The ownership of real estate in Italy triggers specific obligations, and the IMU on a second home is one of the most common. In this guide you will find a concise explanation of who is liable, the formula used to reach the tax base, a numeric example that walks through each step,
and the usual payment routes. Understanding the distinction between national rules and local choices is essential: while the law sets calculation principles, the final tax burden depends on the municipal rate decided by the municipality.
To avoid errors and unexpected bills it helps to know a few fundamental definitions. The IMU is a municipal patrimonial tax that applies to the possession of buildings, building land and agricultural land. The taxpayer is the
holder of the property right or another real right of enjoyment (for example usufruct, use or right of habitation). An empty property or a rented one remains subject to the tax; ownership, not occupancy, determines liability in the case of a second home.
Who is exempt and what counts as main residence
The law distinguishes the main residence from other properties. In general the principal dwelling is exempt from IMU, except for certain luxury
cadastral categories such as A/1, A/8 and A/9. One relevant point is that related appurtenances (for instance garages or cellars) can be exempt too, normally up to one unit per category (C/2, C/6, C/7), when they are used in connection with the main residence. A second home does not benefit from this exemption and follows the ordinary taxation regime, which means planning for a full municipal levy.
How to determine the taxable base: step-by-step
Start from the cadastral income shown in the land registry extract. That figure must be increased by 5% and then multiplied by a coefficient that depends on the cadastral group. For standard residential units in group A (excluding A/10), the multiplier is 160. The outcome of this calculation is the taxable base (base imponibile) used to compute the IMU. For building land or agricultural land the procedure differs: values based on market or specific agricultural coefficients apply, rather than the ordinary cadastral revision.
Concrete example: a second home with a cadastral income of €500 is first increased by 5% to €525; multiplying €525 by 160 produces a taxable base of €84,000. If the municipality applies an illustrative rate of 10.6 per mille (0.0106), the annual IMU due would be €84,000 × 0.0106 = €890.40. This example shows the straightforward arithmetic but also highlights the essential dependence on the municipal rate approved in the local budget resolution.
Payment methods, timing and common reductions
Payment typically happens via the unified form F24, using the codes required for local taxes and indicating the municipal code where the property sits; many municipalities also accept PagoPA or prefilled payment notices. The IMU for second homes is normally split into two installments: an advance and a balance. The advance is often calculated on the previous year’s rates, while the balance is adjusted to reflect any municipal changes for the current year. Always check the municipal council’s delibera before paying to confirm the applicable rates.
Reductions and regularization
Certain situations can reduce or eliminate the IMU: properties declared uninhabitable and certified by authorities may qualify for full exemption, and specific agreements like a comodato d’uso to direct relatives can produce a 50% reduction of the taxable base when conditions are met. Tenancies under agreed rent schemes can also attract favorable treatment. If a payment is late, the taxpayer can use ravvedimento operoso to regularize the position by paying the tax due plus interest and a reduced penalty proportional to the delay.
Practical checklist before you pay
Before making any payment confirm the following: obtain the latest cadastral income from the land registry; verify whether the property is considered a main residence or a second home; review the municipal resolution for the exact IMU rate; choose the correct payment channel (F24, PagoPA, or local notice); and, if applicable, check eligibility for reductions like comodato discounts or exemption for inagibilità. When in doubt, consult the municipal tax regulation or a qualified tax advisor to avoid mistakes.