Sismabonus for Condominiums: Tax Deduction for Seismic Risk Reduction

The sismabonus for condominiums is the Italian tax deduction designed to encourage works that reduce the seismic risk of buildings, and in condominiums it takes on features of its own compared to single family homes, both in the majorities needed to approve the works and in the pool of beneficiaries, which includes every owner in proportion to their share of the building. It is technically more complex than the energy saving ecobonus because it requires a preliminary diagnosis of the building's seismic vulnerability, carried out by a qualified professional, before the tax benefit can even be quantified.

The seismic zones covered

The sismabonus applies to works carried out on buildings located in seismic zones 1, 2 and 3, according to the national classification adopted by Italy's civil protection authority, which reflects the baseline seismic hazard of each area. Buildings in zone 4, considered to have lower seismic hazard, are generally excluded from this specific measure, subject to any exceptions the rules may provide over time. This is therefore the first thing to check before starting any technical assessment of the site.

Risk classes and deduction percentages

The sismabonus mechanism is based on moving the building up a seismic risk class, measured according to ministerial guidelines through eight classes, from A+ to G. A qualified professional certifies the risk class before the works and the class reached after the intervention: the deduction percentage granted increases with the improvement achieved, with more favorable treatment when the building moves up two or more classes rather than just one. This grading makes it necessary to design the works from the outset with a specific target class in mind.

The professional's sworn certification

The technical sworn statement is the cornerstone document of the entire procedure: a qualified engineer or architect certifies the building's seismic risk class before and after the intervention, following the methodology set out in the guidelines. Without this certification, filed with the competent local building office before the works begin within the timeframe set by the rules, the deduction is not granted. It is a step the administrator needs to plan well in advance, identifying the professional and checking their qualifications before even bringing the final project to the assembly.

The assembly resolution for the sismabonus

Seismic risk reduction works on common parts are approved by the assembly with the majorities set for extraordinary maintenance works or for innovations, depending on the specific nature of the intervention. The resolution must clearly state the scope of the works, the projected cost and the allocation among the owners, elements that will also support the subsequent tax review of the deduction's entitlement. It is advisable for the minutes to explicitly reference the anti seismic purpose of the works and the technical report of the appointed professional.

Allocating the deduction among the owners

• The deduction is granted to each owner in proportion to their share of the building or the specific allocation criteria set out in the building's regulation.
• The condominium must keep the documentation of payments made through a dedicated, tax traceable bank transfer.
• Each owner receives from the administrator the data needed to claim their share of the deduction on their own tax return.
• If the unit is sold during the deduction period, the remaining deduction can pass to the buyer unless the parties agree otherwise.

The difference from the ecobonus

The sismabonus and the ecobonus share part of the same incentive logic, but remain distinct measures: the first looks at structural safety, the second at energy savings. Some works combine both aspects, for example external wall insulation paired with structural reinforcement of the facade, and in these cases the costs attributable to each measure must be precisely separated, because the technical and documentary requirements do not coincide, even when it is the same construction site.

The administrator's role in managing the project

The administrator coordinates the timeline between design, certification, assembly resolution and execution of the works, a process that in larger buildings can stretch over several months. Keeping track of technical deadlines, traceable payments and the documentation to provide to owners is work that benefits enormously from a digital tool able to connect the construction project, the accounting and the communications in a single environment. AmministraPro offers exactly this kind of support: the features page describes the tools for managing extraordinary works and tax documentation, while the pricing section lists the plans built for firms managing condominiums with seismic renovation projects underway.