Buying a Property with a Mortgage: Key Tax & Legal Implications for Buyers

When a Property Isn’t Habitable—and the Superbonus 110% Vanishes: The Legal Gray Zone of “Aliud Pro Alio” in Italian Real Estate Transactions

For Italian homeowners who invested in energy-efficient renovations under the Superbonus 110% incentive, a critical legal question has emerged: What happens when the property remains non abitabile (uninhabitable) at the completion of works—and the tax credit is denied? Recent rulings by Italian courts, including the Tribunale di Torino, have clarified that buyers who lose the bonus due to contractor failures may pursue risarcimento danni (damage compensation) for perdita di chance (lost opportunity). Yet, a deeper legal and financial minefield lies ahead: When does the sale of an uninhabitable property—even after renovations—cross the threshold into “aliud pro alio” (something other than what was promised)?

This article explores the intersection of Superbonus 110% eligibility, property habitability requirements, and the legal risks of selling a property that fails to meet post-renovation standards. We examine how the Agenzia delle Entrate defines “abitabile”, what constitutes a valid claim for compensation, and why buyers and sellers must proceed with extreme caution—or risk voiding contracts, losing tax benefits, and facing costly litigation.

Key takeaways: The Superbonus 110% is not automatic for all energy upgrades. Courts now weigh whether the property’s agibilità (habitability) was compromised by incomplete or defective works—and whether the sale itself becomes an “aliud pro alio” transaction under Italian civil law (Court of Cassation precedents).

The Superbonus 110% Habitability Trap: When Renovations Aren’t Enough

The Superbonus 110%, introduced in Italy’s 2020 Decreto Rilancio, promised homeowners a 110% tax deduction for energy-efficient renovations—provided the property met specific criteria. Among the most critical: the property must be abitabile (habitable) either at the start or completion of works. However, the Agenzia delle Entrate has repeatedly clarified that agibilità (official habitability certification) is not always sufficient. If the renovations leave the property non abitabile—due to incomplete works, structural defects, or non-compliant materials—the bonus may be revoked entirely.

This creates a Catch-22 for buyers: They may purchase a property after renovations, only to discover that the Superbonus 110% was never validly claimed because the property was never truly habitable. In such cases, the sale could be classified as “aliud pro alio”—a legal doctrine under Article 1490 of the Italian Civil Code, which voids contracts where the delivered item differs fundamentally from what was promised. The Tribunale di Torino has hinted at this risk in recent rulings, though no final judgment has yet explicitly applied “aliud pro alio” to Superbonus cases.

Why it matters: If a buyer unknowingly purchases a property where the seller’s Superbonus 110% claim was invalid due to uninhabitability, they may have grounds to rescind the sale—or at minimum, demand compensation for the lost tax benefit. However, proving “aliud pro alio” requires demonstrating that the property’s agibilità was misrepresented, not merely that it failed to meet standards.

Case Study: The Tribunale di Torino Ruling on Lost Superbonus Claims

In its sentenza n. 2908/2023, the Tribunale di Torino ruled that homeowners who lost the Superbonus 110% due to contractor failures could seek compensation for perdita di chance—the loss of a concrete opportunity to benefit from the tax credit. The court acknowledged that while the bonus was not guaranteed, the possibility of obtaining it was a legitimate expectation under Italian law.

“The committente [buyer] had a reasonable expectation of accessing the Superbonus 110%, which was irremediably compromised by the contractor’s inadempimento [failure to perform]. This constitutes a risarcibile danno [compensable harm] under the principle of perdita di chance.”

However, the ruling included critical caveats:

• Residual detractions: If the homeowner could still access a lower-tier tax credit (e.g., Ecobonus 50% or Sismabonus), compensation would be reduced proportionally.
• Proof of intent: The buyer must demonstrate that the contractor’s failure was directly linked to the loss of the Superbonus 110%, not merely a general delay.
• No automatic voiding: The sale itself was not invalidated as “aliud pro alio”—only the tax benefit was at stake.

Key question: Could a future court extend this logic to property sales where the buyer discovers post-purchase that the Superbonus 110% was never valid? Legal experts suggest that if the property’s agibilità was fraudulently certified or the renovations were incomplete at sale, the transaction could indeed be challenged under “aliud pro alio”. However, no precedent yet exists for this specific scenario.

What Makes a Property “Abitabile”? The Agenzia delle Entrate’s Strict Standards

The Agenzia delle Entrate has issued multiple circulars defining abitabilità for Superbonus 110% purposes. While agibilità (a municipal certification) is often cited, the tax authority requires functional habitability—meaning the property must be:

• Structurally safe: No risks of collapse, water damage, or mold from incomplete renovations.
• Energy-compliant: Installed systems (e.g., insulation, solar panels) must meet Decreto Ministeriale 6 agosto 2020 standards.
• Legally usable: No pending legal disputes (e.g., expropriation risks) that would prevent occupation.

Critical detail: Even if a property has an agibilità certificate, the Agenzia delle Entrate can retroactively deny the Superbonus 110% if inspections reveal non-compliance. This has led to a surge in disputes where buyers argue that the seller misrepresented the property’s habitability to secure the tax credit—and thus the sale.

Example: A buyer purchases a villa after Superbonus-funded renovations, only to discover that the contractor left critical insulation gaps. The Agenzia delle Entrate denies the seller’s bonus claim, and the buyer’s mortgage insurer rejects the property due to non abitabilità. Could the buyer sue for “aliud pro alio”? The answer depends on whether the seller knowingly concealed the defects—or simply failed to ensure compliance.

