execution of the works must be read together. Mere co-ownership does not prove that both spouses paid the same share of the interventions.
Expenses incurred in 2026 follow the rates prorogued for that year. For building recovery interventions, the limit is 96,000 euros per real estate unit; the deduction is 36 percent and rises to 50 percent for expenses incurred by the owner or holder of a real right of enjoyment on the unit used as a principal residence. The prorogation results from Article 1, paragraph 22, of Law 199/2025.
Assignment is not equivalent to a real right. The spouse who occupies the family home by virtue of the measure does not automatically become an owner, usufructuary, or holder of the right of use or habitation. Assignment can be relevant as a title of detention for access to ordinary discipline, if other requirements are met, but it is not enough on its own for the rate reserved in 2026 for owners and holders of real rights.
Installments already matured are not recalculated with 2026 rules. If a spouse paid for works in previous years, the deduction continues according to the rate and number of installments provided for the original expense. Separation does not automatically transfer the benefit to the other spouse and does not retroactively modify who bore the cost.
The sale can transfer residual installments. Article 16-bis, paragraph 8, of the TUIR establishes that, upon the sale of the real estate unit, the portion of deduction not utilized generally passes to the individual purchaser for the remaining tax periods, barring a different agreement. The choice to retain it with the seller must therefore be expressed and consistent with the deed.
Not every attribution in separation is a sale. A gratuitous disposal, a transfer with a solutory function, and a sale can have different qualifications. Before applying the rule on residual installments, it is necessary to identify the nature of the deed and the discipline of the bonus used, without relying on a generic clause regarding house expenses.
Photovoltaics: System Ownership, Deduction, and Contracts
Photovoltaics can fall under the renovation bonus. Article 16-bis, paragraph 1, letter h), of the TUIR includes interventions aimed at energy savings and systems based on renewable sources. The relief nevertheless requires compliance with the technical and fiscal conditions provided, correct payments, and documentation in the name of the subject bearing the expense.
The original benefit must be identified. The presence of panels on the roof does not allow, on its own, to establish which rules apply. The system may have been subsidized as a building recovery intervention or within the scope of a different incentive, possibly connected to other works. The fate of residual installments depends on this distinction.
System and deduction do not coincide. Panels, inverters, storage batteries, and permanently installed components can be included in the transfer of the residence, while the right to the installments follows the rules of the tax benefit. Whoever becomes the owner of the system does not necessarily acquire every deduction already matured by the subject who paid for the works.
Energy relations constitute a separate plan. The agreement must make it possible to update utilities, headings, guarantees, and positions relating to energy production or sale. The assignment of the home does not automatically modify these relations; the sale or transfer of ownership instead requires them to be coordinated with the material transfer of the system.
How to Coordinate Property and Tax Benefits
The first choice concerns ownership. Leaving it unchanged and attributing only enjoyment avoids an immediate transfer, but preserves co-ownership and the need to decide together on works, sale, and financing. Ceding the share simplifies ownership, but requires coordinating the value of the attribution, mortgage, and deductions.
The second choice concerns benefits already utilized. For each intervention, it is necessary to distinguish first home relief, renovation bonuses, photovoltaic incentives, and still available installments. A clause stating that one spouse will bear all future expenses does not necessarily establish who will keep a deduction originating from previous payments.
The third choice concerns future expenses. If the home remains common, it is useful to establish who can authorize interventions, who pays for them, and in whose name invoices and bank transfers must be made. If ownership is transferred before the works, the new owner must verify the requirements of the bonus applicable at the time of payment.
The order of operations can change the result. Paying for works before transfer, ceding the share, and then selling to a third party are not interchangeable steps. Date of expense, nature of the deed, paying subject, and destination of the residence determine which discipline to apply and which clauses are necessary.
Frequently Asked Questions
Do I lose first home tax relief if I leave the dwelling after separation?
Not automatically. Moving to another dwelling does not alone cancel the benefit obtained at purchase. Commitments still pending, however, remain to be respected, including the transfer of residency to the Municipality within eighteen months when declared in the deed of purchase, and any disposals within five years must be considered.
Can I buy another first home if I still own a share of the family home?
Assignment does not eliminate the share. The possibility of obtaining tax relief again depends on the rights owned, the Municipality where the properties are located, and any previous subsidized purchase. Before the new deed of purchase, actual ownership and any obligation to alienate provided by current discipline must be considered.
Who uses the installments of the building bonus after the sale to the spouse?
In sales, installments normally pass to the purchaser, barring a different agreement included in the deed. If the attribution provided by separation does not have the nature of a sale, the same conclusion cannot be applied automatically: it is necessary to distinguish the type of transfer, the original bonus, and the subject who bore the expense.
Can the assignee obtain the 50 percent renovation bonus in 2026?
Assignment alone is not enough. In 2026, the 50 percent rate requires the expense to be borne by the owner or holder of a real right of enjoyment on the principal residence. An assignee lacking such rights must verify whether they can access the ordinary 36 percent deduction and under what conditions.
Does the photovoltaic deduction always follow property ownership?
No, the incentive used must be identified. If the system was subsidized pursuant to Article 16-bis, the rule provided for residual installments of building interventions operates upon sale. Different provisions may apply for other incentives. System ownership, deduction, and the heading of energy relations remain connected but autonomous issues.
Before Defining the Transfer
A real estate clause produces effects beyond separation. It can impact first home relief, deduction installments, the mortgage, and the possibility of purchasing another property. For this reason, it is advisable to coordinate the family solution with the tax structure of the operation before signing, not after registration or sale.
If you need to choose between assignment, share transfer, and sale, you can contact us to clarify which operation corresponds to the agreement you want to reach and which real estate and tax aspects must result in the deed.