Mortgage Loans and Interest Rates: Cassation Court Ordinance 15104/2025 and the Normative Value of Bank of Italy Instructions

In the complex and ever-evolving landscape of banking law, transparency and the correct application of interest rate regulations in mortgage contracts are of paramount importance. Every ruling by the Supreme Court on this matter is awaited with great interest, as it helps to define the boundaries of legality and protect the interests of both credit institutions and borrowers. Ordinance No. 15104, issued on June 6, 2025, by the Court of Cassation, presided over by Dr. D. M. and rapporteur Dr. R. F. V. A., fits precisely into this context, providing essential clarifications on the value of Bank of Italy Instructions.

The Crucial Role of Bank of Italy Instructions in Mortgage Loans

The determination of the interest rate applicable to a bank mortgage contract is an issue that has generated considerable legal disputes. The Italian legislator, aware of the sensitivity of this aspect, has introduced a series of regulations over time aimed at ensuring transparency and preventing usurious practices. Among these, Legislative Decree No. 385 of 1993 (Consolidated Banking Act – TUB) and Law No. 108 of 1996, concerning usury, stand out.

Article 4 of Legislative Decree No. 385/1993 grants the Bank of Italy the power to issue general prudential supervision instructions. In parallel, Article 2, paragraph 2, of Law No. 108/1996 refers to ministerial decrees for the calculation of the average overall effective rate (TEGM), a fundamental parameter for checking usury. The central issue, often debated, concerns the nature and effectiveness of Bank of Italy Instructions: are they mere recommendations or do they possess genuine normative value?

Regarding the criteria for determining the interest rate applicable to a bank mortgage contract, the criteria established by the Bank of Italy Instructions, issued pursuant to art. 4, Legislative Decree No. 385 of 1993, have normative standing, supplementing the ministerial decrees referred to in art. 2, paragraph 2, Law No. 108 of 1996, and are therefore immediately applicable for the purpose of identifying the category of relationship applicable to the dispute.

This maxim, extracted from Ordinance No. 15104/2025, represents a significant milestone. The Supreme Court, in line with previous rulings (see No. 29794 of 2024 and No. 23866 of 2024), strongly reiterates that Bank of Italy Instructions are not mere indications but enjoy genuine "normative, supplementary standing." This means they complete and specify primary and secondary legislative provisions, becoming a binding parameter for the correct determination of interest rates on mortgages.

Their "supplementary" nature to ministerial decrees implies that, in the interpretation and application of regulations on usury and banking transparency, one cannot disregard what has been established by the Bank of Italy. This "immediate" application ensures that calculation criteria are uniform and objective, fundamental for legal certainty and the prevention of abuses.

What Does This Mean for Borrowers and Credit Institutions?

The Cassation Court's ruling has direct and significant implications for all parties involved in a bank mortgage contract. For borrowers, it strengthens their protective position, providing a clear normative reference to challenge any interest rates that do not comply with Bank of Italy Instructions. Transparency, in this context, is not just an ethical principle but a legal requirement whose violation can have significant consequences on the validity or recalculation of the mortgage.

For credit institutions, Ordinance No. 15104/2025 underscores the non-derogable obligation to comply with Bank of Italy Instructions. These are not secondary bureaucratic fulfillments but primary norms that must guide the formulation and application of contracts. Failure to observe these criteria could expose banks to litigation, as in the case examined by the Court between F. (O. V. M.) and I., which saw an appeal concerning a judgment of the Court of Appeal of Sassari of 2020 declared inadmissible, while still reaffirming the general principle.

In summary, the key points of this ruling are:

• **Legal Certainty:** Bank of Italy Instructions provide clear and binding parameters for rate determination.
• **Borrower Protection:** Consumers have a stronger legal tool to verify the correctness of applied rates.
• **Banking Transparency:** Institutions are called upon to adhere more closely to regulatory guidelines, reducing the risk of information asymmetries.

Conclusions: Towards Greater Transparency and Legal Certainty

Ordinance No. 15104 of 2025 by the Court of Cassation represents a fundamental piece in the mosaic of Italian banking law. By reaffirming the normative standing of Bank of Italy Instructions, the Court not only consolidates an existing jurisprudential trend but also strengthens the principle of transparency and fairness that must permeate relationships between banks and clients. This approach ensures greater predictability in disputes and contributes to building a fairer and more reliable financial system.

For anyone who has entered into or intends to enter into a mortgage contract, understanding these dynamics is essential. The advice of a lawyer experienced in banking law can make a difference in ensuring that one's rights are fully protected and that contractual conditions are always in compliance with the law and the most up-to-date case law.