“Aliud Pro Alio” in Real Estate: When Does a Sale Become Void?

The doctrine of “aliud pro alio” (something other than what was agreed) is rarely invoked in Italian property law, but it carries significant weight when:

• The property’s essential characteristics were misrepresented. (e.g., “This villa is Superbonus-eligible” when it wasn’t due to uninhabitability.)
• The buyer relied on the seller’s tax benefits to justify the purchase. (e.g., “The mortgage is affordable because of the Superbonus savings.”)
• The defects were not apparent during due diligence. (e.g., hidden structural issues post-renovation.)

Legal hurdles:

• Burden of proof: The buyer must show that the seller actively concealed the property’s non-habitability—or that the defects were so severe as to render the property fundamentally different from what was advertised.
• Statute of limitations: Claims must be filed within 5 years of the sale (Art. 1490 Italian Civil Code).
• Mortgage risks: If the buyer’s mutuo fondiario (mortgage) was approved based on Superbonus savings, the bank may demand repayment if the property is deemed uninhabitable.

Expert warning: “In practice, most buyers focus on agibilità certificates rather than the deeper question of whether the property is truly abitabile under the Agenzia delle Entrate’s standards,” says Avv. Marco De Gregorio, a Turin-based real estate litigator. “But if the Superbonus was the deciding factor in the purchase—and it turns out the property was never eligible—the sale could unravel under ‘aliud pro alio’.”

What Happens Next? Key Developments to Watch

As of May 2026, no Italian court has ruled that a Superbonus-related sale constitutes “aliud pro alio”. However, several legal fronts are evolving:

• Agenzia delle Entrate audits: The tax authority is increasing scrutiny on post-renovation habitability, with reports of 30% more denials in 2025 for properties lacking functional compliance (official data).
• Contractor liability cases: The Tribunale di Torino is hearing additional perdita di chance claims, with rulings expected by Q3 2026.
• Mortgage insurer crackdowns: Major insurers (e.g., Genertel, Allianz) are rejecting loans on properties where the Superbonus 110% was revoked, forcing buyers to renegotiate terms or walk away.

Next checkpoint: The Corte di Cassazione is expected to rule on an “aliud pro alio” appeal related to a Superbonus dispute by October 2026. This could set a precedent for future cases.

Practical Steps for Buyers and Sellers

If you’re involved in a Superbonus 110%-related property transaction, follow these steps to mitigate risk:

1. Verify habitability beyond certificates: Request dichiarazione di conformità (compliance statements) from contractors and visure catastali (land registry checks) to confirm no pending issues.
2. Clarify tax benefit assumptions: Include a clause in the sale contract stating that the buyer acknowledges the Superbonus 110% is not guaranteed and may be revoked.
3. Consult a tax lawyer: Before finalizing a purchase, have an attorney review whether the property’s renovations meet Agenzia delle Entrate standards for habitability.
4. Document contractor communications: If the seller claims the Superbonus 110% was approved, obtain written confirmation from the contractor and the tax authority.

Where to find official updates:

• Agenzia delle Entrate – Superbonus 110% FAQ
• Italian Courts – Recent Rulings on “Aliud Pro Alio”
• Italian Notary Association – Property Sale Contract Templates

FAQ: Superbonus, Habitability, and Your Rights

Q: Can I sue if I bought a property and later found out the Superbonus 110% was revoked?
A: You may have grounds for perdita di chance (lost opportunity) compensation if the contractor’s failure directly caused the loss. However, proving “aliud pro alio” (void sale) is far harder unless the property was fraudulently misrepresented.

Q: What if the property has an agibilità certificate but isn’t truly habitable?
A: The Agenzia delle Entrate can still deny the Superbonus 110%. If you relied on this certificate to buy, consult a lawyer about potential claims.

Q: How do I check if a property’s Superbonus claim is valid?
A: Request a certificato di agibilità and cross-reference it with the Agenzia delle Entrate’s public registry of approved projects (link).

Q: Can a mortgage be voided if the Superbonus was revoked?
A: Banks may demand repayment if the property’s value drops due to uninhabitability, but the mortgage itself is not automatically voided unless the sale is rescinded under “aliud pro alio”.

Q: What’s the difference between “abitabile” and “agibile”?
A: Agibile = Municipal certification of basic habitability. Abitabile = Functionally safe and compliant with Superbonus 110% standards (often stricter).

Q: Are there any safe Superbonus deals left?
A: Experts recommend focusing on properties where:

• Renovations were completed before December 31, 2024 (final deadline for Superbonus 110%).
• The seller can provide third-party energy audits confirming compliance.
• The sale contract includes a tax benefit disclaimer.

Final Word: Proceed with Caution—or Risk Losing More Than Money

The Superbonus 110% era is ending, but its legal fallout is just beginning. For buyers, the risk of purchasing a property where the tax credit was never valid—and thus the property itself may be “aliud pro alio”—is real. For sellers, the stakes are equally high: a denied bonus could trigger buyer lawsuits, mortgage defaults, or even contract rescissions.

As Italian courts navigate this uncharted territory, one thing is clear: Due diligence is no longer optional. Whether you’re buying, selling, or financing a property tied to the Superbonus 110%, the habitability question is no longer just about tax credits—it’s about the remarkably validity of the sale.

What’s your experience with Superbonus-related property deals? Share your story in the comments—or warn others about pitfalls you encountered. Join the discussion.