Three checks, not one
| Check | Question |
|---|---|
| Personal | Does the party incurring the expenditure hold a title giving the right to the deduction |
| Property | Is the unit the claimant's main home or another property |
| Tax | Does the claimant have sufficient tax and fall outside the limits applying to higher incomes |
The order is not immaterial. The first check establishes whether there is a claimant, the second determines the rate, the third determines whether the deduction can actually be used.
Who incurs the expenditure
The right to the deduction belongs to the party incurring the expenditure who holds a title over the property, and the field is wider than owners alone. The field also includes occupiers and certain family members.
It includes holders of rights in rem, those in occupation under an appropriate title, and in defined circumstances cohabiting family members and de facto partners of the owner or occupier. Each position requires a documented title at the date of the expenditure.
Two elements produce most of the errors.
The first is the match between who incurs the expenditure and who claims. The deduction follows the party that actually paid, and the payment record must be in the claimant's name. An invoice addressed to the owner and paid by a cohabiting son or daughter creates a situation that must be set up correctly from the outset, because it cannot be cured afterwards.
The second is the occupier's title. A tenant or a borrower under a loan for use may claim the deduction, but the title must exist and bear a certain date preceding the start of the works.
On which property
Since 2025 the use of the property determines the applicable rate, and it is the variable weighing most on the financial outcome of a project. Use should be verified against documents rather than a verbal statement.
Works on the unit used as the claimant's main home attract the enhanced rate; works on any other unit attract the ordinary rate. The difference between the two rates weighs materially on the financial plan.
The notion of main home has a precise tax meaning and does not coincide either with everyday usage of the term or with registered residence alone. Checking it precedes the estimate rather than following it.
One frequent situation deserves attention: a unit that becomes the main home once the works are complete. The classification must be assessed against the position the rules require, and its application to situations of this kind is clarified by the revenue administration's practice.
With what tax capacity
A deduction is not a grant: it reduces tax due and therefore presupposes that tax exists. Where no tax is due the deduction goes unused.
A claimant without sufficient gross tax loses the unused annual instalment, which is neither refundable nor carried forward. On a deduction spread over ten instalments, the question arises every year.
To this is added a limitation introduced recently for taxpayers with higher incomes, operating as an overall cap on deductions available and taking account of the composition of the household. The cap operates independently of tax capacity and should be checked with the adviser.
The combined effect is that two clients incurring the same expenditure on the same type of property may obtain very different actual benefits. An estimate presenting the deduction as an absolute figure without checking tax capacity is an incomplete estimate.
Common parts of a building
Works on common parts follow a logic of their own worth isolating, because it generates the greatest number of questions. The benefit is distributed by share and not in equal parts.
The expenditure is incurred by the building's owners' association but the deduction belongs to each individual owner, in proportion to their share of the building or under whatever different allocation has been resolved. A resolution can change the allocation basis.
Three practical consequences follow.
The rate is determined owner by owner, according to the use of each individual unit. In the same building, for the same works on common parts, some owners will apply the enhanced rate and others the ordinary one.
Tax capacity is likewise assessed individually, and an owner without sufficient tax loses their share without that affecting the others. The lost share is not redistributed among the other owners.
The documentation is prepared by the building manager, who certifies to each owner the share of expenditure attributable to them. The professional advising the association produces the material on which that certificate rests.
For a professional the consequence concerns communication: an estimate presented to the general meeting cannot state a single net benefit, because that benefit differs for each owner. What should be presented is the expenditure and the mechanism, not the individual outcome.
What this means for a professional
The scope of professional responsibility should be drawn clearly. The personal check belongs to the tax adviser.
The personal and tax checks belong to the client and their tax adviser. A technical professional is not required to know a client's income or the composition of their household.
The property check, by contrast, bears directly on the technical work, because the use of the unit determines the rate and therefore the financial plan of the project. It should therefore be made at the start of the appointment and documented.
The operational point that follows is one of method: an estimate is presented stating the rate applied and the assumption it rests on, and referring the question of tax capacity to the client's tax adviser. Presenting a figure net of deduction without stating those assumptions invites a challenge in an area outside technical competence.
Note: the information in this page relates to Italy and refers to the tax year stated. This area is revised by each budget law: the text in force and the revenue administration's practice should be checked before any operational use.